The D-type radiator valve is widely used as a radiator valve installed at the inlets of various radiators to regulate the amount of steam or hot water.
It is also ideal as an inlet or outlet valve for fan coil units.

Features

The diaphragm packless structure and an additional O-ring provide double sealing, eliminating concerns about leaks or noise often associated with packing-type valves.
Highly durable with almost no failures, which reduces maintenance costs and ensures long-lasting performance.
Built to be simple yet sturdy, allowing for easy operation and adjustment. It can be adjusted with less than one full rotation of the handle.
The valve body uses heat-resistant synthetic rubber, preventing leaks and withstanding long-term use.
Suitable not only for steam but also for cold and hot water.

Structure & Dimensions

Specifications

Structure & Dimensions

Usage Example

Usage Example Specifications

• Suction lift: 0.8 m
• Discharge height: 0.8 m
• Water temperature: 20℃
• Discharge volume: See table on the right

Water Discharge Volume in Usage Example
(Varies depending on steam pressure)

Note: As the discharge height increases, the water discharge volume decreases.
Apply the following multipliers to the values in the above table:

At:

• 4 m discharge height: 80%
• 7 m discharge height: 70%
• 10 m discharge height: 50%

However, please refer to the table below for the maximum discharge height.

Maximum Suction Lift (see right diagram)

Discharge height: 0 m
Water temperature: Below 20℃
Steam pressure: 0.3 – 0.4 MPa
Nominal Diameter:

• 15: 3 m
  20: 5 m
  25: 6 m
  32: 6 m

Maximum Discharge Height

• Suction lift: 0 m
  Water temperature: ≤ 20℃

Features

Despite its compact size, it provides excellent silencing performance with minimal resistance.
When attached to a trap with loud discharge noise, such as a disc trap, the noise can be reduced by 15 to 20 dB (*1).
Can also be used with solenoid valves (*1).
Easy to install and requires very little space.
*Note (*1): Not suitable for equipment with continuous discharge.

Specifications

Structure and Dimensions

Usage Examples

The silencer is used to produce hot water in kitchens, bathrooms, and washrooms in offices, factories, buildings, etc.
By simply attaching it to part of the piping, noise can be significantly reduced.
Note: This product is intended for hot water systems and is not a typical silencer.

Features

Simple structure and easy to handle.
No risk of failure or damage.
Reduces noise just by being attached to part of the piping.

Specifications

Note (1): Please use the F-type silencer within the sound limit shown in the diagram on the right.

Structure and Dimensions

F Type – Dimensions & Weight

S Type – Dimensions & Weight

F-Type Silencer Nominal Diameter Selection Chart

S-Type Silencer Nominal Diameter Selection Chart

The silencer is used to produce hot water in kitchens, bathrooms, and washrooms in offices, factories, buildings, etc.
By simply attaching it to part of the piping, noise can be significantly reduced.
Note: This product is intended for hot water systems and is not a typical silencer.

Features

Simple structure and easy to handle.
No risk of failure or damage.
Reduces noise just by being attached to part of the piping.

Specifications

Note (1): Please use the F-type silencer within the sound limit shown in the diagram on the right.

Structure and Dimensions

F Type – Dimensions & Weight

S Type – Dimensions & Weight

F-Type Silencer Nominal Diameter Selection Chart

S-Type Silencer Nominal Diameter Selection Chart

This is a basic vacuum breaker with over 20 years of proven performance. It operates reliably with a simple structure.
If the piping or container becomes vacuumed and left as is, it may cause backflow or result in the container being crushed.
The RVD19-2 model quickly draws in air to break the vacuum when the piping or container is vacuumed.
Note: A check valve can be installed upstream of the RVD19-2 model to prevent backflow.

Features

Breaks vacuum quickly with a large suction volume.
Operates reliably with a very small pressure difference due to its diaphragm shape.
Maintains stable operation even under long-term pressure (up to 1 MPa) and temperature (up to 90°C).
All wetted parts are made of corrosion-resistant materials, so there is no concern about rust.
The valve body uses synthetic rubber, providing excellent sealing performance.

Specifications / Performance

Structure / Dimensions / Weight

Air Intake Volume

Usage Example

If a vacuum breaker is not installed in the diagram and, for some reason, valve A is closed, while a hose is submerged in a bucket at point B and water is drawn from a water fountain or another outlet at point C, the supply pipe may fall into negative pressure.
This can cause a reverse siphon effect, sucking water from the bucket into the drinking water system, leading to contamination.
However, if an RVD19-2 model is installed as shown in the diagram, when valve A is closed and negative pressure occurs near point B, the RVD19-2 quickly draws in air, preventing water from the bucket from being sucked into the system.

Precautions for Use

1. Do not raise the downstream piping of the vacuum breaker.
2. The vacuum breaker alone does not have a backflow prevention function. If used for backflow prevention, raise the pipe by at least 150 mm above the vacuum breaker as shown in the diagram, and install a check valve upstream of the vacuum breaker.
3. Install it in a clean location and do not insulate the air intake opening.
4. To prevent unexpected water leakage from the air intake, install it in a safe and drainable location.

Note:
If the water supply tank, etc., is filled above the inlet level, or if there is a risk of the water surface being higher than the tank, install a check valve and vacuum breaker to prevent backflow.
Also, install RVD19-2 where there is a risk of siphoning due to a sudden pressure drop.

It is a compact and low-cost automatic air release valve.

Features

When the valve is closed, the valve body is completely separated from the float, so there is no water leakage caused by pipe vibration or pulsation.
All parts are made from non-corrosive materials, so there is no concern about rust-contaminated water.
A check valve is built into the discharge side (prevents air from being drawn in even if the piping or equipment becomes negatively pressurized).
The float is made from molded synthetic resin, so there is no risk of deformation or water absorption.
Even in the event of leakage, it can be prevented by screwing a manually operated stop valve into the discharge side. This is also effective when there is no stop valve on the inlet side of the air release valve.

Specifications

Air Discharge Capacity

Structure / Dimensions

Installation Example

Please install it at the top of the piping.
If h is made as long as possible and φd as large as possible, bubble separation becomes especially easy.

Precautions When Installing

Install at the highest point of the piping or equipment, and as vertically as possible.
Attach a stop valve on the inlet side to allow for water shutoff during maintenance and inspection.
When starting water flow for the first time, close the above stop valve and flush the piping thoroughly to remove iron particles or debris so that no foreign matter enters the air release valve. Then open the stop valve fully.
There is a possibility that debris may adhere to the valve body of the air release valve and cause water leakage. Insert a vinyl tube (inner diameter 6 mm) into the outlet of the air release valve and guide the end to a drain. If leakage occurs, turn the manual shut-off valve to stop the leak.
For more details on handling, please refer to the instruction manual attached to the product.

It is ideal as an air release valve for stainless steel piping.

Features

When the valve is closed, the structure completely separates the valve body from the float, preventing water leakage due to pipe vibration or pulsation.
All parts are made from non-corrosive materials, eliminating the risk of rust-contaminated water.
Thanks to a unique design, it achieves a very high air discharge capacity despite its compact size.
The float is made of molded synthetic resin, so there is no risk of collapse or water absorption.
In the unlikely event of leakage, it can be prevented by tightening a hose clamp on the outlet side. This is also effective when the inlet of the air release valve is not sealed.
The AS40A-3F model quickly draws in a large volume of air when the piping or equipment is under negative pressure, preventing damage.
The AS40A-3CF model has a built-in check valve on the outlet side and a strainer on the inlet side, preventing air from being drawn in even if the piping or equipment is under negative pressure.

Specifications

Structure / Dimensions

Installation Example

Please install at the top of the piping in all cases.
Making h as long as possible and d as thick as possible makes bubble separation especially easy.

Precautions When Installing

Install the unit as vertically as possible at the highest point of the piping or equipment.
Attach a stop valve on the inlet side to allow for water shutoff during maintenance and inspection.
When starting the system for the first time, close the stop valve above, and thoroughly flush the piping to remove any debris and prevent foreign objects from entering the air release valve. After that, fully open the stop valve.
There is a risk that debris may stick to the valve body and cause water leakage. Therefore, insert an 8 mm inner diameter vinyl tube into the valve outlet and direct it to a drain or safe discharge point.
For further handling instructions, please read the instruction manual included with the product.

A strainer is a crucial protective device installed upstream in piping to remove iron particles, rust, debris, and other foreign substances, thereby protecting downstream equipment such as control valves and traps.
The U-type strainer is mainly used with self-operated control valves, pressure-reducing valves, and traps, and is ideal in situations where frequent cleaning of debris is required.

Specifications

Note: The pressure loss values are based on water as the fluid and a 60-mesh strainer.

Structure・Dimensions・Weight

Made entirely of stainless steel, this strainer offers excellent corrosion resistance and durability.

Specifications

Note: Threaded Y-type strainers can also be manufactured in nominal diameters 40 and 50.

Note: The pressure loss values are based on water as the fluid and a 60-mesh strainer.

Structure・Dimensions・Weight

Made entirely of stainless steel, this strainer offers excellent corrosion resistance and durability.

Specifications

Note: Threaded Y-type strainers can also be manufactured in nominal diameters 40 and 50.

Note: The pressure loss values are based on water as the fluid and a 60-mesh strainer.

Structure・Dimensions・Weight

Made entirely of stainless steel, this strainer offers excellent corrosion resistance and durability. Manufactured using the lost wax process, it features a beautiful body line and a lightweight design.

Specifications

Note:

1. Strainer mesh can also be manufactured in 20, 40, 80, or 100 mesh.
2. Nominal diameters 40 and 50 can also be manufactured.

Structure・Dimensions・Weight・Cv Value

A strainer is a vital protective device installed upstream in piping to remove iron filings, rust, debris, and other foreign matter. It protects downstream equipment such as control valves and traps.
Y-type strainers are designed to be compact, highly efficient, and cost-effective, and are mainly used with self-operated control valves, pressure-reducing valves, and traps.

Specifications

Note (1): The standard specification for the inner mesh of the strainer is 40 mesh. Mesh sizes other than 40 can also be manufactured upon request.
Note (2): Gasket V/# GF300 is the standard specification. Depending on the fluid, temperature, and pressure, the standard material may not be suitable. Please specify the gasket material when necessary.

Structure・Dimensions・Weight・Cv Value

Pressure Loss Chart

Note: There is little difference in performance for strainers with 40 mesh compared to those within the 20–100 mesh range.

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
If frequent cleaning due to heavy debris is required, use a U-type strainer (see page 235) that allows debris removal from the top.

A strainer is a critical protective device installed upstream in piping systems to remove iron filings, rust, debris, and other foreign substances. It protects downstream components such as control valves and traps.
The Y-type strainer is compact, cost-effective, and highly efficient, and is mainly used with self-operated control valves, pressure reducing valves, and traps.

Specifications

Note (1):
50A: equivalent to approx. 6.1 mesh,
65–100A: equivalent to approx. 8.5 mesh,
125–150A: equivalent to approx. 5 mesh.
Note (2):
20–50A: equivalent to approx. 10 mesh,
65–250A: equivalent to approx. 8.5 mesh.
Remark:
For JIS 10K flange type, nominal diameters 65–150A can also be manufactured with cast iron + nylon coating. For details on specifications and dimensions, please contact us.

Structure・Dimensions・Weight・Cv Value

Threaded Type: D10SY・D16SY

Dimensions, Weight, and Cv Value of D10SY and D16SY Models

Flange Type: D10YH, D10YA, D10YOH, D16Y

Dimensions, Weight, and Cv Value of D10YH, D10YA, and D10YOH

Dimensions, Weight, and Cv Value of D16Y

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
For steam Y-type strainers, the standard screen is a perforated plate, but using an inner mesh is also acceptable.
If regular cleaning is required due to heavy debris, use a U-type strainer (see page 235), which allows debris removal from the top.

A strainer is a critical protective device installed upstream in piping systems to remove iron filings, rust, debris, and other foreign substances. It protects downstream components such as control valves and traps.
The Y-type strainer is compact, cost-effective, and highly efficient, and is mainly used with self-operated control valves, pressure reducing valves, and traps.

Specifications

Note (1):
50A: equivalent to approx. 6.1 mesh,
65–100A: equivalent to approx. 8.5 mesh,
125–150A: equivalent to approx. 5 mesh.
Note (2):
20–50A: equivalent to approx. 10 mesh,
65–250A: equivalent to approx. 8.5 mesh.
Remark:
For JIS 10K flange type, nominal diameters 65–150A can also be manufactured with cast iron + nylon coating. For details on specifications and dimensions, please contact us.

Structure・Dimensions・Weight・Cv Value

Threaded Type: D10SY・D16SY

Dimensions, Weight, and Cv Value of D10SY and D16SY Models

Flange Type: D10YH, D10YA, D10YOH, D16Y

Dimensions, Weight, and Cv Value of D10YH, D10YA, and D10YOH

Dimensions, Weight, and Cv Value of D16Y

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
For steam Y-type strainers, the standard screen is a perforated plate, but using an inner mesh is also acceptable.
If regular cleaning is required due to heavy debris, use a U-type strainer (see page 235), which allows debris removal from the top.

A strainer is a critical protective device installed upstream in piping systems to remove iron filings, rust, debris, and other foreign substances. It protects downstream components such as control valves and traps.
The Y-type strainer is compact, cost-effective, and highly efficient, and is mainly used with self-operated control valves, pressure reducing valves, and traps.

Specifications

Note (1):
50A: equivalent to approx. 6.1 mesh,
65–100A: equivalent to approx. 8.5 mesh,
125–150A: equivalent to approx. 5 mesh.
Note (2):
20–50A: equivalent to approx. 10 mesh,
65–250A: equivalent to approx. 8.5 mesh.
Remark:
For JIS 10K flange type, nominal diameters 65–150A can also be manufactured with cast iron + nylon coating. For details on specifications and dimensions, please contact us.

Structure・Dimensions・Weight・Cv Value

Threaded Type: D10SY・D16SY

Dimensions, Weight, and Cv Value of D10SY and D16SY Models

Flange Type: D10YH, D10YA, D10YOH, D16Y

Dimensions, Weight, and Cv Value of D10YH, D10YA, and D10YOH

Dimensions, Weight, and Cv Value of D16Y

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
For steam Y-type strainers, the standard screen is a perforated plate, but using an inner mesh is also acceptable.
If regular cleaning is required due to heavy debris, use a U-type strainer (see page 235), which allows debris removal from the top.

A strainer is a critical protective device installed upstream in piping systems to remove iron filings, rust, debris, and other foreign substances. It protects downstream components such as control valves and traps.
The Y-type strainer is compact, cost-effective, and highly efficient, and is mainly used with self-operated control valves, pressure reducing valves, and traps.

Specifications

Note (1):
50A: equivalent to approx. 6.1 mesh,
65–100A: equivalent to approx. 8.5 mesh,
125–150A: equivalent to approx. 5 mesh.
Note (2):
20–50A: equivalent to approx. 10 mesh,
65–250A: equivalent to approx. 8.5 mesh.
Remark:
For JIS 10K flange type, nominal diameters 65–150A can also be manufactured with cast iron + nylon coating. For details on specifications and dimensions, please contact us.

Structure・Dimensions・Weight・Cv Value

Threaded Type: D10SY・D16SY

Dimensions, Weight, and Cv Value of D10SY and D16SY Models

Flange Type: D10YH, D10YA, D10YOH, D16Y

Dimensions, Weight, and Cv Value of D10YH, D10YA, and D10YOH

Dimensions, Weight, and Cv Value of D16Y

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
For steam Y-type strainers, the standard screen is a perforated plate, but using an inner mesh is also acceptable.
If regular cleaning is required due to heavy debris, use a U-type strainer (see page 235), which allows debris removal from the top.

A strainer is a critical protective device installed upstream in piping systems to remove iron filings, rust, debris, and other foreign substances. It protects downstream components such as control valves and traps.
The Y-type strainer is compact, cost-effective, and highly efficient, and is mainly used with self-operated control valves, pressure reducing valves, and traps.

Specifications

Note (1):
50A: equivalent to approx. 6.1 mesh,
65–100A: equivalent to approx. 8.5 mesh,
125–150A: equivalent to approx. 5 mesh.
Note (2):
20–50A: equivalent to approx. 10 mesh,
65–250A: equivalent to approx. 8.5 mesh.
Remark:
For JIS 10K flange type, nominal diameters 65–150A can also be manufactured with cast iron + nylon coating. For details on specifications and dimensions, please contact us.

Structure・Dimensions・Weight・Cv Value

Threaded Type: D10SY・D16SY

Dimensions, Weight, and Cv Value of D10SY and D16SY Models

Flange Type: D10YH, D10YA, D10YOH, D16Y

Dimensions, Weight, and Cv Value of D10YH, D10YA, and D10YOH

Dimensions, Weight, and Cv Value of D16Y

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
For steam Y-type strainers, the standard screen is a perforated plate, but using an inner mesh is also acceptable.
If regular cleaning is required due to heavy debris, use a U-type strainer (see page 235), which allows debris removal from the top.

A strainer is a critical protective device installed upstream in piping systems to remove iron filings, rust, debris, and other foreign substances. It protects downstream components such as control valves and traps.
The Y-type strainer is compact, cost-effective, and highly efficient, and is mainly used with self-operated control valves, pressure reducing valves, and traps.

Specifications

Note (1):
50A: equivalent to approx. 6.1 mesh,
65–100A: equivalent to approx. 8.5 mesh,
125–150A: equivalent to approx. 5 mesh.
Note (2):
20–50A: equivalent to approx. 10 mesh,
65–250A: equivalent to approx. 8.5 mesh.
Remark:
For JIS 10K flange type, nominal diameters 65–150A can also be manufactured with cast iron + nylon coating. For details on specifications and dimensions, please contact us.

Structure・Dimensions・Weight・Cv Value

Threaded Type: D10SY・D16SY

Dimensions, Weight, and Cv Value of D10SY and D16SY Models

Flange Type: D10YH, D10YA, D10YOH, D16Y

Dimensions, Weight, and Cv Value of D10YH, D10YA, and D10YOH

Dimensions, Weight, and Cv Value of D16Y

Conditions for Selection

Select a strainer with the same nominal diameter as the piping.
For steam Y-type strainers, the standard screen is a perforated plate, but using an inner mesh is also acceptable.
If regular cleaning is required due to heavy debris, use a U-type strainer (see page 235), which allows debris removal from the top.

The LCD-type liquid level control valve automatically adjusts the water level in towers, tanks, and boilers by adding or reducing feed water and drain. Despite not using any auxiliary power sources such as electricity or air, it is widely used and highly regarded for its excellent control performance.

Features

The float (detection part) and the valve (control part) are directly connected, and the simple structure allows for direct mounting to a tank, making handling easy and offering excellent durability.
Performs precise and responsive water level adjustment without requiring auxiliary power, which is often a cause of malfunction.
Uses a valve structure without packing, which can cause friction or leakage, enabling reliable performance even with small manual operation force, without auxiliary power.
By removing the inspection hole plug, the internal mechanism can be inspected while the unit remains installed on the tower, tank, or boiler.

Specifications and Performance

Note: We also manufacture valve bodies and main units made of cast iron with nylon coating and stainless-clad steel.

Outlet Type: When the liquid level in the tank rises, the valve opens (float rises) and discharges fluid outside the tank to maintain a constant liquid level.
Inlet Type: When the liquid level in the tank falls, the valve opens (float lowers) and supplies fluid into the tank to maintain a constant liquid level.

Maximum Allowable Differential Pressure / Cv

Dimensions & Weight

Installation Example

Note: The assembly orientation of the float chamber and valve box in the diagram differs from the photo shown above.

Structure

Operation

• The system consists of three main parts: a float and body that detect the water level, a lever mechanism that transmits the float movement to the valve as operating force, and a valve box that adjusts the outflow/inflow based on changes in the water level.
• A standard lever is used to control outflow, while a reverse lever is used to control inflow.
• In the outlet type, when the water level rises, the float and lever rise, opening the valve with the standard lever, which increases the outflow and acts to lower the water level. When the water level falls, the valve closes, reducing outflow and acting to prevent further decrease in water level.
• In the inlet type, when the water level falls, the float and lever lower, opening the valve with the reverse lever, which increases inflow and acts to raise the water level. When the water level rises, the valve closes, reducing inflow and preventing the water level from rising further.

Reference Water Level A

The relationship between the reference water level A and the differential pressure before and after the valve is as shown in the following diagram.

Notes When Selecting

• The liquid level control valve should not be oversized or undersized. Proper results cannot be obtained if it is not correctly sized. Please calculate the Cv value and select the appropriate nominal diameter.
• LCD-type liquid level control valves will not operate properly if the differential pressure before and after the valve is too large due to their self-operated design.
• The Cv value is calculated based on pressure loss through the valve, but actual conditions may differ. Please consider the purpose of the liquid, pressure, viscosity, and allowable pressure loss based on piping diameter, pipe length, and pump capacity.
• There are two types of control methods: inlet control and outlet control. The internal structure and components are the same, and by changing the assembly method, either method can be used. For safety and long-term reliability, please select the appropriate method based on system design.

Notes When Making Inquiries

When inquiring about liquid level control valves, please provide the following information:

1. Control method — will it control inlet or outlet flow?
2. Purpose of the valve and the liquid used.
3. Valve body type (LCD2 or LCD3), installation position, temperature (maximum, normal, minimum), and viscosity.
4. Maximum allowable pressure loss at full open.
5. Rated flow rate and minimum controllable flow rate.
6. Materials that come in contact with the fluid (valve body, float, lever, plug, etc.).
7. Connection specifications.
8. Any other special requirements.

Level switches are used in power plants, geothermal plants, etc., to send level adjustment signals and/or warning signals for high-temperature, high-pressure vessels.

Installation Example

Operation

Standard Specifications of Main Unit and Float

Note:

1. Based on JIS C 0920-1993.
2. A switch type number is entered in the circle or square on the model. For ○, enter 3 or 4. For □, enter 6 or 8.
3. Type 3 uses one SPDT micro switch. Type 4 uses two. Type 6 uses two micro switches (one at each of the two upper and lower stages of the switch mechanism). Type 8 uses two micro switches at both upper and lower two stages.
4. Usable even with specific gravity above 0.8.
5. Maximum operating temperature indicates the temperature of the liquid.
6. SLDI and SLDH types are also available with flange connection.

Operating Fluid Pressure and Temperature Range for Each Level Switch

A switch model number is inserted into the ○ and □ symbols in the model name.
For ○, it will be 3 or 4; for □, it will be 6 or 8.
For △△, depending on the switch’s ambient temperature, the following codes will be used:
SA, MA, HA, MAR, HAR (for AC use), SD, MD (for DC use).

Note: For conditions of 2.0 MPa and 215°C or less, SLG ○△△ type is the standard.

Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature

This table shows cases for drip-proof and waterproof switch housings.

Note:

1. In the model name, SA indicates a switch for normal temperature, MA for medium temperature, and HA for high temperature.
2. For DC use, please read SA as SD and MA as MD.

External Float Type Dimensions

Note: For dimensions H and C, please refer to the switch housing.

Internal Float Type Dimensions

Dimensions of Switch Housing

Drip-proof type

● Drip-proof type (This is the standard type)
(For indoor use) In accordance with JIS C 0920-1993.
…When properly installed, the unit can withstand continuous water spray from all directions within 180 degrees from vertical for 10 minutes without allowing water ingress that would interfere with normal internal operation.

Waterpro of type

● Waterproof type (For outdoor use)
In accordance with JIS C 0920-1993.
…When properly installed, the structure can withstand water sprayed continuously for 15 minutes from all directions using a nozzle with an inner diameter of 12.5 mm and a water head of 10 meters, without any signs of water ingress inside.

Note: In the model name, ○ indicates 3 or 4, and □ indicates 6 or 8.

Switch Mechanism Ratings

SA, MA, and HA use AC micro switches. (They can also be used for DC.)
For high-capacity DC use, there are SD and MD.
Note that a DC switch mechanism corresponding to HA is not manufactured.

Note (1): This temperature indicates the temperature applied to the switch. It is not the fluid temperature.
(2): Can be used with AC (alternating current) under the same electrical rating as DC (direct current).

Selection of Switch Mechanism

The switch uses a micro switch.

Selection Based on Fluid Temperature and Ambient Temperature

Select by considering the heat resistance of the micro switch.
Please refer to page 251 for “Operating Fluid Pressure and Fluid Temperature Range for Each Level Switch” and “Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature”.
(Note: For SLL, SLS, and SLN types, only SA and MA are applicable.)
The specifications of the switch mechanism vary depending on the maximum operating temperature (heat resistance).
Please refer to page 253 for “Specifications of Switch Mechanism”.

Model Selection

Selection Example
Specification:
For indoor use, mounted on a tank.
Liquid level, upper limit alarm, pump stop.
Pressure: 0.2MPa, Temperature: 214°C, Specific gravity of liquid: 0.85, Ambient temperature: Normal

1. Based on mounting method (e.g., ball float type), pressure, temperature, specific gravity check → Refer to page 251 “Specifications” and “Operating Pressure and Fluid Temperature Range for Each Level Switch” → SLG
2. Required switch mechanism → Refer to page 254 “Switch Mechanism Selection” → 2-contact type → 4
3. Switch heat resistance → Refer to page 251 “Selection of Switch Mechanism Based on Fluid and Ambient Temperature” → MAR
4. Mounting location is indoors → switch housing type is drip-proof.
   Thus, the model becomes: SLG4MAR Drip-proof Type

Level switches are used in power plants, geothermal plants, etc., to send level adjustment signals and/or warning signals for high-temperature, high-pressure vessels.

Installation Example

Operation

Standard Specifications of Main Unit and Float

Note:

1. Based on JIS C 0920-1993.
2. A switch type number is entered in the circle or square on the model. For ○, enter 3 or 4. For □, enter 6 or 8.
3. Type 3 uses one SPDT micro switch. Type 4 uses two. Type 6 uses two micro switches (one at each of the two upper and lower stages of the switch mechanism). Type 8 uses two micro switches at both upper and lower two stages.
4. Usable even with specific gravity above 0.8.
5. Maximum operating temperature indicates the temperature of the liquid.
6. SLDI and SLDH types are also available with flange connection.

Operating Fluid Pressure and Temperature Range for Each Level Switch

A switch model number is inserted into the ○ and □ symbols in the model name.
For ○, it will be 3 or 4; for □, it will be 6 or 8.
For △△, depending on the switch’s ambient temperature, the following codes will be used:
SA, MA, HA, MAR, HAR (for AC use), SD, MD (for DC use).

Note: For conditions of 2.0 MPa and 215°C or less, SLG ○△△ type is the standard.

Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature

This table shows cases for drip-proof and waterproof switch housings.

Note:

1. In the model name, SA indicates a switch for normal temperature, MA for medium temperature, and HA for high temperature.
2. For DC use, please read SA as SD and MA as MD.

External Float Type Dimensions

Note: For dimensions H and C, please refer to the switch housing.

Internal Float Type Dimensions

Dimensions of Switch Housing

Drip-proof type

● Drip-proof type (This is the standard type)
(For indoor use) In accordance with JIS C 0920-1993.
…When properly installed, the unit can withstand continuous water spray from all directions within 180 degrees from vertical for 10 minutes without allowing water ingress that would interfere with normal internal operation.

Waterpro of type

● Waterproof type (For outdoor use)
In accordance with JIS C 0920-1993.
…When properly installed, the structure can withstand water sprayed continuously for 15 minutes from all directions using a nozzle with an inner diameter of 12.5 mm and a water head of 10 meters, without any signs of water ingress inside.

Note: In the model name, ○ indicates 3 or 4, and □ indicates 6 or 8.

Switch Mechanism Ratings

SA, MA, and HA use AC micro switches. (They can also be used for DC.)
For high-capacity DC use, there are SD and MD.
Note that a DC switch mechanism corresponding to HA is not manufactured.

Note (1): This temperature indicates the temperature applied to the switch. It is not the fluid temperature.
(2): Can be used with AC (alternating current) under the same electrical rating as DC (direct current).

Selection of Switch Mechanism

The switch uses a micro switch.

Selection Based on Fluid Temperature and Ambient Temperature

Select by considering the heat resistance of the micro switch.
Please refer to page 251 for “Operating Fluid Pressure and Fluid Temperature Range for Each Level Switch” and “Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature”.
(Note: For SLL, SLS, and SLN types, only SA and MA are applicable.)
The specifications of the switch mechanism vary depending on the maximum operating temperature (heat resistance).
Please refer to page 253 for “Specifications of Switch Mechanism”.

Model Selection

Selection Example
Specification:
For indoor use, mounted on a tank.
Liquid level, upper limit alarm, pump stop.
Pressure: 0.2MPa, Temperature: 214°C, Specific gravity of liquid: 0.85, Ambient temperature: Normal

1. Based on mounting method (e.g., ball float type), pressure, temperature, specific gravity check → Refer to page 251 “Specifications” and “Operating Pressure and Fluid Temperature Range for Each Level Switch” → SLG
2. Required switch mechanism → Refer to page 254 “Switch Mechanism Selection” → 2-contact type → 4
3. Switch heat resistance → Refer to page 251 “Selection of Switch Mechanism Based on Fluid and Ambient Temperature” → MAR
4. Mounting location is indoors → switch housing type is drip-proof.
   Thus, the model becomes: SLG4MAR Drip-proof Type

Level switches are used in power plants, geothermal plants, etc., to send level adjustment signals and/or warning signals for high-temperature, high-pressure vessels.

Installation Example

Operation

Standard Specifications of Main Unit and Float

Note:

1. Based on JIS C 0920-1993.
2. A switch type number is entered in the circle or square on the model. For ○, enter 3 or 4. For □, enter 6 or 8.
3. Type 3 uses one SPDT micro switch. Type 4 uses two. Type 6 uses two micro switches (one at each of the two upper and lower stages of the switch mechanism). Type 8 uses two micro switches at both upper and lower two stages.
4. Usable even with specific gravity above 0.8.
5. Maximum operating temperature indicates the temperature of the liquid.
6. SLDI and SLDH types are also available with flange connection.

Operating Fluid Pressure and Temperature Range for Each Level Switch

A switch model number is inserted into the ○ and □ symbols in the model name.
For ○, it will be 3 or 4; for □, it will be 6 or 8.
For △△, depending on the switch’s ambient temperature, the following codes will be used:
SA, MA, HA, MAR, HAR (for AC use), SD, MD (for DC use).

Note: For conditions of 2.0 MPa and 215°C or less, SLG ○△△ type is the standard.

Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature

This table shows cases for drip-proof and waterproof switch housings.

Note:

1. In the model name, SA indicates a switch for normal temperature, MA for medium temperature, and HA for high temperature.
2. For DC use, please read SA as SD and MA as MD.

External Float Type Dimensions

Note: For dimensions H and C, please refer to the switch housing.

Internal Float Type Dimensions

Dimensions of Switch Housing

Drip-proof type

● Drip-proof type (This is the standard type)
(For indoor use) In accordance with JIS C 0920-1993.
…When properly installed, the unit can withstand continuous water spray from all directions within 180 degrees from vertical for 10 minutes without allowing water ingress that would interfere with normal internal operation.

Waterpro of type

● Waterproof type (For outdoor use)
In accordance with JIS C 0920-1993.
…When properly installed, the structure can withstand water sprayed continuously for 15 minutes from all directions using a nozzle with an inner diameter of 12.5 mm and a water head of 10 meters, without any signs of water ingress inside.

Note: In the model name, ○ indicates 3 or 4, and □ indicates 6 or 8.

Switch Mechanism Ratings

SA, MA, and HA use AC micro switches. (They can also be used for DC.)
For high-capacity DC use, there are SD and MD.
Note that a DC switch mechanism corresponding to HA is not manufactured.

Note (1): This temperature indicates the temperature applied to the switch. It is not the fluid temperature.
(2): Can be used with AC (alternating current) under the same electrical rating as DC (direct current).

Selection of Switch Mechanism

The switch uses a micro switch.

Selection Based on Fluid Temperature and Ambient Temperature

Select by considering the heat resistance of the micro switch.
Please refer to page 251 for “Operating Fluid Pressure and Fluid Temperature Range for Each Level Switch” and “Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature”.
(Note: For SLL, SLS, and SLN types, only SA and MA are applicable.)
The specifications of the switch mechanism vary depending on the maximum operating temperature (heat resistance).
Please refer to page 253 for “Specifications of Switch Mechanism”.

Model Selection

Selection Example
Specification:
For indoor use, mounted on a tank.
Liquid level, upper limit alarm, pump stop.
Pressure: 0.2MPa, Temperature: 214°C, Specific gravity of liquid: 0.85, Ambient temperature: Normal

1. Based on mounting method (e.g., ball float type), pressure, temperature, specific gravity check → Refer to page 251 “Specifications” and “Operating Pressure and Fluid Temperature Range for Each Level Switch” → SLG
2. Required switch mechanism → Refer to page 254 “Switch Mechanism Selection” → 2-contact type → 4
3. Switch heat resistance → Refer to page 251 “Selection of Switch Mechanism Based on Fluid and Ambient Temperature” → MAR
4. Mounting location is indoors → switch housing type is drip-proof.
   Thus, the model becomes: SLG4MAR Drip-proof Type

Level switches are used in power plants, geothermal plants, etc., to send level adjustment signals and/or warning signals for high-temperature, high-pressure vessels.

Installation Example

Operation

Standard Specifications of Main Unit and Float

Note:

1. Based on JIS C 0920-1993.
2. A switch type number is entered in the circle or square on the model. For ○, enter 3 or 4. For □, enter 6 or 8.
3. Type 3 uses one SPDT micro switch. Type 4 uses two. Type 6 uses two micro switches (one at each of the two upper and lower stages of the switch mechanism). Type 8 uses two micro switches at both upper and lower two stages.
4. Usable even with specific gravity above 0.8.
5. Maximum operating temperature indicates the temperature of the liquid.
6. SLDI and SLDH types are also available with flange connection.

Operating Fluid Pressure and Temperature Range for Each Level Switch

A switch model number is inserted into the ○ and □ symbols in the model name.
For ○, it will be 3 or 4; for □, it will be 6 or 8.
For △△, depending on the switch’s ambient temperature, the following codes will be used:
SA, MA, HA, MAR, HAR (for AC use), SD, MD (for DC use).

Note: For conditions of 2.0 MPa and 215°C or less, SLG ○△△ type is the standard.

Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature

This table shows cases for drip-proof and waterproof switch housings.

Note:

1. In the model name, SA indicates a switch for normal temperature, MA for medium temperature, and HA for high temperature.
2. For DC use, please read SA as SD and MA as MD.

External Float Type Dimensions

Note: For dimensions H and C, please refer to the switch housing.

Internal Float Type Dimensions

Dimensions of Switch Housing

Drip-proof type

● Drip-proof type (This is the standard type)
(For indoor use) In accordance with JIS C 0920-1993.
…When properly installed, the unit can withstand continuous water spray from all directions within 180 degrees from vertical for 10 minutes without allowing water ingress that would interfere with normal internal operation.

Waterpro of type

● Waterproof type (For outdoor use)
In accordance with JIS C 0920-1993.
…When properly installed, the structure can withstand water sprayed continuously for 15 minutes from all directions using a nozzle with an inner diameter of 12.5 mm and a water head of 10 meters, without any signs of water ingress inside.

Note: In the model name, ○ indicates 3 or 4, and □ indicates 6 or 8.

Switch Mechanism Ratings

SA, MA, and HA use AC micro switches. (They can also be used for DC.)
For high-capacity DC use, there are SD and MD.
Note that a DC switch mechanism corresponding to HA is not manufactured.

Note (1): This temperature indicates the temperature applied to the switch. It is not the fluid temperature.
(2): Can be used with AC (alternating current) under the same electrical rating as DC (direct current).

Selection of Switch Mechanism

The switch uses a micro switch.

Selection Based on Fluid Temperature and Ambient Temperature

Select by considering the heat resistance of the micro switch.
Please refer to page 251 for “Operating Fluid Pressure and Fluid Temperature Range for Each Level Switch” and “Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature”.
(Note: For SLL, SLS, and SLN types, only SA and MA are applicable.)
The specifications of the switch mechanism vary depending on the maximum operating temperature (heat resistance).
Please refer to page 253 for “Specifications of Switch Mechanism”.

Model Selection

Selection Example
Specification:
For indoor use, mounted on a tank.
Liquid level, upper limit alarm, pump stop.
Pressure: 0.2MPa, Temperature: 214°C, Specific gravity of liquid: 0.85, Ambient temperature: Normal

1. Based on mounting method (e.g., ball float type), pressure, temperature, specific gravity check → Refer to page 251 “Specifications” and “Operating Pressure and Fluid Temperature Range for Each Level Switch” → SLG
2. Required switch mechanism → Refer to page 254 “Switch Mechanism Selection” → 2-contact type → 4
3. Switch heat resistance → Refer to page 251 “Selection of Switch Mechanism Based on Fluid and Ambient Temperature” → MAR
4. Mounting location is indoors → switch housing type is drip-proof.
   Thus, the model becomes: SLG4MAR Drip-proof Type

Level switches are used in power plants, geothermal plants, etc., to send level adjustment signals and/or warning signals for high-temperature, high-pressure vessels.

Installation Example

Operation

Standard Specifications of Main Unit and Float

Note:

1. Based on JIS C 0920-1993.
2. A switch type number is entered in the circle or square on the model. For ○, enter 3 or 4. For □, enter 6 or 8.
3. Type 3 uses one SPDT micro switch. Type 4 uses two. Type 6 uses two micro switches (one at each of the two upper and lower stages of the switch mechanism). Type 8 uses two micro switches at both upper and lower two stages.
4. Usable even with specific gravity above 0.8.
5. Maximum operating temperature indicates the temperature of the liquid.
6. SLDI and SLDH types are also available with flange connection.

Operating Fluid Pressure and Temperature Range for Each Level Switch

A switch model number is inserted into the ○ and □ symbols in the model name.
For ○, it will be 3 or 4; for □, it will be 6 or 8.
For △△, depending on the switch’s ambient temperature, the following codes will be used:
SA, MA, HA, MAR, HAR (for AC use), SD, MD (for DC use).

Note: For conditions of 2.0 MPa and 215°C or less, SLG ○△△ type is the standard.

Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature

This table shows cases for drip-proof and waterproof switch housings.

Note:

1. In the model name, SA indicates a switch for normal temperature, MA for medium temperature, and HA for high temperature.
2. For DC use, please read SA as SD and MA as MD.

External Float Type Dimensions

Note: For dimensions H and C, please refer to the switch housing.

Internal Float Type Dimensions

Dimensions of Switch Housing

Drip-proof type

● Drip-proof type (This is the standard type)
(For indoor use) In accordance with JIS C 0920-1993.
…When properly installed, the unit can withstand continuous water spray from all directions within 180 degrees from vertical for 10 minutes without allowing water ingress that would interfere with normal internal operation.

Waterpro of type

● Waterproof type (For outdoor use)
In accordance with JIS C 0920-1993.
…When properly installed, the structure can withstand water sprayed continuously for 15 minutes from all directions using a nozzle with an inner diameter of 12.5 mm and a water head of 10 meters, without any signs of water ingress inside.

Note: In the model name, ○ indicates 3 or 4, and □ indicates 6 or 8.

Switch Mechanism Ratings

SA, MA, and HA use AC micro switches. (They can also be used for DC.)
For high-capacity DC use, there are SD and MD.
Note that a DC switch mechanism corresponding to HA is not manufactured.

Note (1): This temperature indicates the temperature applied to the switch. It is not the fluid temperature.
(2): Can be used with AC (alternating current) under the same electrical rating as DC (direct current).

Selection of Switch Mechanism

The switch uses a micro switch.

Selection Based on Fluid Temperature and Ambient Temperature

Select by considering the heat resistance of the micro switch.
Please refer to page 251 for “Operating Fluid Pressure and Fluid Temperature Range for Each Level Switch” and “Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature”.
(Note: For SLL, SLS, and SLN types, only SA and MA are applicable.)
The specifications of the switch mechanism vary depending on the maximum operating temperature (heat resistance).
Please refer to page 253 for “Specifications of Switch Mechanism”.

Model Selection

Selection Example
Specification:
For indoor use, mounted on a tank.
Liquid level, upper limit alarm, pump stop.
Pressure: 0.2MPa, Temperature: 214°C, Specific gravity of liquid: 0.85, Ambient temperature: Normal

1. Based on mounting method (e.g., ball float type), pressure, temperature, specific gravity check → Refer to page 251 “Specifications” and “Operating Pressure and Fluid Temperature Range for Each Level Switch” → SLG
2. Required switch mechanism → Refer to page 254 “Switch Mechanism Selection” → 2-contact type → 4
3. Switch heat resistance → Refer to page 251 “Selection of Switch Mechanism Based on Fluid and Ambient Temperature” → MAR
4. Mounting location is indoors → switch housing type is drip-proof.
   Thus, the model becomes: SLG4MAR Drip-proof Type

Level switches are used in power plants, geothermal plants, etc., to send level adjustment signals and/or warning signals for high-temperature, high-pressure vessels.

Installation Example

Operation

Standard Specifications of Main Unit and Float

Note:

1. Based on JIS C 0920-1993.
2. A switch type number is entered in the circle or square on the model. For ○, enter 3 or 4. For □, enter 6 or 8.
3. Type 3 uses one SPDT micro switch. Type 4 uses two. Type 6 uses two micro switches (one at each of the two upper and lower stages of the switch mechanism). Type 8 uses two micro switches at both upper and lower two stages.
4. Usable even with specific gravity above 0.8.
5. Maximum operating temperature indicates the temperature of the liquid.
6. SLDI and SLDH types are also available with flange connection.

Operating Fluid Pressure and Temperature Range for Each Level Switch

A switch model number is inserted into the ○ and □ symbols in the model name.
For ○, it will be 3 or 4; for □, it will be 6 or 8.
For △△, depending on the switch’s ambient temperature, the following codes will be used:
SA, MA, HA, MAR, HAR (for AC use), SD, MD (for DC use).

Note: For conditions of 2.0 MPa and 215°C or less, SLG ○△△ type is the standard.

Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature

This table shows cases for drip-proof and waterproof switch housings.

Note:

1. In the model name, SA indicates a switch for normal temperature, MA for medium temperature, and HA for high temperature.
2. For DC use, please read SA as SD and MA as MD.

External Float Type Dimensions

Note: For dimensions H and C, please refer to the switch housing.

Internal Float Type Dimensions

Dimensions of Switch Housing

Drip-proof type

● Drip-proof type (This is the standard type)
(For indoor use) In accordance with JIS C 0920-1993.
…When properly installed, the unit can withstand continuous water spray from all directions within 180 degrees from vertical for 10 minutes without allowing water ingress that would interfere with normal internal operation.

Waterpro of type

● Waterproof type (For outdoor use)
In accordance with JIS C 0920-1993.
…When properly installed, the structure can withstand water sprayed continuously for 15 minutes from all directions using a nozzle with an inner diameter of 12.5 mm and a water head of 10 meters, without any signs of water ingress inside.

Note: In the model name, ○ indicates 3 or 4, and □ indicates 6 or 8.

Switch Mechanism Ratings

SA, MA, and HA use AC micro switches. (They can also be used for DC.)
For high-capacity DC use, there are SD and MD.
Note that a DC switch mechanism corresponding to HA is not manufactured.

Note (1): This temperature indicates the temperature applied to the switch. It is not the fluid temperature.
(2): Can be used with AC (alternating current) under the same electrical rating as DC (direct current).

Selection of Switch Mechanism

The switch uses a micro switch.

Selection Based on Fluid Temperature and Ambient Temperature

Select by considering the heat resistance of the micro switch.
Please refer to page 251 for “Operating Fluid Pressure and Fluid Temperature Range for Each Level Switch” and “Selection of Switch Mechanism Based on Fluid Temperature and Ambient Temperature”.
(Note: For SLL, SLS, and SLN types, only SA and MA are applicable.)
The specifications of the switch mechanism vary depending on the maximum operating temperature (heat resistance).
Please refer to page 253 for “Specifications of Switch Mechanism”.

Model Selection

Selection Example
Specification:
For indoor use, mounted on a tank.
Liquid level, upper limit alarm, pump stop.
Pressure: 0.2MPa, Temperature: 214°C, Specific gravity of liquid: 0.85, Ambient temperature: Normal

1. Based on mounting method (e.g., ball float type), pressure, temperature, specific gravity check → Refer to page 251 “Specifications” and “Operating Pressure and Fluid Temperature Range for Each Level Switch” → SLG
2. Required switch mechanism → Refer to page 254 “Switch Mechanism Selection” → 2-contact type → 4
3. Switch heat resistance → Refer to page 251 “Selection of Switch Mechanism Based on Fluid and Ambient Temperature” → MAR
4. Mounting location is indoors → switch housing type is drip-proof.
   Thus, the model becomes: SLG4MAR Drip-proof Type

Compact and lightweight — installation orientation is optional.

Features

• Installation direction is optional
   It can be mounted vertically, horizontally, or on sloped piping, making it highly convenient.
• Quick-closing valve
   The valve closes quickly before backflow occurs, thanks to a structure that applies closing force with a spring.
• Opens at low differential pressure
   Opens at a low differential pressure of 1.5–2.0 kPa.
• Lightweight and compact
• Minimal seat leakage
   Leakage is extremely minimal.

Specifications

Note (¹): Not suitable for use with water as the fluid.

Structure and Dimensions

Operation

When fluid flows, the pressure pushes the valve open.
When the fluid flow stops, the spring’s closing force activates, and the valve closes before backflow can occur.

Pressure Loss

• The graph lines represent fluid with a specific gravity of 1 at 20°C.
• To calculate the pressure loss for other fluids, use the following formula to determine the equivalent water flow rate, then refer to the graph:
    Vw = V × ρ / 1000
    Vw: Equivalent water flow rate (ℓ/s or m³/h)
    ρ: Fluid density (operating) (kg/m³)
    V: Actual flow rate (operating) (ℓ/s or m³/h)
• The graph is based on horizontal piping.
• In vertical piping, there may be slight differences before the valve is fully open. Once fully open (normal flow condition), the behavior is the same as in horizontal piping.

Note (²):
When pressure loss ΔP is 5 kPa or lower, chattering may occur, so please do not use under such conditions.

Wafer type, compact, and lightweight — installation orientation is optional.
We also manufacture valve bodies in stainless cast steel (RK16A type). (Note: Cv values and pressure loss may differ slightly.)

Specifications