Manufacturer:  Fushiman Co.,LTD.
Model: PMD31P/LP And PLG61-2P

PMD31P Type Pressure Reducing Valve for Gas

Model	Nominal Diameter	Primary Pressure	Secondary Pressure Range	Max Operating Temperature	Main Body Material	Connection
PMD31P	15～100	MAX. 1.0MPa	0.035～0.7MPa	80℃	FC	Flange

PMD31LP Type Pressure Reducing Valve for Gas

Model	Nominal Diameter	Primary Pressure	Secondary Pressure Range	Max Operating Temperature	Main Body Material	Connection
PMD31LP	15～100	MAX. 0.4MPa	0.01～0.05MPa	80℃	FC	Flange

PLG61-2P Type Pressure Reducing Valve for Gas

Model	Nominal Diameter	Primary Pressure	Secondary Pressure Range	Max Operating Temperature	Main Body Material	Connection
PLG61-2P	15～50	MAX. 400kPa	0.5～20kPa	80℃	FC	Flange

PMD31P Type Pressure Reducing Valve for Liquid Use

Model	Nominal Diameter	Primary Pressure	Secondary Pressure Range	Max Operating Temperature	Main Body Material	Connection
PMD31P	15〜100	MAX. 1.0MPa	0.035～0.7MPa	80℃	FC	Flange

New Product

• Maintains the characteristics of a self-operated pressure reducing valve that responds sensitively and accurately to load fluctuations while achieving an offset comparable to other valves.
• Compared to conventional models, it offers an increase in nominal flow rate (Cv value) (our company’s product). However, considering pipeline flow velocity, the Cv value remains the same as conventional products with the same nominal diameter.
• Can be installed on existing valves, allowing for easy performance improvement.
• Useful when replacing self-operated valves in large-scale systems while maintaining adjustment accuracy.
• Can also be used for applications such as back pressure and steam control in vacuum and low-pressure pressure reducing valves.

The hybrid pressure reducing valve achieves control precision comparable to other valves by simply adding an innovative pilot controller to a conventional self-operated pressure reducing valve.

In conventional self-operated pressure reducing valves, achieving both minimal offset and high adjustment accuracy can be challenging. Additionally, when pressure reduction through self-operated control becomes complex, or when simplified installation with highly precise pressure reduction is desired, the hybrid pressure reducing valve is the optimal solution.

1. Type of Equipment

1.1 Hybrid Pressure Reducing Valve

1.2 CP1 Model Pilot Controller (PC)

2. Operation Explanation

1. The Hybrid (HB) Pressure Reducing Valve consists of two components: the main valve, which controls pressure, and the pilot controller (PC), which adjusts the control fluid based on changes in secondary pressure. The pilot controller is supplied with a control fluid such as compressed air, and its output is connected to the main valve’s diaphragm chamber.

2. The main valve automatically adjusts its opening according to the secondary pressure, similar to a conventional pressure reducing valve. However, the opening fluctuates in response to pressure changes (smaller when fully open, larger when slightly open), which causes an offset.

3. The pilot controller operates by opening to release the control fluid externally when the secondary pressure is high and closing to send the control fluid to the main valve when the secondary pressure is low. Since the main valve and the pilot controller operate almost simultaneously, the secondary pressure remains stable even when load fluctuations occur.

3. Specifications and Materials

Hybrid Pressure Reducing Valve Model		PMD31P	PMD31LP	PLG61-2P
Main Valve Section	Model	PMD31	PMD31L	PLG61-2P
	Fluid	Gas • Liquid	Gas	Gas
	Nominal Diameter	15–100	15–100	15–50
	Primary Pressure	0.055–1.0 MPa	0.02–0.4 MPa	2.5–400 kPa
	Set Pressure Range	15–80A: 0.035–0.3, 0.2–0.7 MPa 100A: 0.035–0.3, 0.2–0.55 MPa	10–50 kPa	0.5–1.4, 1.2–3.3, 3.0–8.0, 7.0–20 kPa
	Temperature	0–80°C
	Major Materials	Please refer to each main valve catalog.
PC Section	Operating Fluid	Air
	Operating Pressure	140–250 kPa (1)	100 kPa	20–40 kPa (1)
	Air Consumption	Approximately 2002 L/h (Standard Condition)		Approximately 402 L/h (Standard Condition)
	Connection Port	JIS Rc1/4 (Threaded)
	Major Materials	Body & Valve: Stainless Steel, Spring Protection Tube: Aluminum Alloy, Diaphragm: Synthetic Rubber, Throttle Valve & Piping: Copper Alloy

Note (1): The operating pressure varies depending on the set pressure.

4. Performance and Cv Value

Hybrid Pressure Reducing Valve Model		PMD31P (PMD31LP)									PLG61-2P
Nominal Diameter		15	20	25	32	40	50	65	80	100	15	20	25	32	40	50
Cv Value		1.8	2.6	4.5	7.0	10.1	18	28.1	35	55	1.8	2.6	3.9	6.3	8.3	13
Performance	Minimum Set Differential Pressure	10 kPa (5 kPa)									2 kPa
	Offset	Below 5 kPa (Below 1 kPa)						Below 10 kPa (Below 2 kPa)			Below 0.1 kPa
	Shutoff Pressure Increase	Below 5 kPa (Below 2 kPa)						Below 5 kPa (Below 2 kPa)			Below 0.2 kPa (3)
	Minimum Adjustable Flow Rate	Please refer to each main valve catalog.
	Seat Leakage	Below 0.01% of the rated valve flow rate

Note (2): The values vary depending on the set pressure and the piping conditions before and after the valve.
Note (3): The values may increase depending on the main valve settings.

5. Structure, Dimensions, and Mass

5.1 Structure, Dimensions, and Mass of PMD31P and PMD31LP Models

Dimensions and Mass (mm, kg)

Nominal Diameter	L	Hi	h2		h3	E	Fi	F2	f3	Mass	Main Valve: Pipe Connection, Valve Box Material: Cast Iron
			PMD31P	PMD31LP
15	196	70	314	358	165	155	88	128	159	15	Flange Type JIS10K Full Face
20	200	70	314	358	165	155	88	128	159	16
25	200	70	314	358	165	155	88	128	159	16
32	175	70	314	358	165	155	88	128	159	17
40	190	80	322	368	175	155	88	128	159	19
50	195	80	322	368	175	155	88	128	159	20
65	230	104	422	481	254	210	109	156	180	37
80	250	104	422	481	254	210	109	156	180	38
100	290	127	456	529	289	250	126	176	197	61

Note: Valve box materials made of bronze or cast stainless steel are also available.

5.2 Structure, Dimensions, and Mass of PLG61-2P Pressure Reducing Valve

Dimensions and Mass (mm, kg)

Nominal Diameter	L	Hi	h2	h3	h4	Mass	Main Valve: Pipe Connection, Valve Box Material: Cast Iron
15	180	81	451	25	298	23.5	Flange Type JIS10K Full Face
20	185	81	451	25	298	23.5
25	196	84	455	30	302	25
32	220	92	478	53	325	28
40	220	92	478	53	325	29
50	230	92	478	53	325	30

6. Piping Example

(mm)

Nominal Diameter	15–32	40 • 50	65–80	100
Above Piping Center	520	530	650	720
Below Piping Center	190	200	340	400

(mm)

Nominal Diameter	15〜50
Above Piping Center	520
Below Piping Center	190

7. Precautions for Use

• Before use, please read the “Instruction Manual” carefully.
• When piping for operating air, always perform a blow operation before connection to completely remove scale and debris.
• Supply constant pressure operating air to the pilot controller (PC) using a pressure reducing valve with a filter.
• Ensure that the exhaust port of the pilot controller is not blocked.
• When using the PMD31P model with liquid, be sure to completely remove any trapped air inside at the start of water flow.