Manufacturer:  Fushiman Co.,LTD.
Model: PLG61-2

Model	Nominal Diameter	Primary Pressure	Secondary Side Setting Range	Maximum Operating Temperature	Body Material	Connection
PLG61-2	15〜50	MAX. 400kPa	0.5～20kPa	80℃	FC,SCPH,SCS	Flange

• PMD31L Type Pressure Relief Valve is used for low-pressure applications.
• Since a secondary balance method is used, the secondary side pressure is hardly affected by variations in the primary side pressure. In addition, the balance section uses diaphragms and bellows, so there is no risk of friction or leakage.
• The valve body uses sealing rubber, so the sealing performance when closing is excellent.
• For nominal diameters of 65 and above, please use the PRL Type Pressure Relief Valve.

Specifications and Materials

Fluid	Pressure kPa		Tempera- ture (°C)	Main Materials					Pipe Connec- tion
	Primary Side	Secondary Side Setting Range		Valve Body	Diaphragm Chamber Body	Spring Protection Tube	Valve Seat	Valve Body Diaphragm
Air and other non-corrosive gases	2.5 to 400	0.5 – 1.4 1.2 – 3.3 3.0 – 8.0 7.0 – 20	0 – 80	Cast Iron	Rolled Steel	Cast Iron	Stainless Steel	Synthetic Rubber	Flange JIS 10K Full Face

Notes:

• The valve body and box are also available in stainless steel or cast steel.
• ASME Class 150 is available for nominal diameters 20, 25, 40, and 50.
• The body and diaphragm are standard with NBR (nitrile rubber), but FKM (fluoro rubber) and Kalrez® are also available.
• The primary side pressure can be made up to 0.7 MPa (the secondary set range will be 1.4-3.3, 3.0-8.0, and 7.0-18 kPa).
• The connection part is also available in non-rubber and non-copper alloy versions.

Performance

(Reference: 1 kPa = 100 mm of water column)

Minimum Set Differential Pressure	2.0kPa
Offset (1)	15% or less of the set pressure (minimum value 0.3kPa)
Closing Pressure Rise	0.4kPa or less (Nominal diameters 15, 20, 25) 1.5kPa or less (Nominal diameters 32, 40, 50)
Minimum Adjustable Flow Rate (2) (3)	Nominal diameters 15, 20, 25: 0.5 to 2m³/h (Standard Conditions) Nominal diameters 32, 40, 50: 5 to 10m³/h (Standard Conditions)
Valve Seat Leakage	0.01% or less of rated flow rate

Notes:

1. The pressure conditions may cause an increase of more than 15%.
2. The larger the difference between the primary side pressure and the set pressure, the greater it becomes.
3. It is independent of the type of gas.

Note:
Generally, it shows the A characteristic, but for nominal diameters 15–25, when the difference between the primary side pressure and the set pressure is large, it shows the B characteristic. In the B characteristic, there may be a case where the O-ring becomes the maximum, in which case the O-ring becomes the offset.

CV Value

Nominal Diameter	15	20	25	32	40	50
Cv	1.8	2.6	3.9	6.3	8.3	13

For selected nominal diameters, there are restrictions on the maximum flow rate, in addition to the Cv value. For details, please refer to the section on nominal diameter selection on the following page.

Structure and Dimensions

Dimensions and Mass

(mm, kg)

Nominal Diameter	L		H1	H2	H3	Mass
	Valve Body Cast Iron	Cast Steel & Stainless Steel Cast Steel				Valve Body Cast Iron	Cast Steel & Stainless Steel Cast Steel
15	180	180	81	368	25	18.5	20
20	185	185	81	368	25	18.5	20
25	196	196	84	372	30	20	21
32	220	230	92	395	53	23	25
40	220	230	92	395	53	24	25
50	230	230	92	395	53	25	27

Note:
In the case of JPI and ASME, the face dimension method differs slightly.

Disassembly and Maintenance Space Required

(mm)

Nominal Diameter	15 – 50
From Pipe Center to Above	600
From Pipe Center to Below	320