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

• 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

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)

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

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)

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

Disassembly and Maintenance Space Required

(mm)