Manufacturer:  Fushiman Co.,LTD.
Model: PRL

• Low-pressure, automatic diaphragm-type pressure relief valve for air.
• For large flow (Nominal diameter 65–150).
• For small flow (Nominal diameter 15–50), please use PLG61-2 type pressure relief valve or PMD31L type pressure relief valve.

Specifications and Materials

Note:

1. The size of the top work (adjustment part) may vary. Please refer to the “Secondary Set Pressure Range (Spring section)” and the “Maximum Differential Pressure by Top Work Type” below.
2. This entire range cannot be covered by one screw. Please refer to the “Secondary Set Pressure Range (Spring section)” and “Top Work Type Maximum Differential Pressure” below.

Additional Information:
The valve body can be made of either cast steel or stainless steel. In this case, ASME Class 150 is also available.

Secondary Set Pressure Range (Spring section) and Maximum Differential Pressure by Top Work Type Table

Note:
By adding the maximum differential pressure (ΔP MAX) to the set pressure, the allowable maximum primary side pressure is obtained. However, the maximum allowable pressure for the secondary side is 500 kPa.
Example 1: If the nominal diameter is 100 and the set pressure is 10 kPa, adding the ΔP MAX from Top Work C results in a primary side pressure of 10 + 300 = 310 kPa.
Example 2: If the nominal diameter is 80 and the set pressure is 20 kPa, adding the ΔP MAX from Top Work D results in a primary side pressure of 20 + 490 = 510 kPa, which exceeds 500 kPa, so it becomes limited to 500 kPa.

Performance

CV Value

Structure and Dimensions

Structure and Dimensions

(mm, kg)

Note
(4) This shows the case for Top Work Type C.

Top Work Outer Diameter

(mm, kg)

Note
(5) When the top work is other than type C, the values from the table above may be added or subtracted.