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Marsh Bellofram
P255 High Capacity Relief Valves

P255 High Capacity Relief Valves

P255 High Capacity Relief Valves

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P255 High Capacity Relief Valves

Product catalog summary

Specifications:

Zero leakage up to 98% of set pressure.
Set pressure tolerance is ±5% of preset value.
Reseal occurs at 92% of set pressure.
Available line sizes are 3/4" and 1" NPT.

P255 High Capacity Relief Valves:

Pipe sizes and dimensions: 3/4" NPT with a hex size of 3.39" and 1" NPT with a hex size of 3.79".
Set pressures range from 50 PSIG to 150 PSIG.

Materials of Construction:

Body and retainer made of CDA360 Brass.
Spring made of 302 Stainless Steel.
Seal made of Nitrile.

Flow Data:

Spring range varies from 45 to 150 PSIG.
Flow rates for natural gas, converted for air flow rate, range from 23,100 SCFH to 72,500 SCFH depending on set pressure and vessel pressure.

Ordering Information:

Part numbers and corresponding specifications are provided for different NPT sizes and set pressures.

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Catalog excerpts

P255 High Capacity Relief Valves-1

• Zero leakage to 98% of set pressure • Set pressure tolerance ± 5% of preset • Reseal at 92% of set pressure • Line sizes of 3/4" and 1" NPT

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