For a high quality pressure relief valve Kunkle 337 can be purchased preset per your requirements up to a maximum pressure of 60 psig and a minimum pressure of 1 psig.

Kunkle Relief Valve Features:

• Large nozzle design provides high capacity.
• Flat bronze valve series are lapped for optimum performance.
• Warn ring offers easy adjustability for precise opening with minimum pre-open simmer and exact blower down control.
• Pivot Between disc and spring corrects misalignment and compensates for spring side thrust.
• A lift handle is provided for easy manual testing.
• Protects low to medium pressure blowers and compressors. It is well suited for positive displacement blowers.

Connections:

• 2.5″ MPT (Male Pipe Thread) fitting for mounting on system
• 2.5″ FPT (Female Pipe Thread) fitting to allow for piping away the relief flow

Materials of Construction:

• Nozzle – Bronze, SB62
• Set Screw A108-1018 Brass Plated
• Regulator Ring – Bronze B584-C84400
• Disc – Bronze B584-C84400
• Spring Step – Steel A109 Coated
• Spring – SS A313-302
• Body – Cast Iron A-126, Class A or B
• Compression Screw – Bronze B584-C84400
• Stem – Brass B16
• Regulator Ring Set Screw – Brass B16

Weight: 12 lb (5.4 kg)
The 337 will not have a code stamp or ‘NB’ on nameplate below 15 psig setting.
Capcities based on Air (SCFM)

The table below shows flow values in scfm at set points from 1 to 15 psig

Part Number Guide