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  • Very accurate cracking pressure
  • Zero leakage up to 95% of cracking pressure
  • 100% seat leakage tested
  • Tamper-proof adjustment
  • PED certifications and CE marking available for most models
Proper filtration is recommended to prevent damage to sealing surfaces.
Unit of Measure



N/A HP500

Operating Pressure

N/A 150 to 575 psig10 to 40 bar

Body Material

N/A Brass

O-Ring Material

N/A Viton®

Valve Size

N/A 1/4 in

End Connections (Inlet/Outlet)

N/A Popoff male pipe

Cracking Pressure

N/A 150 to 575 psig

Cracking Pressure Tolerance

N/A ±5%

Operating Temperature

N/A -20 to 400 ºF

Spring Material

N/A 17-7 PH Stainless Steel

Dim. A

N/A 1.17 in


N/A 5/8 in

Shipping Weight

N/A .06 Pound


N/A .06 lbs



  • System overpressure protection
  • Storage tanks
  • Freon® recovery systems
  • Medical equipment
  • Refrigeration & heating equipment
  • Measuring & dispensing pumps
  • Communications equipment
  • Process control instruments
  • R & D pilot plants


N/A Leakage: Ascending pressure 0 up to 95% of cracking pressure

Reseal pressure: 90% of cracking pressure

Leakage at Reseal pressure: Zero


N/A For Your Safety
It is solely the responsibility of the system designer and user to select products suitable for their specific application requirements and to ensure proper installation, operation, and maintenance of these products. Material compatibility, product ratings and application details should be considered in the selection. Improper selection or use of products described herein can cause personal injury or property damage.

Check Valves
Relief Valves
Truelok® Face Seal & Mini Fittings
Circle Seal Solenoid Valves
Jefferson Solenoid Valves
Atkomatic Solenoid Valves
GO Regulator
Cryogenic Valves & Equipment
Hoke Valves
Gyrolok® Tube Fittings
Circle Seal Control Valves
Measurement Devices
Additional Products

1533 Gehman Road | Harleysville, PA 19438 | Phone: 267-933-6300 | Fax: 267-933-6305 | Toll Free: 800-645-6733 | Email:
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