Designed specifically for use as a primary relief valve in ASME transports and delivery trucks with 2" and 3" NPT couplings.
Unit of Measure



  • Low profile design assures maximum protection against sheering or distortion.
  • All functioning parts are located below the level of the container connection to reduce the possibility of damage or tampering.
  • Longer spring size designed to minimize stress cracking in service.
  • Use of two different materials for stem and guide minimizes the possibility of stem seizure which may occur when similar materials are used.
  • Internal octagonal wrenching broach assures easy installation and removal.
  • ASME approved for use with LP-Gas and anhydrous ammonia.


Body Material

N/A Stainless Steel

Spring Material

N/A Stainless Steel

Stem Material

N/A Stainless Steel

Stem Bushing Material

N/A 17 - 4PH Stainless Steel

Seat Disc Material

N/A Resilient Synthetic Rubber


Start to Discharge Setting

N/A 265 psig

A. Container Connection

N/A 3" M. NPT

B. Overall Height (Approx.)

N/A 17-7/8 in

C. Height Above Coupling (Approx.)

N/A 3/4 in

UL (at 120% of Set Pressure)

N/A 10210

ASME (at 120% of Set Pressure)

N/A 9839

Suitable for Tanks with Surface Area

N/A up to 602 sq. ft.

Protective Cap (Included)

N/A A8436-11B

Product Type

N/A Fully Internal "Pop-Action" Pressure Relief Valves


N/A RegO

General Information

N/A The "Pop-Action" design permits the RegO® Pressure Relief Valve to open slightly to relieve moderately excessive pressure in the container. When pressure increases beyond a predetermined point, the valve is designed to "pop" open to its full discharge capacity, reducing excess pressure quickly. This is a distinct advantage over ordinary valves which open gradually over their entire range, allowing excessive pressure to develop before the relief valve is fully open. All RegO® internal, semi-internal, and external relief valves incorporate this "Pop-Action" design.

Relief Valves in this catalog are only intended for use in LP-Gas or anhydrous ammonia service. Do not use any other service commodity. If you have an application other than conventional LP-Gas or anhydrous ammonia service, contact REGO® before proceeding.