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Products>>Section A- RegO / ECII>>Pressure Relief Valves and Relief Valve Manifolds>>Page A-18

                                                                                                                                                  


Pressure relief Valves and relief Valve Manifolds - General Information

LP-Gas Pressure Relief Valves Safety Warnings (PDF) 242.78 Kb.

Minimum Required Rate of Discharge for LP-Gas and NH3 ASME Containers (PDF) 217 Kb.

Pop Action Pressure Relief Valves - General Information

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 relief valve contained in this catalog with any other service commodity.

Fully Internal "Pop-Action" Pressure Relief Valves for Transports and Delivery Trucks

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

Part Number Start to Discharge Setting (PSIG) Container Connection Overall Height (approx.) Height Above Coupling (approx.) Flow Capacity SCFM / Air Suitable for Tanks with Surface Area Up to:* Protective Cap Included Order
UL (at 120% of Set Pressure) ASME (at 120% of Set Pressure)
A8434N 265 2" M. NPT 9 1/16"  1/2"  3,700 3,659 175 Sq. Ft. A8434-11B
A8434G 250 3,456
A8436N 265 3" M. NPT 17  7/8"  3/4"  10,210 9,839 602 Sq. Ft. A8436-11B
A8436G 250 9,598

* Per NFPA Pamphlet #58, Appendix D. Area shown is for UL or ASME flow rating—whichever is larger.

Fully Internal "Pop-Action" Pressure Relief Valves for Motor Fuel Containers

8543 Series relief valves are designed for use as a primary relief valve inlarger ASME motor fuel containers such as on buses, trucks and construction equipment. 8544 Series relief valves are designed for use as a primary relief valve in smaller ASME and DOT motor fuel containers such as on tractors, lift trucks, cars and taxicabs.

Part Number Container Type Start to Discharge Setting (PSIG) Container Connection

M. NPT

 Overall Height (approx.) Height Above Coupling (approx.) Hex Wrenching Section Flow Capacity SCFM / Air*** Protective Cap (Included) Accessories Order
UL (at 120% of Set Pressure) ASME (at 120% of Set Pressure) Pipeaway Adapter
8544G ASME 250 1" 5 7/16"  7/8"  1 5/16"  1,020 936 7544-41 7544-11A*
8543G 1 1/4"  1 11/16"  1,465 1,400 7543-40C 7543-10**
8544T 312 1" 1 5/16"  1,282 1,158 7544-41 7544-11A*
8543T 1 1/4"  1 11/16"  1,990 1,731 7543-40C 7543-10**
8544K DOT / ASME 375 1" 1 5/16"  1,545*** --- 7544-41 7544-11A*

* 1" M. NPT outlet connection.

** 1 1/4" M. NPT outlet connection.

*** Rating also applies to DOT requirements.

**** Flow rates shown are for bare relief valves. Adapters and pipeaway will reduce flow as discussed in forewording information.

7543-10

 

7544-11A

Products>>Section A- RegO / ECII>>Pressure Relief Valves and Relief Valve Manifolds>>Page A-18