External “Pop-Action” Supplementary Pressure Relief Valves for

Small ASME Containers and DOT Cylinders

Designed for use as a supplementary relief valve on small ASME

above ground and underground containers. They may also be used
as a primary or secondary relief device on DOT cylinders, or as
hydrostatic relief valves. UL ®

All working components of these relief valves are outside the container
connection, so the valves must be protected from physical damage.

Accessories

Flow Capacity SCFM/Air Pipeaway Adapter

Start To UL
Discharge Container Overall Wrench (At 120% ECII® Rated Suitable for
Container Setting Connection Height Hex of Set at 480 Tanks w/Surface Protective
Part Number Type PSIG M. NPT (Approx.) Section Pressure) PSIG*** Area Up To:* Cap Part Number Outlet Size
3127G ¼” 1 31 32” ⅞” 295 -
ASME 250 - -
3129G ½” 2 19 32 ” 1⅛” 465 3129-10 ½” F. NPT
7545-40
3127K ¼” 1 31 32” ⅞” 450 100 lbs./Propane -
DOT 375 -
3129K ½” 219 32 ” 1⅛” 780 200 lbs./Propane 3129-10 ½” F. NPT
* Flow rates shown are for bare relief valves. Adapters and pipeaways will reduce flow as discussed in forewording information.
** Not UL or ASME rated. ECII® rated at 480 PSIG.
*** Meets DOT requirements.

External Hydrostatic Relief Valves

Designed especially for the protection of piping and shut-off valves

where there is a possibility of trapping liquid LP-Gas or anhydrous
ammonia. They may be installed in pipelines and hoses located
between shut-off valves or in the side boss of RegO® shut-off valves.

3127G
Accessories

Pipeaway
Start To Container Wrench
Part Discharge Valve Body Connection Height Hex Protective Adapter or
Number Setting PSIG Material M. NPT (Approx.) Section Cap Threads
SS8001G ¼” 11
16”
⅞” -
SS8002G Stainless ½” ⅞”
-
SS8021G Steel ¼” 11
16” ¼” NPSM Thrds
250 1⅜”
SS8022G ½” ⅜” NPT Thrds
⅞”
3127G ¼” 1 31 32” -
3129G ½” 219 32” 1⅛” 3129-10*
3127H ¼” 1 31 32” ⅞” -
275
3129H ½” 219 32” 1⅛” 3129-10*
Brass 7545-40
3127P ¼” 1 31 32” 1⅛” -
300
3129P ½” 219 32” 1⅛” 3129-10*
3127J
3129J
¼”
½”
1 31 32”
219 32”
⅞”
1⅛”
-
3129-10*
UL
®

SS8001J ¼” 11
16”
350 ⅞” -
SS8002J Stainless ½” ⅞”
-
SS8021J Steel ¼” 11
16” ¼” NPSM Thrds
1⅜”
SS8022J ½” ⅜” NPT Thrds
⅞”
3127K ¼” 131 32” -
375 7545-40
3129K ½” 219 32” 1⅛” 3129-10*
3125L Brass 1 9 16” ⅝” Included
¼” -
3127L 131 32” ⅞” 7545-40
3129L ½” 219 32” 1⅛” 3129-40P 3129-10* SS8022G
SS8001L 400 ¼” 11
16”
⅞” -
SS8002L Stainless ½” ⅞”
-
SS8021L Steel ¼” 11
16” ¼” NPSM Thrds
1⅜”
SS8022L ½” ⅜” NPT Thrds
⅞”
3127U ¼” 131 32” -
Brass 7545-40
3129U ½” 2 19 32” 1⅛” 3129-10*
SS8001U ¼” 11
16”
450 ⅞” -
SS8002U Stainless ½” ⅞”
-
SS8021U Steel ¼” 11
16” ¼” NPSM Thrds
1 ”
SS8022U ½” ⅞” ⅜” NPT Thrds
* 1⁄2” F. NPT outlet connection.

44
® Pressure Relief Valves & Relief Valve Manifolds