125mm Bare-Valve Reseating Relief Pressure Regulator, Weld-In Connection Style

These advanced-design, strong-bodied, precision- manufactured MODULAR regulators are superior in their ability to overcome dirt and sticky oil during opening and tight closing. Models are available for nearly every control function requirement of industrial ammonia and commercial halocarbon refrigeration.

Inlet pressure is channelled through the internal equalization passage to the reseating relief control module. When inlet pressure exceeds the relief setting, the control module opens wide to allow pressure to enter the space on top of the piston. This causes the main valve seat to open and relieve the inlet pressure, provided the outlet pressure is at least 2 psi (0.14 bar g) lower. A 5 psid (.35 bar g) closing spring is standard on 3/4" through 1 1/4" valves. When used for defrost relief from low side to an intermediate pressure, a check valve on the outlet is required to prevent back flow during refrigeration.

This product is a 125mm HA4A Pressure Regulator with Reseating Relief, which includes a weld-in connection style.

Any accessories needed are to be purchased separately; this product does not come with a strainer. 

Please refer to the table below to aid pressure setting selection. Pressure Ranges C and V will incur additonal costs. Pressure Range C requires a CO2 rated valve.