High Flow Back Pressure Regulator - 6000 psi 1/2 in FNPT

High flow back pressure regulator, 1/2 in NPT. Maximum pressure rated to 6000 psi (414 bar). Outlet pressure adjustment range of 150-6000 psi (10-414 bar). The set pressure can be adjusted by loosening the jam nut and turning the adjusting screw.

Also known as a priority valve, the model 635 is a fully balanced economical regulator. It is similar to the model 211 regulator but is capable of much higher flows. It is used primarily on compressors to maintain back pressure on filters and separators thus improving their efficiency as much as 1000%.

The stainless steel metal to metal seat is designed to be self cleaning and prevent freeze up. It maintains constant back pressure (set pressure) independent of outlet pressure. When outlet pressure (such as in a tank being filled) reaches set pressure the regulator opens fully permitting unrestricted flow. Normally the valve is set for back pressures of 1500 to 6000 psi (103-414 bar). However, it can be operated with set pressures as low as 150 psi (10 bar). Lighter than standard springs can be ordered to improve low pressure operation.



Back Pressure Regulator

Special Features

High Flow

Maximum Rated Pressure

6000 psi (40 MPa)

Set Pressure

1800 psi (124 bar)

Outlet Pressure Setting Range/Adjustment Range

150-6000 psi (10-414 bar)

Inlet Port Size

1 ea 1/2 in FNPT

Outlet Port Size

1 ea 1/2 in FNPT

Outlet Pressure Rating

6000 psi (414 bar)

Flow Capacity

2 to 300 SCFM


Zero external; ~0.1 SCFM internal


500 g


5.3 x 2 x 1.5 in

Minimum Temperature

-15ºF (-26ºC)

Body Material

Anodized Aluminum

Internal Materials


Seal Materials


Flow Coefficient (Cv)


Typical Applications

Separator and filter systems
Control systems
Cascading systems