High Flow Back Pressure Regulator: 0-200 psi Outlet


Low-pressure back pressure regulator, 1/2 in FNPT. Maximum rated pressure: 6000 psi. Outlet pressure adjustment range: 0-200 psi (0-14 bar). Pressure can be adjusted by turning the included SKU 378 K control knob/screw assembly.


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.


Type Back Pressure Regulator
Special Features High Flow
Low Pressure Outlet
Maximum Rated Pressure 6000 psi
Adjustment Range 0-200 psi (0-14 bar)
Inlet Port Size 1 ea 1/2 in FNPT
Outlet Port Size 1 ea 1/2 in FNPT
Outlet Pressure Rating 6000 psi
Flow Capacity 2 to 300 SCFM
Leakage Zero external; 0.1 SCFM internal
Weight 18 oz (500 g)
Size 5.25 x 2 x 1.5 in
Minimum Temperature -15ºF (-26ºC)
Body Material Anodized Aluminum
Internal Materials Brass 
Seal Materials Viton
Flow Coefficient (Cv) 0.6
Control Knob Screw Assembly SKU 378 K Included

Typical Applications

  • Separator and filter systems
  • Compressors
  • Control systems
  • Cascading systems