High Flow Back Pressure Regulator: 150-6000 psi Outlet

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.


Type Back Pressure Regulator
Special Features High Flow
Maximum Rated Pressure 6000 psi (40 MPa)
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
Leakage Zero external; 0.1 SCFM internal
Weight 17.6 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 Not Included

Typical Applications

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