Model 635 High Flow Back Pressure Regulator

Model 635 High Flow Back Pressure Regulator

  • Price:$139.00

  • 5 or more $125.10
  • 10 or more $111.20
  • 16 or more $107.03

Available Options

*The default selection shown above is generally good in stock, and can ship immediately. Choosing non-standard options may increase lead time 3-5 days.

AE Model 635 Component Operation and Maintenance Sheets -Click to follow

Model 635 High Flow Back Pressure Regulator      635 - General Service
                                                                                            635L - Low Temperature for CNG applications



Also known as a priority valve, the model 635 is a fully balanced economical regulator It's similar to our model 211 regulator but it is capable of much higher flow rates.
Its primary use is 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.
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. However, it can be set for pressures as low as 150 PSI.
Lighter than standard springs can be ordered to improve low pressure operation.

635 - General Service
635L - Low Temperature for CNG applications


• Maximum rated pressure - 6000 PSI (140 MPa)
• Set pressure - 1800 PSI nominal (adj. 150 to 6000 PSI)
• Materials - anodized aluminum body, bronze, stainless
• Flow capacity - 2 to 300 SCFM
• Leakage - Zero external: about 0.1 SCFM internal
• Ports - 1/2" female pipe thread
• Size - 5.3" x 2" x 1.5"


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


• Fully balanced (unaffected by outlet pressure)
• Sharp edged seat is self cleaning
• Simple, easily maintained design

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