Accessories & Parts

1330 Pressure Relief Pilot

The Model 1330 is a two-way, normally closed pilot, that senses pressure under its diaphragm and balances it against an adjustable spring load. An increase in pressure above the spring set point, tends to make the pilot open.

The Model 1330 is the standard pilot for OCV Series 108 Pressure Relief/ Sustaining Valves as well as the Model 108FC Fire Pump Relief Valve. Sensing upstream pressure and opening at the set point, modulates the main valve to maintain the required pressure.

There are other applications for the Model 1330 as a normally closed, pressure to open control.

  • Normally Closed, increasing pressure opens
  • Multiple spring ranges for accurate control
  • Can be local or remote sensed
  • Simple adjustment
  • All parts replaceable while mounted on valve
  • Rubber to metal seat for positive shut-off
  • Bronze or stainless steel construction



Model 1330 Pressure Relief Pilot:
  1. Body
  2. Bonnet
  3. Adaptor
  4. Plug
  5. Diaphragm
  6. Seat Disc
  7. Stem
  8. Diaphragm Plate
  9. Spring
  10. Adjusting Screw
  11. Spring Retainer
  12. Hex Head Capscrew
  13. Lockwasher
  14. Hex Nut
  15. Cap
  16. Hex Nut
  17. Hex Head Capscrew
  18. O-Ring
  19. O-Ring
  20. O-Ring
  21. O-Ring
  22. Lockwasher



Low-Lead Bronze
Stainless Steel
Elastomers (diaphragm, seat disc, o-rings)

  • Buna-N (Std.)
  • Viton® (Opt.) Viton is a registered trademark of DuPont Dow Elastomers
  • EPDM (Opt.)


Rubber components are typically the only parts that may require periodic replacement. These are available in kits consisting of the diaphragm, the seat disc and all O-rings.
Buna-N Kit  –  Part # 930000
Viton® Kit  –  Part # 930100
EPDM Kit  –  Part # 930400


The Model 1330 is shown on OCV Valve Schematics as:  1330symbol

EXAMPLE: Shown here on a MODEL 108-2 Pressure Relief / Sustaining Valve.