Accessories & Parts

1380 Differential Shut-Off Pilot

The Model 1380 is a two-way, normally open pilot that senses a high pressure under its diaphragm and a low pressure above the diaphragm. An adjustable spring in the low pressure chamber acts to keep the pilot stem assembly latched open, allowing flow through the pilot. When the differential pressure exceeds the spring setting the pilot trips closed. It remains closed until the differential is lowered and the pilot is manually reset to the open position.

The Model 1380 is the standard pilot for OCV Model 128 Excess Flow Shut-off Valve. Sensing the differential across the valve’s integral orifice plate, the pilot closes the main valve when the rate of flow exceeds the set point.

The Model 1380 can also be used in applications where closure of a valve is required when pressure differential exceeds a given amount. Example: differential across a filter.

  • Latched open, increasing differential trips pilot closed
  • Simple adjustment
  • Manual reset required after closing
  • All parts replaceable while mounted on valve
  • Stainless steel construction


Model 1380 Differential Shut-Off Pilot:
  1. Body
  2. Adaptor
  3. Bonnet
  4. Stem
  5. Spool
  6. Stem Guide
  7. Locking System
  8. Spring
  9. Diaphragm Plate
  10. Spring
  11. Spring Retainer
  12. Adjusting Screw
  13. Adjusting Screw Guide
  14. Cap
  15. O-Ring
  16. O-Ring
  17. O-Ring
  18. O-Ring
  19. O-Ring
  20. Diaphragm
  21. Roll Pin
  22. Pipe Plug
  23. Screw
  24. Lockwasher
  25. E-Ring
  26. Lock Nut
  27. Hex Head Capscrew
  28. O-Ring




Stainless Steel ASTM A743/CF8-M
Elastomers (diaphragm, seat disc, o-rings)

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


5-30 psig / 35-210 kPa


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 # 930017
Viton® Kit  –  Part # 930117
EPDM Kit  –  Part # 930417


The Model 1380 is shown on OCV Valve Schematics as:  1380symbol

EXAMPLE: Shown here on a MODEL 128 Excess Flow Shut-Off Valve.