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1/2 & 3/4 NPTF Pilot Operated Check Valves with Flow Controls Fast Advance and Slow Retract - Avoid Crash Landings

Patents Pending


Basic Operation:


Hold position when a pressure drop or total loss of pressure occurs. Flow control meters air from the output to the input port. Manual release to exhaust trapped air before maintaining the system (OSHA Requirement).

  • Lower Loads Slowly
  • Optional Manual Release
  • .0000522 cc/min Leak Rate




Operating Data:


Max Pressure:
150 psi
Min. Pilot Pressure:
40 psi
25 psi (see table)
Temp. Range:
30 - 150 F
Cycle Rate:
1 cyc./sec. max.
Flow Capacity (Cv):
3.8 max.
Cracking Pressure:
1-2 psi
Service:
Properly filtered dry air or lubricated air.


Model No. 1/2 NPTF 3/4 NPTF
No Manual Release B8100FL B12100FL
Manual Release B810MFL B1210MFL
Flush Manual Release B81FMFL B121FMFL
For a lower pilot pressure add (-K18) to the model # (ex. B810MFL-K18).
No. of Turns Equivalent Dia (in.)
.25 .15
.50 .21
.75 .26
1.0 .30
1.25 .34
1.50 .37
1.75 .40
2.0 .43
2.25 .45
2.5 .48
2.75 .50


Product Specs: (Click to see a larger images)