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1/4 & 3/8 NPTF Swivel Mount Pilot Operated Check Valves with Flow Controls

Patents Pending

Basic Operation:

Hold position when a pressure drop or total loss of pressure occurs. Fast advance and slow retract to avoid crash landings. Manual release to exhaust trapped air before maintaining the system (OSHA Requirement).

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

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.
Flow Capacity (Cv):
Cracking Pressure:
1-2 psi
Properly filtered dry air or lubricated air.

Model No. 1/4 Swivel 3/8 Swivel 1/2 Swivel
1/4 NPFT Input Port
No Manual Release B4S00FL-25 B4S00FL-38 B4S00FL-50
Manual Release B4S0MFL-25 B4S0MFL-38 B4S0MFL-50
Flush Manual Release B4SFMFL-25 B4SFMFL-38 B4SFMFL-50
3/8 NPFT Input Port
No Manual Release B6S00FL-25 B6S00FL-38 B6S00FL-50
Manual Release B6S0MFL-25 B6S0MFL-38 B6S0MFL-50
Flush Manual Release B6SFMFL-25 B6SFMFL-38 B6SFMFL-50
For a lower pilot pressure add (-K18) to the model # (Ex: B6S0MFL-25-K18)

Product Specs: (Click to see a larger images)