Picture of 1/2" NPTF Pneumatic Counterbalance Valve

1/2" NPTF Pneumatic Counterbalance Valve

NGT’s B81C00 is a pneumatic counterbalance valve that will hold a load in position until pressure or force is applied to move the load. The B81C00 has 1/2 NPTF in/out ports and a blocked pilot port. It has standard temperature seals and no manual release.
  • Counterbalance valves are internally piloted: the pilot port is plugged, and the valve has a small channel connecting both sides
  • When air is supplied to the other side of the cylinder (retract side), advance side will vent only after pilot signal is energized from pressure buildup on the advance
  • Prevents runaway for vertical cylinders with load
  • Can hold load in the middle of cylinder stroke
  • Allow cylinder to travel at higher speeds
  • Tightening the adjusting screw will increase spring tension holding the valve closed, making the valve more responsive
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Product Drawing for 1/2" NPTF Pneumatic Counterbalance Valve
Product Figures for 1/2" NPTF Pneumatic Counterbalance Valve
Product Schematic for 1/2" NPTF Pneumatic Counterbalance Valve
Application & Function

NGT’s B81C00 is a pneumatic counterbalance valve that will hold a load in position until pressure or force is applied to move the load. Counterbalance valves help prevent cylinder runaway for vertical cylinders carrying a load. The B81C00 has 1/2 NPTF in/out ports and a blocked pilot port. The valve is internally piloted via a small air channel connecting both sides of the valve. As pressure builds in the valve during cylinder runaway, the valve will flutter and not reopen until the pilot signal is energized, continuously modulating. It has standard temperature seals and no manual release.

Technical Specs
Flow Capacity: 3.8
Max. Pressure: 120
Pilot Port: N/A
Port Size In: 1/2 NPTF
Port Size Out: 1/2 NPTF
Document: -B81CXX.docx
Type: Counterbalance
Adjustable Pilot Pressure: False
Flow Control: False
Counterbalance: True
Is it Swivel: False
Material: Standard
TraceParts Model: 90-27042021-037812