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Designed for pneumatic systems, Conoflow Series GVB Snap-Acting Relays change ports to switch or lock-in secondary air source when the main supply pressure falls below a predetermined set point. In the event of supply or pilot pressure failure, the positive action relay with one common and two inlet or outlet ports will automatically:

  • Switch from main to auxiliary supply pressure
  • Lock an actuator in its last position
  • Extend or retract an actuator stem
  • Divert flow or pressure from one device to another

The Series GVB Snap-Acting Relays have an integral pilot which eliminates the extra piping and connections required with other lock-up valves. Compact and lightweight, the relays are easily piped and mounted.
GVB Snap Acting Relays


    • Set Pressure: 25 to 85 psi (172 to 586 kPa)
    • Maximum Relay Valve Pressure: 150 psi (1034 kPa)
    • Maximum Signal Port Pressure: 100 psi (690 kPa)
    • Relay Valve Port Diameter: 3/16” (4.76 mm) (Cv=0.38)
    • Max Pilot Air Consumption: 3.1 scfh (1.5 lpm) when operating in “A” to “B” circuit mode.
    • Temperature Range: 0 to 150 °F (-18 to 66 °C)
    • Connections:
    •   Sensing Port: 1/8” NPT
    •   All Others: 1/4” NPT
    • Weight:
    •   GVB11: 1-3/4 lbs. (0.79 Kg)
    •   GVB12: 2-3/4 lbs. (1.25 Kg)

NOTE: 1. Supply (Pilot) pressure must be at least 20% greater than set pressure

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