ISOV Failsafe Emergency Valve

ISOV Failsafe Valves are often used on offshore cranes as well as on Oil and Gas installations whereby the valve has to close whenever electric power is lost.
The FS version requires Oil or Air pressure to guarantee its functionality. The basic working principle is that Pressure holds the valve open by energizing a 2/3 way Normally Closed solenoid valve.
When power is lost the solenoid creates loss of pressure causing ISOV to trip and close.