The SV series Murphy fuel solenoid valve, which is solenoid operated, is a normally closed valve that opens when current is supplied from the battery through a magnetic switch.
Temperature, level or pressure Swichgauge® instruments installed on the diesel engine and pump or compressor trip the magnetic switch breaking the circuit from the battery which closes the valve and stops the engine.
The Murphy fuel solenoid valve is for use with diesel engines with externally accessible fuel injection pumps. The volume of fuel required for the engine to operate must be able to pass through the 3/16 in. (5 mm) or 1/4 in. (6 mm) orifice of the valve. You must be able to attach the fuel valve
directly onto or in close proximity to the fuel injection pump in order to close off fuel flow to the pump.
The SV series is NOT intended for use with engines having unit injectors or distributor type injection pumps. Use only with diesel fuel.
The SV-12 valve operates on 12 volts DC, has a 1/4″ NPT inlet and outlet and a full 3/16 in. (5 mm) orifice.
The SV valves open against 30 psi [2.07 bar] inlet pressure
More Murphy control and monitoring equipment here.