425285 Solenoid Valve 425285, 3 port , NC, 24 V dc, 1/4in. Compact solenoid valves suitable for most gas and fluid handling applications. Where practical, valves are shown with a schematic diagram showing the (circuit) function. The diagram is laid out so that the left hand side of the diagram describes the valves operation when the coil is energised. When the coil is de-energised, the spring (or servo-assist) return controls the valve and this is described on the right hand side of the diagram, see the typical schematic diagram below.