Changing a solenoid valve armature

Isolate and remove the electrical power supply and electrical DIN connector.

Remove the coil retaining nut and washer, put carefully to one side.

Fit the solenoid coil off the armature tube assembly

 In this picture we show two types of solenoid armature assembly.

The top is a 2/2 way normally open armature

The bottom 3 pieces is a 2/2 way normally closed core tube assembly.

In some instances the function of a solenoid valve can be changed from normally open (fail safe open) or normally closed (fail-safe closed) simply by changing the armature assembly.

If the solenoid valve is still fitted to the pipework - Check that there is no system pressure, as any residual pressure or media will escape at this point.

Using a spanner (typically 22mm) remove the armature assembly for the solenoid valve (turn anti clockwise).

Carefully install the new armature assembly, taking care not to cross the threads as this can damage the solenoid valve housing and prevent external sealing.

Replace the solenoid coil.

Replace the coil retaining washer and locating nut and tighten carefully. Do not over tighten. Tighten by hand then use spanner and give 1 full turn of locking nut.

Reinstall electrical connector.

Make final checks that no parts have been missed during the installation process.

Install the solenoid valve pack into the pipework, reconnect the power supply and open the isolation valves and check for leaks.

If no leaks are found reconnect the electrical power supply and energise the solenoid valve.

Check for noise, humming or overheating and if there are concerns isolate the power supply, close the isolation valves and consult your solenoid valve supplier.

 Read more about solenoid valve armatures here..