Solenoid Valves

How to change a solenoid valve armature assembly.


During normal maintenance procedures or when a solenoid valve fails, engineers may need to disassemble the solenoid valve, check and or replace the solenoid valve armature assembly. There are some simple guidance steps on how to change a solenoid valve core tube or armature assembly or simply convert a 2/2 way normally closed (failsafe closed) solenoid valves into a 2-way normally open (failsafe open) solenoid valve.


Read our FAQ section for more information and guidance.


solenoid valve armature installation Isolate the solenoid valve, turn off and drain pipework system and secure the solenoid valve safely.
 solenoid valve armature installation

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

 solenoid valve armature installation

 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.

 solenoid valve armature installation

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).


solenoid valve armature installation

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.

solenoid valve armature installation

Replace the solenoid coil.

solenoid valve armature installation

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.


solenoid valve armature installation

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..

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