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A radiator is an essential part of many homes, providing warmth and comfort. However, like any other household system, it can face issues. A common problem faced by homeowners is a leaky radiator, which can send your water and heating bills through the roof. Knowing how to turn off a radiator valve can be the difference between a minor inconvenience and a major mishap. This guide will walk you through the steps to safely and efficiently turn off a radiator valve, ensuring you're prepared for any leaks.

Essential Tools & Equipment

Step 1: Identify The Type Of Valve

  • Different radiators come with different types of valves. 

  • Identify the valves on either side of your radiator – you will usually have a thermostatic valve (TRV) on one side and a lock shield valve on the other.

  • To isolate a radiator, you need to turn off the valves on both sides.

Step 2: Turn Off The Lock Shield Valve

  • Using an adjustable spanner or flat head screwdriver, turn the valve head clockwise until it comes to a complete stop. 

  • If the head keeps spinning without resistance, remove it to expose the stem underneath. 

  • Using an adjustable spanner, turn the stem to the right until it stops.

Step 3: Address Potential Leaks

  • If you notice a leak after turning off the valve, gently tighten the plastic collar to stop it.

Step 4: Turning Off The Thermostatic Radiator Valve

  • Turning off a thermostatic radiator valve is easy – simply turn the valve to zero to isolate it.

Step 5: Release Excess Pressure

  • Open the radiator bleed valve using a radiator bleed key or flat-head screwdriver. 

  • This will release any excess pressure and confirm that the radiator is isolated.

  • Take a look at our guide for How To Bleed A Radiator.

  • You can now call a Gas Safe engineer who can repair the radiator. 

Frequently Asked Questions

How do I know which type of valve my radiator has?

My radiator valve keeps spinning. What should I do?

The radiator is still leaking after turning off the valve. Why?

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