Fluid Controls Ltd is one of the UK’s leading distributors for pressure control
pressure relief valve features

Maintenance of a Boiler’s Pressure Relief Valve

Carrying out basic, regular maintenance on a boiler will ultimately improve the performance of your boiler and increase its longevity. Water heater experts often suggest carrying out maintenance every six months, in order to reduce the chance of leakage caused by mineral and corrosion build up. Here, Fluid Controls offers advice when testing your boiler’s pressure relief valve.

How to test a pressure relief valve

Testing a boilers pressure relief valve is extremely simple. Raise and lower the test lever several times and by doing so, it will lift the brass stem that it’s fastened to. Once the lever has come away from the stem, hot water will rush out of the end of the drainpipe. If the water flows through the pipe, like it should be doing, turn down the water pressure to stop the leak, replace the lever and increase the pressure. However, if no water flows through the pipe, or there is just a trickle of water, you will need to take action.

One of the reasons why the valve may not be operating the way it should be doing is if debris has been lodged, as this may be preventing the valve from seating properly. To fix this, simply operate the test lever several times. If this doesn’t work, you may need to replace the valve.

Why pressure relief valve testing is important

A pressure relief valve is an important safety aspect of any boiler. The component contributes to the effective function of a boiler. By pressure relief valve testing every six months, you can troubleshoot any problems and get them fixed as necessary.

One of the main reasons why a pressure relief valve will become non-operational is due to a buildup of mineral salt, rust and corrosion. Finding these problems sooner will make them easier to combat and ensure your boiler performs optimally for the foreseeable future.

Testing a boilers pressure relief valve

There are a number of factors to look out for when testing a pressure relief valve, including:

• Pipe length
The pipe leaving the valve should be the same diameter as the exhaust port of the valve.

• Pipe material
The pipe should be made from a material that is resistant to heat, such as copper. Most boilers will already utilise this material, but if not, it is important to get it fixed.

• Drainpipe direction
The drainpipe should travel slightly downhill, from where the valve starts to where it terminates, finishing between 6 and 24 inches above the ground.

Pressure relief valves are an important aspect of any machinery where media is being used at high temperature or pressures. Fluid Controls are leading suppliers of pressure relief valves from Parker, suited to industrial applications. For more information, please contact (0)118 970 2060 or email fluid@fluidcontrols.co.uk.

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