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What does a Pressure Limiting Valve do?

PLV example

A pressure limiting valve is a device used to control and limit the pressure of water which flows through it. Essentially it takes the pressure off the other components in the system such as your pump, pipes or tapware. It is a small but essential part in many underbench systems and vital to ensure the protection (and warranty) of your filter.

Three reasons why you should install a Pressure Limiting Valve (PLV)

  1. I just turned the kitchen tap on and water exploded from the faucet … should have used a pressure limiting valve! Overpressure events can occur due to things such as temperature fluctuations, pump failures, blockages, or other malfunctions. These events can result in sudden pressure spikes which can not only cause a mess (and water damage) but damage to your water filter. A pressure limiting valve acts as a safeguard by opening and relieving excess pressure when it exceeds a pre-set limit.
  2. My kitchen water pressure is all over the place, I never know if I’m going to get a dribbly flow or lose an eye when I turn on the tap … you should definitely use a pressure limiting valve! A PLV helps maintain a stable and controlled pressure environment, ensuring reliable and consistent flow (as long as you have the right pump for the job if you’re not on mains water) and helps avoid damage to sensitive components in the system such as your filter.
  3. My filter just exploded and now the warranty is void … should have used a pressure limiting valve! Many manufactures of appliances or equipment where water passes through – such as taps, dishwashers, hot water systems and pumps, – set a maximum inlet water pressure. The same goes with water filters! If water pressure exceeds this maximum then the warranty is void. Using a PLV means you know your pressure won’t exceed the maximum and can rest assured your warranty will be valid.

If you have a water filtration system but don’t have a pressure limiting valve, get onto it today. It’s important to keep the pressure under 350 kPA, especially if you have one of our Microlene under bench systems (model numbers MQCPP, MQCSP, MPP and MSP), because the warranty on these products is void if no PLV is installed.

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Why Should I Change my Pressure Limiting Valve Regularly?

PLVs don’t have a recommended life span but because they are prone to wear and tear, we often recommend they be replaced with each filter change. If a PLV fails it can produce so much water pressure your filter cartridge could explode, causing your kitchen to flood. By not fitting a PLV you run the risk of voiding your home insurance policy if you need to make a claim for damages.

We’ve made it easy to remember to change your PLV by bundling a replacement filter cartridge and PLV together in one cost-saving package. Don’t have one fitted? We can help with that too.

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