How to Avoid Excess Pressure Damage on Your Pressure Cleaner


Excess pressure build up can damage the seals of your pump and cause costly down time for your pressure cleaner. Regulators and unloaders are the most reliable means of protecting your machine, as they set and maintain consistent pressure and also provide protection from dangerous over-pressurization.

In particular regulators/unloaders are a necessity when using a shut off gun (aka trigger gun) with your pressure cleaner. That’s because when a shut off gun is used, the bypass from the regulator is returned back to the inlet of the pump. When the pressure cleaner sits in bypass mode, the horsepower the pump uses heats up the water in the bypass loop. The longer the system sits in bypass mode, the warmer the water will get. Just three or four minutes in bypass mode can result in damage to the pump seals and packings as a result of overheating.

Whilst regulators and unloaders tend to be an optional add on when purchasing a pressure cleaner, we recommend paying that little bit extra to have one fitted as the protection they provide makes them a worthwhile investment.

What’s the difference between unloaders and regulator valves? Click here to watch CAT pumps easy to understand explanation.

Kerrick carries a range of unloaders and relief valves, we can supply them direct to you or you can bring your machine in to have one fitted, adjusted or replaced.

Note: Do not leave your water blaster running with the shut off gun closed for more than 1 or 2 minutes (even if a thermal protection valve has been fitted). By pulling the trigger on the gun, cold fresh water will be introduced into the bypass loop, helping to avoid damage from heat and pressure build ups. 

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