TechTalk #17- Water Supply to Your High- Pressure Pump

CEMSA Water supply to your high pressure pump

The water supply to your high- pressure pump/ unit is more important than you think! John Rudman, our Dealer Sales Representative discusses some key points in this week’s TechTalk. Volume of water versus the pump’s flow and how many bar your feed has to be are some of the points highlighted. If you missed last month’s article about how to check the oil level on your pump, you can find it here 

You & Your Water Supply

When we receive a request for a new job, one of the first things we do is check the client’s water supply. This is for one of two reasons:

  1. Their water supply and pressure is insufficient or
  2. Their water supply and pressure is too high

In the event that the water supply is insufficient a machine with a holding tank will be recommended. This way, the pump always has a constant flow of water to prevent starvation and failure. For example, a machine such as our Pressure- Washer Diesel (PWD) will be fed from a JoJo tank. (Since the PWD does not come standard with a tank)

What if my Water Supply is Too High?

Should the water supply’s flow or pressure be too high, an inlet pressure reducer will be attached. This is most common in industrial parks where pressure fluctuates at night due to a reduction in usage. A pressure reducer is also often found in mining applications where water is carried down mine- shafts.

When the water supply to a tank is too high, the float valve malfunctions and your wash bay can flood. An inlet pressure reducer at a rough estimate cuts your inlet pressure by a 10th. So a 20 bar inlet would be reduced to 2 bar and a 10 bar inlet would become 1 bar and so on. You can see more about our inlet pressure reducer here or read our post on it here. The ideal flow rate is a positive feed of 2-3 bar. This amount is sufficient to prevent your pump from starving without overflowing it!


CEMSA stocks a wide variety of spares and accessories including any parts you may need to optimize your water flow. From inlet pressure reducers to float valves, we have it all! This, along with our network of dealers means that we can repair your pressure washer any day of the year.

Have an enquiry? Contact us here.

If you would like to apply for dealership status, contact us here.

Stay safe in these trying times! CEMSA stands with social distancing and are doing our utmost to not only implement the necessary measures, but also to provide the market with what is needed to ensure everyone’s safety. Take a look at our sanitizing unit that we have developed here. You can also read our blog in it here.

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