Forums » Ask a Question

Use this forum to post your questions to our experts – you need to be logged on to do it (you can register here ), then scroll down to the bottom of this page and click the blue Post Thread words

If you can help answer the question, feel free to post a reply – you need to be logged on to do it (you can register here ), then hit the reply button on the thread.


To go back to the experts page click here>>


Posted: Wed Feb 12, 2014 8:24pm

Post Subject: PRV Problems

We have a Jabsco Par Max 4 pump and the accumulator is set to just below 20psi as per Jabsco instructions, which works fine accept when we draw hot water off after its been heated in the calorifier. The PRV seems to open and vibrate the whole tank and doesn't stop for a while or until you manually open it. Why?


Posted: Thu Feb 13, 2014 9:05am

Post Subject: PRV Problems

First of all it probably has nothing to do with the accumulator. From the pressure setting you gave it suggests that your pump is set to cut out at about 40 psi. The PRV is often set at 2 bar (31 psi). The actual setting should be marked on it. You need to ensure that the pump cuts out several psi BELOW the PRV opening pressure. I think the two are so close on your boat it is setting up pressure waves in the system causing the valve to bounce. There should be an adjusting screw in the end of the pump but it may be under a label saying touching it invalidates the guaranty. Tony Brooks

Most Read

Newsletter Sign Up

Canal Boat monthly newsletter
Sign up to receive our regular email newsletter

Our Privacy Policy

Like us on Facebook

Follow us on Twitter

Cache: Disabled for this object  Total Queries: 43.  Total Objects: 162.  Total Unserialized: 3. Total Runtime: 0.23 seconds.