Boiler Test Pump

This hydraulic test pump was built to pressure test boilers. 

The design was based on a pump seen in a magazine. However the original design used a casting; this version was fabricated from brass plate and bar.

The piston had an o-ring seal and the pump would hit the maximum pressure of 250psi in just a few strokes.

The pump contained a non-return valve was a bronze ball in a brass seat, but it didn't seal well all the time. This needed to be addressed because the standard pressure test was to pump a boiler up to pressure, and check that it could hold this pressure for 10 mins.

In the end the bronze ball was replaced with a nitrile rubber ball of the same diameter.

Plans for the pump can be downloaded by clicking the image on the right.