Relief Valve - General
The diaphragm relief valve is integral with the front cover. It is supplied preset at 60psi and
cannot be adjusted.
Front Cover
Valve Housing
Fig. 11
Relief Valve - Disassembly
- Ensure the pump and drive are isolated from the power supply, and close isolating valves on
either side of the pump.
- Before dismantling, or carring out any work on relief valve, any residual pressure must be
released.
- To release the residual pressure, slacken the front cover nuts to allow product to drain from
the pump head.
- The valve and front cover may now be removed from the pump by removing the r-clips and
front cover nuts.
- Before removing the valve housing, the spring pressure must be released.
- To release the spring pressure, the valve housing nuts must be slackened carefully until they
turn easily by finger.
- The valve housing can now be removed from the front cover by removing the nuts and an-
chor plate. Acess is now gained to the diaphragm.
- The diaphragm should be inspected for damage and wear, and replaced if necessary.
- Assembly is reverse of disassembly.
- Valve housing nuts should be tightened to a torque of 22 lb.ft.
Page 20
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