Specifications

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3.8 Integral Pressure Relief Valve.
Integral pressure relief valves are normally used to protect the pump from the
effects of increases in system pressure caused, for example, by a restricted or
closed discharge line. In response to a pressure increase the valve opens and
internally circulates the pumped media within the pump chamber.
When the valve opens, because the volume of fluid circulating is relatively
small, the temperature of the fluid in the pump chamber may rise if the pump
continues to operate for an extended period. In severe cases this may result in
temperatures in excess of the pumps operating limits or vaporisation of the
fluid. For these reasons when the valve is activated the cause of the system
pressure increase should be eliminated as continuous operation of the pump
with the valve open is not recommended and may cause severe damage to
the pump.
If the pump on which the valve is installed is to be installed in either a
pressurised system or one incorporating a vessel under vacuum, the
application of the valve should be referred to JPUK or their authorised
distributor. In addition where the pump is mounted onto a mobile unit with
drive, it is recommended that an integral pressure relief valve be installed.
Note: Care should be taken not to exceed the either the pumps
maximum pressure rating or the system design pressure.
The spring housing component including spring, stem and valve; are
manufactured as complete units and available in 7, 10 and 12 bar options.
This must be specified at time of order. If further adjustment is required to the
assemblies consult JPUK or your local JPUK distributor.
WARNING
WARNING