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5
Functional description
Pump
Hydraulic end
The metering pump is an oscillating diaphragm pump, the stroke length of
which can be adjusted.
The hydraulic end has a bleed valve (2), a fixed pressure limitation valve
(3) and optionally an overpressure signaller (1). The bleed valve (2) con‐
tinuously bleeds the hydraulic end. The pressure limitation valve (3) pro‐
vides protection for the pump power end and the diaphragm if the liquid
feed pressure becomes too high. If the discharge side of the liquid end is
blocked, the pressure limitation valve (3) opens at a pre-set pressure and
allows the hydraulic oil to flow into the power end housing.
This does not guarantee protection of the system against overpressure! A
relief valve should nevertheless be fitted in the case of the ATEX pump!
Above a heightened overpressure, the overpressure signaller (1) switches.
Fig. 5: Overview of hydraulic end HP4
Functional description
1
2
3
P_HY_0034_SW
31
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