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About pumps

About pumps

From Wikipedia:

A pump is a device that moves fluids (liquids or gases), or sometimes slurries, by mechanical action, typically converted from electrical energy into Hydraulic energy.

‘Pump’ Wikipedia Oct 2020

Pump types

Pumps can be classified into a number of categories depending on how they operate. One of the largest categories is positive displacement, which includes our pumps. There are several other types of pumps in this category, each suited to differing applications.

Diaphragm and ram pumps are almost identical in operation, differing only in the type of actuator used. The diaphragm or ram is moved backwards and forwards in a reciprocal motion to draw fluid into, and push fluid out of the pumping chamber. Valves are used to constrain the flow into one direction. The flow volume is driven by the displacement of the diaphragm or ram and the frequency of the reciprocating motion. In our pumps, as they are mainly driven by a geared motor, we refer to the RPM of the geared motor as the ‘speed’ of the pump.
As our pumps are driven by a reciprocating motion, we often recommend fitting surge arrestors (pulsation dampers) to our pumps. These help smooth out the flow, protecting the pump and pipework.

The main difference in application between our ram and diaphragm pumps are the pressures they can pump to. Our diaphragm pumps are ideally suited to lower pressure applications below 2.5 Bar (25m head) on the outlet. Our mechanical Mallard ram pumps can deliver pressures of up to 6 Bar (60m head), while their Hydraulic Mallet Cousins achieve 16Bar (160m head).


Our Pumps are built to last for many years with relatively low maintenance.  This is achieved by having relatively few moving parts, and making them strong, reliable and easy to replace should they go wrong. As always though, the more arduous the job, the more maintenance will be required.