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Wilden pumps

Wilden pumps are positive displacement pumps – they move fluids using compartments or chambers with a variable volume. They have a reciprocating, or stroke-based, action; there is no rotary motion. There are few moving parts; usually only the diaphragms and the reciprocating shaft, driven by an air distribution unit, move to any significant degree.

The air distribution system [2] alternately pressurises each air chamber [1] compressing one diaphragm [9] into the liquid chamber [8] on each stroke and driving the horizontal piston [3 & 4] from side to side. As the diaphragm is released, enlarging the liquid chamber, fluid is drawn into the chamber through the corresponding inlet check ball valve [5].

The following compression stroke drives the fluid back out of the liquid chamber through the outlet check ball valve and into the discharge manifold [7]. The piston has then returned to its starting position, emptying the second chamber and completing one full cycle.

Since no electrical supply is needed to drive the unit, safety in hazardous environments is maximised. Operation in remote areas, where a portable compressor may be available, is possible.

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