The air distribution system  alternately pressurises each air chamber  compressing one diaphragm  into the liquid chamber  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 .
The following compression stroke drives the fluid back out of the liquid chamber through the outlet check ball valve and into the discharge manifold . 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.