Hydra-Cell pumps incorporate a replenishment valve in every piston assembly which operates on the suction stroke
, thus ensuring optimum actuating oil volume on every diaphragm pressure stroke to provide superior accuracy.
In figure 1A, the piston is at the end of the suction stroke about to start compression and in figure IB, the compression stroke has just been completed.
Figure 2 A shows the compressor with the piston and attached HARS retracted at the end of the suction stroke, and figure 2B shows the compressor with the piston and attached HARS fully inserted at the end of the compression stroke.
The water mains pressure needs to be only a little higher than the suction pressure, as the check valve will prevent reverse flow when the cylinder is at high pressure, and the top-up fill can occur on the suction stroke. An automatic water drain is provided inside the coalescer, so that if too much water collects, it can be drained away.
* Liquid chamber--separated from the compressed air by the diaphragms, it fills with process fluid during the suction stroke
and is emptied during the discharge stroke.
This is the suction stroke
. The diaphragm pushes the control rod until the poppet valve closes the air exhaust port.
On the other hand, due to the reduction of full cylinder volume, the amount of air intake, in the suction stroke will decrease and lead to incomplete combustion of fuel and as a result CO, HC emission will increase.
Hence due to increase of compression ratio, even though the amount of air available for combustion in the suction stroke decreases, the inbuilt oxygen caused for proper combustion and caused for reduction in pollutants.
The limit switch is actuated by means of a bolt attached to the inlet valve rocker; we effectively have utilized the 8mm travel of the rocker arm for generating the electrical signal for initiating the injection during the suction stroke.
The manifold injection starts 61.239 deg after TDC during the suction stroke
At the end of its suction stroke
, a control rod attached to the diaphragm blocks the outlet on the venturi, diverting air onto the back of the diaphragm creating the discharge stroke.