Pumps – Expansible chamber type
Patent
1981-09-21
1984-05-22
Freeh, William L.
Pumps
Expansible chamber type
92 865, F04B 3900
Patent
active
044498977
ABSTRACT:
A single-acting piston pump for output connection to a high pressure manifold and to an input of slush or slurry. The forward head of the piston pump is mounted for contact with the slush or slurry. In one embodiment, this forward head of the piston pump is mounted to the piston rod so as to be movable within limits, its rearward movement with respect to the piston rod opening a biased-closed valve either through the shaft of the piston or through a fixed rearward piston head. This valve opening leads to a clean fluid source at a pressure only slightly less than the high pressure manifold. There is a recess opening between the movable head and the piston shaft and in front of the fixed head in which clean fluid is always present. The movable head operates at a low pressure differential on both the forward and rearward movement of the piston stroke and the fixed head operates at all time in a clean fluid environment. Another embodiment includes two fixed heads and regulating means having a regulator connected between the working chamber of the main pump and a controlled clean fluid source for providing through a port in the rearward piston head low differential pressure to the forward head and a clean fluid environment to the rearward head.
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