Pumps – Expansible chamber type – Having pulsation dampening fluid receiving space
Patent
1997-01-24
1998-06-30
Freay, Charles G.
Pumps
Expansible chamber type
Having pulsation dampening fluid receiving space
138 30, F04B 1100
Patent
active
057724148
ABSTRACT:
A pressure equalizer for use with a reciprocating pump provides a liquid accumulation region to facilitate precise control over the amount of liquid discharged from the pump, and provides a short duration pressure spike to facilitate complete discharge of the liquid from the pump and associated components. The equalizer includes a housing mountable to the pump, in fluid communication with the pump internals. A variable volume assembly, including an isolation member, such as a flexible diaphragm, is carried by the equalizer housing and is in fluid communication with the pump. The diaphragm is adapted to expand outwardly and contract inwardly in conjunction with an increase and a decrease in pressure in the pump. Each the outward expansion and inward contraction are within a predetermined, preset range of movement. The equalizer includes a retaining member which is engageable with the diaphragm, and at least one biasing element positioned on the retaining member, operably connected to the diaphragm. The biasing element is adjustable to set the outward expansion range of movement of the diaphragm, and the inward contraction range of movement of the diaphragm. The diaphragm expands within the preset range of movement in response to an increase of pressure in the pump to define the accumulation region and to accumulate a predetermined amount of liquid therein. The diaphragm contracts within the preset range of movement in response to a decrease of pressure in the pump to discharge the accumulated liquid therefrom.
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Freay Charles G.
Tetra Laval Holdings & Finance S.A.
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