Pumps – Motor driven – Fluid motor
Patent
1980-09-05
1982-10-12
Smith, Leonard E.
Pumps
Motor driven
Fluid motor
1375123, 137540, F04B 4306, F16K 500
Patent
active
043536840
ABSTRACT:
The pressure limiting device is used with a diaphragm pump for controlling the forces applied to the diaphragm. The device includes a body having a pressure control chamber therein. The body has an inlet to the chamber which is adapted to be coupled to a working chamber in the diaphragm pump. The body is provided with a first outlet opening from the control chamber and the body has therein a first poppet valve including a first valve seat at the first outlet opening facing into a larger cross-section first poppet-valve chamber. A first poppet is positioned in the first poppet valve chamber and engages the first valve seat. A spring assembly is situated in the first poppet valve chamber for urging the first poppet against the first valve seat at a first predetermined force. An outlet opening from the first poppet-valve chamber is adapted to be connected to a sump for the working liquid. In the body the pressure control chamber has a second outlet opening and a second poppet valve within the body including a second valve seat at the second opening facing into a larger cross-section second poppet-valve chamber. A second poppet is positioned in the second poppet-valve chamber and engages at one end thereof the second valve seat. Another spring assembly is situated in the second poppet-valve chamber for urging the second poppet against the second valve seat at a second predetermined force. The body has a bore in which a pin is received for acting on the second poppet and the pressure of the pumped fluid is applied to the outer end of the pin to urge the pin against the second poppet to provide additional force on the second poppet. An outlet from the second poppet-valve chamber communicates with the first poppet-valve chamber for coupling the second poppet-valve chamber to the sump for the working liquid. The second poppet-valve is opened at low pressures of the pumped fluid by the working liquid acting thereagainst with the first poppet-valve being opened at high pressures of the pumped fluid by the pressure of the working liquid acting thereagainst to relieve pressurized fluid from the working compartment thereby to limit the forces placed on the diaphragm at low pressures of the pumped fluid and high pressures of the working liquid.
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Gordon Herman L.
Smith Leonard E.
Superpressure, Inc.
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