Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Patent
1998-06-30
1999-11-30
Rivell, John
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
251 3002, 251 33, 417307, F16K 3140, F04B 49035
Patent
active
059924500
ABSTRACT:
A pump assembly (33) including a cartridge valve assembly (39) having a poppet member (69) biased toward a closed position (FIG. 4) when a pilot portion (51) is closed, under the influence of an electromagnetic actuator (53), so that flow entering an inlet port (65) flows out an outlet opening (61). When the actuator (53) is not energized (FIG. 1), a pilot poppet (89) and armature (93) are biased to an open position (FIG. 5) by a pilot spring (94), so that fluid in the inlet port (65) flows through an orifice (71) in the poppet member (69) and through the pilot portion (51) to a system reservoir (R), creating a pressure differential across the poppet member (69), and opening a tank port (67). Flow is then from the inlet port (65) to the tank port (67), thus operating in a "bypass" mode. Under excessive inlet pressure, the pilot portion (51) also serves a pressure relief function.
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Bigaouette Terence J.
Carlin Jerry F.
Lantsberg Gregory F.
Parker Scott M.
Singh Rodney V.
Eaton Corporation
Kasper L. J.
Rivell John
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