Fluid handling – Systems – Multi-way valve unit
Patent
1975-11-17
1977-02-01
Rosenthal, Arnold
Fluid handling
Systems
Multi-way valve unit
13762565, 251141, F16K 3106
Patent
active
040057330
ABSTRACT:
A differential pressure control valve is solenoid operated on a controlled duty cycle to alternately open and close a pair of inlets to establish a desired outlet pressure. The valve member acts as a solenoid armature. It is of sandwich construction with a magnetically soft center section and a thin, wear-resistant, nonmagnetic coating on one or both sides. The nonmagnetic coatings or layers are disclosed as being made of a nonmagnetic stainless steel, while the center section is disclosed as being made of a low carbon steel having a low magnetic remanence or residual magnetization. Valve life is increased due to the wear resistance of the stainless steel, and the nonmagnetic characteristic of the stainless steel layer adjacent the field plate avoids erratic retention of the valve member against the solenoid core and field plate. The arrangement is such that the magnetic forces across the valve member during solenoid energization act in parallel.
REFERENCES:
patent: 2267515 (1941-12-01), Wilcox et al.
patent: 2619116 (1952-11-01), Ralston
patent: 2860850 (1958-11-01), Rhodes et al.
patent: 2914034 (1959-11-01), Becker
patent: 2939673 (1960-06-01), Rosholt
patent: 3001757 (1961-09-01), Ball
patent: 3422850 (1969-01-01), Caldwell
patent: 3498330 (1970-03-01), Paige
patent: 3726315 (1973-04-01), Sheppard
patent: 3809123 (1974-05-01), Heimann
General Motors Corporation
McGraw D. D.
Rosenthal Arnold
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