Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1994-12-01
1996-01-30
Schwadron, Martin P.
Fluid handling
Line condition change responsive valves
Direct response valves
137529, 25112921, 335274, F16K 1500, F16K 3102
Patent
active
054874076
ABSTRACT:
A valve assembly having a first condition for blocking system fluid flow when system fluid pressure differential across the valve assembly is in a given range above a predetermined pressure differential and a second condition for permitting system fluid flow in one direction when system fluid pressure differential across the valve assembly is greater than the predetermined pressure. The valve comprises a valve housing, a valving member within the housing, a solenoid assembly, first and second springs for exerting force on the valving member and a solenoid energizing circuit. The valve housing defines a fluid flow inlet, a fluid flow outlet and supports a valve seat between the inlet and outlet. The valving member comprises a valving element positioned for engagement with the valve seat and a stem element fixed to and projecting from the valving element. The valving element is movable between an open position spaced from the valve seat for enabling fluid flow through the housing and a closed position engaged with the valve seat. The solenoid assembly comprises an armature movable with respect to the valving member and the housing. The solenoid assembly has an energized condition in which the armature is subjected to an electromagnetic force. The first and second springs coact to produce a net spring force maintaining the valving member in one of its positions when of system fluid pressure tending to shift the valving member toward the other position is in the range when the solenoid is de-energized. The solenoid is energized to shift the armature for substantially reducing the net spring force applied to the valving member thus enabling system fluid pressure forces above the predetermined force to shift the valving member toward the other position.
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Lee Kevin L.
Robertshaw Controls Company
Schwadron Martin P.
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