Solenoid valve piston

Details Solenoid valve piston Solenoid valve piston

2000-06-23

2001-10-09

Fox, John (Department: 3753)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S041000

Reexamination Certificate

active

06299127

ABSTRACT:

THE FIELD OF THE INVENTION
The present invention relates to flush valves and in particular to flush valves in which there is hydraulic actuation of the valve member controlling flow between the flush valve inlet and outlet. Hydraulic actuators, whether they be manual or solenoid operated, use a piston which extends into the valve body of the flush valve for contact with the valve member. In prior art valves of this type there has been an elastomer seal ring on the exterior of the piston which bears against the chamber wall containing the piston. Other prior art shows a cup-type seal which performs a function similar to that of the elastomer seal. Both such valves are susceptible to failure from the seal being cut during assembly and by abrasion from solid particles in the water supply system. Also, both such valves required a bleed hole in the piston, which hole was prone to blockage.
The present invention is specifically directed at an improvement in the piston in the above-described environment. A split ring, in its free state having a diameter greater than that of the piston groove in which it resides, bears against the chamber wall as the piston moves. There is a radial force from the split ring, against the chamber wall, which provides consistent pressure, and thus consistent operation of the piston. Further, there is no need to have a perfect water-type seal and the piston split ring will provide controlled water communication about the piston as it moves during operation of the flush valve.
SUMMARY OF THE INVENTION
The present invention relates to flush valves for use with toilet devices such as urinals and water closets, and more specifically to a hydraulically operated flush valve.
A primary purpose of the invention is to provide a hydraulically operated flush valve with an improved piston having a split ring forming the movable contact between the piston and its surrounding chamber wall.
Another purpose of the invention is to provide a piston for the use described in which there is a controlled communication water passage about the piston as it moves.
Another purpose is to provide a piston for the use required having a piston ring which performs an imperfect water seal about the exterior of the piston providing controlled water communication about the piston as it moves.
Another purpose is to provide a piston and split ring as described having consistent contact pressure by the ring against the chamber or housing wall to provide consistent operation of the flush valve.
Another purpose is to provide a piston and piston ring as described, in which the friction between the piston ring and the mating housing is reduced, thereby permitting a reduced force for the restoring spring within the housing chamber.
Another purpose of the invention is to provide a piston construction as described which eliminates the failure modes of the prior art.
Other purposes will appear in the ensuing specification, drawings and claims.


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