Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1993-03-26
1994-08-30
Fetsuga, Robert M.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
25112912, 4DIG3, F16K 3104, F16K 3112
Patent
active
053420241
ABSTRACT:
An automatic flushing device for a urinal has a sensor, a valve assembly for water supply and a control circuit board. The valve assembly comprises a housing having a chamber for receiving a valve, and a chamber for receiving a valve drive. The housing also has an inlet socket and an outlet socket. The valve has a sleeve with an upper portion of a small diameter and a lower portion of a large diameter and an open bottom. The sleeve has inlet port in the upper side wall and a inlet hole in the top portion. A piston is arranged in a reciprocating manner within the upper portion of the sleeve. The piston has an upper piston section provided with a plurality of inlets and a lower piston section provided with an outlet. A relief valve is mounted within the outlet of the piston. A truncated cone spring presses the relief valve down into its closed position. A coil spring installed between the upper piston section and the top portion of the sleeve biases the piston in a downward direction against a bushing. A valve drive comprises a motor, a camshaft having a cam at the front end, a power transmission gear system between the shaft of the motor and the camshaft, a sensor element attached to the rear of the camshaft, and a photo interrupter interacting with the wings of the sensor element and provided with a sensor unit. The actuator pin of the valve is actuated by the cam.
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