Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1997-09-25
1999-03-16
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
138 45, 251121, F16K 31143, F16K 4702
Patent
active
058819932
ABSTRACT:
A flush valve includes a body with an inlet, an outlet, a valve seat at the outlet, and a piston movable in the body toward and away from the valve seat to control flow through the outlet. The piston has a chamber and there is a refill orifice in the piston connecting the chamber with the body inlet. Pressure in the chamber maintains the piston closed upon the valve seat. A relief valve in the piston vents the chamber to the outlet to permit the piston to move away from the valve seat to open flow from the inlet to the body outlet. The piston has a guide portion which extends downstream of the valve seat when the piston is in the closed position. The guide portion of the piston has a plurality of outwardly extending axial ribs, the outer surface of which is radially in alignment with the path of flow through said valve seat. The piston area between the ribs is closed by a skirt to confine the path of flow exteriorly of the piston portion to provide a defined flow path through the valve seat from the inlet to the outlet.
REFERENCES:
patent: 1756263 (1930-04-01), Sloan
patent: 1830005 (1931-11-01), Sloan
patent: 2007652 (1935-07-01), Kocour
patent: 2082226 (1937-06-01), Stafford
patent: 2136221 (1938-11-01), Sloan
patent: 2369104 (1945-02-01), Fredrickson
patent: 2406259 (1946-08-01), Russell et al.
patent: 2472576 (1949-06-01), Dobrick
patent: 3207467 (1965-09-01), Buhler
patent: 3279742 (1966-10-01), Billeter
patent: 4261545 (1981-04-01), Allen
patent: 5415374 (1995-05-01), Carroll et al.
Carroll Daniel J.
Wilson John R.
Sloan Valve Company
Walton George L.
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