Valve seat for piston-type flushometer

Details Valve seat for piston-type flushometer Valve seat for piston-type flushometer

2005-07-05

2005-07-05

Yu, Justine R. (Department: 3751)

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

C251S029000, C251S030010

Reexamination Certificate

active

06913239

ABSTRACT:
A flush valve includes a body having an inlet, an outlet and a main seat assembly between the inlet and outlet. A piston moves within the body and with the body defines a pressure chamber which is used to normally maintain the piston closed upon the main seat assembly. There is a refill orifice in the piston connecting the pressure chamber with the inlet. A relief valve is carried by the piston for venting the pressure chamber and there is a fluid driven apparatus for opening the relief valve, which apparatus is attached to the body. A hydraulic bypass in the body is connected to the fluid driven apparatus. The main seat assembly has a plurality of peripherally disposed fluid passages connecting the hydraulic bypass and the inlet to provide filtered fluid to the fluid driven apparatus. A first seal on the main seat assembly has a flat portion and an arcuate portion constrained within a channel. Lockout lugs formed in the seal prevent installation of an incorrectly sized piston.

REFERENCES:
patent: 3778023 (1973-12-01), Billeter
patent: 6299127 (2001-10-01), Wilson
patent: 6408873 (2002-06-01), Hall et al.

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