Valves and valve actuation – Valve – Seats
Patent
1988-08-12
1989-11-14
Chambers, A. Michael
Valves and valve actuation
Valve
Seats
1374545, 1376142, F16K 2500
Patent
active
048802093
ABSTRACT:
A sealing washer for a tap top assembly of the type including an end housing containing a ceramic disc assembly, and for engagement with a valve seat within a tap body with the sealing washer normally engaging said ceramic disc assembly. The sealing washer is comprised of a ring of resilient compressible material surrounded by a sleeve of rigid material positioned whereby, in use, upon excessive compression of said resiliently compressible material a circumferentially extending flange on the sleeve will engage the end of the housing containing the ceramic disc assembly to retransmit the excessive compressive forces to the housing rather than the ceramic disc assembly. The radially inward side of the sealing ring has a circumferentially extending groove which, as fluid pressure increases, the force supplied on the underface formed by the groove increases proportionally to increase the sealing force of the ring against the ceramic disc assembly, while with decreasing fluid pressure, the sealing pressure decreases accordingly, thus ensuring that the sealing force at any time is only as much as is necessary to ensure adequate sealing.
REFERENCES:
patent: 3389717 (1968-06-01), Povalski et al.
patent: 4006883 (1977-02-01), Hilsheimer
patent: 4064904 (1977-12-01), Tolnai
patent: 4474208 (1984-10-01), Looney
Chambers A. Michael
Dorf Industries Pty. Ltd.
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