Valves and valve actuation – Reciprocating valve – Gate
Patent
1982-04-08
1984-11-20
Schwadron, Martin P.
Valves and valve actuation
Reciprocating valve
Gate
251328, F16K 3314
Patent
active
044835140
ABSTRACT:
A gate member for a gate valve provides improved sealing by providing for proper orientation of the gate member as it approaches its closed position and then providing improved sealing action as the gate member is closed further. A lip on the gate member overlaps a ledge on the valve body at the opening where the gate member enters the valve chamber. The lip is covered by a seal of resilient material having a cross-sectional shape that cooperates with the valve body to orient the gate member and that controls the compression of the seal between the lip and ledge as the gate member closes further. The shape of the gate member also helps to orient it while it is closing. A spine and a ridged cap of resilient material on the leading edge of the gate member cooperate to prevent blow-by of pressurized fluid when the gate member is closed. Pads integral with the seal contact the corners of the opening initially to orient the gate member and then to fill the corners when the gate member is closed further.
REFERENCES:
patent: 3662778 (1972-05-01), Leopold, Jr. et al.
patent: 3746304 (1973-07-01), Matthias
patent: 4162058 (1979-07-01), Ellis
International Telephone and Telegraph Corporation
O'Halloran John T.
Ruzek Peter R.
Schwadron Martin P.
Shay James R.
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