Valves and valve actuation – With correlated flow path – Pipe end
Patent
1975-07-10
1976-12-21
Rosenthal, Arnold
Valves and valve actuation
With correlated flow path
Pipe end
251212, 251300, F16K 300
Patent
active
039984265
ABSTRACT:
An apparatus for controlling fluid discharge through an outlet of a conduit comprises a clamshell-type gate including first and second opposed gate members pivotally mounted to the exterior of the conduit. The gate members are oppositely rotatable through an arc of approximately 90.degree. between an open position and a closed position just downstream of the outlet. In the closed position, the gate members are closed together along a lip seal at the center of the conduit. A collar seal, mounted to the conduit, is urged against the gate members to block peripheral fluid discharge from the outlet. When the gate is fully or partially open, a portion of the outlet extends downstream of the lip seal to minimize "fan out" of the discharge. In the fully open position, the gate members are open symmetrically beyond the diameter of the outlet for unrestricted fluid discharge through the outlet. The gate members are pivotally attached to trunnion members at each side of the conduit through support arm plates. In one embodiment, the support plates contain elongated slots approximately perpendicular to the gate members that act as cam surfaces for controlling rotation of the gate members. Rotation of the gate members is caused by longitudinal movement of control shafts, guided by the trunnion members. The shafts are connected to follower pins that ride the elongated slots in the support arm plates to provide the camming action. This arrangement produces a closing torque that progressively increases during closure of the gate members. In another embodiment, the support arm plates are linked to opposite legs of yoke members on each side of the conduit. The gate members are rotated by longitudinal movement of the yoke members.
REFERENCES:
patent: 892944 (1908-07-01), Drawe
patent: 2742324 (1956-04-01), Kerensky
patent: 2785840 (1957-03-01), Nave
patent: 3123334 (1964-03-01), Hitz
Fraser Donald R.
Isbester Thomas John
Rosenthal Arnold
Sadowsky Gersten
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