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A control valve utilizing the conventional dual wafer check valve, which check valve has a pair of semicircular plates pivotally mounted about a pivot rod at the adjacent straight edge surfaces thereof. The plates are mounted by hinge brackets that allow initial translational movement of the pivoted

A control valve utilizing the conventional dual wafer check valve, which check valve has a pair of semicircular plates pivotally mounted about a pivot rod at the adjacent straight edge surfaces thereof. The plates are mounted by hinge brackets that allow initial translational movement of the pivoted edges of the plates before the rotation about the pivot shaft, so as to provide a clearance between the seal and plates at the pivoted edges. A control mechanism simultaneously and continuously controls the rotation of the wafer plates so that each plate rotates in opposite directions but the same arcuate distance. The control mechanism has a pair of levers with one lever pivoted to the rear surface of one of the plates, while their other ends are pivoted together at one end of a linear translational clevis member. The other end of the clevis member is connected to a pivotal cam follower via a lost-motion connection to convert rotary motion to translational motion. A handle and drive shaft accessible from outside of the valve body is provided to rotate the cam follower.

대표청구항 ▼

A control valve for controlling the bidirectional flow of a fluid through a conduit comprising: a main housing having a first end-flange for mounting to an end of a conduit, and a second end-flange spaced from said first end-flange for mounting to another end of a conduit in order to position the va

A control valve for controlling the bidirectional flow of a fluid through a conduit comprising: a main housing having a first end-flange for mounting to an end of a conduit, and a second end-flange spaced from said first end-flange for mounting to another end of a conduit in order to position the valve in a conduit system to control the flow of fluid therethrough; a pair of pivotal closure plates for controlling the flow of fluid through the valve, said pair of plates being mounted adjacent said first end-flange thereof for movement toward and away from said first end-flange; means for mounting said pair of closure plates for pivotal rotation about adjacent end-edges thereof, such that one of said pair of plates rotates in the counterclockwise direction, and the other of said pair of plates rotates in the clockwise direction; a first lever means operatively connected to each of said first and second closure plates, said first lever means being spaced from said first end-flange in said main housing, and comprising a first end thereof connected to each of said pair of closure plates for continuous connection therewith for all positions of said closure plates; and a second end; said first lever means being movable relative to said first end-flange for pivoting said pair of closure plates to a desired flow position; second lever means operatively connected to said second end of said first lever means for moving said first lever means relative to said first end-flange, to thus pivot said pair of closure plates, said second lever means being mounted in said main housing; control means operatively associated with said second lever means for controlling the movement thereof, and, therefore, the movement of said first lever means and said pair of closure plates; said control means comprising shaft means having a first end operatively connected with said second lever means in said main housing, and a second end remote from said first end projecting outwardly of said main housing, and means operatively connected to said second end of said shaft means for rotating said shaft means to position said pair of closure plates to a desired flow position, said means for rotating said shaft means comprising a handle means affixed to said second end of said drive shaft for conjoint rotation therewith, and handle-locking means for locking said handle means in a desired position determinate of the flow rate desired through the valve; said handle-locking means cooperating with a circumferential portion of said main housing for locking said handle means in place.