Cam seal butterfly valve

Claim 2

A butterfly valve comprising: a body having an axial flow passageway therethrough and a stem opening perpendicularly intersecting the flow passageway, said flow passageway being defined in part by an annular valve seat; a stem member rotatably and axially displaceably supported in said body stem opening and extending within said flow passageway; a valve disc member of generally planar configuration positioned in said flow passageway and movable between a closed position in which the plane of the disc is perpendicular the axis of the flow passageway and an opened position in which the plane of the disc is parallel the axis of the flow passageway, the valve disc having a forward face and a sealing face, the valve disc member being defined in part by a peripheral sealing surface on said forward face which sealably engages said body annular valve seat when the disc is in closed position; stem-actuating means external of said body for rotating and axially displacing said stem member; spaced-parallel boss portions extending rearwardly and perpendicularly from said disc member rearward surface and to either side of said stem member, said boss portions having a slot therein each aligned with the other and each in the same plane inclined at an angle to the planar disc member; and a guide pin, said stem member having an opening therethrough perpendicular the stem member axis, said guide pin being received in said opening in said stem member an slidably received in each of said slots in said disc member boss portions.

Claim 3

A butterfly valve according to claim 1 wherein said means of rotating and axially displacing said stem member comprises: cam means operably positioned between said stem member and said valve body for the rotation of said stem member 90* in one rotational direction when said stem member is axially displaced in the direction of said valve body and for rotation of said stem member 90* in the opposite rotational direction when said stem member is axially displaced in the direction away from said valve body.

Claim 4

A valve comprising: a body having an axial flow passageway therethrough and a stem opening intersecting the flow passageway, said flow passageway being defined in part by an annular valve seat; a stem member rotatably and axially displaceably supported in said body stem opening and extending within said flow passageway; a valve member positioned in said flow passageway and movable between a closed position in which the valve member closes said passageway and an opened position in which said passageway is opened, the valve member having a forward portion and a rearward portion, the valve member being defined in part by a peripheral sealing surface on said forward portion which sealably engages said body annular valve seat when the member is in closed position; stem-actuating means external of said body for rotating and axially displacing said stem member; spaced-parallel boss portions extending rearwardly and perpendicular from said valve member rearward portion and to either side of said stem member, each of said boss portions having a slot therein each aligned with the other and each in the same plane inclined at an angle to the axis of the stem member; and a guide pin, said stem member having an opening therethrough perpendicular the stem member axis, said guide pin being received in said opening in said stem member and slidably received in each of Said slots in said valve member boss portions whereby the rotation of said valve stem rotates said valve member, and the axial displacement of said valve stem in one direction displaces said valve member away from said stem member and toward said body valve seat and the displacement of said valve stem in the opposite direction displaces said valve member towards said stem member and away from said valve body.

Claim 5

A valve comprising: a body having an axial flow passageway therethrough and a stem opening intersecting the flow passageway, said flow passageway being defined in part by an annular valve seat; a stem member rotatably and axially displaceably supported in said body stem opening and extending within said flow passageway; a valve member positioned in said flow passageway and movable between a closed position in which the valve member closes said passageway and an opened position in which said passageway is opened, the valve member having a forward portion and a rearward portion, the valve member being defined in part by a peripheral sealing surface on said forward portion which sealably engages said body annular valve seat when the member is in closed position; stem-actuating means external of said body for rotating and axially displacing said stem member; spaced-parallel boss portions extending rearwardly and perpendicular from said valve member rearward portion and to either side of said stem member, each of said boss portions having a slot therein each aligned with the other and each in the same plane inclined at an angle to the axis of the stem member; and a guide pin, said stem member having an opening therethrough perpendicular the stem member axis, said guide pin being received in said opening in said stem member and slidably received in each of Said slots in said valve member boss portions whereby the rotation of said valve stem rotates said valve member, and the axial displacement of said valve stem in one direction displaces said valve member away from said stem member and toward said body valve seat and the displacement of said valve stem in the opposite direction displaces said valve member towards said stem member and away from said valve body.

Claim 6

A valve according to claim 3 wherein said means of rotating and axially displacing said stem member comprises: cam means operably positioned between said stem member and said valve body for the rotation of said stem member 90* in one rotational direction when said stem member is axially displaced in the direction of said valve body and for rotation of said stem member 90* in the opposite rotational direction when said stem member is axially displaced in the direction away from said valve body.

Claim 7

A valve according to claim 3 wherein said means of rotating and axially displacing said stem member comprises: a cam member having an opening therein rotatably receiving said stem member exterior of said body, said cam member being nonrotatably supported to said body, said cam member having a cam slot therein; a guide pin, said stem member having a guide pin opening therein radial the axis thereof and external of said body, said guide pin being received in said guide pin opening and by said cam slot in said cam member; and means of axially displacing said stem member, said cam member cam slot being configured such that the action of said guide pin by said cam slot rotates said stem member 90* in one rotational direction when said stem member is axially displaced in the direction of said valve body and rotates said stem member 90* in the opposite direction when said stem is axially displaced in the direction away from said valve body.

Claim 8

A butterfly valve according to claim 5 wherein said means of axially displacing said stem member comprises: a drive gear having an internally threaded axial opening therein, said stem member having an externally threaded portion external of said body threadably receiving said drive gear; housing means secured to said valve body and rotatably receiving said stem member, said housing means rotatably and nonaxially displaceably supporting said drive gear; and means of rotating said drive gear.