Plug valve construction and operating mechanism

Claim 2

A duplex valve construction comprising casing structure having a pair of valve plug cavities tapered in opposite directions each having valve ports in the casing structure, a tapered valve plug seating in each valve cavity and having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, and tapered cavities and tapered plugs being aligned along a common axis, means connected to the plugs to seat the plugs in the cavities by axial seating movement in opposite directions, the means for moving the valve plugs in their seating directions including adjustable means providing for seating of each plug by reaction against the other plug.

Claim 3

A valve construction as defined in claim 1 in which the valve seating means comprises threaded nut and screw jack devices of opposite thread hand interconnecting the valve plugs, and an operating shaft connected to said jack devices and rotative about the common axis of the valve plugs.

Claim 4

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structure, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being aligned along a common axis and having their smaller ends presented toward each other so that the two valves seat in the cavities by axial seating movement in directions toward each other, and means connected to the valve plugs for moving the valve plugs toward each other to seat the plus in the cavities including adjustable means providing for seating of each plug by reaction against the other plug.

Claim 5

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structure, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being aligned along a common axis and having their smaller ends presented toward each other so that the two valves seat in the cavities by axial seating movement in directions toward each other, and means connected to the valve plugs for moving the valve plugs toward each other to seat the plus in the cavities including adjustable means providing for seating of each plug by reaction against the other plug.

Claim 6

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structure, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being alignment along a common axis and having their smaller ends presented toward each other so that the two valves seat in the cavities by axial seating movement in direction toward each other, and means connected with the valve plugs for moving the valve plugs toward each other to seat the plugs in the cavities including screw jack means having cooperating screw threaded parts relatively rotatable about said common axis of the valve plugs and positioned and reacting between the valve plugs to effect seating thereof.

Claim 7

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structure, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being alignment along a common axis and having their smaller ends presented toward each other so that the two valves seat in the cavities by axial seating movement in direction toward each other, and means connected with the valve plugs for moving the valve plugs toward each other to seat the plugs in the cavities including screw jack means having cooperating screw threaded parts relatively rotatable about said common axis of the valve plugs and positioned and reacting between the valve plugs to effect seating thereof.

Claim 8

A valve construction as defined in claim 4 in which parts of the screwjack means are mounted with freedom for movement transversely of said common axis to accommodate misalignment of the valve plug cavities and valve plugs with respect to each other or with respect to said common axis.

Claim 9

A valve construction as defined in claim 4 and further including an operating shaft for the screwjack means, the shaft being positioned coaxially of said common axis of the valve plugs.

Claim 10

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structUre, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being aligned along a common axis and having their smaller ends presented toward each other so that the two valves seat in the cavities by axial seating movement in directions toward each other, means connected with the valve plugs for seating and lifting the valve plugs comprising, for each plug, a screwjack device having a screw part and a nut part, the screw parts of the two devices being interconnected and rotatable about said common axis of the valve plugs, the screw jack devices for the two valve plugs having screw threads of opposite hand, and for each valve plug means connected therewith for restraining rotation of the associated nut part of the screw device with respect to the valve plug and abutment means also fixed with respect to the valve plug and against which the nut part reacts axially of the valve plug to effect seating or unseating of the valve plug.

Claim 11

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structUre, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being aligned along a common axis and having their smaller ends presented toward each other so that the two valves seat in the cavities by axial seating movement in directions toward each other, means connected with the valve plugs for seating and lifting the valve plugs comprising, for each plug, a screwjack device having a screw part and a nut part, the screw parts of the two devices being interconnected and rotatable about said common axis of the valve plugs, the screw jack devices for the two valve plugs having screw threads of opposite hand, and for each valve plug means connected therewith for restraining rotation of the associated nut part of the screw device with respect to the valve plug and abutment means also fixed with respect to the valve plug and against which the nut part reacts axially of the valve plug to effect seating or unseating of the valve plug.

Claim 12

A valve construction as defined in claim 7 in which the abutment means for each valve plug comprises abutment surfaces spaced from each other at opposite ends of the associated nut part, the spacing being sufficient to provide limited movement of the nut part without moving the valve plug and thereby provide for independent seating of the two valve plugs.

Claim 13

A valve construction comprising casing structure having a tapered valve plug cavity, with three valve ports in the casing structure two of which ports are located diametrically opposite to each other and the third is located midway between the first tow ports, each of said ports being of circular cross section and of substantially the same diameter, a tapered valve plug in the valve cavity having a valve passage therethrough of the shape of the passage in a 90* pipe elbow and of substantially the same inside diameter as that of the valve ports, the valve plug being angularly movable between positions interconnecting said third port with either of said first two ports, and means connected with the valve plug for seating and unseating the valve plug in the valve cavity in the casing structure.

Claim 14

A valve construction comprising casing structure having a tapered valve plug cavity, with three valve ports in the casing structure two of which ports are located diametrically opposite to each other and the third is located midway between the first tow ports, each of said ports being of circular cross section and of substantially the same diameter, a tapered valve plug in the valve cavity having a valve passage therethrough of the shape of the passage in a 90* pipe elbow and of substantially the same inside diameter as that of the valve ports, the valve plug being angularly movable between positions interconnecting said third port with either of said first two ports, and means connected with the valve plug for seating and unseating the valve plug in the valve cavity in the casing structure.

Claim 15

A duplex valve construction comprising casing structure having pair of axially aligned tapered valve plug cavities each having three valve ports in the casing structure with two of the ports located diametrically opposite to each other and with the third port located midway between the first two ports, each of said ports being of circular cross section and of substantially the same diameter, a tapered valve plug in each valve cavity each having a valve passage therethrough of the shape of the passage in a 90* pipe elbow of substantially the same inside diameter as that of the valve ports, the valve plugs being angularly movable between positions interconnecting said third port with either of said first two ports, and means connected with the valve plugs for concurrently moving the two valve plugs between said positions.

Claim 16

A duplex valve construction comprising casing structure having pair of axially aligned tapered valve plug cavities each having three valve ports in the casing structure with two of the ports located diametrically opposite to each other and with the third port located midway between the first two ports, each of said ports being of circular cross section and of substantially the same diameter, a tapered valve plug in each valve cavity each having a valve passage therethrough of the shape of the passage in a 90* pipe elbow of substantially the same inside diameter as that of the valve ports, the valve plugs being angularly movable between positions interconnecting said third port with either of said first two ports, and means connected with the valve plugs for concurrently moving the two valve plugs between said positions.

Claim 17

A valve construction as defined in claim 10 and further including means connected with the valve plugs for concurrently unseating both valve plugs and for concurrently seating both valve plugs.

Claim 18

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structure, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being aligned along a common axis and being so positioned along said common axis that the two valves seat in the cavities by axial seating movement in opposite directions, and means connected with the valve plugs for moving the valve plugs in their seating directions including threaded nut and screwjack devices associated with the valve plugs.

Claim 19

A duplex valve construction comprising casing structure having a pair of tapered valve plug cavities each having valve ports in the casing structure, a tapered valve plug in each valve cavity having a valve passage and being angularly movable between different positions for controlling the flow between cavity ports, the tapered cavities and tapered plugs being aligned along a common axis and being so positioned along said common axis that the two valves seat in the cavities by axial seating movement in opposite directions, and means connected with the valve plugs for moving the valve plugs in their seating directions including threaded nut and screwjack devices associated with the valve plugs.

Claim 20

A vaLve construction as defined in claim 12 in which the screwjack devices are located between the valve plugs, and an operating shaft for said jack devices rotative about the common axis of the valve plugs and extended from the region between the valve plugs through one of said plugs.

Claim 21

A valve construction as defined in claim 12 in which the screwjack devices are located adjacent the remote ends of the valve plugs, and an operating shaft for said jack devices is extended through the valve plugs and interconnects the screws of said devices.

Claim 22

A valve construction as defined in claim 12 in which the screw jack devices are located one intermediate the two valve plugs and the other at the outer end of one of the valve plugs.