Changeover valves with bypass and bent valving
First Claim
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1. Apparatus comprising:
- a plug valve and first and second auxiliary valves mounted to said plug valve;
said plug valve comprising a valve body having a chamber for receiving a valve plug and at least a first port and a second port communicating with said chamber, first and second openings in said valve body intersecting said first and second ports respectively, and a valve plug rotatably mounted in said chamber, said valve plug having a passageway for controlling flow of fluid through said valve body via said first and second ports;
said auxiliary valves each comprising a stem having a stop portion which is disposed in one of said openings and is adapted to close off said one opening when said stem is in a first position and to open said one opening when said stem is in a second position, and means for moving said stem axially between said first and second positions; and
means connecting said first and second openings so that fluid can bypass said valve plug when the stems of said bypass valves are in said second positions.
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Abstract
Changeover valves are provided for a dual filter system which are characterized by auxiliary bypass and vent valving to facilitate changing over from one filter to the other. The bypass valving allows a process fluid to fill the second filter while the first is still in service and without a substantial reduction in process fluid flow or pressure to downstream equipment; and the vent valving permits elimination of air or gases from the second filter before it is put into service.
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Citations
22 Claims
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1. Apparatus comprising:
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a plug valve and first and second auxiliary valves mounted to said plug valve; said plug valve comprising a valve body having a chamber for receiving a valve plug and at least a first port and a second port communicating with said chamber, first and second openings in said valve body intersecting said first and second ports respectively, and a valve plug rotatably mounted in said chamber, said valve plug having a passageway for controlling flow of fluid through said valve body via said first and second ports; said auxiliary valves each comprising a stem having a stop portion which is disposed in one of said openings and is adapted to close off said one opening when said stem is in a first position and to open said one opening when said stem is in a second position, and means for moving said stem axially between said first and second positions; and means connecting said first and second openings so that fluid can bypass said valve plug when the stems of said bypass valves are in said second positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Apparatus comprising a main valve and first and second auxiliary valves mounted to said main valve;
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said main valve comprising a valve body with at least first, second and third ports, first and second openings in said valve body intersecting said first and second ports respectively, means defining first and second valve seats in said valve body for said first and second openings respectively, and flow control means for selectively controlling flow of fluid through said valve body between said third port and said first and second ports; said first and second auxiliary valves each comprising a stem with a valve head, the stems of said first and second auxiliary valves being disposed so that said valve heads engage said first and second seats and block off said first and second openings respectively when said stems are in a first position and are disengaged from said first and second seats and unblock said first and second openings respectively when said stems are in a second position, and means for moving said stems from one to the other of said first and second positions. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. Apparatus comprising a main valve and first and second auxiliary valves;
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said main valve comprising a valve body with at least first, second and third ports, and flow control means for selectively controlling flow of fluid through said valve body between said third port and said first and second ports; said first and second auxiliary valves each comprising a stem with a valve head, and means for axially and non-rotatably reciprocating said stem; and means defining first and second openings in said valve body communicating with said first and second ports respectively, and means defining first and second valve seats in said valve body for the valve heads of said first and second auxiliary valves respectively; the stems of said first and second auxiliary valves being disposed in said first and second openings respectively so that the valve heads of said first and second auxiliary valves engage said first and second valve seats respectively and block off said first and second openings respectively when said stems are in a first position and are disengaged from said first and second valve seats respectively and unblock said first and second openings when said stems are in a second position.
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Specification