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Class 251/168 - Screw


Subclass of Class 251 - Valves and valve actuation
Definition: Devices comprising threaded means between the valve face
No. of patents: 10
Last issue date: 12/09/2003


NumberTitleIssue Date
6659133Insertable line stopper plug for pipelines
This invention contemplates a resettable plug assembly suitable for insertion into a pipeline from a transverse tee connection in order that flow may be stopped and pressure retained by the plug. The stopper plug is inserted in the upstream direction and ...
12/09/2003
4570670Valve
A gate valve with inlet and outlet body portions with annular valve seats thereon and a gate assembly movable between open and closed positions between said body portions and carrying sealing rings in opposite faces thereof adapted to be brought into seal...
02/18/1986
4405113Reciprocating expandable gate valve
A valve body includes flow passageways across which a gate is movable with the gate having a central block sandwiched between outer seal blocks and a gate conduit alignable with the flow passageways of the valve body. Camming means along the edges of oppo...
09/20/1983
4347865Fabricated gate valves
A gate valve has a hollow substantially T-shaped housing having opposed tubular ends through which a pair of coaxial sleeves extend, the sleeves terminating in the interior of the housing in a pair of seats. A gate includes a pair of gate members which ar...
09/07/1982
4341369Expanding gate valve assembly
A gate valve (10) has an expanding gate assembly (34) for reciprocal movement transversely of the flow passage (16, 18). The expanding gate assembly (34) includes a gate element (68) and complementary segment (70) which expand away from each other when th...
07/27/1982
4179099Expanding gate valve
An expanding gate valve according to the present invention includes a gate system incorporating a pair of segments, one segment being formed to define opening cam surface means and the other segment being formed to define closed cam surface means. Spreade...
12/18/1979
4165858Gate valve structure
A gate valve in which a threaded movable rod supports a cam that serves as a mounting for first and second floating valve plates that are disposed back to back, which valve plates when the cam is in a first position may be moved adjacent to first and seco...
08/28/1979
4165063Linear retractable seal valve
A linear retractable seal valve having a wedge sealing-slip assembly slideably held at opposite side edges of the wedge to guide rails of the valve body and moveable from a distant first location to a second location between inlet and outlet ports of the ...
08/21/1979
4162057Linear retractable seal valve
A linear retractable seal valve having an inlet and outlet port and a fluid passageway therebetween with a lateral passageway perpendicular to the fluid passageway and with a wedge sealing-slip assembly slideably held at opposite side edges of the wedge t...
07/24/1979
4146209Gate valve
A through conduit gate valve having a carrier frame shiftable vertically in a valve chamber with gates mounted in the carrier frame as to be shiftable vertically in the carrier frame and as to be shiftable away from each other in the carrier frame. Means ...
03/27/1979
 
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