Assignee: Kerotest Manufacturing Corp.

Location: Pittsburgh, PA
No. of patents: 24

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Number	Title	Issue Date
5951902	Method and apparatus for electrofusing thermoplastic The present invention is directed to a method for creating an electrofused union between a plurality of thermoplastic members, with at least one of the members having an embedded electrically resistive element. The method includes the steps of generating ...	09/14/1999
5639394	Electrofusion formed valve assembly An electrofusion coupling having an encapsulated electrical resistance heating element for fusing together the ends of polyethylene conduit is converted into a valve body by drilling a bore through the wall of the coupling into the flow passage which form...	06/17/1997
5586749	Composite polyethylene and transition valve A valve body pressure formed from pipe components includes an annular portion for receiving a ball closure member. A pair of conduit portions are connected to the annular portion and the ball. A stem housing for rotatably supporting a valve stem extends u...	12/24/1996
5154396	Reinforced plastic valve A polyethylene plastic valve has a molded cylindrical body portion with an internal chamber with inlet and outlet openings. A unitary plastic plug member is rotatably positioned in the chamber. The plug member has an actuator portion formed of impact resi...	10/13/1992
5100103	Reinforced plastic valve A reinforced plastic valve includes a generally cylindrical major body portion which is at least partially formed of a plastic material. The major body portion has an axially extending interior chamber. A pair of flow lines intersect the major body portio...	03/31/1992
4988077	Reinforced plastic valve A reinforced plastic valve includes a generally cylindrical major body portion which is at least partially formed of a plastic material. The major body portion has an axially extending interior chamber. A pair of flow lines intersect the major body portio...	01/29/1991
4546662	Actuator mechanism for double bent bellows sealed rotary valve A valve body includes a chamber for the flow of fluid between an inlet and outlet thereto. A valve member, such as a ball valve member, is positioned in the chamber for rotation between an open position and a closed position to open and close the chamber....	10/15/1985
4540019	Bellows sealed stem for rotary valve A valve body includes a chamber for the flow of fluid between an inlet and outlet thereto. A valve member, such as a ball valve member, is positioned in the chamber for rotatable movement between an open position and a closed position to open and close th...	09/10/1985
4526341	Pneumatic shut-off valve A valve body includes a chamber for the flow of fluid between an inlet and an outlet thereto. The chamber includes an upper portion with an opening therethrough and a lower portion including a valve seat between the inlet and outlet. A bonnet is positione...	07/02/1985
4516754	Bent bellows sealed rotary valve A valve body includes a passageway for the flow of fluid therethrough. A valve member, such as a ball valve member, is positioned in the passageway for rotatable movement about a first rotational axis between an open position and a closed position to open...	05/14/1985
4513779	Metering valve A valve body includes a chamber for the flow of fluid between an inlet and an outlet thereto. The chamber includes an upper portion with an opening therethrough and a lower portion including a valve seat between the inlet and outlet. A bonnet is positione...	04/30/1985
4511120	Plastic service valve A valve includes a molded plastic body portion having an internal chamber with upper and lower portions. Fittings connect the valve to conduits of a piping system. A valve seat surrounds inlet and outlet openings in the chamber lower portion. A plastic pl...	04/16/1985
4488741	Compression coupling for service valve A valve includes a molded plastic body portion having an internal chamber forming a valve seat having inlet and outlet openings. A plastic plug member is rotatably positioned in the valve seat and has a flow passage which in the open position of the valve...	12/18/1984
4468002	Actuator mechanism for double bent bellows sealed rotary valve A valve body includes a chamber for the flow of fluid between an inlet and outlet thereto. A valve member, such as a ball valve member, is positioned in the chamber for rotation between an open position and a closed position to open and close the chamber....	08/28/1984
4465260	Plastic valve and improved actuator therefor A molded polyethylene valve body has a flow passage connecting an inlet with an outlet of the valve body. A valve seat formed integral with the valve body surrounds the passage and a plastic valve disc is rotatably positioned in the passage for movement i...	08/14/1984
4462422	Bellows sealed stem for rotary valve A valve body includes a chamber for the flow of fluid between an inlet and outlet thereto. A valve member, such as a ball valve member, is positioned in the chamber for rotatable movement between an open position and a closed position to open and close th...	07/31/1984
4452426	Bent bellows sealed rotary valve A valve body includes a passageway for the flow of fluid therethrough. A valve member, such as a ball valve member, is positioned in the passageway for rotatable movement about a first rotational axis between an open position and a closed position to open...	06/05/1984
4398754	Electrically insulated pipe coupling and method for making the same A connection between two pipes of a pipeline includes a pair of coupling members having externally threaded ends with sealing surfaces projecting from the ends. The threaded ends are advanced into opposite ends of an insulating sleeve fabricated of electr...	08/16/1983
4369813	Pipe stopper method and apparatus A hollow tubular body is welded to a distribution pipeline in surrounding relation with a cut-out portion of the pipeline. A plug assembly is inserted through an opened gate valve attached to the tubular body and into engagement with the tubular body. The...	01/25/1983
4354666	High pressure packless metal diaphragm valve A valve body has a chamber with a lower portion provided with inlet and outlet openings and an upper portion that includes a diaphragm seat having a surface with a presclected degree of roughness. An assembly of individual flexible metallic diaphragms is ...	10/19/1982
4348006	Plastic valve assembly A molded polyethylene valve body has a conduit portion and an annular portion extending upwardly from the conduit portion. A passageway extends through the conduit portion for the conveyance of fluid. A valve seat is formed in the conduit portion by a met...	09/07/1982
4231549	Valve stem and valve disc connection for a diaphragm valve A valve body has a valve seat in the lower portion of a valve chamber with inlet and outlet openings communicating with the chamber for the flow of fluid therethrough. A valve assembly has a valve disc arranged to move into and out of abutting relation wi...	11/04/1980
4151979	Diaphragm valve having a Belleville-spring assembly A valve member is axially supported for reciprocal movement within the lower portion of the chamber of a valve housing. The chamber lower portion is sealed from the chamber upper portion by a flexible diaphragm assembly. The valve member includes a cap ma...	05/01/1979
3982729	Back-up seal for diaphragm valve The diaphragm valve has a valve body portion with a chamber therein. The chamber has an open top portion and an inlet and outlet communicating therewith. The valve body has a valve seat in the chamber. The valve member is positioned in overlying relation ...	09/28/1976

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Assignee: Kerotest Manufacturing Corp.