Abstract: A technology is described to allow the controlled ingress and egress of air through a prosthetic socket by the insertion of a mechanical valve. The air flow through the valve is controlled by a toggle switch that moves a magnet to shift the position of a valve stem or valve obstruction in the valve. The normal, or closed, position allows flow out of the socket for donning and walking. The open position allows for free flow of air for donning or doffing.

Abstract: An isolation tool for temporarily isolating a section of pipeline has foldable semi-circular sealing element halves that, when unfolded, combine to form a primary and secondary sealing element. The element halves unfold by rotating an inner bar about an outer bar. A bleed hole permits any fluid which leaks past the primary sealing element and into the annular space between the sealing elements to enter a longitudinal bleed passageway located within the tool itself, thereby eliminating the need for a bleed port or valve to be welded onto the pipeline. The tool, which is pressure balanced, is well adapted for use in applications in which the lateral access opening is significantly smaller in diameter than the pipe diameter.

Abstract: An excess flow valve (EFV) for installation in a service line of natural gas distribution system serving an existing structure. The EFV has a cylindrical housing having a first length and a second length and a through hole therethrough for passage of gas. The EFV 11 engaged in the through hole of the first length and the second length has an expandable wall which can be expanded and fixed in said service line.

Abstract: A tool for extracting a plug from a pipe containing a pressurized gas is provided. The tool includes a chamber member having an open end and a closed end, the closed end having a bore therethrough. An extractor member is provided having a handle on one end and a shaft portion extending through the bore. The shaft portion has at least first threaded portion opposite the handle and a second threaded portion adjacent the closed end. A lifting member is operably coupled to the second threaded portion.

Abstract: An excess flow valve (EFV) for installation in a service line of natural gas distribution system serving an existing structure. The EFV has a cylindrical housing having a first length and a second length and a through hole therethrough for passage of gas. The EFV 11 engaged in the through hole of the first length and the second length has an expandable wall which can be expanded and fixed in said service line.

Abstract: The present invention provides a method and apparatus for removing a test plug from a vent when positioned at a remote location with respect to the vent. The apparatus includes a cover having a handle section and base, the cover being visible from a remote location with respect to the vent. The apparatus further includes a retainer coupled to the cover by a connecting sleeve. The test plug is maintained between the cover and retainer and is removable from the vent by forcibly engaging the apparatus with a retrieval device configured to extend from the remote location to the vent.

Abstract: A valve includes a valve body with a hollow valve body interior and an opening-defining portion that defines an access opening. The opening-defining portion is arranged as a connection-facilitating structure for facilitating the fluid-tight connection of a separate isolation valve assembly to the opening-defining portion in a position over the access opening that enables removal and replacement of a valve-stopping mechanism from the valve through the isolation valve assembly. It may include a flange, exterior thread, one or more annular grooves or rings, and/or a segmented cam lock arrangement.

Abstract: Adaptor assemblies are detailed. Preferably for connecting automatic pool cleaning apparatus to return lines of swimming pool water-circulation systems, the assemblies utilize spurs that may affirmatively grip, or cut or gouge into, the return lines to retain the adaptors in position. Releasing the adaptors may occur with use of a release line which retracts the spurs when activated. Avoiding release of the spurs through rotation of the assemblies allows rotation for other purposes as, for example, to connect the device to a hose or other apparatus. A bellows or other assembly additionally may be included with the assemblies to facilitate their sealing against walls or other surfaces in which the return lines are embedded.