The present disclosure provides gas valve assemblies that include a replaceable excess flow valve within a movable flow control body that is removably secured within a valve seat housing. The gas valve assemblies permit the replacement of an excess flow valve without interrupting the supply of gas to a structure and without replacing gas piping.

A backflow prevention assembly is disclosed including a backflow prevention valve having a valve housing including a valve inlet end and a valve outlet end; a spool spacer of predetermined length having a first end and a second end; an inlet shut-off valve; and an outlet shut-off valve, wherein the spool spacer extends between the backflow prevention valve and one of the inlet shut-off valve and the outlet shut-off valve. The entire assembly, including the backflow prevention valve, the spool spacer, the inlet shut-off valve, and the outlet shut-off valve, is a certified assembly, certified by a certifying authority prior to installation. Methods of manufacturing a backflow prevention assembly and replacing a backflow prevention assembly are also disclosed.

In some implementations, an apparatus comprises a pipe, a stud that is forge-welded to the pipe, creating a forge-welded stud, a bracket that is operably coupled to the forge-welded stud, and a walkway operably coupled to the bracket.

In some implementations, an apparatus comprises a pipe, a stud that is forge-welded to the pipe, creating a forge-welded stud, a bracket that is operably coupled to the forge-welded stud, and a walkway operably coupled to the bracket.

A valve removal method of a fluid pipeline structure, which removes an unnecessary portion of a valve device from a connection port portion side of a pipe without flow disruption in the fluid pipeline structure that detachably includes the valve device including a valve body, which is openable and closeable from a direction intersecting a flow path axis of a connection port portion, on the connection port portion side of the pipe connected to a fluid piping system includes a valve body fixing step of fixing the valve body at a closed valve position to the connection port portion side in a sealed manner; and a valve component removing step of removing other unnecessary valve components of the valve device in a state where the valve body which is fixed in a sealed manner is left on the connection port portion side.

A temperature protection system includes a thermostatic mixing valve (TMV) and a stop valve assembly. The TMV is operably coupled to provide temperature controlled water to a faucet. The stop valve assembly is coupled between the TMV and a source of water. The stop valve assembly has a stop valve body, a stop valve element, and a ball valve. The stop valve body has a stop valve receiving tube, a water inlet tube and an outlet tube. The water inlet tube defines a water inlet to the stop valve body, and the outlet tube forms a water outlet to the stop valve body. The stop valve element is disposed within the stop valve receiving tube and interposed at least in part between the outlet tube and the water inlet. The ball valve disposed in the inlet tube between the stop valve element and the water inlet.

A system for retaining a valve assembly in a cavity formed in a cylinder body of a compressor includes a ring having a through-hole positioned adjacent to the cavity and a cover partially inserted inside a through-hole of the ring. The cover and the ring can slide relative to each other. The position of the cover relative to the cylinder body can be adjusted by tightening a cover retainer. The cover applies a downward force on the valve assembly via a cage. The downward force is used to compress a seal located between the valve assembly and the cylinder body. A seal is positioned between the ring and the cover. The seal remains squeezed when the cover and the ring slide relative to each other. The system can be used to convert a jackbolt cage-cover assembly and may not require significant machining of the cavity to provide a surface-finish with a suitable roughness for a sealing surface.

A system for retrieving a failed inner check valve that is part of an injection fitting includes a hollow isolation valve assembly that includes a first section and a second section that is detachable from the first section. The first section includes a first valve and the second section including a relief valve. The first valve moves between a closed position in which the first section is completely occluded and an open position and can be in the form of a ball valve. The system also includes an extraction tool that is configured to be coupled to and advanced along the isolation valve assembly. An elongated inner key is configured to be received into and pass through the hollow isolation valve assembly. A distal end of the inner key is configured to engage and unscrew the failed internal check valve for removal thereof.

An inventive lock open device for use with a poppet type check valve is disclosed. The device permits bidirectional flow of fluid or gas by defeating the check valve sealing device which permits hydrostatic testing without the need for check valve disassembly or the need for additional tooling.

A system and method for providing improved water line installation, and more specifically, to a system and method for providing a positive stop flow pipe isolation insert for use in installing water lines to an existing and active main water line is disclosed. The positive stop flow pipe isolation insert includes a water system pipe isolation insert segment connected to mechanical gate valve attached to a water system. The water system pipe isolation insert segment is coupled together with a solid inner core center on its opposite end. A water main pipe isolation insert segment is coupled to the solid inner core center and to the water main pipe on the other. Each of the pipe segments possess a 2″ c.c. threaded hole along a common center line of the pipe segments. A backflow preventer may be attached to the positive stop flow pipe isolation insert using the pair of 2″ c.c. threaded holes to use during pressure testing and chlorination.