An embodiment of a fire-suppression water-intake valve includes a receptacle and a valve assembly. The receptacle is configured to receive a sprinkler head. And the valve assembly is configured to close in response to removing a sprinkler head from the receptacle, and is configured to open in response to installing a sprinkler head in the receptacle. Such a fire-suppression water-intake valve can allow quick and easy removal and installation of a fire-suppression sprinkler head without shutting a water supply to the valve.

Methods and apparatus are disclosed for a low-emission nozzle and receptacle coupling for cryogenic fluid. An example nozzle includes a body defining a chamber through which cryogenic fluid is to flow. The body includes an outer shell that includes an outer shell surface. The nozzle includes a locking assembly configured to securely couple the nozzle to a receptacle. The locking assembly includes an inner sleeve fixedly coupled to the outer shell surface and an outer sleeve extending over and rotatably coupled to the inner sleeve. One or more locking teeth are fixedly coupled to the outer sleeve and configured to be slidably received by respective one or more coupling slots of the receptacle. The one or more locking teeth are configured to rotatably slide within the respective one or more coupling slots to couple the nozzle to the receptacle as the outer sleeve rotates relative to the inner sleeve.

Methods and apparatus are disclosed for a low-emission nozzle and receptacle coupling for cryogenic fluid. An example nozzle includes a body defining a chamber through which cryogenic fluid is to flow. The body includes an outer shell that includes an outer shell surface. The nozzle includes a locking assembly configured to securely couple the nozzle to a receptacle. The locking assembly includes an inner sleeve fixedly coupled to the outer shell surface and an outer sleeve extending over and rotatably coupled to the inner sleeve. One or more locking teeth are fixedly coupled to the outer sleeve and configured to be slidably received by respective one or more coupling slots of the receptacle. The one or more locking teeth are configured to rotatably slide within the respective one or more coupling slots to couple the nozzle to the receptacle as the outer sleeve rotates relative to the inner sleeve.

The filter element includes a filter medium having an axis and forming a channel extending substantially axially, a first and a second end plate, each end plate covering one axial end of the filter medium and being sealingly mounted on the axial end whereby a liquid to be filtered can flow through the filter medium towards the channel and out of the filter element through an opening in fluid communication with the channel, or reversely. The filter element includes a protrusion fixedly secured to the first end plate and extending outwardly from the first end plate, the protrusion being substantially tubular and having a through hole in fluid communication with the first end plate opening, the protrusion forming a female coupling piece of a male-female connector, and a locking member capable of releasably locking a male coupling piece of the male-female connector in the female coupling piece.

A connector convenient for disassembling a water pipe includes a connecting joint and a connecting water pipe. The top end of the connecting joint is communicated with a first threaded cylinder, and the bottom of the connecting joint is fixedly connected to an annular fixing plate. The bottom of the annular fixing plate is fixedly connected to a fixing cylinder, and the surface of the fixing cylinder is fixedly connected to a fixing block. The inner wall of the connecting water pipe is provided with an L-shaped groove. In the installation of the connecting water pipe by setting the L-shaped groove, the annular clamping plate, the internal thread, the external thread and the movable cylinder, the fixing block is movably connected to the interior of the L-shaped groove, and then the fixing block is clamped inside the groove by rotating the connecting joint.

A connector convenient for disassembling a water pipe includes a connecting joint and a connecting water pipe. The top end of the connecting joint is communicated with a first threaded cylinder, and the bottom of the connecting joint is fixedly connected to an annular fixing plate. The bottom of the annular fixing plate is fixedly connected to a fixing cylinder, and the surface of the fixing cylinder is fixedly connected to a fixing block. The inner wall of the connecting water pipe is provided with an L-shaped groove. In the installation of the connecting water pipe by setting the L-shaped groove, the annular clamping plate, the internal thread, the external thread and the movable cylinder, the fixing block is movably connected to the interior of the L-shaped groove, and then the fixing block is clamped inside the groove by rotating the connecting joint.

A line coupling assembly for a motor vehicle includes a line coupling, a first line, and a second line which can be coupled to the first line via the line coupling, wherein at their coupling-side ends, which are supposed to be connected, the lines each have a coupling component which, when the lines are completely coupled, interact such that the lines are tightly coupled together. When the lines are not completely coupled, the coupling components interact such that there is a defined inspection gap near the line coupling.

A line coupling assembly for a motor vehicle includes a line coupling, a first line, and a second line which can be coupled to the first line via the line coupling, wherein at their coupling-side ends, which are supposed to be connected, the lines each have a coupling component which, when the lines are completely coupled, interact such that the lines are tightly coupled together. When the lines are not completely coupled, the coupling components interact such that there is a defined inspection gap near the line coupling.

Improved couplings for conduit systems include a male coupling and a female coupling. The male coupling and female coupling may be mechanically engaged by inserting the male coupling into a receiver in the female coupling until fastening structures are aligned, and then rotating one or both of the male and female couplings until the fastening structures are overlapping and in interfacial engagement. The male and female couplings provide an efficient coupling solution for end-to-end conduit connection and also addresses a leakage problem in conventional irrigation pipe couplers.

Improved couplings for conduit systems include a male coupling and a female coupling. The male coupling and female coupling may be mechanically engaged by inserting the male coupling into a receiver in the female coupling until fastening structures are aligned, and then rotating one or both of the male and female couplings until the fastening structures are overlapping and in interfacial engagement. The male and female couplings provide an efficient coupling solution for end-to-end conduit connection and also addresses a leakage problem in conventional irrigation pipe couplers.