A valve interconnector, suitable for use in combination with a receiver interconnector to couple a first hollow body to a second hollow body, is disclosed. The valve interconnector comprises a neck (7) to be secured to the first hollow body and further comprises a base cap (8) comprising an exterior tube portion (85) covering at least a portion of the external surface (7s) of the neck (7). The exterior tube portion and the neck are secured to each other with ability of relative rotation about a central axis. The valve interconnector is provided with a selector (44, 48) operative between the neck (7) and the exterior tube portion of the base cap (8) and configured for assuming at least a first position and a second position, in the first position the base cap being prevented from being axially released from the neck, in the second position the base cap being enabled to be axially released from the neck.

Method and system are provided for a quick connector for coupling conduits. The quick connector comprises a first piece including a first slot group, a second piece including a second slot group and a first protrusion group counterpart to the first slot group, and a third piece including a second protrusion group counterpart to the second slot group, where each slot of the first slot group angles in a first direction, and each slot of the second slot group angles in an opposing, second direction. In one example, the quick connector may include a locking mechanism and a feedback system.

Method and system are provided for a quick connector for coupling conduits. The quick connector comprises a first piece including a first slot group, a second piece including a second slot group and a first protrusion group counterpart to the first slot group, and a third piece including a second protrusion group counterpart to the second slot group, where each slot of the first slot group angles in a first direction, and each slot of the second slot group angles in an opposing, second direction. In one example, the quick connector may include a locking mechanism and a feedback system.

A grouting device for high-coagulability grouting materialsincludes a grouting pipe, a connector and a self-sealing pipe head, wherein one end of the connector is connected with a grouting pump through the grouting pipe, the other end of the connector is connected with the self-sealing pipe head through the grouting pipe, and the grouting pipe is connected with the connector and the self-sealing pipe head in a fixed and sealed mode. The grouting device is easy to install, features reliable connection between the grouting pipe and the connector and the self-sealing pipe head, and can be reused. Because the inner diameter of the connector is consistent with the inner diameter of the grouting pipe, and a slurry outlet on an end cap of the self-sealing pipe head is a circular slurry outlet, pressure loss in the grouting process is effectively reduced, and the grouting effect is good.

Example aspects of a nozzle cap adapter, a nozzle cap assembly, and a method for method for mounting a nozzle cap to a fire hydrant nozzle are disclosed. The nozzle cap adapter can comprise an adapter ring defining a first adapter ring end, a second adapter ring end opposite the first adapter ring end, and an interior void extending from the first adapter ring end to the second adapter ring end; a nozzle connector extending from the second end of the adapter ring, the nozzle connector configured to rotatably engage a fire hydrant nozzle; and a latch coupled to the adapter ring and configured to removably lock the nozzle cap adapter onto the fire hydrant nozzle.

Example aspects of a nozzle cap adapter, a nozzle cap assembly, and a method for method for mounting a nozzle cap to a fire hydrant nozzle are disclosed. The nozzle cap adapter can comprise an adapter ring defining a first adapter ring end, a second adapter ring end opposite the first adapter ring end, and an interior void extending from the first adapter ring end to the second adapter ring end; a nozzle connector extending from the second end of the adapter ring, the nozzle connector configured to rotatably engage a fire hydrant nozzle; and a latch coupled to the adapter ring and configured to removably lock the nozzle cap adapter onto the fire hydrant nozzle.

A fluid coupling has engagement unit retained by a retention unit. The engagement unit has an outer surface having ears, and the retention unit has an interior surface for surrounding a portion of the engagement unit. The interior surface has pockets corresponding to the ears, and each pocket retains a corresponding ear. When the engagement unit is moved in an engagement direction, each ear passes a sidewall of a corresponding pocket and can be rotated and released to rest in the corresponding pocket. The ears may comprise sloped surfaces angled relative to a horizontal plane perpendicular to a length of the engagement unit. The fluid coupling may further comprise a gasket having a bearing surface for bearing against an end of the engagement unit, a base element for fixing the sealing gasket relative to the retention unit, and a flexible membrane extending from the base element to the bearing surface.

A fluid coupling has engagement unit retained by a retention unit. The engagement unit has an outer surface having ears, and the retention unit has an interior surface for surrounding a portion of the engagement unit. The interior surface has pockets corresponding to the ears, and each pocket retains a corresponding ear. When the engagement unit is moved in an engagement direction, each ear passes a sidewall of a corresponding pocket and can be rotated and released to rest in the corresponding pocket. The ears may comprise sloped surfaces angled relative to a horizontal plane perpendicular to a length of the engagement unit. The fluid coupling may further comprise a gasket having a bearing surface for bearing against an end of the engagement unit, a base element for fixing the sealing gasket relative to the retention unit, and a flexible membrane extending from the base element to the bearing surface.

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.

There is proposed an annular seal for a pipe coupling, comprising, a lower portion beatable within an upwardly open annular groove in the pipe coupling, an upper portion having an upwardly facing abutment surface, a depending skirt and a stiffening ring. The depending skirt is configured for engagement over a circular upstand of the pipe coupling, which is located inwardly of the annular groove. The stiffening ring is located within the upper portion of the annular seal, and includes an annular portion that is generally parallel with and spaced apart from the abutment surface and at least one circumferential leg depending from the annular portion that provides reinforcement for the depending leg.