The present invention provides a socket and a pipe joint which facilitate coupling and uncoupling of the socket and a plug and which can prevent the plug from jumping out of the socket in the uncoupling. In a socket 10 of the present invention, fluid in a built-in plug part 22 is released to the outside via communication holes 40 of a second base portion 18 and a through hole 51 of a third base portion 19 in a semi-inserted state. Accordingly, the pressure in a hole portion 34 does not become excessively high and an engaged part 42 is not unexpectedly pushed upward. Thus, an engagement portion 38 and a second engaged portion 26 can surely engage with each other. Hence, the plug 12 can be prevented from jumping out toward the front end side in the semi-inserted state.

The present invention provides a socket and a pipe joint which facilitate coupling and uncoupling of the socket and a plug and which can prevent the plug from jumping out of the socket in the uncoupling. In a socket 10 of the present invention, fluid in a built-in plug part 22 is released to the outside via communication holes 40 of a second base portion 18 and a through hole 51 of a third base portion 19 in a semi-inserted state. Accordingly, the pressure in a hole portion 34 does not become excessively high and an engaged part 42 is not unexpectedly pushed upward. Thus, an engagement portion 38 and a second engaged portion 26 can surely engage with each other. Hence, the plug 12 can be prevented from jumping out toward the front end side in the semi-inserted state.

A joint includes a male module and a female module capable of docking with each other. The male module includes a core rod and a sliding cylinder that is slidably sleeved on an outer periphery of the core rod. A first valve port is disposed in the sliding cylinder, and the core rod is provided with a piston head that is in hermetic fit with the first valve port. The female module includes a valve body and a piston. A first channel is disposed in the valve body, the piston is slidably disposed in the first channel, and a second valve port that is in hermetic fit with the piston is disposed in the first channel.

A connector element comprising a body, a locking mechanism and a seal. The seal comprises a base arranged facing, backward to a proximal surface and facing, forward to a distal surface of the body, as well as a lip. The lip extends parallel to a longitudinal axis of the body and forward, protruding from the base and defining a free front edge. The seal presents a peripheral notch that is arranged, radially to the longitudinal axis, between the base and the lip, which opens to the front of the seal and a bottom of which is delimited on the rear by a joining portion of the seal connecting the base and the lip. The seal is configured to press backward against the proximal surface, in alignment with the free front edge of the lip, according to a direction parallel to the longitudinal axis.

A connector element comprising a body, a locking mechanism and a seal. The seal comprises a base arranged facing, backward to a proximal surface and facing, forward to a distal surface of the body, as well as a lip. The lip extends parallel to a longitudinal axis of the body and forward, protruding from the base and defining a free front edge. The seal presents a peripheral notch that is arranged, radially to the longitudinal axis, between the base and the lip, which opens to the front of the seal and a bottom of which is delimited on the rear by a joining portion of the seal connecting the base and the lip. The seal is configured to press backward against the proximal surface, in alignment with the free front edge of the lip, according to a direction parallel to the longitudinal axis.

The present invention provides a pneumatic valve system for easily attaching and sealing a valve coupler to a valve stem for filling an inflatable vessel such as a tire, tube, mattress, etc. The valve system may comprise the following major components: a valve stem, a valve cap with a pin passage and attachment structure for attaching to a valve coupler, a sealing member, a biasing member, the valve coupler comprising a coupler housing, a pin seat, an inflation pin, and a collar with ball bearings complementary to the attachment structure of the valve cap, and an elastic sleeve for providing inward force against the ball bearings. The valve system may allow for easy, secure, and sealed engagement between the valve coupler and valve stem by simply pushing down on the valve coupler, and disengagement by pulling up on the valve coupler with as little as two fingers.

A male element (10) for a fluid connection with a male body (12) including a tubular extension (20) and a crown (22) fixed around the tubular extension and having at least one radial recess opening onto an inner face (44) and onto an outer face of the crown (22). The male element comprises an integral ring (16) mounted around the crown, and for each radial recess, a locking element (14), movable between an inner position and an outer position, the outward movement of which is limited by the ring. Each radial recess is delimited by an inner wall (52) forming part of the crown and extending around a radial central axis of the radial recess. The ring has at least one longitudinal slot, which passes radially through the ring, and comprises a resiliently deformable end portion (112) with at least one inner tooth which is engaged in an outer groove, recessed in the crown.

A male element (10) for a fluid connection with a male body (12) including a tubular extension (20) and a crown (22) fixed around the tubular extension and having at least one radial recess opening onto an inner face (44) and onto an outer face of the crown (22). The male element comprises an integral ring (16) mounted around the crown, and for each radial recess, a locking element (14), movable between an inner position and an outer position, the outward movement of which is limited by the ring. Each radial recess is delimited by an inner wall (52) forming part of the crown and extending around a radial central axis of the radial recess. The ring has at least one longitudinal slot, which passes radially through the ring, and comprises a resiliently deformable end portion (112) with at least one inner tooth which is engaged in an outer groove, recessed in the crown.

One or more techniques and/or systems are disclosed provide for a user device merely fluidly coupling with an appropriately matched, target fuel source. The user device can use complementary-keyed connectors to provide for desired user devices coupling merely with desired, target fuel sources. To accomplish this, a male connector may be configured with a keyed feature, and a female connector may be configured with a keyed location complementary to the keyed feature of the male connector.

A coil spring is disposed in a fluid passage between a cylindrical body and a valve element to urge the valve element toward a closed position. The coil spring comprises a valve support portion supporting the valve element, a secured portion secured to an inner peripheral surface of the fluid passage, an expanding-contracting portion extending from the secured portion, and a connecting portion between the expanding-contracting portion and the valve support portion. The connecting portion comprises a first portion curved so as to pass radially outward of an end winding portion of the expanding-contracting portion, a second portion passing through the center of the valve support portion, a third portion extending curvedly so as to overlap the first portion, and a fourth portion extending to the valve support portion. When the coil spring is compressed, the valve support portion is supported to the expanding-contracting portion 54 through the connecting portion.