A double-pipe pipe coupling comprises a socket provided with a socket main cylinder having a front end portion on which taper holes are formed, locking balls housed in the taper holes and a sleeve on the outer periphery of the front end portion of the socket main cylinder. The plug is provided with a plug main cylinder on which an annular groove is formed. The socket has a cylindrical slide ring and a collar cylinder arranged coaxial to each other, and first and second passages and defined by the side ring and the collar cylinder. The slide ring includes a stopper for stopping the sliding of the slide ring in the axial direction of the socket main cylinder at a certain position and locking the movement of the sleeve when the slide ring advances and a valve member serving to seal the front end of the plug when the plug is connected into the socket. The plug includes a plug main cylinder, a partition wall formed integral with the plug main cylinder and located inside the plug main cylinder and at a position which corresponds to the collar cylinder of the socket, and first and second passages and which are partitioned by the partition wall. First and second slide valves are arranged in the first and the second passage.
An improved self-sealing-type double tube joint which has a pair of tubular outer shell 11, 21, each of which having a tubular inner barrier wall 12, 22 fixed therein so as to form a double flow passage. The tubular barrier wall 22 in a male outer shell 21 is closed at front end 23 therof, and a side passage 24 connecting to the flow passage 1 is formed in a side wall of the tubular barrier wall. A male-side ring-like movable valve element 41 is slidably mounted on the tubular inner barrier wall 22 so that the valve element 41 shuts the side passage and faces against an end surface of a tubular barrier wall 12 of the female outer shell 11. A female-side ring-like movable valve element 51 is mounted on the inner tubular barrier wall 12 in the female outer shell 11 so as to face against an end surface of the male tubular outer shell 21. A female-side center movable valve element 31 has a side wall through which a side passage 32 is opened to connect with the inner flow passage 1, and the center valve element 31 is inserted in a front area of the female-seide barrier wall 12.
A breakaway assembly for use in combination with a fuel dispenser apparatus is disposed between a segment of the hose attached to a fuel dispenser unit and a second segment of the hose terminating in a nozzle. The breakaway assembly has body portions with a first, assembled condition and a second condition in which the body portions are separated. A fuel valve located in each of the body portion permits flow of fuel when the body parts are assembled and prevents flow upon separation. An element securing the body portions together releases engagement upon application of tension force to the hose, across the breakaway assembly, above a maximum level. In a preferred embodiment, the hose is coaxial and a vapor valve is also disposed within the breakaway assembly.
An apparatus for connecting two double vacuum pipes for conducting cryogenic fluid consists of a tubular connecting mechanism connected to the outer tube of a double vacuum pipe by a tubular member, a one-touch locking mechanism connected to the outer tube of the other double vacuum pipe by another tubular member inserted in the first-mentioned tubular member, a warming chamber defined between both tubular members, valve mechanisms respectively provided between the tubular members and the inner tubes of the double vacuum pipes which valve mechanisms cooperate to close the inner tubes of the respective double vacuum pipes at the closed position so as to make the inner tube of one of the double vacuum pipes communicate with the warming chamber during the connection of both the double vacuum pipes and to cause the inner tubes of both double vacuum pipes to communicate with each other. During the connection of both double vacuum pipes, cryogenic liquid is introduced in the warming chamber to be evaporated and its temperature is raised to avoid generation of frost on the to-be-connected portions of the double vacuum pipes. A one-touch locking mechanism provides quick connection and disconnection of the double vacuum pipes.
A rapid-action coupling comprising a male part connected to a first and a third conduit and a female part connected to a second and a fourth conduit for releasable mutual connection of at least the first to the second conduit and also for releasable mutual connection of the third conduit to the fourth conduit. The male part and the female part of the rapid-action coupling each comprise a shell formed in one piece and a plurality of connecting channels. At least at the position of the separating surface between the male and the female parts, the connecting channels arranged in the parts are preferably concentric. According to another embodiment the first and the third conduit and the second and the fourth conduit are mutually concentric.
A break away hose coupling for use in conjunction with a vapor recovery nozzle and for application within a fuel line, that prevents untimely decoupling, that only decouples upon the exertion of a pre-determined amount of tension, while preventing unnecessary leakage of fuel and vapors, while being fully reconnectable. The coupling includes a pair of fittings, for connecting to the fuel line, a sleeve for housing the fittings, and each fitting incorporating a check valve to provide for closure of the fluid flow passage and closure of the vapor flow passage when decoupling occurs, a fluid chamber providing for flow of fluid and a vapor return passage, internal of the fluid flow passage, allowing vapor recovery in a concentric line. The device is pressure compensated to eliminate the effects of line shock.
