Abstract: A male member to a hose adapter as for metal to metal, male to female, mating has a frustoconical sealing surface, for example, of 30, 37 or 45 degrees, for mating with a corresponding female member having a corresponding sealing surface. These surfaces are secured by a rotating female member, threads of which mate with the corresponding, threaded male member. The mating parts are drawn together as the threads are engaged and fully torqued. The male frustoconical surface is interrupted by a machined recess or undercut area, for example, of about 0.20 to 0.40 inches deep. This recess or undercut typically starts about one third of the way up the male frustoconical surface, and continues until the taper incline intersects with the threaded plane parallel to the bore of the adapter, and a recess or undercut extension can continue along the thread plane parallel or slightly tapered with respect to the bore until it reaches the base of the male thread, where it terminates.

Abstract: An improved relief valve is disclosed for use with a pressurized system. The improved relief valve includes an integral drain line coupling that prevents the outlet of the relief valve from being plugged or restricted in any manner such that discharge from the pressurized system flows uninhibited to an appropriate drainage point. The coupling includes a nipple which is rigidly secured to the outlet of the relief valve and which is coupled by a nut member to a drain line. In addition, the nipple is adapted for receiving a wrench for countervailing a torque transferred to the nut member.

Abstract: A water pipe connecting structure composed of a hexagonal locking nut, a coupling pipe, a connecting pipe, a metal fastening sleeve and a conic watertight washer. The locking nut has an inner flange at one end. The coupling pipe is divided by an expansion neck portion into an upper head portion and a lower binding portion formed with several slideproof check rings. The coupling pipe is fitted into the locking nut with the expansion neck abutting against the inner flange of the locking nut and with the binding portion extending through the inner flange to insert into the fastening sleeve fitted with one end of the connecting pipe. The fastening sleeve receiving the binding portion is rolled and pressed so as to bind therewith. An outer flange is formed at a top end of the head portion of the coupling pipe. The outer flange has an inclined outer periphery for engaging with the washer and preventing the same from dropping out.

Abstract: A pump system is described which is particularly suited for use as a left ventricular assist device for internal use in humans. The pump system generally includes a pump having a deformable sac formed in a seamless piece of flexible resilient material having (i) a pair of opposite substantially planar walls and of substantially circular shape joined by an annular wall of substantially semicircular cross-section and (ii) inlet and outlet means. The inlet means have an asymmetric tapered section positioned to direct the inlet flow toward the annular wall of the sac to produce a smooth circular flow within the sac and minimize thrombus formation. A pair of pusher plates are disposed on opposite sides of the sac. Each of the pusher plates are engageable with a respective one of the planar walls of the sac for displacing at least one of the planar walls toward the other to deform the sac. The pump system also includes removable inlet and outlet conduit means with valve means for controlling inlet and outlet flow.

Abstract: A cylinder valve outlet includes a bore with a large cylindrical entry leading to a tapered seat. A nipple with a cylindrical neck is fit into the large diameter entry of the bore of the valve outlet. The nipple further includes an arcuately convex mating end for seating in the conically tapered seat of the valve outlet. A seal enhancer is between the valve outlet and the nipple. The seal enhancer is generally tubular with opposed leading and trailing ends and a cylindrical section therebetween. The leading end is tapered for engagement between the tapered seat of the valve outlet and the mating end of the nipple. The trailing end of the seal enhancer is flared outwardly. The seal enhancer is shorter than the mating portions of the nipple so that the outwardly flared trailing end is visually readily apparent. The outwardly flared trailing end also facilitates separation of the seal enhancer from either the nipple or the valve outlet when the gas cylinder is being replaced.

Abstract: In a tube coupling a resilient sealing boot is disposed between facing frusto-conical sealing surfaces to prevent fluid flow therebetween. A first tube is provided an external frusto-conical sealing surface and an outer cylindrical surface adjoining the external sealing surface, and a second tube is provided an internal frusto-conical sealing surface within an end thereof. The sealing boot is preferably formed entirely of a flexible graphite material to include a cylindrical collar that fits over the outer cylindrical surface of the first tube, and a skirt having one or more integral O-rings which engage one or both of the facing frusto-conical sealing surfaces as the ends of the first and second tubes are drawn together.

Abstract: A fast tube connector structure including a tube connector, a rubber fastening washer, a guiding sleeve, a conic spring washer and a sleeve-like nut, wherein a tube is inserted through the nut into a space defined by the spring washer, guiding sleeve and fastening washer and located on a tube seat of the tube connector. The nut is then secured onto the tube connector, forcing the spring washer to move downward and causing a narrow end thereof to move downward along an inclined guiding flange. The claw portion is thus compresses by the guiding flange to tightly clamp and fasten the tube and firmly fictionally associate the tube with the tube connector.

Abstract: A reduced resistance bead seal is integrally formed on a mounting surface of one of two matingly engageable members to form a leak-free seal between the two members despite any eccentricity or angular variances between the two members. In one embodiment, the reduced resistance bead is formed on an inner conical flange of an inverted flared end of a hollow fluid conduit. The bead presents a deformable surface as a fitting urges the flared end of the conduit into engagement with a conical seat in a receiver where eccentricity or angular variances exist between the flared end of the conduit and the conical seat. A unique method and a unique forming tool are used to form the reduced resistance bead in the flared end of the conduit simultaneously with the flaring of the end of the conduit.

Abstract: Basic segment of a high-pressure pipeline has elements (1) and (2) connected to one another with an oblique rotary connection inclined at angle (alpha) to the pipeline axis (7), wherein the turning angle (8) of said oblique connection intersects in piping axis (7) the plane of revolution being perpendicular to the turning axis (8).

Abstract: A plastic coupling for plastic tubing having a groove annulus formed between a first circumferential groove on the outer periphery of the enlarged diameter portion of a connection tube and a second circumferential groove on the inner periphery of a cap nut 5 when the cap nut 5 is mounted on a joint body, and an enlargeable split ring having an internal diameter smaller than the external diameter of the enlarged diameter portion and loosely fitted into the second groove, the split ring being adapted to slide on the enlarged diameter portion to the first groove until the split ring falls within the first groove and is located within the groove annulus when the cap nut is mounted on the joint body.

Abstract: An inline valve includes a glass body having an upwardly open bore with a tapered seating surface, and colinear inlet and outlet ports having passages intersecting the seating surface. Fluid flow between the ports is regulated by a valve member whose stem has a tapered tip conforming substantially in shape to that of the seating surface. The tip has a relatively soft surface which can conform to irregularities in the seating surface when the valve is closed. An annular seal or an extensible boot prevents fluid leakage along the valve stem.

Abstract: A fluid coupling provides a cap nut having an internal screw formed inside, a pipe having a mirror-finished surface formed at an end face and a groove in an outer periphery, a device for preventing rotation of the pipe together with the cap nut, in contact with the inner end face of the cap nut, a ferrule fitted in the groove formed in the outer periphery of the pipe, in contact with the device for preventing the rotation of the pipe together with the cap nut, the ferrule which transmits to the pipe a thrust of the cap nut in the pipe's longitudinal direction, a gasket fitted on an end part of the pipe, with the end face of the pipe in contact with the gasket through the entire circumference, and a body mirror-finished at the end face and provided with an external screw formed on the outer periphery, wherein the end face of the body is in contact with one side of the gasket the other side of which is in contact with the pipe, and the external screw of the body and the internal screw of the cap nut is tightene

Abstract: A manifold for a front-discharge fluid end reciprocating pump. The manifold comprises tubular portions which are connected to ports on the pump by threaded engagement of a plurality of nuts. The manifold has a center portion and at least one branch portion which intersects the center portion. Another tubular portion having a ported end is in communication with the center and branch portions and provides an outlet for the manifold. At least one nut on the manifold is a standard nut having lugs extending therefrom adjacent to an outer surface of the nut. A special nut is used on at least one of the connections and has lugs extending adjacent to the inner surface thereof. The lugs on the special nut have a longitudinal thickness less than the nuts on the standard nut. In this way, the nuts may be engaged with closely adjacent ports on the pump without interference of the lugs on the nuts with one another.

Abstract: A fitting for engagement with the outer surface of a cable has a sleeve with an external thread adjacent one of its ends and a nut having a complementary internal thread at one of its ends. The one end of the sleeve is of one piece with or supports a tubular clamping device with an annulus of axially parallel flexible prongs alternating with elongated slots. The nut has a ring-shaped internal deforming surface which flexes the prongs radially inwardly toward the axis of the clamping device, and toward the outer surface of a cable extending through the sleeve and the nut, when the sleeve is threaded into the nut. The prongs have relatively thick portions which are remote from the sleeve and relatively thin, and hence more readily flexible, portions between the thick portions and the sleeve. The thick portions of the prongs can bear directly against the outer surface of a cable or against a deformable tubular seal which is placed between the prongs and the cable.

Abstract: A fitting or fitting assembly is provided that comprises a fitting body having an enlarged first end, a nut having a circumferential ridge that has a diameter less than the first end of the fitting body so that the first end prevents the nut from sliding further in one direction, and a ring that is adapted to be assembled onto the exterior surface of the fitting body to prevent the nut from sliding further in a second direction opposite to the first direction. The nut has interior threads that are adapted to receive the external threads of a mated fitting. A method for assembling the fitting comprises the steps of sliding a nut having an internally threaded portion onto a fitting body having an enlarged end that prevents axial movement of the nut in a first direction, and press-fitting a retention ring about the fitting body at a desired position in order to limit the axial movement of the nut in a second direction opposite to the first direction.

Abstract: A pipe joint comprises a pair of tubular joint members having a gasket holding annular projection on each of butting faces thereof, an annular gasket interposed between the butting end faces of the joint members, and a nut for connecting the joint members together. When the nut is tightened up, an indentation is formed in a surface of the gasket pressed by each of the gasket holding projections, and the gasket is pressed also by a portion of the end face of each joint member having no annular projection.

Abstract: An end fitting for flexible conduit or the like includes a generally cylindrical conduit insert which has a retainer rim, a journal barrel, and a base ring. The retainer rim and journal barrel are inserted into the conduit up to the base ring. A crimp ring dimensioned to engage the outer surface of the conduit, press fits the conduit to the journal barrel. The retainer rim being of a diameter larger then the diameter of the journal barrel prevents removal of the insert past the crimp ring. The base ring also being of a larger diameter than the journal barrel limits the depth of insertion of the insert into the conduit. The conduit insert further has a force flange and a tip which extend outward from the base ring. A cone washer is received by the tip and abuts a first surface of the force flange. A threaded cap has an end wall with a coaxial bore which is in rotatable engagement with the base ring with the end wall engaging a second surface of the force flange.

Abstract: An end fitting for flexible conduit or the like includes a generally cylindrical conduit insert which has a retainer rim, a journal barrel, and a base ring. The retainer rim and journal barrel are inserted into the conduit up to the base ring. A crimp ring dimensioned to engage the outer surface of the conduit, press fits the conduit to the journal barrel. The retainer rim being of a diameter larger then the diameter of the journal barrel prevents removal of the insert past the crimp ring. The base ring also being of a larger diameter than the journal barrel limits the depth of insertion of the insert into the conduit. The conduit insert further has a force flange and a tip which extend outward from the base ring. A cone washer is received by the tip and abuts a first surface of the force flange. A threaded cap has an end wall with a coaxial bore which is in rotatable engagement with the base ring with the end wall engaging a second surface of the force flange.

Abstract: A quick disconnect forming a coupler for high pressure fluid lines that has a first hollow member attached to a second hollow member in fluid-tight relationship with an attachment collar having relatively coarse threads thereon for quick attachment and detachment of the first and second members. A cylindrical stop ring is threadedly attached to one of the members to form a second shoulder in spaced opposition to a first shoulder on one of the members such that the attachment collar can move axially only between the two shoulders. A resilient O-ring is formed in a recess on the second member and engages an annular recess on the attachment collar to resist movement of the attachment collar by vibration.

Abstract: A high pressure fluid fitting is provided for repeated connection and disconnection. The fitting includes a threaded nipple and a flanged nipple configured for abutting end-to-end mating with one another. A thrust bearing formed from a metal harder than the flanged nipple is positioned adjacent the flange and on the side thereof opposite the mating face of the flanged nipple. A coupling nut with an inwardly extending annular flange is disposed over the flanged nipple and is threadedly engageable with the threaded nipple. The flange of the coupling nut moves against the thrust bearing and urges the nipples into tight sealing engagement. The smoothness and hardness and chemical dissimilarity of the thrust bearing avoid galling and other friction related damage to the fitting, and hence lead to an extended life for the fitting.

Abstract: A nut retention system for nut connected couplings including an end fitting having an outer end wherein interfering abutments are defined upon the end fitting and nut to limit retraction of the nut on the end fitting when the coupling is disconnected whereby the outer end of the nut will always axially extend beyond the outer end of the end fitting to protect the end fitting outer end and seal located thereon.

Abstract: A sealing connector for joining ends of two conduits is disclosed in which a collar is rotatably retained on an end of one of the conduits and is threaded onto the end of the other conduit to bring the sealing surfaces of the conduit ends into contact with each other. The collar has an end face and an internal shoulder facing in opposite directions such that the shoulder faces in the direction of movement as the collar is threaded onto the conduit end. A resilient ring member is located between the shoulder of the collar and the end of the conduit to which it is rotatably retained such that the resilient ring member is compressed during the connecting operation. Such compression causes deformation of the ring member which, in turn, causes a leg projecting from the ring member to come into contact with the collar and to extend beyond the end face of the collar.

Abstract: An anti-twist strain relief bushing for use with an exteriorly threaded tubular pipe for nondestructively restraining an electrical cord against axial or torsional displacements. The bushing comprises an interiorly threaded gland nut to be screwed onto the tubular pipe and an insert to be wedged into the pipe by the nut. The gland nut comprises a circular top defining a circular beveled opening, an integral flange spaced apart from the top parallel and concentric with the top, and an internally threaded, tubular body extending from the top to the flange defining a passageway concentric with the beveled opening and the flange. The body has a plurality of radially spaced apart raised ribs longitudinally disposed on its exterior. The underside of the top and the body define an integral, beveled shoulder disposed interiorly within the passageway. The insert comprises two separate, mirror image halves adapted to be folded together when the insert is forced into the pipe.

Abstract: A vented gravity dispenser for a liquid contained in a closed container. A clamp comprising a bevelled skirt, split compression ring and a nut are provided to sealingly attach said dispenser to said container. The present disclosure also details a dual acting valve, comprising a liquid discharge part and an air inlet part, which are co-operatively actuated.

Abstract: A coupling member of the type having a generally tubular body portion with a recessed annular element having a sealing surface portion, a swivel nut attached to the body portion and wherein the swivel nut has a concave frustoconical surface for engaging a second coupling member.

Abstract: A high pressure flex fitting comprises a tube assembly which engages within a fitting body. The tube assembly comprises a tube upon which a deformable flanged compression sleeve is disposed adjacent an elastomeric sealing ring which in turn is adjacent a retainer ring, the retainer ring being seated adjacent a flared end of the tube. A nut having an end flange engages over the sleeve and the flange on the nut bears against the radial flange on the sleeve, pushing the sleeve on the tube into the fitting body when the nut is threadedly engaged onto the fitting body. The fitting body includes a large cavity, within which the flared end of the tube is suspended, have a tapered inner entrance section from an entrance diameter larger than the sleeve to an inner diameter smaller than the sleeve to completely fill the area between the cavity wall and the tube adjacent the sealing ring which effects the seal between the cavity wall and the tube to prevent extrusion and fracturing thereof.

Abstract: A tube coupling is disclosed which electrically insulates the tube from the coupling. A metallic nut and body interact with a non-metallic coupling to constrict the non-metallic coupling about the tube end providing multiple seals and seats while avoiding metal-to-metal contact between the tube and either the nut or body. Multiple cooperating cam surfaces are provided on the body and non-metallic coupling to achieve a tube coupling stronger than, yet electrically insulated from, the tube.

Abstract: In a compression type union for compressing two tubing segments against an intervening washer, a male nut, a female nut, and a pair of caps, the caps having interengaging tongues and slots. The nuts bear against respective caps, and the caps bear against respective heads of the tubing segments. The caps being non-integral with either tubing segment or with either nut, and there is no interengagement of any kind between the nuts and the tubing segments. The union can be joined without concern for positioning either of the nuts.

Abstract: This invention relates to a pipe connector comprising: a main connecting pipe formed with an inverted conical surface at the upper edge, a threaded portion at the upper side, and a raised annular portion below the threaded portion; a leak-proof gasket mounted in the inner side of the raised annular portion of the main connecting pipe; a locking nut provided with internal threads and a stop edge having a conical surface opposite to the inverted conical surface of the main connecting pipe; a split ring disposed between the locking nut and the inverted conical surface of the main connecting pipe; and a connecting pipe inserted into the main connecting pipe through the locking nut; whereby two pipes can be easily connected together and no fluid can leak out thereof.

Abstract: A hydraulic coupling and method for producing such having a tubing with an end portion of a tubing wall outwardly bent and return bent upon itself to form a flattened double flanged end. The method of production using three separate press hits to secure a sleeve to the tubing, to form an annular V-shaped flange in the tubing wall and to compact the V-shaped flange into a flattened double flanged end.

Abstract: A water line adapter designed to convert a single water outlet line into a multiple outlet water line, with the adapter comprising a cubical body, a captive rotatable threaded nut attached to one face of the body, a first threaded member attached to the opposite face, and a second threaded member attached to another face. In one application, the adapter is attached to a shut-off valve by threading the captive rotatable nut over the threaded member of the shut-off valve. In this manner, a single outlet shut-off valve can be converted into a shut-off valve having two outlets. The adapter is particularly useful in providing a water supply to appliances such as ice makers, dishwashers and under-the-counter water filters.

Abstract: An elbow fitting of selected member configurations and comprised of two members separately machined utilizing bar stock exterior form and one of which is cross drilled for assembly with the other and preferably adapted to rotatably receive a swivel spout sealed and secured therein, using less material, requiring less machining, and cost effective.

Abstract: The present invention relates to face seal fittings for conduits or glands which employ metal gaskets. The fitting of the invention uses two annular end formations on each conduit endwall which sequentially engage the gasket to form two independent seals. The fitting is intended to be used in applications which have special cleanliness requirements.

Abstract: A threaded connection for tubing joints having a threaded part and a matching part fixedly connected with the tube, which embraces the tube externally and rests with an inner surface having grooves at the outer surface of the tube, wherein the fixed connection between the matching part and the tube is produced by rolling material of the tube into the grooves, the matching part 2 having at least one groove 7, 8 which is conducted in a threaded shape manner, so as to prevent failure of the tubing joint by crack formation.

Abstract: A pipe connector comprises mainly a main body, a threaded cap, and a rubber washer. It is further provided therein with a circular bowlike curved flange and means to prevent leak. In the process of joining the connector with a pipe, the connection head is made to engage securely with pipe by means of tightening the threaded cap to engage the main body so as to press the circular bowlike flange to engage securely the pipe in a leakproof manner and in such a way that it prevents the connection head from disengaging the pipe under high pressure.

Abstract: A coupling device for metal tubular members subjected to pressure where abutting coupling members define a V shaped groove. A metal annular V shaped sealing member constructed from resilient metal is disposed in the V shaped groove and arranged so that the sealing member has sealing edge portions which can expand longitudinally and radially to maintain a seal if the coupling members tend to separate or contract in response to pressure.

Abstract: A fluid conducting connector for use in water connections particularly water heater connectors. The connector assembly is designed for mating connection to a galvanized nipple for reduction of galvanic corrosion between dissimilar metal connections. An insulator sleeve is seated within the connector to maintain separation between the galvanized nipple and the copper tube of the assembly. The connector assembly includes an internally threaded female connector mounted to the copper tube for connection to the nipple. The insulator sleeve includes a tubular body and a radial flange. The body of the sleeve extends partially into the copper tube while the flange seats within the female connector acting as a washer for the assembly.

Abstract: A body is engaged with a sleeve by a direct sealing coupling. The sleeve has a flange at one end acting as a belleville spring. The flange has a sleeve sealing surface and a rear annular projection. The body has a body sealing surface at one end. The sleeve sealing surface has a conical angle and comes in contact with the body sealing surface by a female nut, a female thread of which is engaged with a male thread of the body, thereby applying fastening force onto the rear annular projection to form sealing between the body and the sleeve.

Abstract: A pipe connector comprising two members with respectively concave and convex mating co-operating ends and fitting together by an internally threaded sleeve retaining one of the members and tightened by being screwed onto the outer threading of the other member, this outer threading being extended by a threaded portion having a greater diameter than and the same pitch as those of the outer threading and being adapted to co-operate with a lock washer retained in a recessing formed in one of the ends of the sleeve.

Abstract: A reusable union coupling is provided, particularly for refrigeration service, comprising two fittings, a body and an adapter, which are attached to the two conduits or other components to be joined. A variable washer seal cavity is created when the body and adapter are mated, within which a teflon washer is disposed. Means are provided for moveably connecting the body to the adapter and selectively compressing the washer within the cavity, in particular a rotatable collar is provided which engages the adapter and threads onto the body. Means are also provided to prevent extrusions, displacement, and over-compression of the washer.

Abstract: A union joint capable of perfectly hermetically connecting pipes so that a gas passing the pipes never leaks from the junction of the pipes even if the pressure of the gas is as high as 150 kg/cm.sup.2. The union joint comprises a first sleeve hermetically joined to a pipe, a second sleeve hermetically joined to another pipe to be connected to the pipe joined to the first sleeve, one or a plurality of metallic gaskets placed between the respective sealing surfaces of the first and second sleeves so as to be compressed between the sealing surfaces of the first and second sleeves when the first and second sleeves are drawn axially toward each other, a coupling nut for drawing the first and second sleeves axially toward each other, and a thrust bearing interposed between the first sleeve and the coupling nut to allow the coupling nut to be rotated relative to the first sleeve.

Abstract: A releasable connector for interconnecting a first part and a second part, at least one of the parts being subjected to high stresses in particular of vibratory origin and of thermal origin, the connector comprising a sealing ring compressed between the two parts, a main lip formed on the first part to be interconnected, and at least one connection part for exerting a retaining action on the main lip relative to the second part to be interconnected and for compressing the sealing ring. The connector further includes an intermediate ring provided with a flange and constituted by at least two lengths, the intermediate ring being interposed between the main lip and the connection part and being made of a material of low thermal conductivity.

Abstract: A tube fitting for joining resinous plastic tubing comprises a fitting body having an opening with a conically shaped camming mouth. A tube extends into the opening. A first ferrule is slidably received on the tube and has an exterior surface which faces the camming mouth. A second ferrule is also slidably received on the tube at a location outwardly of the opening and the first ferrule. The second ferrule has a nose portion which engages the first ferrule adjacent the tube and is snap fitted within a recess formed circumferentially of the tube prior to association of the tube with the fitting. The nose portion of the second ferrule is engaged in the recess in axial driving engagement with the tube prior to make-up of said fitting. A nut member is threadedly engaged with the body for driving the first and second ferrules into the camming mouth during fitting make-up.

Abstract: A one-piece plastic body has a central cavity of hexagonal cross section for receiving the hexagonal rotatable end portion of a standard screw connector of a coaxial cable. When inserted into the central cavity, the connector is snugly retained between a bottom flange or stop and upper inward-projecting lips. The attachment includes wings projecting oppositely from the attachment body and extending rearward along the coaxial cable for convenient grasping by a user.

Abstract: A tube coupling comprises first and second coupling components having transversely extending sealing end faces in aligned face-to-face relationship. First and second nut members are arranged to drive the sealing end faces toward each other. An annular anti-twist member is located between the first nut and the first coupling member for conducting axial forces from the first nut member to the first coupling component. The annular anti-twist member and the second nut member include axially engaged portions for preventing relative rotation therebetween.

Abstract: A coupling is provided for interconnecting two tubular parts having opposed ends and shoulders spaced from the ends, and via which force is applicable to urge the opposed ends toward one another. The coupling includes two tubular members defining a longitudinal axis and adapted to coaxially receive the respective parts and to transmit axial force thereto, via the shoulders; a torque isolator assembly including an annulus received against one of the shoulders on one of the members, and generally longitudinal projection means positioned on the one member to block rotation of the annulus relative to the one member, and about the axis; cooperating screw threads on the members adapted to interfit when the members are relatively rotated to make up the coupling; and a pusher surface on the other of the members engagable with the annulus to transmit axial force via the annulus to the one shoulder, when the coupling is made up.

Abstract: The invention is an improved hydraulic coupling wherein the male and female fittings include complementary tapered surfaces and the male fitting is axially urged into engagement with the female fitting by means of a threaded nut. The male fitting is provided with a shoulder behind its tapered surface and abuts a surface on the female member to thereby limit the axial movement of the male member and prevent nose collapse.

Abstract: A screw-joint type pneumatic tool connector, which comprises an air inlet coupling having received therein a conical spring and a valve, a lock nut connected to the front end of said air inlet coupling by means of screw joint, a stepped control bush having a C-shaped retainer ring externally mounted thereon and being connected to the rear end of the air inlet coupling with a seal ring set therebetween, a socket sleeved on the control bush with an air outlet coupling secured thereto at its rear end by means of screw joint. By means of moving the air outlet coupling inward inside the socket, the valve is moved away from the seal ring to form an air passage for the passing therethrough of compressed air to drive a tool to operate.

Abstract: A fitting construction used for connection of pipes comprising a first pipe assembly having an inner pipe and an outer pipe separated by a wall flange, a corresponding second pipe having a threaded end, a slip-nut having internal threads on its wall part, and first and second gaskets. Either the inner pipe or the outer pipe of the first pipe assembly is provided threads thereon for threadedly engaging or connecting to the second pipe. The second gasket is shaped and sized to be placed on an end face of the second pipe and compressed between it and the wall flange. The outer pipe has an externally threaded end for threadedly engaging the slip-nut with the first gasket being compressed between a cap part of the slip-nut and an end face of the outer pipe.

Abstract: A water meter service coupling facilitates removal and/or replacement of a water meter by allowing for expansion of the water service line upon disconnection of the water meter. One embodiment of the water meter service coupling includes a housing having first and second ends, an expansion piston having one end thereof slidably inserted into the first end of said housing for being slidably moved into and out of said housing, a retaining insert disposed at the outer end of said expansion piston, and a nut disposed about said retaining insert for coupling said expansion piston to a water meter, wherein the second end of said housing is coupled to a water service line and the water meter service coupling is installed in an expanded state so that upon disconnection from the water meter, the water meter service coupling may be retracted so as to allow for easy removal of the water meter.