Abstract: An insulative cover assembly for insulating a P-trap drain piping assembly comprises a unitary body including a first section and a second section joined together at a third section, the first section having an body configured to cover a pipe and having a first end, and the second section having a body configured to cover a pipe and having a first end. The third section couples second ends of each of the first and second sections together and comprises a structurally weakened area therein which is manually separateable for forming first and second cover pieces from said unitary body. The ends of the separated first and second sections further include structurally weakened areas for trimming the lengths of the sections during installation whereby the piping assembly is quickly and efficiently covered and insulated generally without the need for special installation tools.

Abstract: The preferred embodiment of the invention is a fluid pressure alleviating pneumatic or hydraulic system component. The invention is comprised of a diaphragm, carrier and a release mechanism. The diaphragm is attached to the carrier. The release mechanism bears against the diaphragm and positions it such that fluid pressure on the surface of the diaphragm produces only or primarily shear force at the connection between the carrier and the diaphragm. The connection and parts have sufficient strength so that the fluid pressure can not shear the diaphragm from the carrier. When the fluid pressure becomes excessive the release mechanism, under force, retreats and allows the pressure of the fluid medium to translate the diaphragm into a position relative to the carrier that will invoke peel force between the carrier and the diaphragm.

Abstract: A valve assembly for a tank having an opening. The valve assembly includes a body assembly mounted to the tank opening. The body assembly has a valve seat and a valve throughbore. A valve disk coacts with the valve seat for opening and closing the valve throughbore. A locking lug is attached to the valve disk. The locking lug has a locking portion for receiving a safety lock pin mounted in the body assembly. The safety lock pin has a locked position and an unlocked position. The safety lock pin is received in the locking portion of the locking lug to lock the valve disk in the locked position, and the safety lock pin is withdrawn from the locking portion in the unlocked position. A valve operator is in releasable contact with the valve disk. The valve operator forces the valve disk away from the valve seat to open the valve throughbore. The body assembly includes a first member and a second member and the lock pin is mounted in the first member.

Abstract: An improved fire hydrant having a lower portion and an upper portion. Under normal circumstances the upper portion is simulated fire hydrant made of resilient plastic and connected to the lower hydrant by a special fitting attached to the rim of the hydrant and opened or closed by a key. The special fitting is fastened to a plate projecting upwardly from the lower hydrant. The plate is connected to the lower hydrant through a segmented collar that is secured around a flange of a basket housing. In case of a fire the simulated fire hydrant is replaced by a light weight metal portable hydrant on which the key is suspended, and transported on a fire truck. The portable hydrant has a plurality of dowels that fit into grooves located on an upper extension of the lower fire hydrant.

Abstract: An automatic sewer line trap priming assembly including a gap type, anti-siphoning conduit component. A shielded and directed jet at timed intervals directs priming water increments into a receiving funnel which communicates with the trap.

Abstract: An automatically operating shut-off valve has a valve body (12) with a weakened zone (15) about which the body will break, in the event the valve is subjected to a shock load. A valve seat (25) is formed within the body (12) and a valve member (29) is pivoted to move between an open position and a closed position, against the valve seat. The valve member is spring-urged to its closed position but is held in its open position by a crank (34) having a pin (35) bearing on a brittle glass rod (33). The valve will close whenever the rod (33) breaks, even if the shock load is only sufficient to crack the valve body, about the weakened zone.

Abstract: An insulative cover assembly for insulating a P-trap drain piping assembly comprises a unitary body including a first section and a second section joined together at a third section, the first section having an body configured to cover a pipe and having a first end, and the second section having a body configured to cover a pipe and having a first end. The third section couples second ends of each of the first and second sections together and comprises a structurally weakened area therein which is manually separateable for forming first and second cover pieces from said unitary body. The ends of the separated first and second sections further include structurally weakened areas for trimming the lengths of the sections during installation whereby the piping assembly is quickly and efficiently covered and insulated generally without the need for special installation tools.

Abstract: A cover assembly and methods for covering undersink piping includes insulative cover pieces placed over respective pipe sections such that their ends are adjacent at pipe junctures. Collars are slidable over or inside the cover pieces to be moved to cover the junctures. An alternative cover structure may be wrapped around the pipe juncture to form a generally continuous insulative cover, or alternatively, the fastening structures are insulated such that when the pipe sections are assembled together, the cover pieces and insulating fastening structures form a continuous insulative cover. In an alternative embodiment, one of the cover pieces is dimensioned to slide upwardly and downwardly on a pipe section and a collar structure is placed over the exposed pipe section to provide a continuous cover piece.

Abstract: A hydrant protector for preventing unauthorized use of the hydrant includes an internally threaded tubular shleld around the valve stem. To prevent a collection of trash in the shield and to provide more security for the hydrant a threaded plug fits completely into the shield and against the end of the valve stem and has, in the flat exterior end, a pentagonal keyway of deep grooves. A wrench having a pentagonal tubular socket to fit the keyway will also fit the valve stem.

Abstract: A torque limiting valve handle for rotating a shaft of a valve is provided. The valve handle includes an elongated arm having a first opening therein adjacent to one end thereof forming an inner surface and a first channel formed in the inner surface. The handle also includes a hub disposed in the first opening and engagable with the shaft. The hub has an exterior surface and a second channel formed in the exterior surface and a drive position relative to the arm wherein the first and second channels cooperate to define a pocket. The handle further includes a shear pin disposed in the pocket for preventing rotation of the hub relative to the arm so that the hub rotates in response to rotation of the arm to apply torque to the shaft to rotate the shaft. The pin is frangible in response to application thereto of a force in excess of a predetermined force to allow relative rotation of the hub and the arm and prevent application to the shaft of a torque greater than a predetermined torque.

Abstract: A pressure vessel safety relief includes one or more recesses on a bottom wall section of the vessel. The thickness of the bottom wall section in areas directly over each recess is less than the thickness of remaining areas of the bottom wall section. Once the bottom wall section has corroded to a significant degree, the wall section ruptures in areas over the recesses to safely relieve pressure within the vessel. Preferably, the recess decreases in cross-sectional area as the top of the recess is approached, such that the escaping air emits a high-pitched whistling noise that functions as an alarm to notify the user that the vessel is corroded and should be replaced.

Abstract: A tamper-resistant independent brake valve device for use in a brake equipment on railway locomotives including a main body casing carrying a movable handle, a rotatable cam, a pivotal cam dog and an exhaust and supply valve assembly, a spring housing attached to the main body casing by a plurality of one-way screws, a break-away adjusting screw for setting the maximum brake cylinder pressure on the railway locomotive, the pivotal cam dog including an enlarged head portion to preclude the insertion of a prying tool, and the pivotal cam dog having cam engaging roller which is rotated on a round head roller pin.

Abstract: A coupling device 10 includes a nozzle 11 and a receptacle 12. The receptacle 12 includes a poppet assembly 35 that is biased by a spring 41 to a closed position. The receptacle 12 also includes an interface sealing surface 31. The nozzle 11 includes a nozzle valve 75 having a poppet 76 and a valve seat 79. The nozzle 11 also includes an interface seal assembly 85 movable between opened and closed positions relative to the receptacle interface sealing surface 31. The valve seat 79 and the interface seal assembly 85 are both carried on a movable carrier 88, and an actuator assembly 95 is operably connected to effect movement of the poppet 76, the valve seat 79 and the interface seal assembly 85. The actuator assembly 95 holds the interface seal assembly 85 opened during coupling and uncoupling of the nozzle 11 and receptacle 12 and closed during opening and closing of the nozzle valve 75 and receptacle poppet assembly 35. A collar 48 locks the receptacle 12 to the nozzle 11.

Abstract: A watertight waste water access fitting that is placed below ground level to mate with a pipe from a waste water source and a pipe from a sewer system and with access to its inside from ground level. The fitting is a preformed, polyethylene, one piece hollow body with three formed extensions from the body. Two of the extensions are formed at the bottom sides of the fitting, and one is formed at the top. The bottom side extensions mate with water pipes, and the top extension can be opened to expose the inside of the fitting for maintenance. The bottom extensions are formed of connected segments of decreasing outer diameter with a cutting guide on each segment. The segments can be cut to mate with various diameters of pipe. The top segment has a cap and cutting guide where the cap can be removed by cutting the segment at the cutting guide.

Abstract: A cover assembly for undersink piping is presented having cover pieces for the various piping sections of an undersink P-trap drain assembly. The pieces are configured to cover the various pipe sections of the P-trap and have integral, flexible collars at the ends thereof which overlap the junctures and fastening mechanisms between the different pipe sections. The invention further includes a cover piece for an offset grid drain which is used with a P-trap having a longitudinal slit, a flexible collar on one end, and a band which is placed over the slit cover piece and moved up along the cover piece to hold the slit piece together while the flexible collar is folded downwardly to cover the pipe juncture between the offset grid drain and a P-trap. In one embodiment, the band is removably attached to the integral cover.

Abstract: Setting device for a valve for the manual control of the position of a valve body. The handle portion of the setting device is provided with two wing portions extending in opposite circumferential directions outside a central portion of the handle portion. The handle portion can be manuvered by means of the screwdriver or the like, even in narrow spaces.

Abstract: Slit pieces of thermal insulating molded rubber are configured to conform to under-sink piping, so as to provide protection against burn injury from contact with hot surfaces. Three or four pieces are telescopically and rotatably interengaged with one another to cooperatively enclose an installed P-trap assembly, and the piece covering the J-bend is formed with a protrusion to accommodate clean-out structure provided thereon.

Abstract: A high flow emergency valve contained within an interior of a storage tank having an opening and a valve seat about the opening including a housing member for sealing and unsealing the valve seat, a push rod member for engagement with and activation of the housing to seal and unseal the valve seat, the push rod including a first portion positioned within the housing and a second portion extending out of a housing aperture to the tank exterior for manipulation from the exterior of the tank to open and close the valve seat, a sleeve member for substantially enclosing the first portion of the push rod within the housing and providing sealed sliding engagement between the push rod and the sleeve, a connecting member for attaching a portion of the sleeve against movement with respect to the valve seat, an engagement member between the housing and the sleeve for sealed sliding movement of the housing with respect to the sleeve, and a biasing member for maintaining the housing in a normally closed position with resp

Abstract: A shear fitting for coupling a downstream vertical conduit to an upstream vertical conduit in, for example, an underground suction-type fuel delivery system, includes a hollow body defining a fluid flow passage between an inlet in an upstream body portion and an outlet in a downstream body portion. The upstream body portion is configured to be removably coupled to the upstream conduit, and the downstream body portion is configured to be removably coupled to the downstream conduit. The body has a peripheral shear groove defining a frangible annular wall portion that fractures in response to a shear force of more than a predetermined magnitude. A test port extends from the flow passage to the exterior of the body, the port being sealed by a removable closure. Removal of the closure results in a loss of prime in a suction-type fuel delivery system only if there is no check valve in the conduit upstream from the shear fitting, thereby allowing verification of the absence of such a check valve.

Abstract: An improved procedure and apparatus for mounting and replacing fire hydrants including a hollow, box-like structure comprising a plastic cylinder which can enclose the hydrant-mounting flange to protect the flange, yet which can quickly and easily be removed and replaced, even by unskilled workmen, to provide access to the hydrant-mounting flange and the break-away bolts without requiring expensive and time-consuming cement work.

Abstract: A unitary article is cut into sections to provide pieces that are configured for emplacement upon under-sink piping, as insulation against burn injury from contact with hot surfaces. Three pieces cooperate with one another to provide a system for enclosing an installed P-trap assembly.

Abstract: An internal valve for a mobile tank car having an opening with a valve seat positioned in the opening. A sealing valve element is positioned in the tank for coacting with the valve seat for opening and closing the valve. A disc valve is releasably connected about the passageway below the valve element. A stem sealingly extends through the cap and is engagable with the valve element when the valve element is in the closed position. An actuator is connected to the stem outside of the cap for actuating the stem and locking the valve element in the closed position. A secondary seal may be actuated by the stem.

Abstract: Slit pieces of thermal insulating molded rubber are configured to conform to under-sink piping so as to provide protection against burn injury from contact with hot surfaces. Three pieces cooperate with one another to enclose the installed P-trap assembly, and a fourth piece is severable into two parts which serve to enclose the hot water valve and its supply pipe and tube.

Abstract: A pressure vessel has an excess pressure release device comprising a passage between the interior and the exterior of the pressure vessel, a bursting disc seated in the passage, and a flexible membrane mounted adjacent to the disc between the interior of the vessel and the disc so as to seal the passage and hold the disc captive without the disc being clamped. The excess pressure release device may be used in connection with any pressure vessel requiring an excess pressure release device of the bursting-disc type. The device is particularly suitable for use in the dispensing valve of a home carbonation apparatus.

Abstract: An underground access box and valve operating and protecting means are disclosed. The access box comprises a pair of valve enclosing members adapted to be fitted together to enclose a valve and present an upward extension through which the valve can be reached. The valve enclosing members have a generally planar bottom, an open side, and an upwardly extending side portion. The bottom projects beyond a side portion and a flange extends upwardly from the bottom portion along a side portion. The valve operating means comprises a high-head comprising an elongated central portion, an upper operating nut portion, and a lower valve nut socket portion, at least one of which is melt fused to the central portion so as to be severed from the central portion if the high-head is exposed to torque which would damage the valve or the line to which the valve is connected. Further, an adapter is provided which enables one to use a square head valve operating socket on a flat head valve nut.

Abstract: A hydraulic power drive unit for connection to the hydraulic system of an agricultural tractor is provided with a pressure release valve to protect the unit seal from damage if connected the wrong way round, and a bleed pipe which bursts to relieve pressure if the pressure release valve fails to operate.

Abstract: The combination of a fluid conductive pipe line and an in-line valve adapted to open and close the fluid passage in said line, said valve having an external handle operatively connected to open and close the valve, said handle having an enlarged free end forming a foot pedal and being positioned such that the handle can be pivotally rotated to close said valve by foot or other pressure on said foot pedal.

Abstract: A service valve includes a valve body (12) having an upper chamber (18), a lower chamber (20), an open top end (22) and an open bottom end (24). The lower chamber (20) includes an inlet opening (26) and an outlet opening (28). A valve member (14) is disposed in the valve body (12) and is molded of plastic material to form a unitary body including a plug portion (36) having a flow passage (38) therethrough and an actuator portion (34). The plug portion (36) is rotatable in the valve body (12) between an open position where the flow passage (38) is aligned with the inlet (26) and outlet (28) openings and a closed position where the flow passage (38) is out of alignment with the inlet (26) and outlet (28) openings. The actuator portion (34) extends outwardly from the plug portion (36) through one of the chambers (18, 20). First ( 50) and second (51) seals act between the plug portion (36) and the valve body (12) for sealing against leakage from the inlet opening (26) and outlet opening (28).

Abstract: A fire hydrant comprising an upper portion and a lower portion. The lower portion contains a water inlet valve and an operating rod for selectively opening and closing the valve. The upper portion of the fire hydrant includes a bonnet and collar with apertures in them respectively. The valve is opened and closed by a removable tool which is threaded through an opening in the upper portion of the fire hydrant and engages the operating rod to move it and thereby open the valve.

Abstract: A gate valve is provided having a valve body with a fluid passage therethrough and a riser passage at right angles to the fluid passage. A valve gate is included for opening and closing the fluid passage. A valve stem is operatively connected with the valve gate for transmitting movement force to the valve gate. The valve stem includes a first wrench for receiving a drive member and an identically shaped second wrench head. The wrench heads are separated by a first zone of weakness formed to fail completely when a first predetermined torque is applied to the stem. Upon complete failure of the first zone of weakness the second wrench head would be exposed for engagement by a drive member to turn the valve stem. A second zone of weakness is formed on the valve stem below the first zone of weakness and is formed to fail when a second predetermined torque greater than the first predetermined torque is applied to the stem.

Abstract: A plastic service valve includes a valve body of molded plastic having upper and lower chambers. The valve body is open at the top and bottom ends. The lower chamber includes inlet and outlet openings. A thrust seat is formed within the upper chamber between the open top end and the inlet and outlet openings in the lower chamber. A valve member is disposed in the valve body and positioned against the thrust seat. Structure is provided in the valve member and adjacent to the thrust seat for locking the valve member to the valve body. The valve member is molded of plastic material to form a unitary body including a plug portion and an actuator portion. The plug portion is rotatable in the valve body between an open position which is aligned with the inlet and outlet openings of the lower chamber of the valve body and a closed position. The actuator portion extends upwardly through the upper chamber portion and receives an operating nut.

Abstract: A chemical reactor vessel is provided with a plurality of tubes filled with a heat exchange fluid. The tubes are disposed in a heat exchange relationship with the reactor contents and are coupled via pressure sensitive rupture discs and a header to a reservoir. Upon overheating of the reactor contents, excess heat is absorbed by the heat exchange fluid which boils off at a predetermined vaporization temperature and vapor pressure to rupture the discs and thereby establish fluid communication between the tubes and a heat exchange fluid contained in the reservoir, and thereby maintaining the reactor contents at a preselected safe temperature.

Abstract: An improved post assembly for operating an inaccessible valve having upper and lower connecting shaft portions within respective upper and lower column sections wherein each of the shaft portions and column sections are connected by breakaway means enabling the parts to be separated by impact, and replaceable, at a level above grade, and also having an attachment between the lower connecting shaft and a valve shaft.

Abstract: A post assembly for a remotely placed valve and valve actuator includes a post with a hinged cover cap and multiple windows evenly spaced below the cap and a target axially movable past said windows on an operating stem fully contained within the post and with the operating nut on said stem below the cover cap and substantially within the target.

Abstract: A trap device for placement on the overflow standpipe provided in the sump of an evaporative cooler for blocking the high velocity inflow of sewer gasses or other contaminants through the standpipe into the cooler during operation thereof without interfering with the water draining functions of the standpipe. The trap device is in the form of an inverted cupshaped body which is mountable in substantially concentric relationship with the standpipe and has a closed top which is spaced above the top of the standpipe and an open bottom end which is submerged in the operational water supply contained in the sump of the evaporative cooler. The closed top of the trap device is provided with a knock-out plug so that the drain hose of a bleed-off system may be sealingly inserted therein when the cooler is so equipped.

Abstract: A pressure release arrangement for a pressure container such as a safety containment of a nuclear reactor, wherein a pressure release pipe extends through the containment walls and is closed at its inner end and connected to a drawbar mounted with its other end to a distant point of the container wall. The release pipe has within the containment an area of reduced thickness providing for a design breaking point at which the pipe is caused to rupture when the container is stretched by overpressurization beyond a predetermined point thereby relieving the pressure.With this arrangement, pressure is safely relieved before uncontrolled explosion of the containment but only when absolutely necessary.

Abstract: Device for detecting the operation of a valve, comprising a movable member (15) connected kinematically to a movable part (6) fastened to the closure member of the valve. A detector (24, 25, 26) makes it possible to monitor the displacements or the position of the detection member (15). The detection member (15) has at least one part provided with a predetermined breaking point (20). The kinematic connection between the valve and the detection member (15) can thus be interrupted by the breaking of the member (15) in the event of the jamming of the latter. The invention is in particular applicable to safety valves in nuclear power stations.

Abstract: A modular nozzle system for refueling aircraft fuel tanks includes a nozzle valve linkage mechanism which permits the valve body to have a shorter length than previous designs. The nozzle may include a mechanical fuse for releasing the connection between the nozzle body and a fuel tank upon the application of predetermined forces. The nozzle may also include a swivel joint which facilitates positioning the nozzle for connection to a fuel tank. The nozzle may also include a quick disconnect assembly which facilitates connection of the nozzle to various hose end connection. The system also may comprise an assembly fixture for assembling the mechanical fuse and a test fixture for testing the release force of the mechanical fuse.

Abstract: A butterfly valve or a similar quarter-turn valve is provided with a locking mechanism which permits the disc assembly to be rotated from the open position to the closed position, but prevents the disc assembly from being rotated back to the open position. The locking mechanism includes a cam carried on a rotatable stem supporting the valve disc assembly. The cam has a camming surface including a detent notch situated at a location corresponding to the open position of the disc assembly. A plunger, which is spring loaded into engagement with the camming surface, is urged into the detent notch when the disc assembly is rotated from the open to the closed position and prevents the disc assembly from being rotated back to the open position.

Abstract: A valve assembly for a fluid-containing tank and method of making same are provided wherein such valve assembly is mounted on a saddle fixed to a bottom portion of the tank and such valve assembly comprises a housing structure having a fluid inlet and a fluid outlet defined therein, means for mounting the housing structure against the saddle and within the confines of the tank, and a bottom operable valve member carried by the housing structure and adapted to shut off fluid flow between the inlet and outlet, and wherein the inlet and outlet are defined in the housing structure on a common rectilinear flow axis and the valve member has an opening therethrough which is adapted to be aligned between the inlet and outlet to define the open position of the valve assembly.

Abstract: A hydraulic choking device for use in controlling fluid flow from an oil or gas well, having an improved valve chamber and valve design to reduce parts' wear and facilitate repairs, wherein the chamber is provided with a cavity within the chamber passageway sidewall to which the fluids are initially directed and wherein a ball nose plug is utilized as the valve gate to seal the valve.

Abstract: The operating stem of a rotary valve is rotationally displaced via a detachable valve cap mounted on the stem and to which rotational operating torque is applied. Depending internally from the cap into a rotational interfit with slots provided on a stem lug are a pair of frangible shear pins adapted to shear off and prevent valve damage in response to excessive rotational torque exerted against the cap.

Abstract: The generator unit is of the type including a valve (14,114,214,314) for maintaining a residual pressure. The valve (14,114,214,314) comprises a closure element (32,132,232,332) urged by a spring (42,142,242,342) towards a seat (30,130,230,330). According to the invention, it also includes a temporary retaining member (50,152,252,352) holding off the force of the spring and responsive to at least the presence of brake fluid to release the spring (42,142,242,342). The invention and application may be utilized in hydraulic braking systems for motor vehicles.

Abstract: A dispensing valve assembly comprising a slideable valve sleeve with a radially-directed dispensing outlet movable from closed position axially within a guide portion to open position axially-outwardly of the guide portion. Keying means between the guide portion and valve sleeve ensures that the dispensing outlet is normally directed downwardly but this keying means is flexible and can be overcome to permit twisting of the valve sleeve in the guide portion to break a seal connected therebetween. Finger-engaging means are also provided to facilitate closing.

Abstract: One or more grooves are provided to weaken a portion of the stem nut, retaining nut, or yoke bush in a disk/gate valve to provide selective breakage to limit axially directed forces transmittable through the stem and stem connection. Clearances between the valve body and the non-weakened nut or bush portion to permit axial movement of the latter relative to the former following breakage to provide visual indication of breakage.

Abstract: A quick connect/disconnect coupling assembly (10) defining a fluid flow path is disclosed. The coupling assembly (10) includes a female coupling member (12) adapted for connection to a conduit (14) and a male coupling member (18) adapted for connection to a conduit or container (20). The female coupling member (12) includes a poppet valve assembly (90) which functions as an automatic shut-off when the female coupling member (12) is not interconnected to the male coupling member (18), the male coupling member (18) being adapted for removeable partial insertion into the female coupling member (12). The valve assembly (90) of the female coupling member (12) further includes a needle-like structure (92) for puncturing a penetrable membrane (28) at the front end of the male coupling member (18) upon insertion of the male coupling member (18) into the female coupling member (12) thereby enabling the flow of fluid therethrough.

Abstract: In accordance with the present invention, a container outlet valve assembly (10) is provided including a generally cone-shaped housing (12) extending upwardly into the container, and including radially spaced openings (14) in the housing for lading to flow out of the container. A cone valve (30) is located within the housing containing spaced openings (34) which align with the openings (14) in the cone housing when the cone valve is in open position. A liner (36) of low friction material is attached to the outer surface of the cone valve and/or the inner surface of the cone housing. The cone valve is rotatable to a closed position in which the valve body closes the openings located in the housing (FIG. 3). An unloading chamber (44) is located below the cone valve and is attached to a tank mounting flange (18) with shearable fasteners (24). The flange does not extend below the tank bottom in excess of one (1) inch.

Abstract: A pressure detection arrangement embedded between the skin of a portion of the body and a means used to surround and/or immobilize that particular part of the body, such as a cast. The pressure detection arrangement is a bifurcated capsule having a reservoir cavity and an indicator cavity. A colored fluid is initially contained only within the reservoir cavity by either a frangible disc across the conjunction of the indicator cavity with the reservoir cavity or an extensible bladder within the reservoir cavity. The indicator cavity is transparent or translucent and protrudes through the cast to regions external thereto.If there is swelling of the limb due to medical complications, the skin presses against the capsule and either breaks the frangible disc allowing the colored fluid to pass into the indicator cavity or forces the extensible bladder into the indicator cavity of the capsule. Both methods provide a visual indication in the indicator cavity of excessive pressure on the limb.

Abstract: A solenoid-operated pneumatic valve in which the air vent tube has a nut threaded onto the one end thereof. A first sealing portion of the nut engages the solenoid valve body and a second sealing portion engages the air vent tube to prevent the entry of dirt and moisture into the area of the magnetic coil. The nut is further formed with an undercut portion over which a protective cover is snapped into position. The inside of the cover is provided with a conical portion to deflect the exhaust air for sound damping.

Abstract: A relief valve for use particularly for isolating and for permitting communication between flow passages in a well bore which may include parallel tubing strings connected by an H-Member and a single tubing string and a tubing-casing annulus which communicate through a side-pocket mandrel.