Abstract: A shut off valve, of the type having a normally open main valve that closes in response to a shear force of greater than a predetermined magnitude, and a normally closed secondary valve that opens in response to a predetermined fluid pressure, wherein the main valve is contained in a first sub-housing and the secondary valve is contained in a separate second sub-housing, downstream from the first sub-housing. A hollow, tubular shear fitting, having an annular shear groove, has an upstream end removably coupled to the downstream end of the first sub-housing, and a downstream end removably coupled to the upstream end of the second sub-housing, where by the first sub-housing, the shear fitting, and the second sub-housing are axially aligned so that they define a continuous internal flow passage from the upstream end of the first sub-housing to the downstream end of the second sub-housing.

Abstract: An emergency valve is provided to shut off the flow of fuel in the event a fuel dispenser is struck with sufficient force to rupture the fuel conduit means therefor. The valve comprises a lower housing connected to a source of pressurized fuel and an upper housing connected to conduit means which extend to a dispensing nozzle. The upper housing has a groove which defines the plane of a weakened portion. When the impacted with a relatively high lateral force, the portion of the upper housing, above the groove, will separate, or break away. A normally open, main control, flapper valve is mounted in the lower housing. A poppet check valve is mounted in the upper housing. When the separable portion of the upper housing breaks away, both the flapper valve and the check valve automatically close to minimize spillage of fuel. A bleed valve is provided to relieve pressure in the fuel conduit means to which the separable portion of the upper housing is connected, in the event a fire occurs upon its breaking away.

Abstract: An intake manifold relief valve comprising a valve body (13) having at least two openings, one opening being an inlet (22) for gas and another opening being an outlet (23) for gas to relieve excess pressure, a piston (8) for opening and closing said gas inlet (22) and containing an orifice hole (21) to maintain a constant pressure on both sides of the piston (8); said valve body (13) also cooperating with said piston (8) to form an enclosed gas chamber the size of which is decreased as said piston (8) moves to open said valve, a piston spring (5) applying a force on said piston (8) in addition to that provided by the gas pressure within said chamber to maintain it in a closed position under normal conditions, said piston (8) moving to open said gas inlet (22) when excess pressure within the manifold overcomes the force of said piston spring (5), thereby allowing gas to escape through said valve outlet (23); as the pressure is equalized within the valve through said orifice hole (21), said piston spring (5) wi

Abstract: A predetermined separation fitting for a fluid conduit includes a body and walls in the body defining a predetermined separation point. A force applied to the body above a predetermined value will cause the fitting to separate.

Abstract: A safety valve for fitting into a compressed gas cylinder to terminate gas flow from the cylinder when a primary gas valve attached to the cylinder port of the cylinder is deflected or severed. The safety valve is independently supported in the cylinder port below the location of the primary gas valve. A threaded housing having a channel for the passage of gas to and from the cylinder is threaded into the cylinder port below the location of the primary gas valve. A poppet seat is provided in the housing. A tubular portion of the threaded housing extends up and fits snugly into the gas passage of the primary gas valve. A cylindrical housing having apertures for the passage of gas is attached to the threaded housing. A poppet is provided in the cylindrical housing, which is biased into the poppet seat by a helical spring. The poppet is held off of the poppet seat by means of a frangible element.

Abstract: A safety valve for attachment to a gas cylinder. It has a body rigidly attachable to the port of a gas cylinder, with an inlet and an outlet. A valve between the inlet and outlet is held open by a fragile stem that is maintained in tension. When sufficient bending forces are exerted on the safety valve the stem breaks, its parts move apart from one another, and the safety valve closes.

Abstract: A safety system for a pressurized transfer installation having piping between a storage tank and a flexible transfer hose, includes a shut off valve located in the piping, the shut off valve having selectable closed and open positions, and a cable for mechanically shifting the shut off valve to the closed position, the cable extending to a position remote from the flexible transfer hose.

Abstract: An emergency valve shuts off the flow of fuel in the event a fuel dispenser is struck with sufficient force to rupture the fuel conduit means therefor. The valve comprises a lower housing connected to a source of pressurized fuel and an upper housing connected to conduit means which extend to a dispensing nozzle. The upper housing has a groove which defines the plane of a weakened portion. When the impacted with a relatively high lateral force, the portion of the upper housing, above the groove, will separate, or break away. A normally open, main control, is mounted in the lower housing. A check valve is mounted in the upper housing. When the separable portion of the upper housing breaks away, both the flapper valve and the check valve automatically close to minimize spillage of fuel. A bleed valve is provided to relieve pressure in the fuel conduit means to which the separable portion of the upper housing is connected, in the event a fire occurs upon its breaking away.

Abstract: A system for controlling flow in a well conduit including a landing nipple in the well conduit and a standing valve, which after landing in the landing nipple may be retrieved or expended from the landing nipple. The standing valve permits upward flow and prevents downward flow through the landing nipple and conduit and has a resilient seal which expands into a groove in the landing nipple to provide limited resistance to upward flow moving the standing valve upwardly out of the landing nipple. Sufficient weight on the standing valve or pumping down the conduit with sufficient pressure releases a landing ring on the standing valve to retract, permitting the standing valve to be moved downwardly and expended out of the landing nipple.

Abstract: This invention is concerned with an improved safety rupture disk assembly. This rupture disk assembly, which is designed for a fluid containment vessel, comprises two main parts: a removable rupture disk, and a cover plate. The rupture disk, of course, is designed to rupture, or fail, at a predetermined pressure, and to be easily removed and replaced by another rupture disk in the event of a failure. The cover plate is designed so as to "float" over the rupture disk and automatically seal the opening of the vessel after the pressure within the vessel has been release by disk failure. Additionally, nuts, washers and sealing wires are provided for positively securing the cover plate over the opening resulting from disk failure and for preventing inadvertent securing of the cover plate.

Abstract: A mud saver valve for insertion within the drill string to retain mud in the drill pipe preventing the mud column from flowing past the valve when pumping is interrupted. The mud saver valve includes an internal check valve which permits increased flow of mud upward through the valve when a predetermined downhole pressure is reached. The increased flow of the check valve prevents a blow-out of the plug spear in the event sudden upward pressure is encountered. The check valve forms a part of the plug spear which is removable from the mud saver valve to facilitate the running of wireline tools.

Abstract: A gas regulator includes a housing having a high pressure chamber with an inlet passage thereto, a low pressure chamber with an outlet passage therefrom, and an orifice extending between the high pressure chamber and the low pressure chamber. The low pressure chamber is open at one end and an enclosed bonnet is mounted on the housing across the open end of the low pressure chamber. A movable pressure sensing/control element is mounted across the open end of the low pressure chamber and separates the low pressure chamber from the bonnet. The bonnet is filled with a gas under pressure which applies a force onto one side of the pressure sensing/control element. A valve plug is in the high pressure chamber and is connected to the pressure sensing/control element so as to be movable toward and away from the orifice to open and close the regulator. A spring is connected to the pressure sensing/control element so as to apply a force thereto opposite to the force applied by the gas in the bonnet.

Abstract: An impact damper for a motor vehicle comprises two fluid chambers. These fluid chambers are interconnected by a fluid passage. In case of an impact of the motor vehicle against an obstacle, the fluid flows from one fluid chamber to the other fluid chamber through the throttled passage. If the impact occurs with a high velocity beyond a predetermined velocity, the impact damper behaves like a rigid body. It may therefore occur that the vehicle is damaged to a higher degree than it would in case of lack of the impact damper. For preventing such situation, the passage is provided by perforated and sandwiched discs. One disc acts as a support disc, one other disc acts as a throttling disc. The throttling disc is provided with a weakening line and is broken at a predetermined pressure different between the two fluid chambers. After rupture has occurred, the flow resistance through the passage is reduced and therefore the rigid behavior of the impact damper is eliminated.

Abstract: A safety flow control device in a beverage distribution system using pressurized gas to dispense the beverage from its containers for ensuring that the containers are not accidentally overpressurized. The device is adapted to be placed in the line which connects the pressure source to the container for the beverage. The device includes a base assembly having an internal chamber in communication with a fluid inlet and a fluid outlet and a replacement unit removably connected with the base assembly. The replacement unit embodies a rupture disc having a first side exposed to the gas used in pressurizing the containers and a second side exposed at atmosphere. Strategically positioned between the pressure inlet of the device and the pressure side of the rupture disc is a valving mechanism which is maintained in an open configuration by the rupture disc.

Abstract: A valve-regulator assembly for rendering a high pressure gas source compatible with lower pressure equipment, said valve-regulator being sealable or remote from the high pressure gas source enabling recharging at high pressure.

Abstract: A safety valve device for a compression gas cylinder to shut off gas flow at the tank port of the cylinder when downstream gas flow control apparatus is structurally distrupted is set forth which includes a housing having a conduit therethrough for the passage of gas where the housing is adapted for fitting into the tank port of the cylinder. A poppet seat is located in the conduit and is in a fixed position relative to the tank port. A poppet which passes through the poppet seat is adapted to close the conduit when the poppet bears against the poppet seat. A helical spring is used to bias the poppet to bear against the poppet seat such that the conduit would be normally closed. However, a frangible set-off columnar member is compressively disposed between the poppet and the gas control apparatus such that structural disruption of the gas control apparatus will cause the frangible set-off member to break thereby closing the conduit and preventing gas flow from the compression gas cylinder.

Abstract: A valve-regulator assembly for rendering a high pressure gas source compatible with lower pressure equipment, said valve-regulator being sealable or remote from the high pressure gas source enabling recharging at high pressure.

Abstract: An automatic additive dispenser and system includes a container adapted to be releasably attached to a housing and having a rupturable seal along with means for rupturing the seal and enabling additive to enter a flow of water through the housing, in response to initial water flow through the housing. Additives contained in the bottle are prevented from entering the system before the seal is ruptured, thus enabling predisposition of the bottle in the system for later dispersement of additive without premature leakage of the additives into the system.

Abstract: A snap-action permanently indicating pressure relief valve is disclosed. The valve includes a valve member defining a flow path having an area less than the area of an inlet wherein the inlet pressure initially acts over a portion of a pressure surface of the valve member equal to the inlet area and subsequently acts over the entire area of the pressure surface to suddenly increase the velocity of the valve member. The valve member smacks and permanently deforms a deformable over pressure indicating element to give permanent indication of an over pressure condition.

Abstract: An automatic additive dispenser and system includes a container adapted to be releasably attached to a housing and having a rupturable seal along with means for rupturing the seal and enabling additive to enter a flow of water through the housing, in response to initial water flow through the housing. Additives contained in the bottle are prevented from entering the system before the seal is ruptured, thus enabling pre-disposition of the bottle in the system for later dispersement of additive without premature leakage of the additives into the system.

Abstract: A valve-regulator assembly for rendering a high pressure gas source compatible with lower pressure equipment, said valve-regulator being sealable or remote from the high pressure gas source enabling recharging at high pressure.

Abstract: A pressure release device for sealably mounting on a vessel adapted to contain a fluid under pressure not to exceed a predetermined maximum pressurization limit.

Abstract: There is provided an improved airless paint spray pump having an intake, an inlet valve assembly, a pumping chamber, an outlet, an outlet valve assembly, and stroke pumping means for pumping the fluid paint into the pumping chamber through the intake during the intake stroke and through the outlet on the pumping stroke. The inlet valve assembly includes a flat valve which cooperates with a valve seat at the intake and is displaced from the valve seat during the intake stroke of the pumping means and is seated on the valve seat during the pumping stroke of the pumping means. The flat inlet valve replaces the previous ball type inlet or check valve thereby expanding the design capabilities of the pump.

Abstract: Disclosed is a plug valve for installation in a water supply line which will shut off flow through the line when a downstream emitting element, such as a sprinkler head, is destructively removed from the line. A fracture groove on the exterior of the valve body defines a structurally weakest point and is axially located on the body between an upstream valve seat and a downstream limit stop. The limit stop maintains the valve in an open position during normal operation. Should the downstream emitting element be destructively removed, the supply line will break at its weakest point. The limit stop, being located downstream of the weakest point, will also be removed allowing the valve to close in response to inlet water pressure only, preventing loss of water from the supply line.

Abstract: A valve body having a lateral exhaust port is provided with a valve movable toward and away from a fluid inlet sealing face at its pressure connected end and guided by a valve stem projecting through the other end of the body and terminating in spaced relation with respect to a cap closing the end of the body opposite its inlet port. An axially collapsible member is axially interposed between the downstream end of the valve stem and the cap to normally maintain the flow passageway between the ports closed. Excessive fluid pressure against the valve at the inlet port collapses the collapsible member, unseats the valve and opens the fluid discharge passageway.

Abstract: A frangible pressure relief disc assembly is disclosed which is adapted to fit into a positive displacement pump on the suction side of each cylinder. The disc assembly provides a pressure relief when the fluid passing through the pump encounters a closed valve or other obstruction in the line. The disc assembly comprises: (a) a support member having a first side and a second side which is penetrated by a passage (e.g., a bore ) providing fluid communication from the first side to the second side, and (b) a pressure frangible disc fixedly attached to the support member and positioned to form a fluid-tight seal covering the passage.

Abstract: A gas pressure reducing regulator for use with high inlet pressures is provided. The regulator includes a diaphragm plate for shielding the diaphragm from deleterious effects of flame and debris during unwanted combustion.

Abstract: A propellant storage construction having a chamber for storing the propellant and a passage leading to the chamber and containing a valve unit therein for opening and closing the passage, the passage having a flow restricting unit therein intermediate the valve unit and the chamber to limit the flow rate of the propellant from the chamber through the valve unit to a certain low flow rate when the valve unit is in an open position to dispense the propellant. The flow restricting unit has a part thereof providing a full flow rate therethrough at a substantially greater flow rate than the certain low flow rate when the valve unit is in an open position to permit a charge of the propellant to be fed through the open valve unit to the chamber for filling the chamber with the propellant.

Abstract: Improved fluid pressure discharge safety system for automatically detecting nd simultaneously suppressing opposed exhaust streams of an accidentally fired and stored missile. The system is generally made up of first and second nozzles for discharging sprays of fluid under pressure. The first nozzle is provided with an exhaust detection arrangement. This arrangement includes a discharge control plug that maintains the first and second nozzles in a securely closed condition for preventing discharge of pressure fluid from either nozzle. However, the detection arrangement, when impacted by an exhaust stream, causes ejection of the fluid pressure discharge control plug from the first nozzle thereby opening the first nozzle for discharge of pressure fluid therefrom. A first valve of novel construction is operatively associated with the plug and controls the operation of a second valve. The second valve controls the discharge of pressure fluid from the second nozzle.

Abstract: A fluid-tight connection between a pair of pipes containing hydraulic fluid is formed by a pair of connectors of the invention. Each connector has a body part engaged respectively with the pipes, the body parts being coupled together by a coupling sleeve which engages a shoulder 20 of one of the body parts and is locked to the body parts by a circlip 23 engaged within grooves 22 and 25 respectively in the other body part and the sleeve. Each body part has a respective seal member each incorporating a diaphragm sealing over an end of its associated body part and a bead engaging the internal wall of the sleeve. Air trapped between the diaphragms is expelled past the seal members during insertion of the connector parts into the sleeve. Application of system pressure subsequently ruptures the diaphragms to establish communication between the pipes and urges the seals outwardly to seal against leakage of system fluid.

Abstract: In accordance with the invention, a full opening check valve is provided which will close in response sustained high velocity flow through the valve. In one embodiment, a downhole blowout preventer is provided having a rigid outer sleeve which may be interspaced within a casing string near its lower end for insertion into a bore hole. The downhole blowout preventer has an inner sleeve including an upwardly longitudinally collapsible tube within the outer sleeve. The tube may be composed primarily of rubber or the like. The inner sleeve includes a surface for developing an upwardly acting collapsing force responsive to the upward flow of well fluids through the blowout preventer.

Abstract: A compact, light weight fluid flow control device adapted to be interconnected between a source of fluid under pressure and a normally stowed inflatable system such as a safety slide or flotation unit. The device uniquely initiates fluid flow between the source and the inflatable system by means of either a pyrotechnic device or a redundant mechanical system. Once fluid flow has been initiated, the device uniquely regulates and controls the flow of fluid toward the inflatable system.

Abstract: A quick-disconnect fitting for quick connection or disconnection of an oxygen line, for receiving a gas line plug of the type having a plug flange to provide gas to an oxygen line terminated by the plug. A metal valve body has a threaded inner end for being threadably received by a source of pressurized oxygen and an outer end carrying a molded plastic cap having a receptacle for receiving the plug. The valve body includes a plunger-type valve axially shiftable therein between open and closed positions, the valve carrying at its upper end a poppet for sealing engagement with a valve seat of the valve body when the valve is closed. A compression spring surrounds the valve for urging it into closed position. A nose of the plug engages and maintains open the valve member when the plug is received within the cap for receiving gas from the source. The cap carries a locking plate for selective locking engagement with the plug flange when the plug is received.

Abstract: In the representative embodiment of the invention disclosed herein, a disc valve is cooperatively arranged to include a disc member of a ductile material which is transversely positioned within an enlarged chamber in the axial bore of a tubular housing and sealingly secured to the housing. A piston-actuated tubular mandrel having a forward position defining a slanted annular cutting edge with a notch on one side thereof is arranged in the housing so that as the mandrel is advanced against the disc, the inclined cutting edge will progressively sever the central portion of the disc from its peripheral portion and progressively bend that part of the central disc portion disposed in the notch outwardly to confine the central disc portion between the housing wall and the exterior of the mandrel.

Abstract: In accordance with an illustrative embodiment of the present invention, a pressure relief valve comprises a valve body having an inlet passageway and a valve seat surrounding the passageway, a valve element normally engaging the seat to close the passageway; and a shear mechanism for enabling the valve element to disengage from the seat at a selected relief pressure, the mechanism including a bar that engages the valve element and is pivotally mounted on the valve body to one side of the axis of the passageway, a link also pivotally mounted on the valve body to the other side of the said axis, and a frangible member having a non-circular cross-section and being received in aligned holes in the bar and link, one of which has holes of companion cross-sections with that of the frangible member.

Abstract: A valve housing is adapted to be supported on a tubular member, there being bore means in the valve housing. Passage means are provided in the tubular member and in the valve housing for communicating fluid from the interior of the tubular member through the bore means to the interior of an inflatable element carried by the tubular member for inflation of the inflatable element. First valve means in the bore means control fluid flow into the bore means, and second valve means in the bore means control fluid flow from the bore means to the inflatable element. Means retain the second valve means in position in the bore means to close off flow to the inflatable element until a first predetermined pressure is reached in the bore means and for releasing the second valve means so that it may move to communicate the bore means for flow to the interior of the inflatable element when the first predetermined pressure is reached.

Abstract: A dump valve for use in a downhole motor having a spring-based piston responsive to fluid flow to close a fluid flow port and to a ball actuated force to reopen the port.

Abstract: A safety flow control device for use in a beverage distribution system of the character using pressurized gas to dispense the beverage from its containers for ensuring that the containers are not accidentally overpressurized. The device of the invention is adapted to be placed in the line which connects the pressure source to the containers for the beverage. The device embodies a rupture disc having a first side exposed to the gas used in pressurizing the containers and a second side exposed to atmosphere. Strategically positioned between the pressure inlet of the device and the pressure side of the rupture disc is a valving mechanism which is maintained in an open configuration by the rupture disc. In the open configuration the valving mechanism permits the gas to flow from the inlet into a first sub-chamber defined by the first side of the rupture disc and then outwardly through the outlet of the device.

Abstract: A rupture disk assembly is provided which after rupture and pressurized fluid relief, recloses itself to prevent backflow therethrough. The assembly is comprised of a hollow rupture disk support member having a pressurized fluid inlet opening at one end and at least one pressurized fluid discharge port at the other end. A rupture disk is sealingly attached to the support member whereby until the rupture thereof, pressurized fluid is prevented from flowing through the support member to the discharge port therein.

Abstract: A valve useful for connecting a source of fluid under pressure to a using apparatus upon actuation of an explosive squib. The connecting structure includes an outer tube of soft material within which there is disposed an additional tube of material having a frangible area. The inner and outer tubes define an annular space and an inner tubular space. One of the spaces is connected to the source of fluid under pressure, while the other of the spaces is connected to the using apparatus. Particularly, the inner tubular space is connected to a source of gas under pressure, while the outer annular area is connected to the using apparatus. Upon actuation of the squib the inner frangible tube is broken at the frangible area upon a bending of the outer tube without its fracturing thereby connecting the source of fluid under pressure to the using apparatus, while at the same time isolating the products of combustion of the squib.

Abstract: A breakaway coupling for joining together two pipes the coupling having at least two separable parts, through which a conduit extends along which fluid is to be conveyed, one part being adapted for connection to one pipe and the other part being adapted for connection to the other pipe, the two separable parts being secured together by frangible means, the parts defining therebetween a fluid chamber in fluid pressure communication with the conduit, the chamber serving to subject the parts to a fluid pressure force for urging the parts together.

Abstract: There is disclosed a safety device for releasing excessive pressure in a pressurizable container having a pressure release outlet, rupturable closure element in the form of a membrane which hermetically seals the outlet, a cutting device arranged to rupture the closure element when a predetermined maximum pressure in the container is exceeded, a rigid retaining device which holds the cutting device in a position out of engagement with the closure element when the container pressure is less than the predetermined maximum pressure, and a predetermined weakening provided on the retaining device which breaks when the predetermined maximum pressure is exceeded so as to allow the cutting device to move under the action of the pressure in the container so as to rupture the closure element. The retaining device is rigidly connected to the cutting device, and the latter is rigidly connected to a first plate.

Abstract: A differential fill valve assembly for application in float collars or shoes in well casing. The valve assembly comprises a back pressure flapper valve disposed within a substantially tubular upper housing, and a lower housing containing an activating sleeve slidably disposed therein above a double flapper valve assembly. The activating sleeve initially extends into the upper housing to a sufficient extent to maintain the flapper valve in an open position; the activating sleeve is maintained in this position through use of shear pins, by which it is secured to the lower housing. The double flapper valve comprises a first flapper responsive to pressure below the valve assembly, and a second flapper responsive to force applied from above.

Abstract: A propellant storage construction having a storing chamber for storing the propellant and a passage leading to the storing chamber and containing a valve unit therein for opening and closing the passage. The construction has a pressure regulator operatively associated with the valve unit for operating the valve unit in relation to the pressure of the propellant, the pressure regulator comprising a self-contained capsule having a movable wall for engaging the valve unit and an opposed wall spaced therefrom by a side wall. The construction has a wall cooperating with the capsule to define an output chamber for receiving propellant dispensed from the storing chamber through the valve unit. An annular sealing member is disposed between and against the capsule and the wall to define the output chamber therebetween.

Abstract: A plastic vent valve apparatus for use in connection with storage containers provides for equalization of the internal pressure of the container. Air is admitted into the container in response to a partial vacuum, while fumes or fluid contents of the container are expelled in response to over-pressurization of the container to prevent explosion of the container. Moderate over-pressurization resulting from normal expansion of the contents is relieved by venting of the fumes or liquid contents by means of a valve mechanism. Severe over-pressurization requiring rapid venting is better accommodated by ejection of a thin-walled break-away portion of the upper housing defining a large unobstructed vent aperture. Finally, under severe fire conditions the melting of the plastic valve components may provide a yet larger aperture for maximum venting.

Abstract: An apparatus for detecting ruptures in a drill pipe above and below the drill collar comprising a nose cone, a lower body threadably engaged to the nose cone. The lower body has a structure defined by a plurality of circulation by-pass apertures and shear pin apertures. A cylinder actuator having actuator apertures is installed within the lower body juxtaposed to the shear pin apertures. Shear pins slideably lodge through the shear pin apertures of the lower body into the actuator apertures of the cylinder actuator. A steel ball seats on top of the cylinder actuator. An upper body threadably engages the lower body and a retrieval cap threadably engages the upper body. The apparatus seats into a seating sub in operation of the invention.

Abstract: A well system in which a dual annular type valve with wall flow ports, operable by ambient pressures, is utilized as part of the well tool string to provide an unrestricted flow path for production through and prevent excess back pressure on the producing formation. The valve has outside seals and internal valves above and below the wall ports controlling flow therethrough. Higher pressure outside the valve will open the biased closed lower sleeve valve to production flow through the wall ports into the flow path through the well production tubing. If pressure in the flow path through increases, both valves close preventing flow out through the wall ports. Increasing flow path pressure to a predetermined value shears lower valve seat positioning pins to open wall flow ports to high volume flow pumped into the formation to kill the well and to two-way flow afterward.

Abstract: A control valve for a passageway in which the valve is reciprocated toward and away from its seat by pressure within a pressure dome and pressure exteriorly of the valve housing and in which reciprocation is controlled by a J-slot capable of latching the valve in open position while being run and releasing the valve for reciprocation after being landed in the well together with a frangible disc which may be ruptured to permit flow past the valve member; said valve being used to control flow through a H mandrel in a pumpdown system.

Abstract: A hose-break valve comprises a valve housing (2) and a sliding gate (1) movable therealong and is connected with a pressure hose (5) which is surrounded by a protective sleeve (14), while defining a space (13) filled with a pressure medium. The sliding gate (1) is under the action of, on the one hand, the pressure medium in said space (13) and, on the other hand, a loading device (17) acting opposite the pressure medium. First and second pressure relieving devices are provided for closing the valve by means of the loading device (17) when the pressure of the pressure medium in said space (13) respectively exceeds an upper limit value and falls short of a lower limit value.

Abstract: A liquid level valve for use in filling a liquid storage tank to control (in response to increased air pressure within the liquid level valve) the tank emergency loading valve which is held open by pressurized air.The liquid level valve has an air control cavity connected to the pressurized air and an actuating cavity which exhausts to the atmosphere and is disposed above the air control cavity and connected to it via an actuating passageway. An air control diaphragm divides the air control cavity into upper and lower portions and controls the flow of pressurized air into such lower portion which exhausts to the atmosphere. The air control diaphragm has a small air control passageway (of smaller diameter than the actuating passageway) allowing pressurized air into the air control cavity upper portion, thus permitting the pressurized air to act on both sides of the air control diaphragm.