Abstract: A water control valve of a faucet comprises a water control body; a water-stop ring having a water outlet slot; a water guiding disk having a round shape; a lateral surface of the water guiding disk being formed with a protrusion for resisting against a lower annular surface of the water control body; a water inlet seat being at a lowest end of the water-control valve; the water inlet seat having a recess; a through hole being formed in a center of the recess and a plurality of water inlets being positioned around the through hole; and a water-stop unit having a base and a tapered rod extends from a center of the base; the base resisting against a bottom of the recess and located upon the plurality of water inlets; and an annular flange being formed on the tapered rod near the base.

Abstract: A backflow prevention system that helps prevent contamination of potable water distribution systems from backflow at fire hydrant connections.

Abstract: A fluid flow control valve is disclosed. This valve includes a housing which defines a central passageway having fluid inlet and fluid outlet openings. A pressure responsive element is disposed within the passageway for selectively opening and closing the inlet opening to fluid flow in response to fluid pressure exerted thereon at the inlet opening. A mechanism is provided within the passageway for exerting a bias force against the pressure responsive element which is sufficient to close the inlet opening to fluid flow absent a pre-established level of fluid pressure exerted on the pressure responsive element. A fluid filter element is also disposed within the passageway; and a retainer device is positioned for removably securing the filter element within the passageway.

Abstract: A freezeless wall hydrant has a normally horizontal fluid inlet tube with an interior end and exterior end. A hollow valve fitting is rigidly secured to the interior end of the inlet tube for a connection to a source of pressurized fluid. A valve seat is located on an interior end of the valve fitting. A valve body is longitudinally movably mounted in the inlet tube adjacent to the valve fitting. A pressure relief valve is mounted on the inlet tube between the interior and exterior ends thereof so that if residual water within and adjacent the exterior end of the inlet tube freezes and exerts pressure on residual fluid within the inlet tube adjacent the interior end thereof, the pressure relief valve will actuate to purge some of the high pressure fluid to decrease the pressure being exerted by such fluid to the interior of the inlet tube.

Abstract: A frost free faucet having a spigot assembly including a drain conduit, a sleeve assembly including an elongated pipe, and a valve assembly. The valve assembly including a ¼ turn valve and a check valve. The ¼ turn valve includes a rotatable disc with an inlet and a stationary disc with a through hole. Each disc is formed of a ceramic material, wherein upon turning the rotatable disc 90 degrees in a first direction the inlet and the through-hole align to an open position and upon turning the rotatable disc 90 degrees in a second direction, the inlet and the through-hole misalign to a closed position.

Abstract: Fire hydrants which feature additional structure for reducing the potential that those with ill intent can foul municipal water supplies by introducing toxins or other materials into fire hydrants. Various embodiments include valves which close off portions of the hydrant otherwise available for receipt of toxic or other materials when the fire hydrant nozzle cap is unscrewed and open. Such valves preferably open, manually or automatically, when water is flowing from the water supply through the nozzle, a condition which renders it difficult at best to introduce toxins through the hydrant into a water supply, but close off portions of the barrel when the nozzle is open and water is not flowing through the nozzle.

Abstract: A freezeless wall hydrant has a normally horizontal fluid inlet tube with an interior end and exterior end. A hollow valve fitting is rigidly secured to the interior end of the inlet tube for a connection to a source of pressurized fluid. A movable ball is located with a fluid conduit that extends from the interior of the inlet tube to the location of the potable water source. When the water pressure inside the inlet tube increases because of the presence of ice, the high pressure of such water moves the ball to open fluid flow of the high pressure fluid to the source of potable water which will be at a lower pressure, thus reducing the fluid pressure within the inlet tube and saving it from rupture.

Abstract: A tool and method of utilizing the tool to release pressurized gas trapped between a main valve and a safety valve of a portable liquified petroleum gas tank is disclosed. The tool includes a tank safety valve release member structured to be coupled with the outlet of the fuel tank. The tank safety valve release member is configured to be inserted into the tank outlet and move the tank safety valve to an open position so that pressurized gas can escape to atmosphere.

Abstract: A valve proportioning assembly that incorporates a check valve assembly is improved in manufacture and assembly. The valve proportioning assembly includes a housing having a blind opening that receives a sub-assembly of two separate non-metallic components that mate via an interference fit or snap-fit together enclose the check valve assembly. The non-metallic components enclose the check valve assembly. It includes a spring and spring follower so that a sub-assembly is formed for insertion into a blind bore. This minimizes potential misassembly, provides for a wider array of design configurations, and offers the additional advantage of adding more complete informational indicia directly into the molded components.

Abstract: An electrically operable valve assembly having an integral pressure regulator provides ease of installation and compact packaging for a water supply control system. The valve assembly is particularly useful for systems that control household water supplies to prevent flooding, but is also useful in other applications such as agricultural and industrial systems where water pressure determined water flow volume must be predicted accurately. The valve may also incorporate a flow meter having a positive flow characteristic permitting determination of very low flow rate flow and the valve may incorporate a manual control. All of the controls and features are integrable within a compact package that occupies essentially the same volume and piping space as a conventional electrically operable valve.

Abstract: A check valve construction is provided which includes a housing having a first flow path and a second flow path. Liquid flow is controlled within the first and second flow path by movable plungers (22, 24) having a sealing surface and a plurality of prongs that control the length of movement of the plunger within the housing. One of the plungers permits liquid flow while the other of the plungers prevents liquid flow in response to pressure change within the flow paths.

Abstract: A method for automatically feeding a closed liquid system from a liquid source according to need by creating between the liquid source and the closed liquid system a load buffer formed from liquid, in which between the liquid source and the feed buffer only liquid flow in the direction of the feel buffers is allowed and from the feed buffer to the closed liquid system only drorpwise liquid transport is admitted. The feed buffer can be realized with a cylindrical drip feeder with inlet, outlet and freely movable plunger, which can close the outlet in an abutting position while leaving clear a minuscule leakage channel and is provided with a passage with a non-return valve in the direction of the inlet. Such a drip feeder can, with or without insertion of a storage container for liquid, be connected with, for instance, a liquid system, such as a central heating system with pipe system, boiler and expansion tank.

Abstract: A valve assembly, including a quarter turn ball valve, an insert carried by the valve housing, and a flange, rotatably carried on the insert. The flange is used to secure the valve assembly in a fluid system and the assembly and disassembly of the valve assembly is facilitated by the adjustable position of the flange.

Abstract: A nonrefillable valve is provided that allows for an initial filling of a container, but prevents subsequent refilling of the container. The valve operating assembly includes a valve stem and a valve core which is slidably received in the distal end of the valve stem. In a first position, the valve core resides above a rim or protrusion within the chamber. After filling of the container, a second position is defined when the valve stem is operated to force the valve core beyond the protrusion and in seating engagement with a valve seat, thus sealing the container. The valve is then selectively operated in a third or open position to discharge the container as desired. Subsequent refilling of the container is prevented by the force of fluid reentering the valve which forces the valve core to its seated engagement with the valve seat.

Abstract: A freezeless wall hydrant has a fluid inlet end connected to a source of pressurized water, and a fluid outlet end. A check valve is placed in the bore of the valve body and is spring loaded to open only when extreme water pressure within the inlet valve lifts a spring loaded piston element to permit the highly pressurized water to move through the bore in the valve body and be relieved as it escapes rearwardly into the original source of pressurized water.

Abstract: A water treatment unit is disclosed which can be mounted directly on the faucet or tap of the user's sink and which contains one or more water treatment media and an operating valve which permits the selection of several operating modes including service, spray and stream modes. In the service mode the water is treated by at least one if not all of the various water treatment media contained in the unit housing after which the water is discharged from the valve of the unit for service use, and the service discharge may be adjusted to direct the treated water as desired by the user. The valve of the treatment unit includes a housing, a stationary member, a slide member and a rotatable switch member unit and may also be operated in a backflush mode in which water may be directed in the reverse direction through at least one of the water treatment media to regenerate that media.

Abstract: A freezeless wall hydrant has a normally horizontal fluid inlet tube with an interior end and exterior end. A hollow valve fitting is rigidly secured to the interior end of the inlet tube for a connection to a source of pressurized fluid. A valve seat is located on an interior end of the valve fitting. An elongated hollow tube of a diameter less than the interior diameter of the inlet tube is positioned on the center line of the inlet tube and has inner and outer ends. A plug is rigidly secured to the inner end of the tube to close the inner end for fluid flow. A normally closed check valve is movably mounted in the tube to engage a valve seat on the plug, to open the tube for fluid therein under conditions of high fluid pressure in the inlet tube.

Abstract: In a hydraulic relief valve having a main poppet draining into a pressure-oil tank hydraulic fluid flowing into a sleeve from a hydraulic pump and a pilot poppet draining into the oil tank the hydraulic fluid upon the occurrence of a high pressure over a pressure value set in a back-pressure chamber of the sleeve, an annular interference-preventing projection is provided to be formed in an outer periphery of the sleeve to be placed at boundary portions of feedback paths of feedback fluid on the side of the main poppet which is drained past a throttle of the sleeve and feedback fluid on the side of the pilot poppet which is drained past a feedback fluid path formed outside the sleeve.

Abstract: A non-refillable valve for a pressure container, which comprises a non-refillable device comprising of a spring loaded port sealing member having an end T-piece and a plug to hold the spring is provided at the outlet nozzle such that when the valve is in the active position of filling, the stem of the spindle is in the lifted position and the port sealing member is in the pulled position by means of the spring, thereby providing a communication between outlet nozzle and the container for filling and after completion of filling, the end T-piece is pulled and cut off whereby the port sealing member gets retracted, because of the spring, to seal the side port and thereby preventing the flow of fluid in the filling direction while permitting flow of fluid in the opposite direction for discharging.

Abstract: A counter-flow prevention valve is disposed within a body of a pilot-type channel valve. While electrical power is applied to a solenoid coil and the pilot-type channel valve is opened, i.e., while a gas is flowing through the counter-flow prevention valve and the gas is expanding, heat generated by the application of electrical power to the solenoid coil is conducted via the body and is effectively transferred to the counter-flow prevention valve. Therefore, even if the gas contains water vapor and even if this gas is cooled due to significant expansion, the water vapor can be prevented from freezing within the counter-flow prevention valve. Moreover, the volume of the pipe between the pilot-type channel valve and the counter-flow prevention valve is small, thereby resulting in a fast rise in pressure within the pipe and a quick opening of the counter-flow prevention valve, which provides an excellent valve-opening response.

Abstract: A valve assembly includes a valve body having a passageway and first and second oppositely facing valve seats that extend around the passageway. First and second valve elements are positioned in the passageway to seal against the respective valve seats, and a spring biases the first valve element to the closed position against the first valve seat. The valve seats are spaced sufficiently closely together along the passageway that the first valve element, when positioned against the first valve seat, holds the second valve element away from the second valve seat. For this reason, the spring also biases the second valve element away from the second valve seat.

Abstract: A valve assembly includes a housing defining a main chamber having an inlet connectable to a source of pressurized fluid, and an outlet; a first valve within the main chamber normally closing the main chamber outlet but automatically opening its outlet in response to a first predetermined pressure within the main chamber; an intermediate chamber communicating with the main chamber outlet; and a second valve having an inlet communicating with the intermediate chamber, and an outlet for discharging fluid from the chambers. The second valve is normally closed but automatically opens in response to a second predetermined pressure slightly higher than the first predetermined pressure, such that the second valve reduces or eliminates drippings in the discharge of fluid from the chambers particularly during low rates of flow of the fluid into the main chamber via the main chamber inlet.

Abstract: A device for controlling the output of rotary compressors which includes a housing (8) formed of two housing parts which define connection flanges (1, 3) at opposite ends thereof and which define a dividing plane (13) therebetween that is slanted toward the plane of the connection flanges (1, 3) on both sides between a regulating flap valve (4), which controllably changes the passage cross-section of the suction duct, and a check valve (7) that is arranged behind the flap check valve in the direction of flow. The housing (8) may be assembled in different relative positions of the two housing parts (14, 15), which makes manufacturing simpler and more cost-effective and makes possible different relative positions of the two connection flanges (1, 3) to one another.

Abstract: A valve inspection chamber includes a housing having a vertical inspection and valve retrieval opening. A valve cassette is provided which includes a frame and a valve member movable relative to the frame between an open position and a closed position. A valve cassette receptacle is positioned in the housing. The valve cassette is inserted and retrieved through the vertical inspection and valve retrieval opening of the housing using a retrieval tool.

Abstract: A valve assembly includes a housing defining a main chamber having an inlet connectable to a source of pressurized fluid, and an outlet; a first valve within the main chamber normally closing the main chamber outlet but automatically opening its outlet in response to a first predetermined pressure within the main chamber; an intermediate chamber communicating with the main chamber outlet; and a second valve having an inlet communicating with the intermediate chamber, and an outlet for discharging fluid from the chambers. The second valve is normally closed but automatically opens in response to a second predetermined pressure slightly higher than the first predetermined pressure, such that the second valve reduces or eliminates drippings in the discharge of fluid from the chambers particularly during low rates of flow of the fluid into the main chamber via the main chamber inlet.

Abstract: The invention is a device and method in a high-pressure chromatography system, such as a supercritical fluid chromatography (SFC) system, that uses a pump as a pressure source for precision pumping of a compressible fluid. The preferred exemplary embodiment comprises a pressure regulation assembly installed downstream from a compressible fluid pump but prior to combining the compressible flow with a relatively incompressible modifier flow stream. The present invention allows the replacement of an high-grade SFC pump in the compressible fluid flow stream with an inexpensive and imprecise pump. The imprecise pump becomes capable of moving the compressible fluid flow stream in a precise flow rate and pattern. The assembly dampens the damaging effects of an imprecise pump, such as large pressure oscillations caused by flow ripples and noisy pressure signals that do not meet precise SFC pumping requirements.

Abstract: An activating pin which comprises a valve part, the piston part comprises within it a channel, the cross-section of said channel is, at least one part of said piston part, consisting of sectors, wherein in each sector the distance between the center point of the channel cross-section and the outermost limiting surface of the channel is larger than the corresponding distance measured along the line separating the sector from an adjacent sector, and said valve part is positioned movably with respect to said piston part between a first valve position and a second valve position for enabling the conduction of gaseous and/or liquid media through said channel when said valve part is in said first valve position, and inhibiting the conduction of gaseous and/or liquid media through said channel when said valve part is in said second valve position.

Abstract: A two-way valve is disclosed comprising at least two lateral openings which can be shut off by a piston provided with an axial orifice for the passage of gas, which piston slides axially in the casing between a position in which the openings are shut off under the influence of a spring and an open position counter to the action of the spring under the influence of the pressure of the filling gas, and a level valve activated by a float at the bottom of the casing. In order to prevent pressure from building up inside the casing after closure, the latter is provided with vent orifices. A seal member is arranged on the piston to cover or uncover the vent orifices.

Abstract: An automatic manifold for a catheter assembly. Valve means automatically open and close flow between a liquid supply port for connection to injection means and a liquid delivery port for communication with the catheter assembly. A pressure sensor is integrated into the manifold. The manifold also includes a quick-disconnect coupling mechanism for a liquid supply port.

Abstract: A dummy undersea hydraulic coupling member is disclosed for protecting an opposing undersea hydraulic coupling member when the hydraulic lines are not operating. The dummy undersea hydraulic coupling member has a water displacement expansion chamber with a piston therein that allows trapped water and/or air to move from the receiving chamber to the water displacement expansion chamber during connection of the dummy coupling member to the opposing coupling member.

Abstract: An accommodation portion (53) is formed at a position where it faces a check valve member (42) through a chamber inlet (41a) of a check valve chamber (41). An opening means (51) is attached in the accommodation portion (53). This opening means (51) switches over between a valve opening position (Y) and a valve-opening cancellation position (X). A lock means (55) is attached between a peripheral wall of the accommodation portion (53) and the opening means (51). The lock means (55) changes over between a lock position (L) where it limits an advancement of the opening means (51) from the valve-opening cancellation position (X) and a lock cancellation position (M) where it allows the advancement. A valve-opening actuation means (60) is provided with a lock cancellation means (61). A magnetic force is made to occur between the lock cancellation means (61) and the lock means (55). The magnetic force changes over the lock means (55) to the lock cancellation position (M).

Abstract: A pressure control valve, which has a main valve for control, capable of opening and closing a valve hole by means of a diaphragm, and controls the pressure of a fluid by the agency of the main valve for control, comprises a non-return auxiliary valve located around the main valve for control so as to be coaxial therewith. The non-return auxiliary valve includes a cylindrical portion to be guided by a valve guard body having the valve hole therein and an annular rib extending outward from one end of the cylindrical portion. The rib can engage an auxiliary-valve seat on an outlet-side case.

Abstract: A fluid flow control valve is disclosed. This valve includes a housing which defines a central passageway having fluid inlet and fluid outlet openings. A pressure responsive element is disposed within the passageway for selectively opening and closing the inlet opening to fluid flow in response to fluid pressure exerted thereon at the inlet opening. A mechanism is provided within the passageway for exerting a bias force against the pressure responsive element which is sufficient to close the inlet opening to fluid flow absent a pre-established level of fluid pressure exerted on the pressure responsive element. A fluid filter element is also disposed within the passageway; and a retainer device is positioned for removably securing the filter element within the passageway.

Abstract: A nonrefillable valve is provided that allows for an initial filling of a container, but prevents subsequent refilling of the container. The valve operating assembly includes a valve stem and a valve core which is slidably received in the distal end of the valve stem. In a first position, the valve core resides above a rim or protrusion within the chamber. After filling of the container, a second position is defined when the valve stem is operated to force the valve core beyond the protrusion and in seating engagement with a valve seat, thus sealing the container. The valve is then selectively operated in a third or open position to discharge the container as desired. Subsequent refilling of the container is prevented by the force of fluid reentering the valve which forces the valve core to its seated engagement with the valve seat.

Abstract: The invention concerns a device for controlling a fluid flow, characterised in that said device comprises second valve arrangement means interposed in the circuit in series with first valve arrangement means (20, 22, 34), and wherein a second mobile closure element (38) moves between a pressing position, wherein it is pressed on the seat (32) of a second threshold (30) and an opening position wherein the second closure element (38) is spaced apart from the second seat (32) to allow the fluid through the second threshold (30), and in pressing position, the second closure element (38) allows a reduced flow of the fluid through the second threshold (30).

Abstract: A fluid flow control valve is disclosed. This valve includes a housing which defines a central passageway having fluid inlet and fluid outlet openings. A pressure responsive element is disposed within the passageway for selectively opening and closing the inlet opening to fluid flow in response to fluid pressure exerted thereon at the inlet opening. A mechanism is provided within the passageway for exerting a bias force against the pressure responsive element which is sufficient to close the inlet opening to fluid flow absent a pre-established level of fluid pressure exerted on the pressure responsive element. A fluid filter element is also disposed within the passageway; and a retainer device is positioned for removably securing the filter element within the passageway.

Abstract: A dripless hose bib for connection to a pressurized water source pipe. The dripless hose bib has a valve body having an inlet port, an outlet port and a fluid passageway connected between them. The front end of the valve body has an external garden hose thread. A ball valve is positioned in the fluid passageway. An aperture in the top surface of the valve body communicates with the ball valve. A vertically oriented valve stem has its bottom end detachably connected to the ball valve and its top end is connected to a transversely extending lever handle. A valve body plug is screwed into the rear end of the valve body and it in turn has a threaded bore in its rear end that threads onto the pressurized water source pipe.

Abstract: The invention relates to a shut-off apparatus for the charging device of a pressure vessel, especially for the storage of cryogenic liquefied gases, having a shut-off valve with a valve housing and a valve body stressed by a closure spring which, in order to charge the pressure vessel, can be brought into the open position against the force of the closure spring, having an apparatus for locking the valve body in the open position of the valve and having a release apparatus subjected to the action of the vessel pressure, which causes the apparatus to release the lock if a predetermined threshold vessel pressure is exceeded.

Abstract: A thermal safety device for cutting off gas pipelines, wherein gas transfer is prevented by the safety device when temperature increases in the section of the gas pipeline placed downstream from the safety device, especially when connected gas apparatuses are in a closed position maintains production costs and dimensions at a level as low as possible. The safety device includes a check valve which prevents backflow from the gas pipeline which is placed downstream from the device. The inventive device also includes a pressure sensitive element placed downstream from the safety device which is actuated by the pressure in the pipeline. The pressure sensitive element is coupled to a cut-off valve in such a way that when pressure increases in the downstream pipeline the valve prevents gas from flowing into the pipeline.

Abstract: A freezeless wall hydrant has a fluid inlet end connected to a source of pressurized water, and a fluid outlet end. A check valve is placed in the bore of the valve body and is spring loaded to open only when extreme water pressure within the inlet valve lifts a spring loaded piston element to permit the highly pressurized water to move through the bore in the valve body and be relieved as it escapes rearwardly into the original source of pressurized water.

Abstract: A fluid handling assembly that includes a modular strut removably secured to a valve that permits easy access to internal valve parts for repair and inspection.

Abstract: A service coupling is provided that includes a body portion and an axially moveable valve housing disposed in a central passageway of the body portion. The valve housing includes at least one pressure balancing passage extending therethrough and a service valve sealingly engaged within an inner cavity of the valve housing. An actuator moves the valve housing to a forward position that causes the service valve to abut a port valve of a refrigerant system inlet port and disengage the service valve from sealing engagement within the cavity to open a flow path. The axial movement of the valve housing to the forward position also creates a void between the valve housing and the body portion. The void is provided in communication with the flow path by the at least one pressure balancing passage, such that the refrigerant pressure is substantially balanced on either end of the valve housing.

Abstract: A variable-delivery high-pressure fuel pump having a pump chamber varying in volume as a plunger moves in and out, an inlet port valve forming a part of chamber walls of the pump chamber, the inlet port valve being opened when a low-pressure fuel is admitted into the pump chamber, while being closed when the admitted fuel is delivered out of the pump chamber, a control chamber on an opposing end of the inlet port valve to receive the low-pressure fuel from the fuel inlet passage, and a control valve for intermittently opening and blocking a fluid communication between the control chamber and the fuel inlet passage. The inlet port valve is a poppet valve made with a valve head having a valve face moving off and reseating against a valve seat in the pump chamber, and a valve stem integral with the valve head and extending out of the pump chamber into the control chamber.

Abstract: A backflow preventer assembly includes a housing having a first end and a second end, a first mounting assembly configured to removably secure a first check valve at a region of first end of the housing, and a second mounting assembly configured to removably secure a second check valve at a region of the second end of the housing. The housing includes a wall having an inner surface defining a through bore extending between the first and second ends. Each mounting assembly has a wall with an inner surface defining a through bore in fluid communication with the housing through bore. A first coupling secures the first mounting assembly to the housing, and a second coupling secures the second mounting assembly to the housing.

Abstract: A check valve apparatus, usable in a double check valve backflow preventer apparatus, comprising a valve seat, a clapper pivotally coupled to the valve seat, a seal positioned to sealingly engage the clapper and valve seat when the clapper is closed against the seat, and a closure mechanism. The closure mechanism includes a first linkage element pivotally associated with the valve seat at a first pivot point located upstream from the seal, a second linkage element which is pivotally coupled to the first linkage element at a second pivot point, and which is pivotally associated with the clapper at a third pivot point, and a bias element associated with at least one of the linkage elements and configured to exert a closure force on the clapper.

Abstract: A device for controlling the output of rotary compressors which includes a housing (8) formed of two housing parts which define connection flanges (1, 3) at opposite ends thereof and which define a dividing plane (1, 3) therebetween that is slanted toward the plane of the connection flanges (1, 3) on both sides between a regulating flap valve (4), which controllably changes the passage cross-section of the suction duct, and a check valve (7) that is arranged behind the flap check valve in the direction of flow. The housing (8) may be assembled in different relative positions of the two housing parts (14, 15), which makes manufacturing simpler and more cost-effective and makes possible different relative positions of the two connection flanges (1, 3) to one another.

Abstract: A flush mounted valve assembly for releasably coupling a tubular member to the valve assembly by simple, one-handed operation. The tubular member, one end of which may be connected to a hose, is inserted into the coupler to open the valve. Helical grooves with a detent section on the tubular member engage matching nibs on the coupler, allowing the tubular member to be locked into place on insertion and rotation. Insertion of the tubular member opens a valve between the valve housing and the coupler member, permitting water from the pressurized water source to flow through the tubular member. O-rings are provided on the tubular member that engage the coupler prior to the opening of the valve, thereby preventing leakage around the tubular member. The valve housing and coupling are removably connected to each other, allowing easy access to the valve for periodic maintenance and alignment with the water source.

Abstract: An inflatable seating pad (10) consists of a hand operated pump (12) integrated within the top surface to inflate the pad with air. The pad (10) has a shut-off connector (6) at one corner which locates and is connected to a pressure relief valve (8). In use, the pad (10) is inflated by pushing upon the hand operated pump (12) to over inflate the pad. The shut-off connector (6) maintains the pressure in the pad (10). To set the pressure to a desired pressure the user actuates the pressure relief valve (pre-set to optimum pressure) to operate the shut-off connector (6) to allow air to exhaust through the pressure relief valve.

Abstract: An activating pin which comprises a valve part, the piston part comprises within it a channel, the cross-section of said channel is, at least one part of said piston part, consisting of sectors, wherein in each sector the distance between the center point of the channel cross-section and the outermost limiting surface of the channel is larger than the corresponding distance measured along the line separating the sector from an adjacent sector, and said valve part is positioned movably with respect to said piston part between a first valve position and a second valve position for enabling the conduction of gaseous and/or liquid media through said channel when said valve part is in said first valve position, and inhibiting the conduction of gaseous and/or liquid media through said channel when said valve part is in said second valve position.

Abstract: The present invention relates to an apparatus for the safe filling and emptying of a pressurized vessel charged with flammable and/or aggressive gas. The apparatus features an upper flap combination, an intermediate lock vessel having a flushing apparatus, and a lower flap combination. The present invention also relates to a pressurized reactor which is charged with flammable and/or aggressive gas and is equipped with a filling lock apparatus and an emptying lock apparatus for the simultaneous preparation of tetrachlorosilane, trichlorosilane and hydrogen. In addition, the present invention relates to a special process for filling and emptying such a reactor.