Abstract: A connector is configured to connect a drug container with a solution container and permit contents of the drug container to be combined with the solution container. The connector has a connector body with a first coupling for fluid connection with the drug container. The first coupling defines a first fluid passage. The connector body also has a second coupling for fluid connection with the solution container. The second coupling defines a second fluid passage. A control valve has a movable valve body that defines a third fluid passage. The valve body is positionable relative to the connector body in a first position, in which the first fluid passage is sealed from the second fluid passage. The valve body is also positionable in a second position, in which the first fluid passage is connected in fluid communication with the second fluid passage by the third fluid passage.

Abstract: A ring-shaped gasket for making high-purity fluid pathway connections between opposing fluid delivery apparatus elements having at least one simple flat surface in contact with the gasket. The face of at least one apparatus element typically has a circular counterbore depression to receive the gasket, but is not required. The gasket has a body, pierced through by a hole creating a fluid pathway and defining a radial inner surface, and additionally having a radial outer surface, a first axial end surface and a second axial end surface. At least one of the first and second axial end surfaces has a stress concentration feature radially adjacent to a gasket sealing region, the sealing region constructed to be in contact with a face surface of a corresponding fluid conduit port. The stress concentration feature may be a groove or a plurality of cavities disposed adjacent the gasket axial end surface sealing region.

Abstract: Disclosed is a coolant control valve unit having a sealing structure, the control valve unit including: a rotary valve provided with a valve coolant passage formed from an inner surface to an outer surface of the rotary valve; a valve housing in which the rotary valve is rotatably provided; a fitting coupled to the valve housing, and having a fitting coolant passage; and a sealing unit provided between a front surface of the fitting and the outer surface of the rotary valve, wherein the sealing unit includes: a sealing ring being in contact with the outer surface of the rotary valve; and a rubber ring provided on the front surface of the fitting, and bringing the sealing ring into contact with the outer surface of the rotary valve, wherein the rubber ring has an X-shaped cross-section, with a front groove, a rear groove, an inner groove, and an outer groove.

Abstract: A valve assembly comprising a valve housing, and a valve body. The valve housing having a lower end and an upper end. A valve seat is positioned therebetween. The valve seat being inclined inwardly toward the lower end. The valve body is pivotably positionable within the valve housing, and pivoting between a first closed orientation and a second open orientation. The valve body is pivotable about an axis that extends through the valve housing positioned between the upper end and the valve seat. In the first closed orientation, the valve body is configured to translate toward and away from the lower end of the valve housing.

Abstract: A sealing device which is used as part of an injector in a reductant delivery unit (RDU), where the RDU is part of a selective catalytic reduction (SCR) system for injecting diesel exhaust fluid (DEF) into an exhaust system, used for controlling exhaust emissions. This invention improves the purging efficiency of the RDU, in addition to improving the sealing performance of the unit by reducing the fluid volume to be evacuated from the injector, and provides an additional sealing barrier to reduce the sealing load of the existing sealing elements. An additional sealing device having a ring seal and a stopper element (also referred to as a “plug”) is pressed into the upper valve body of the injector, which results in a reduced fluid volume that is left behind after a purging event, due to the reduced initial volume at the beginning of the purge.

Abstract: An assembly comprises a manifold and a valve. The manifold has a portion defining a bore having a first end and a second end. The valve is at least partially disposed within the manifold and includes a coil configured to generate a magnetic field; a bobbin configured to house the coil; a pole piece located near the bobbin; and a housing. The pole piece includes a first end configured for insertion into the bore of the manifold; a circumferentially extending groove located near the first end of the pole piece; an o-ring disposed in the circumferentially extending groove; and a radially outwardly extending flange located near the circumferentially extending groove that is configured to engage both the portion of the manifold defining the first end of the bore and the bobbin. The housing includes a tab configured to fasten the valve to the manifold.

Abstract: A faucet, which includes a seat defining a bore, and a one-piece construction metallic valve stem movable toward and away from the seat, the improvement comprising retainer structure associated with a lower end portion of the structure defining a head to locate in axial alignment with the bore, and a shank, and a non-metallic elastomeric O-ring installed on the shank, the O-ring sized to fit the bore between the head and stem structure above the shank, the O-ring received in the bore and captivated to directly seal off between the shank and the bore, seating with the bore, and a second O-ring carried by the stem and sealing off between the stem and a second bore defined by a bonnet as the first defined O-ring is moved by the stem toward and away from the first defined bore.

Abstract: A spool type control valve, comprising: a valve block having a cylinder bore with drilled holes on the cylinder bore internal wall; a valve spool inserted in the cylinder bore; wherein the valve spool having separation sleeves each being spaced apart on the valve spool; wherein an all-metal-seal ring is assembled and fitted on each of the separation sleeves; and wherein each of the all-metal-seal rings is constructed with three different functioning ring layers: a cylinder seal layer, an absorption layer, and a shaft seal layer; wherein the cylinder seal layer seals the cylinder bore internal wall and does come into contact with the valve spool surface; wherein the absorption layer absorbs any dimensional variations during dynamic movement of the valve spool; and shaft seal layer seals the valve spool and does not come into contact with the cylinder bore internal wall.

Abstract: A coupling member is disclosed which includes a valve device that is axially movable between an open position and a closed position where the valve device closes an annular valve opening defined an outer valve seat portion and an inner valve seat portion. The valve device includes an outer annular sealing member and an inner annular sealing member. The inner annular sealing member includes an annular extending portion configured such that, when the valve device approaches the closed position, the annular extending portion sealingly engages the inner valve seat portion and is elastically bent to allow the valve device advance further to the closed position so that the outer annular sealing member positively engages the outer valve seat portion.

Abstract: A gate valve of a semiconductor manufacturing apparatus, which is formed between a processing chamber in which processing is performed and a transfer chamber which carries a substrate on which the processing is performed, includes a gate valve at a side of the processing chamber; a sealing member which is formed in the gate valve at the side of the processing chamber; a gate valve at the side of the transfer chamber; a sealing member which is formed in the gate valve at the side of the transfer chamber; and a thermal insulator which is formed between the gate valve at the side of the processing chamber and the gate valve at the side of the transfer chamber.

Abstract: A valve system that includes (i) first and second longitudinally facing members defining a gap therebetween in fluid communication with transversely offset first and second orifices through the members, (ii) a primary biasing means longitudinally biasing the members away from one another, (iii) an elastic element positioned within the gap between the first and second orifices, and (iv) a repositioning means for longitudinally repositioning one of the members towards the other member against the bias of the primary biasing means for adjusting the longitudinal height of the gap. The members can be repositioned between (a) a first position wherein the elastic element does not seal the gap so as to allow fluid flow from the first orifice to the second orifice through the gap, and (b) a second position wherein the elastic element is compressed between the members and seals the gap so as to prevent fluid flow from the first orifice to the second orifice through the gap.

Abstract: The present invention relates to an air valve, including a valve body, an air valve adjusting pipe, an adjusting bolt, an airtight ring and a screw cap. With the geometric shapes of the air valve adjusting pipe and the adjusting bolt, the airtight ring installed onto the adjusting bolt is in contact with the internal wall of the air valve adjusting pipe to achieve a totally airtight effect and adjusting the level of airtightness.

Abstract: A rod activated water valve includes a valve base that mates with a standard water faucet. A valve housing attaches to the second end of the valve base, and has an inward protruding lip at a bottom end. The valve includes a water flow chamber with a solid cylindrical outer surface and a substantially flat foraminous surface at one end. An aperture is located central to the flat foraminous surface and a top edge of the water flow chamber has a lip for holding an upper plate o-ring. A rod having a rod head at one end passes through the aperture and is held in place by the rod head. A valve stem for selectively blocking the flow of water from the water faucet to the water flow chamber, activated by the rod head and providing a gradual stopping of the flow of water, thereby reducing water hammer.

Abstract: An adjustable water valve of time-controlled type consists of an inner shell and a time-controlled apparatus. The time-controlled apparatus is disposed inside the inner shell and includes an elastomer and a push rod. The elastomer is disposed between a support lid and the push rod. When the push rod is pushed into the inner shell, the water valve is opened, so the user can wash with the water ejected. After certain time, the water pressures are balanced and the elastomer which has been compressed will push the push rod back to its initial position to close the valve.

Abstract: An air intake valve apparatus for pneumatic tool, configured in an intake port of a pneumatic tool for controlling air circulations, mainly comprises a valve base configured in the intake port of the pneumatic tool, a stem configured through the valve base inside capable of shifting to a air-blocking position and a air-exhausting corresponding to the valve base and a flexible component propped the stem for keeping the stem on the air-blocking position regularly, wherein the stem has a first portion, a second portion and a mid-reducing portion, the mid-reducing portion is coupled to the first portion and the second portion respectively with different transiting surfaces so as to maintain the force driving the stem in constant no matter the air pressure entering the valve base is lower or higher.

Abstract: A two-part back cap for a plug valve includes a back cap seal body and a back cap retainer nut. The back cap retainer nut secures the back cap seal body within the plug valve and securely supports the back cap seal body. A gap between an outer periphery of the back cap retainer nut and the back cap seal body permits the back cap seal body to flex and expand with a plug valve body of the plug valve. This ensures that the back cap seals are not stressed and a longer service life results.

Abstract: A valve in which durability of a sealing member made from an elastic material can be increased and sealing capability can be advantageously maintained over a wide range from a large differential pressure to a low differential pressure. A valve (100), in which a valve disc (1) and a valve seat (2) are brought into close contact via a sealing member (5) composed of an elastic material and provided at the valve disc (1) or valve seat (2), comprises a throttle section (30) defined by the shape of at least one of the valve disc (1) and valve seat (2). The throttle section (30) narrows a flow passage formed between the valve disc (1) and valve seat (2) and is provided near the sealing member (5). The flow passage narrowed by the throttle section (30) is so set that narrowing preferentially proceeds in the flow passage in close proximity to the sealing member (5) during the closing operation of the valve disc (1).

Abstract: A two-part back cap for a plug valve includes a back cap seal body and a back cap retainer nut. The back cap retainer nut secures the back cap seal body within the plug valve and securely supports the back cap seal body. A gap between an outer periphery of the back cap retainer nut and the back cap seal body permits the back cap seal body to flex and expand with a plug valve body of the plug valve. This ensures that the back cap seals are not stressed and a longer service life results.

Abstract: A valve in which durability of a sealing member made from an elastic material can be increased and sealing capability can be advantageously maintained over a wide range from a large differential pressure to a low differential pressure. A valve (100), in which a valve disc (1) and a valve seat (2) are brought into close contact via a sealing member (5) composed of an elastic material and provided at the valve disc (1) or valve seat (2), comprises a throttle section (30) defined by the shape of at least one of the valve disc (1) and valve seat (2). The throttle section (30) narrows a flow passage formed between the valve disc (1) and valve seat (2) and is provided near the sealing member (5). The flow passage narrowed by the throttle section (30) is so set that narrowing preferentially proceeds in the flow passage in close proximity to the sealing member (5) during the closing operation of the valve disc (1).

Abstract: The electromagnetic valve comprises a cylindrical housing and a solenoid having an axial hole capable of receiving one of the ends of the housing that is associated with a split ring capable of being placed in a first circular recess on the periphery of the housing for extending partially and simultaneously in a second circular recess on the inner surface of the axial hole of the hole forming a port in such a manner as to establish a connection between the housing and the solenoid and the hole forming a port. An elastically compressible intermediate ring is placed around the housing and capable of being compressed between opposing support surfaces.

Abstract: A two-part back cap for a plug valve includes a back cap seal body and a back cap retainer nut. The back cap retainer nut secures the back cap seal body within the plug valve and securely supports the back cap seal body. A gap between an outer periphery of the back cap retainer nut and the back cap seal body permits the back cap seal body to flex and expand with a plug valve body of the plug valve. This ensures that the back cap seals are not stressed and a longer service life results.

Abstract: A two-part back cap for a plug valve includes a back cap seal body and a back cap retainer nut. The back cap retainer nut secures the back cap seal body within the plug valve and securely supports the back cap seal body. A gap between an outer periphery of the back cap retainer nut and the back cap seal body permits the back cap seal body to flex and expand with a plug valve body of the plug valve. This ensures that the back cap seals are not stressed and a longer service life results.

Abstract: Method and apparatus 10 for releasing pressure that may have built up behind a plug 18 in a controlled manner. Environmental and safety regulations mandate that all bleeder valves in a gas and liquid hydrocarbon and chemical service require metal plugs 18 to be installed downstream of the valve to ensure a positive shut off. Removal of these plugs 18 can create a hazardous condition if there is not a good seat on the bleeder valve. Pressure can build up behind the plug 18 and as the bull plug is removed, an uncontrolled pressure release can occur. The apparatus 10 is a safety device, serving as a plug 18 and also providing a method for releasing the pressure that may have built up behind the plug in a controlled manner. The device 10 comprises a carbon steel plug 18 fabricated with a vent hole 20 for controlled pressure release and a carbon steel modified hex bolt 22 having a tapered seat 26.

Abstract: The present invention provides a flowswitch for installing in piping, featuring a flowswitch base having an inner cavity; a pivot rod being arranged for rotating in the flowswitch base, the pivot rod having a pair of O-ring grooves; a paddle arm being coupled to the pivot rod inside the cavity, for moving in response to fluid flowing in the piping and rotating the pivot arm; lubricating O-rings being installed onto the pivot rod with each O-ring arranged in a respective O-ring groove for providing a respective seal between fluid being sensed and the outside environment and acting as a bearing on which the pivot rod rotates when the paddle arm moves, the grooves acting to holding the O-rings in place on the pivot arm in response to pressurized fluid flowing in the piping; and an actuating arm being coupled between the pivot arm and the pivot rod for actuating a switch when the pivot arm rotates.

Abstract: A valve for communicating a source 14 of compressed fluid with an opening 13 of an adjacent chamber 12 in a sleeve 11 comprises a circumferentially separated array of depressions 15 in the outer periphery of a bolt 10. Areas 19 and 20 of the bolt periphery between the depressions 15 serve to support the radially inner side of an O-ring seal 16 when the latter is aligned with the depressions.

Abstract: A sliding seal arrangement in particular for a valve having an anodised aluminium coating in contact with the seal. The coating is produced so that inclusions in the surface of the coating are substantially aligned. The direction of motion of the sliding seal in use is then substantially aligned with the direction of the inclusions resulting in greatly reduced wear on the seal.

Abstract: A valve accommodating hole (11), and each of a supply port (20), discharge ports (21 and 22), and output ports (23 and 24) connected to the valve accommodating hole are formed in a valve casing (15), and a valve shaft (12) is attached to the valve accommodating hole (11) so as to be reciprocable in the axial direction. Circular rubber elastic valve elements (51 and 52) are attached to the valve shaft (12) and used for switching between a communication state where either one of the elastic valve elements is spaced away from an inner peripheral sealing surface of the valve accommodating hole (11) such that the supply port (20) and the respective output port (23 or 24) communicate with each other and a shut-off state where either one of the elastic valve elements comes in contact with the inner peripheral sealing surface such that the communication is shut off.

Abstract: A combined valve-regulator apparatus, for safely regulating the flow of combustible gases such as oxygen. A compressible o-ring is used to provide controllable sealed seating of the valve and regulator during operation. A system is provided in the valve-regulator apparatus for venting the o-ring seat elements, to minimize undesirable ballooning or extrusion otherwise resulting from dynamic pressures and changing forces due to rapid gas flows through the regulator.

Abstract: A body element for a spool valve is provided that includes a body having an inner surface that defines an internal valving chamber having a longitudinal axis, and at least one transverse surface to the longitudinal axis. The transverse surface has at least one port comprising an annular flow passage, an intermediate flow passage and an outer flow passage extending outward from and in fluid communication with the inner surface of the internal valving chamber.

Abstract: The additional control valve device has a valve element which is guided between a gantry magnet and a trapping magnet in a reversibly movable manner in the direction of the longitudinal axis. An encircling seal is arranged on that side of the housing, in which the gantry magnet is arranged, which faces the valve element.

Abstract: A valve designed to limit inadvertent operation of the valve. The valve has a shortened plunger, a collar to prevent tilt of the plunger, and a conformable ring on the valve face. The plunger is provided with a groove sized and dimensioned to partially receive the inner surface of the ring.

Abstract: A device for securing a sealing member in a predetermined position. The device comprises a positioning element of a predetermined size and shape having a first surface and a second surface, and a retaining element of a predetermined size and shape disposed on at least one of the first surface and second surface of the positioning element.

Abstract: A body element for a spool valve is provided that includes a body having an inner surface that defines an internal valving chamber having a longitudinal axis, and at least one transverse surface to the longitudinal axis. The transverse surface has at least one port comprising an annular flow passage, an intermediate flow passage and an outer flow passage extending outward from and in fluid communication with the inner surface of the internal valving chamber.

Abstract: A non-return valve having a circumferential face and a channel with a mouth at one end of the channel and located in a groove having circumferential edges which are adjustable and fixable relative to each other and a valve comprising a O-ring manufactured of an elastic material for releasing the mouth at a predetermined pressure in the channel.

Abstract: A main valve body has a first passage, a second passage, and an opening which intersects the first passage and the second passage. A main plug body is rotatably inserted into the opening, and has an upper section into which a handle is inserted, and a lower section having a through-hole. An O-ring is seated on an annular groove which is provided in the vicinity of the through-hole. A seal-retaining member for preventing the O-ring from projecting is fitted to an expanded diameter section of the first passage. One end of the seal-retaining member tightly contacts an end surface of the expanded diameter section. A curved surface corresponding to an inner circumferential surface of the opening is formed at the other end of the seal-retaining member.

Abstract: A female or male coupler of a pipe coupling comprises a valve which is located in a fluid passage and is axially movable therein. The valve has a valve head which is provided with a sealing ring to be engaged with and disengaged from a valve seat formed on a wall surface defining the fluid passage of the coupler. The sealing ring is installed in an annular groove formed in the valve head. The bottom, or vicinity thereof, of the annular groove, which is isolated from the outside or the fluid passage by the sealing ring, is fluidly communicated with the exterior surface of the valve via a communication passage formed in the valve. As a result, even if a sudden large decrease in pressure is generated in the fluid passage, a pressure in the bottom, or the vicinity thereof, of the annular groove equalizes with the pressure in the fluid passage.

Abstract: A valve is generally elongated in shape and is inserted through an O-ring and amounting hole formed through a plate-shaped member. The valve includes a thread formed on an outer circumferential face of the valve so that a generally annular fitting is engaged therewith, an outer protruding wall protruding from the outer circumferential face of the valve to hold a circumferential edge of the mounting hole in cooperation with the fitting, a tapered portion formed in the outer protruding wall so as to be tapered toward the fitting and so as to abut against a part of the circumferential edge of the mounting hole, and a sealing portion disposed at a side farther away from the plate-shaped member than a portion of the protruding wall abutting against said circumferential edge part of the mounting hole so that each of the plate-shaped member and the sealing portion presses the O-ring against the other.

Abstract: A female or male coupler of a pipe coupling comprises a valve which is located in a fluid passage and is axially movable therein. The valve has a valve head which is provided with a sealing ring to be engaged with and disengaged from a valve seat formed on a wall surface defining the fluid passage of the coupler. The sealing ring is installed in an annular groove formed in the valve head. The bottom, or vicinity thereof, of the annular groove, which is isolated from the outside or the fluid passage by the sealing ring, is fluidly communicated with the exterior surface of the valve via a communication passage formed in the valve. As a result, even if a sudden large decrease in pressure is generated in the fluid passage, a pressure in the bottom, or the vicinity thereof, of the annular groove equalizes with the pressure in the fluid passage.

Abstract: A control valve includes a valve body and a valve seat mounted within the valve body. A valve element is mounted in the valve body and bears in a closed position on the valve seat to block a fluid passage formed in the valve body. An actuating rod is configured for axial movement and acts upon the valve element to move the valve element into an open position. At least one of the actuating rod and the valve element has an annular piston surface and is in communication with a fluid passage through an equalizing line.

Abstract: In a control arrangement for a working cylinder (1), which may be actuated by a pressure medium, there are provided two separate adjustable regulating valves (4, 5) for both sides of the cylinders, each connected with a pressure medium outlet (t) on one side and with the working cylinder (1) on the other side. The adjustment elements (4′, 5′) of the two regulating valves (4, 5) are housed in a common valve housing (31) for simplification of production, connection, assembly and maintenance; whereby the valve housing is provided with pressure medium connections for both cylinder sides that are to be controlled and with the corresponding conduits.

Abstract: A vacuum pressure control apparatus includes a vacuum proportional opening and closing valve 18 which is disposed on a pipe connecting a vacuum chamber 11 and a vacuum pump 19 and changes its opening to control the vacuum pressure in the vacuum chamber 11, and a pressure sensor 17 which measures the current vacuum pressure in the chamber 11. The vacuum proportional opening and closing valve 18 has a valve seat 36 and a valve member 33 provided with an O-ring 35 which is made contact with or separate from the valve seat 36. The vacuum pressure control apparatus configured as above controls the pressure in the chamber 11 by changing an elastic deformation amount of the O-ring 35 which is in contact with the valve seat 36 and thereby changing the flow quantity of gas leaking between the valve seat 36 and the O-ring 35.

Abstract: A snap pilot used to pneumatically energize and de-energize a control device, such as a valve. The pilot has two valves—one to admit pilot pressure, and one to exhaust pressure. The pilot incorporates valves having an elastomeric seal but maintaining the precision of metal to metal contact. In the preferred embodiment, the elastomeric seal is an O-ring placed in a groove, without adhesive, having only a small amount of deflection when the seat is closed, whereby simultaneous metal-to-metal and elastomer-to-metal contact is achieved.

Abstract: A mass flow controller (MFC) for controlling the fluid flow in a conduit is configured to include a flow command input for issuing a flow control command, a control unit accepting the flow control command for generating a control signal, a flow-sensing device including a plurality of temperature sensors, a sensor circuit and an amplifier, an actuator being driven by the control unit, and a valve member including a valve being adjusted by the actuator for controlling the fluid flow in the conduit, a distortion controller being distorted in response to the control signal, and an elastic body being distorted in response to an external force resulting from the distortion of the distortion controller for changing the orifice size in the conduit. In addition, the valve can be designed to be fixed instead of being mobile so as to reduce the occurrence of particles resulting from the mutual frictions emerging among the moving parts employed in the valve member.

Abstract: Various types of valves are disclosed, as well as the use of the same in a reaction control system for space travel vehicle applications. Multiple functions are provided by one of these valve designs by providing multiple flowpaths through the valve. An inflow and outflow tube of this multifunctional valve are fluidly interconnected with first and second chambers, respectively, within the valve. These first and second chambers are isolated from each other by a barrier assembly which may be “removed” at the desired type by a barrier rupture assembly to provide one of the noted multiple flowpaths (i.e., the inflow tube, the first chamber, the second chamber, and the outflow tube). A separate service port is fluidly interconnected with each of the first and second chambers, and a separate service valve may be disposed in each of these service ports to provide additional flowpaths for the multifunctional valve.

Abstract: A double-seat valve more particularly usable for the control of fluids to be kept separate in the chemical and foods sector is described, which has a valve housing (2) forming a first and a second housing spaces. There are two series-positioned valve bodies (10, 11) movable relative to one another and axially with respect to the valve housing, which define between them a leakage cavity (12) open to the environment of the valve. Each of the valve bodies has at least one sealing groove (15, 16) open to a housing-fixed valve seat or face (5) and in which is placed a seal (13, 14). According to the invention, the sealing grooves (15, 16) are connected in fluid-conducting manner through the associated valve bodies (10, 11) to the leakage cavity (12). The valve satisfies the highest possible hygienic demands, has little or no tendency towards contaminant deposition in the sealing area and can be rapidly and effectively cleaned.

Abstract: A pressurized gas flow controlling microvalve having a casing and cap which together define a valve chamber having gas flow inlet and outlet ports and a plunger positioned within the valve chamber moveable from a closed position sealing the outlet port to an open position permitting gas to flow through the valve, the plunger having mounted thereon an O-ring which provides the seal for the outlet port.

Abstract: A hydrant valve assembly including a spool member having at least one spool seal which is at times under extremely high pressure tending to cause the seal to be displaced from an associated recess, the spool member forming venting passages in the seal recess to alleviate seal pressure, the invention also including a new wet pipe design and a new collar design.

Abstract: A thermal expansion valve has a valve housing, a valve, a valve controller, a rod, and a seal ring. The valve housing has a first refrigerant passage, which is adapted to pass a liquid-phase refrigerant, and a second refrigerant passage, which is adapted to communicate a gas-phase refrigerant. The valve housing has a wall that separates the first and second passages. This wall has an opening that is in fluid communication with the first and second passages. The valve controls flow of the liquid-phase refrigerant entering the first passage. The valve controller is mounted on the valve housing and has a diaphragm and first and second chambers separated by the diaphragm. The rod extends between the diaphragm and the valve and is movably displaceable through the opening in the wall to open and close the valve to control the amount of the liquid-phase refrigerant entering the first passage. The seal ring is positioned in the opening and engages the opening surface of the wall and the rod to seal the opening.

Abstract: A overfill protection device includes a first tubular member, a cylindrical piston slidably fitted within the first tubular member, a spring arranged within the first tubular member and fitted over an intermediate portion of the piston, a first and second O-rings fitted in the first and second neck portions of the piston respectively, a second tubular member having an upper portion having a cylindrical recess open at a top and engaged with the first tubular member, a plug arranged within the second tubular member and located under the piston, a float rod having a cam plate at an upper end thereof, and a float fixedly connected with a lower end of the float rod, whereby no gas will be allowed to flow through the overfill protection device when the pressure within the gas tank exceeds a predetermined level.

Abstract: This invention relates to an improved valve which achieves high reliability through a simplicity of design, a minimum number of parts, a unique valve seat with a two stage sealing action, and at the same time provides a large flow when in the open position, owing to a large cross section opening. The valve features an improved sealing efficiency, in that when in the closed position an increase in pressure on the valve improves the performance of the valve, rather than increasing the likelihood of a leak. The valve is designed to be used in applications which permit the flow of material beyond the valve mechanism to discharge freely, whereby the discharged material activates a float mechanism so as to permit the valve to close when the discharged material reaches a preset level.