Abstract: A gate valve is provided having a housing with an interior channel, and a gate which slideably engages the channel. The valve includes a peripheral seal, positioned in the channel to prevent the flow of fluid around the edges of the gate. The valve also includes a transverse seal positioned in the housing to prevent the flow of fluid along the planar surfaces of the gate. The transverse seal includes a generally U-shaped casing disposed about a packing material. The packing material maintains pressure against the casing, thus forcing the casing against the gate. The surface of the casing which is adjacent the gate includes a plurality of raised ribs. The casing includes a bottom member, and two oppositely disposed legs. Each leg has a foot at its distal end, extending away from the packing. Scraping blades are positioned adjacent to each leg member and its corresponding foot. The scraping blades clean debris from the gate, and prevent "rolling" of the seal into the channel.

Abstract: Valves of the diverter and isolating types have their ports which are to be opened and closed surrounded by seats each of which is inclined inwardly towards the surrounded port. The hinged blades are surrounded by tips in support of seals of which there are two for each port to be closed. The seals are metallic and resiliently flexible and the seals of each pair are disposed to engage spaced apart, transverse zones of a seat when a blade is operatively positioned to close the surrounded port. As a diverter valve has two ports to be closed by opposite sides of its blade, there are two like but oppositely disposed pairs of seals, one pair for each port. With both types of valves, the seals of a blade are in substantially linear engagement with a seat when the blade is positioned to close the associated port and are in scraping engagement with the seat as the blade moves into and out of that position.

Abstract: The present invention includes an improved transverse seal in a gate valve having an assembly portion and a gate. The assembly portion comprises a body, a chest and a top structure or bonnet. The improved transverse seal is located within the chest of the assembly portion and is in constant contact with the gate on each side of the gate. This transverse seal comprises a pliable, longitudinally extending casing of generally U-shaped cross section having a bottom member in contact with the gate and two oppositely disposed leg members. The bottom member is provided with a plurality of raised ribs. A packing material rests within the cavity of the casing, to provide support and pressure on the transverse seal. The oppositely disposed leg members also include longitudinally extending flanges at their distal ends. A rigid scraping blade is placed adjacent to each leg member and rests on its corresponding flange such that one edge of the scraping blade continuously contacts the gate.

Abstract: A device for transport of material between chambers at different pressures, comprises a feed chamber, a main chamber having an upper housing with an inlet and a lower housing with an outlet. The feed chamber is coupled to the main chamber at the inlet, and a first slide valve opens and closes the inlet. A second slide valve for opening land closing the outlet may be provided. At least one hollow gasket with an essentially closed wall, preferably an inflatable gasket, is provided between the upper housing and the first slide valve for sealing the inlet; and, at least one gasket with an essentially closed wall, preferably an inflatable gasket, may be provided between the lower housing and the second slide valve for sealing the outlet. Alternatively, a first flap valve for opening and closing the inlet is provided which is pivotally coupled to the upper housing at one side.

Abstract: An improved airplane toilet drain valve assembly comprising a rotatable valve mounted within a housing and a moveable sealing member which is arranged in contact with the valve surface when the valve is in a closed position and which during operation of the valve is moved away from the valve surface thereby avoid wear or damage due to friction between the seal and rotating valve. The invention further comprises a scraper member mounted within the valve housing which prevents solid waste materials from coming into contact with the seals.

Abstract: The device comprises a housing with a circular passage orifice, a pivoting closing element in the form of a spherical dome and a circular gasket surrounding the said orifice and mounted on an annular support axially displacable towards the closing element under the action of a pneumatic fluid, the said annular support possessing for this purpose a passive annular surface exposed to the pressure in the said housing, the active surface of the support being larger than its passive surface.

Abstract: An automated cleaning device for beverage drafting/dispensing systems uses cleaning balls to clean tap lines. The cleaning balls are pushed through the lines by clean, pressurized water. The cleaning device includes a dual-acting hydraulic cylinder which is operated by means of an electric control system and solenoid valves. This dual-acting hydraulic cylinder is an integrated feature of a sliding valve system which retrieves the cleaning balls from a retention hopper through a cylindrical slide, inserting the cleaning balls alternately into either a tap line leading to a tapping cock or into a tap line leading to a keg, assisted by pressurized water. In the drafting/dispensing position, the sliding valve provides an uninterrupted connection between the two lines. The sliding valve can be operated from a remote switching location or manually.

Abstract: A pressure operated valve includes an inlet and an outlet connected by a main valve having a valve diaphragm member that communicates with an operating pressure chamber. A pilot valve inlet port and a pilot valve outlet port also communicate with the operating pressure chamber. The inlet port is configured in the form of four circular slits of 0.004 to 0.007 inches width. The slits are formed by four pins of a pilot valve insert which fit into four bores in a valve body. Each pin has a ridge on its surface parallel to the pin axis, which pin locates and spaces the pin in the bore to form the slit. The slits are located flush with wall of the main inlet so that water rushing through the inlet washes particles off the slit. The pilot valve outlet port is sealed by an armature comprising a ferromagnetic sleeve and a flexible rubber core. A groove in the core receives the end of a lever which seals the pilot valve inlet port whenever the pilot valve outlet port is open and vice versa.

Abstract: A valve comprises a first relatively fixed valve component assembly surrounding a second valve component assembly which is relatively movable within said first assembly. A seal is provided between the first and second valve component assemblies and a barrier assembly is provided for preventing particulate contaminant material reaching the seal. The barrier assembly comprises first and second barrier elements extending around said second valve component assembly. The first barrier element or elements are in engagement with the first valve component assembly and the second barrier element or elements are in engagement with the second valve component assembly. The barrier elements may be spring rings and form a labyrinth type seal between the two valve component assemblies.

Abstract: A two-way valve apparatus for a fluid distribution pipe adapted to be cleaned by scraping, comprising a ported tube containing a mobile abutment member for receiving a scraper, and a sleeve and a tubular confinement member fastened to and moving axially in unison with the abutment member to open and close the tube port.

Abstract: A fluid flow control valve has a diaphragm for sealing against a valve seat. The diaphragm includes a bleed hole for passing fluid from one side of the diaphragm to the other. A debris arrestor comprising a one-piece flexible tag is inserted into the bleed hole by deforming the tag to pass therethrough. The tag after insertion expands to retain itself in the bleed hole.

Abstract: A spray gun having a trigger lever operated supply valve which includes a reciprocating hollow valve sleeve and a free floating spherical valve element to close the hollow in the reciprocating valve sleeve when the valve sleeve is in its closed position. The free floating spherical valve element and the valve sleeve are located in a chamber which has at least two exit ports spaced from one another at a distance in excess of the diameter of the spherical valve element. End areas of the valve sleeve are equal and subject to the pressure of the material flowing through the valve in its open position to provide a balanced force on the valve sleeve when the valve is open and to help a bias spring to hold the valve in the closed position.

Abstract: A metering valve is provided having a piston assembly mounted for movement between open and close modes. The piston assembly is biased to assume a close mode. The piston assembly assumes an open mode only when a predetermined external force is applied to a valve actuating element forming a component of the metering valve. When the external force is removed, the piston assembly automatically returns to the close mode. The rate of movement of the piston assembly during a first segment of travel from the open mode to the close mode is substantially slower than the rate of movement during a second segment of the travel.

Abstract: A pilot operated, diaphragm actuated fluid valve assembly having an annular main valve seat with a tapered annular surface disposed therearound. A movable diaphragm has a generally flat central main valving surface thereon and an integrally formed annular wiper extending outwardly therefrom. The annular wiper contacts the tapered annular surface a relatively small distance before the main valving surface contacts the main valve seat.

Abstract: A metering valve is provided having a piston assembly mounted for movement between open and close modes. The piston assembly is biased to assume a close mode. The piston assembly assumes an open mode only when a predetermined external force is applied to a valve actuating element forming a component of the metering valve. When the external force is removed, the piston assembly automatically returns to the close mode. The rate of movement of the piston assembly during a first segment of travel from the open mode to the close mode is substantially slower than the rate of movement during a second segment of the travel.

Abstract: A sprinkler includes a pop-up stem that defines a passage extending to a downwardly facing opening that is circumscribed by a generally planar surface and covered by a valve element dimensioned and arranged in confronting relationship with the planar surface to at least partially block the opening. The valve element is mounted on the stem to enable movement in a plane generally parallel to the planar surface in order to vary an amount by which the valve element blocks the opening, and rotation of a shaft causes valve element movement to restrict the flow of liquid through the opening a selected amount. A resiliently deformable valve element may be loosely mounted to provide clearance sufficient to enable movement of particulate material from between the valve element and the planar surface while enabling the liquid to urge the valve element toward the planar surface.

Abstract: A valve assembly for use in a sprinkler head comprising a valve seat having a generally frusto-conical surface configuration and an annular rib, a flanged valve member in sealing engagement with said annular rib and having a depending, radially inwardly spaced surface which in cooperation with said annular rib and surface configuration forms a partially enclosed space in which a resilient O-ring is captively held in compressive engagement between the valve seat and valve member.

Abstract: A solenoid valve, especially an outlet valve for infusion water. A valve chamber (2) is accommodated in a valve housing (1) and communicates with a supply channel (Z) and with a drain channel (A) by way of a valve seat (3). The magnetic armature (6) of a magnetic system accommodated on valve housing (1) is connected to a valve plate (10) accommodated in the valve chamber (2) opposite the valve seat (3). The valve chamber (2) is sealed off from the interior (11) of the magnetic system by an isolating diaphragm (12). To prevent calcium deposits, the valve seat (3) has a sheet (13) of polytetrafluoroethylene accommodated coaxially along its inner circumference and projecting beyond the surface of the valve seat (3) on the side facing the valve plate (10). The upper edge of the sheet (13) facing the valve plate (10) is in sealing plane with respect to the valve plate.

Abstract: A self-correcting control system and method is provided for a furnace to correct certain operating conditions that exceed normal limits. Upon sensing insufficient air flow as a function of the pressure drop across the heat exchangers, the control system and method cause the inducer motor to increase in speed, thereby to increase the flow of combustion air. Similarly, upon sensing that the flow of air to be heated exceeds a predetermined temperature, the control system and method will increase the speed of the air blower to increase the flow rate of air to be heated through the furnace, thereby resulting in lowering the temperature of the air to be heated below the predetermined temperature. Upon sensing a gas flow leak through the gas regulator, the control system and method will recycle the gas regulator to properly seat a gas flow control valve therein. If none of the self-correcting features correct the particular occurring problem, the control system and method will shut down the furnace.

Abstract: Disclosed is a gate valve for controlling flow, providing a dual seal, including a valve body having a discharge orifice. A gate assembly, located upstream of the discharge orifice, is movable between open and closed positions remote from and blocking the discharge orifice, respectively. The gate assembly includes upper and lower spaced flexible sealing disks which are attached to a relatively rigid upstream backup plate. Radially inner and outer valve seats are secured to the valve body adjacent the discharge orifice. When blocking flow through the valve body, each gate is wedged in sealing engagement with a respective valve seat and a chamber is formed between the two seals to receive seepage past the upstream seal. The chamber may be either evacuated or pressurized to prevent flow of controlled material past the lower or downstream seal.

Abstract: A self-closing valve is provided at a zone of a circumferential wall section of its housing that bounds a relief chamber with a stripping and holding-back arrangement which includes a saw-tooth formation constituted by a plurality of teeth and is situated at an end portion of the wall section that is close to the inlet of the valve housing. The teeth of the formation have respective substantially radially extending flanks and steep inclined flanks which are operative for stripping off contaminant particles which are entrained for joint movement by a sealing lip of a piston seal that is mounted for joint movement on a valve piston received in the wall section from the sealing lip during the movement of the valve toward its closing position, and for holding such contaminant particles back during the movement of the valve piston towards its open position.

Abstract: The present invention relates to a slide damper system used for a vertical type of furnace for continuously heat-treating charged solid matters. This slide damper system comprises at least two slide damper means disposed vertically apart from each other in the furnace. The slide damper means is provided with means for preventing clogging with foreign matter and/or means for heat-resisting as well as means for preventing two or more slide damper means from opening simultaneously.

Abstract: The present invention relates to an exhaust gas brake system of slide type for an improvement in construction that a coupler cover member has a space chamber defined in the inner circumference of a central opening thereof through which a piston rod of a pneumatic actuator extends, the space chamber communicating to the atmosphere, through which chamber exhaust gas from an engine liable to flow to the side of the actuator is guided to be discharged to the atmosphere.

Abstract: A valve body 10 supports a rotary valve member 20 having a transfer port 22. Sealing between a port 17 of the valve and the member 20 is achieved by a sleeve 30 movable towards and away from the member 20. In a valve closed position seal means in a flat end of the sleeve engage a flat base of a recess in the member 20. The member 20 may be provided with a rotary scraper 41 and heaters located in channels 40 and in this construction the valve is suitable for transferring sodium-cooled nuclear fuel between various localities.

Abstract: A valve for use in distributing irrigation water in a surge irrigation system. The valve having a diverter member rotatably mounted within the cylindrical cavity of a valve body. The diverter member has an arcuate diverter plate mounted thereon which conforms to the curvature of the cylindrical cavity and wiper blades extending from said diverter plate into the space between said plate and the interior of the valve body. Upon circulatory or oscillatory rotation of the diverter member, the wiper blades sweep the interior of the valve body. The diverter plate may be selectively aligned with one of the outlet ports in the valve body, thereby diverting flow from the inlet port to the remaining outlet ports. The diverter member design minimizes engagement with particulate matter and it minimizes the force exerted upon this member by the irrigation water to decrease the torque and corresponding power consumption required to rotate the diverter member.

Abstract: An improvement in a pressure relief device of the type used in a power transformer, the improvement consisting of a flat circular gasket fixedly mounted about its inner periphery, and having its outer periphery flexibly arranged for wiping contact with the inner surface of a cup-like valve member.

Abstract: A valve for controlling the flow of particulate material through a conduit which may be referred to as a clam shell valve including and arcuate valve plate. The valve includes a seal block having a recess for receiving the leading edge of the valve plate to assure a seal between the conduit and the valve element. The seal block is shaped to inhibit the entrance of material into the seal block and allow for the easy discharge of that material on opening of the valve element. The valve also includes an upper wiper seal element for cleaning the surface of the valve.

Abstract: The disclosure is of a gate-like valve wherein a gate or carrier plate has upper and lower through bores movable into alignment with flow passages in the body. In the upper through bore is received a valve disc that is rotatable on the carrier between a closed position wherein it is in the plane of the gate to seal around the through bore and an open position wherein it is disposed along the axis of the through bore. A valve stem is coupled to the butterfly disc so that partial rotation of the stem operates the butterfly valve, and the stem is also engageable with the carrier plate so that when the stem is raised and lowered it raises and lowers the carrier plate to move the butterfly disc out of alignment with the flow passages.

Abstract: A guide slot for a valve plate is bounded on both sides by guide strips projecting into a flow channel of a valve housing for the plate. These guide strips contain notches at intervals. The notches of one guide strip are offset relative to the notches of the other guide strip. When the valve is open, medium entering the guide slot through the notches on the inflow side is deflected in the guide slot before it leaves the guide slot again through the offset notches on the outflow side. This generates in the guide slot a lengthwise current leading to a self-cleaning action for combatting deposits. During the valve plate closing process, a permanent self-cleaning takes place over the entire closing travel zone. For this reason, the valve is particularly well suited for use in conveyor lines for thickish, powdery, granular or solids-containing media.

Abstract: A rotary metering valve (10) includes a pair of windows (145, 200) in mutual registry with one another, the windows defining a flow passage through the valve. The geometries of windows are such that closing the valve sweeps contaminants trapped therein, inwardly, thereby enhancing the effectiveness of the output torque of the valve's actuator (75) in breaking apart the contaminants for subsequent removal by flow through the valve.

Abstract: A piston operated valve utilizes a piston which is driven by high pressure air to open or close the valve. The valve includes valve body portions (7, 8) which are formed of carbon fibre containing fluorocarbon resin, and which are detachably mounted on a valve rod (6). Where the valve is used in a duct system which passes a fluid such as a hot steam, the materials chosen provide a high degree of sealing performance, durability, heat and pressure resistance. The detachable mounting of the valve body facilitates the maintenance.

Abstract: A paint flow controller for insertion into a continuous flow pressure feed recirculating paint supply system where a portion of the recirculating paint is bled off through an externally adjustable, annular metering orifice for supply through a connector to a paint spray gun.

Abstract: The technical field of the invention is that of guillotine type valves for powdery, granular or pasty products.The technical problem posed consists in improving the valve disclosed in U.S. Pat. No. 4,356,838, so as to simplify the construction and maintenance thereof and to improve the operation thereof.According to the invention, the arms (7) of the plate (3) are removable, as well as the sleeve (23) force fitted into the external face of the orifice of the front and rear bodies of the valve. The internal face of each of the bodies (1, 2) is covered with a "duplex" seal (26) and the movable arms of the plate slide with respect to PTFE seals (16, 18). Finally, the abutment member (4) at the end of travel of the plate (3) is made retractable by means of a pneumatic or spring return device.

Abstract: A method and apparatus for cleaning debris from the interior surfaces of two flowlines, particularly dissimilar sized flowlines, utilizes a crossover flowline, crossover valve, and two bypass flowlines and bypass valves, wherein the bypass flowlines communicate between a respective flowline and the crossover flowline.

Abstract: A bidirectional rotary valve capable of use in high pressure flowpaths includes a pair of removable end retainers defining aligned ports and having a single rotatably mounted disc closely positioned therebetween. The disc has ports corresponding to those of the end retainers and is operated by link means coupled to an operating rod slidably mounted in the valve body. Rotation of the disc changes the alignment between its ports and those in the end retainers for controlling flow. The disc is loosely mounted on a bearing pin that is also loosely fitted in the end retainers to permit slight lateral movement of the disc and ready disassembly of the valve. The disc is constructed such that it will flex to a greater degree for a given pressure than the end retainers.

Abstract: The present invention provides a fluid handling device which operates as a combination check valve and fluid flow meter. The device includes a housing having an inlet and outlet and a fluid passageway formed therebetween. The housing forms a valve seat in series with the fluid passageway while a valve member movable between an open and closed position cooperates with the valve seat to open and close the fluid passageway. A tapered surface on the valve member forms a variable area opening at the valve seat which increases in area as the valve member moves from its closed and towards its open position while a compression spring urges the valve member towards its closed position. An indicator needle is mechanically connected to the valve member and reduces an exteriorly visible signal of the position of the valve member which, in turn, is representative of the fluid flow rate through the device.

Abstract: A slide valve comprises a valve housing which has a through passage therein with a curved bottom and a recess along the bottom in which is located a resilient seal member. The valve member includes a slide portion which is mounted for upward and downward reciprocal movement in the housing and a guideway formed on each side of the curved bottom. The housing also contains a flange member on each side of the slide plate which has at least one notched portion which defines a scraper edge. The valve plate has a lower stepped portion forming a bottom projecting surface, an upper surface spaced away from the bottom edge and an intermediate ledge surface between the bottom and upper surfaces. The upper surface is curved downwardly at each side toward the bottom surface to define a shearing edge on each side of the slide plate which is cooperable with the scraper edge to dislodge material out of the guideway and the space between the flanges and into the flow stream of the through passage of the valve.

Abstract: The slanted closing rim of a valve plate includes a cylindrical portion at the rear side, having a diameter D1 which corresponds to the width of the plate and slightly exceeds the diameter D3 of the passage throat. A groove in the casing guides the narrow sides of the valve plate and accomodates a seal strip. The grooves partly closed at the front side by a guide strip which in the bottom zone of the passage throat is a semicircularly extending strip. The inside diameter D4 of this cylindrical strip approximately corresponds to that of the valve plate and its axis a extends at a level which is higher by half the difference between diameters D1 and D3 than that of the axis b of the throat passage. A slanted closing rim of the valve plate is provided with shear arcs on its frontal points on each of the side edges. The two shear arcs form a kind of a plowshare deflecting the medium from the seal.

Abstract: Upon energization a solenoid (58) activates a pilot valve means (44,46) for opening a pilot flow passage (34) causing flow from a pilot portion (52) of the valving chamber. Flow from the main valving chamber (18) and through a bleeder passage (50) is insufficient to prevent a loss of pressure in the chamber (52) and the pressure in valving chamber (18) urges diaphragm pad (29) upward away from contact with valve seat (26) to permit flow from chamber (16) to outlet (20). A diaphragm insert (30) has a portion (32) with a lip (68) extending into a narrow section (66) of outlet (32) for providing a downstream restriction to maintain sufficient pilot circuit differential to provide valve movement until rim (68) moves out of passage (66) thus providing any desired stroke by adjusting the level of (66) to prevent trapping fine particles of foreign matter at the valve seat.

Abstract: A valve which controls either the injection of fluid from an exterior source into the interior of the valve housing or the exhausting of fluid pressure from the valve housing. The valve is especially adapted for controlling the injection of fluid into a wireline lubricator assembly. Alternative means are provided for opening and closing the valve. Preferably a metal-to-metal seal is used to control fluid flow.

Abstract: A three-way valve for controlling the flow of semi-liquid compositions having a cylindrical valve core journalled for rotation within a valve housing, cylindrical fluid passages formed within the valve core whereby each such fluid passage has a circular knife-edge type cutting plate disposed along its outer edge for cutting solids during activation of the valve. Exemplary apparatus according to the invention includes sealing means for the valve seats which are adjustable without disassembly of the valve, and means for providing a continuous water flush across the valve seats during normal operation.

Abstract: A slurry gate valve is disclosed for controlling the flow of slurry along a pipeline. The gate valve comprises a cylindrical conduit portion and a gate housing portion. The cylindrical conduit portion includes a first and second annular bolt flange defining first and second terminals disposed at opposite ends of the cylindrical conduit portion. A first and a second metallic sleeve liner, respectively, extend inwardly from the bolt flanges and define therebetween a gate receiving slot. The gate housing portion is secured to the cylindrical portion and houses a gate guide track which is in planar alignment with the gate receiving slot. A gate has a lower portion which cooperates with the gate receiving slot in substantially fluid tight relationship therewith. The gate travels from a closed position to an open position wherein the gate substantially fully withdrawn from the conduit portion. The gate valve further includes means for driving the gate between the open and the closed position.

Abstract: The invention provides an automatic exhaust brake valve unit having a hollow body with an exhaust gas passage extending therethrough and a valve closure member movable in the hollow body between a closed position in which it closes the passage, and an open position in which it leaves the passage clear, the hollow body having an open end face closed by a removable plate so that the valve closure member can be removed through that end face. Such a valve unit is usable to control exhaust gas flow in either direction through the exhaust gas passage when connected in an exhaust system of a motor vehicle.

Abstract: A rotary valve for controlling flow of pulverulent solids has diametrically opposed obturators carried on a rotary support and cooperating with respective valve ports in an internal circumferential surface of a cylindrical valve body, the obturators being movable radially and urged by springs against the internal surface of the valve body so as to make a good seal when the valve is closed, while permitting unobstructed flow of material when the valve is open.

Abstract: A flow control valve assembly for closing an inlet into a housing through which powdery or granular material is flowing and for sealing said inlet once closed, the assembly comprising a closure member movable within the housing from an inoperative position in which the inlet is open into a normal operative position closing said inlet, during which movement a deformable sealing ring mounted in the housing to surround the inlet wipes over, to clean, the closing surface of the closure member and to make initial sealing contact with the closure member. Inflation of the sealing ring against the closure member in its normal operative position then supplements the seal while, on subsequent pressurization of the interior of the housing, the closure member is displaced bodily within the housing axially towards the inlet to make increased contact with, to supplement further the seal with, the sealing ring.

Abstract: An improved self-cleaning filter assembly for use in a solenoid-actuated valve of the type having a fluid pressure-operated diaphragm to control opening and closing of the valve. Control fluid under pressure is admitted from an inlet chamber of the valve into a control chamber at one side of the diaphragm to maintain the valve in a closed position, and this fluid pressure in the control chamber is relieved by actuation of a solenoid to open the valve. The self-cleaning filter assembly comprises a relatively rigid filter element for filtering the control fluid and a plurality of scraper blades mounted for scraping dirt, grit, or the like from the filter element each time the valve is opened or closed.

Abstract: The technical field of the invention is that of valves of the guillotine type for powdered, granulated or pasty products.The object is to provide such valves which are self-cleaning and therefore avoid a wedging of the guillotine plate which opposes the sealing effect of the closure of the valve by the plate.The gist of the solution of this problem resides in the fact that there are interposed, between the slideways of the body of the valve and the slidable plate straight elongated section members which are rigid with the slidable plate and are distinctly longer than this plate. These section members fill the whole of the space of the slideways and prevent the product passing through the valve from penetrating and accumulating in the slideways.The main use of the invention resides in the equipment of installations conveying powdered, granulated or particulate products.

Abstract: A high lift check valve resistant to the flow of abrasive containing fluid therethrough, which valve may be transformed to also act as an excess fluid control valve.

Abstract: A gate valve apparatus suitable for controlling the flow of fluids in a conduit, especially gases in high temperature applications, is disclosed. The apparatus includes a gate member adapted for sliding movement through an aperture in the gate valve assembly. Each opposing side of the aperture has fixedly mounted cooperating flat sealing strips to seal the aperture in both the conduit-open and conduit-closed positions. In certain embodiments a plurality of substantially parallel gate members, each having aperture sealing means, may be used to provide increased sealing effectiveness for highly toxic gaseous mediums.

Abstract: Disclosed herein is a head for mixing and ejecting interacting liquid components, in particular for molding articles made of plastic material. The head comprises: a mixing chamber that communicates with a discharge duct, and a first and at least a second duct for infeeding the individual components, the orifices of which open into the mixing chamber; the latter being placed laterally with respect to the discharge duct and its axis forming an angle with the axis of the discharge duct.