Abstract: A break check valve includes a valve body defining a mating surface and a valve inner cavity; a pivot pin positioned inside the valve inner cavity and secured to the valve body, an axis of the pivot pin offset in a radial direction with respect to a longitudinal axis of the valve body; and a valve member positioned within the valve inner cavity and configured to rotate about the pivot pin from an open position to a closed position of the valve, the valve member comprising a plate and an arm extending from the plate, the valve member configured to remain in the open position of the valve as long as a mating surface of a hydrant remains in contact with the mating surface of the valve body and configured to close when the mating surface of the hydrant is separated from the mating surface of the valve body.

Abstract: In a double eccentric valve, a valve seat or valve body includes a rubber seal part in which a seat surface or seal surface is formed. An interference between the valve seat and the valve body is made minimum at a position of a rotary-shaft-directional end of the valve body in the radial direction of the valve body which is parallel to an extending direction of the axis of a rotary shaft.

Abstract: A flap device for a motor vehicle comprises a flap housing that can be flowed through by a gas flow; and a flap shaft that is rotatably supported about an axis of rotation in the flap housing by means of at least a first and a second bearing element, which are held at the flap housing, and that carries a flap for selectively blocking or throttling the gas flow. The flap shaft is supported at the first bearing element in a first axial direction via a fixed abutment element that is axially fixedly arranged with respect to the flap shaft.

Abstract: A rotary turbine bypass valve comprises a valve chamber positioned at a junction of an inlet port, an outlet port and a bypass port, the inlet port configured for fluid communication with a flow of exhaust gas from an engine, the outlet port configured for fluid communication with an inlet of a turbine, and the bypass port configured for fluid communication with an exhaust aftertreatment device; and a valve rotor supported for rotation, about a valve axis, within the valve chamber. The valve rotor is rotatable about the valve axis between a first position in which the valve rotor permits gas flow through the bypass port and a second position in which the valve rotor blocks gas flow through the bypass port.

Abstract: A valve assembly for an active clearance control (ACC) system in a gas turbine engine. The assembly comprises a first valve disc positioned within a first outlet duct, a second valve disc positioned within the second outlet duct, and a shaft coupled to the first and second valve discs such that rotation of the shaft rotates both the first and second valve discs within the first and second outlet ducts, respectively. A flow control member in the second outlet duct surrounds the second valve disc, and is configured to restrict fluid flow passing through the second outlet duct to a greater extent than the fluid flow passing through the first outlet duct for a given degree of rotation of the first and second valve discs. A corresponding ACC system, gas turbine and method is also provided.

Abstract: An air vent for a vehicle may include: a duct part having an internal path through which air is moved; a first adjusting part rotatably installed in the duct part, and guiding the direction of discharged air while rotated in a side-to-side direction; a second adjusting part rotatably installed in the duct part with the first adjusting part, and adjusting a flow rate and direction of discharged air while rotated in an upward/downward direction or blocking an air flow passing through the duct part; a driving part connected to the second adjusting part and configured to supply power to rotate the second adjusting part; and a rotation pressing part connected to the second adjusting part and elastically supporting the second adjusting part to rotate the second adjusting part in one direction.

Abstract: A throttle valve device includes a body, a shaft, a pair of bearings, a valve, a motor, a valve gear, a coil spring, a first guide, and a second guide. At least one of the first guide and the second guide includes a circular holder that faces an end surface of the coil spring, a spring-end holding portion that outwardly protrudes from the circular holder and is configured to hold a spring end of the coil spring, a hub that is rotatably connected to the shaft, and a connecting portion that connects the hub and the circular holder. The first guide is in contact with a lever only at an end surface of the hub. The second guide is in contact with one of the pair of bearings, which is located close to the valve gear, at an end surface of the hub.

Abstract: A sealing valve arrangement for a shaft furnace charging installation including a shutter that cooperates with a valve seat and a shutter-actuating device for moving the shutter between a closed position in sealing contact with the valve seat and an open position remote from the valve seat, where the shutter-actuating device includes a tilting shaft connected to the shutter, an electric motor with an output shaft connected to the tilting shaft, and a braking device associated with the electric motor, where the braking device is configured for, when engaged, preventing the output shaft of the electric motor from rotating, the shutter-actuating device further including a transmission means arranged between the output shaft of the electric motor and the tilting shaft, wherein the transmission means is configured for transmitting rotational movement of the output shaft of the electric motor to the tilting shaft, where the transmission means includes a backlash configured for having a predetermined amount of allow

Abstract: An automotive air control valve comprises a housing, the housing defining an air flow path, a blade pivotally mounted within the housing, the blade pivotable between a closed position, wherein the blade substantially blocks air flow through the housing, and an open position, wherein air can flow through the housing, an actuator adapted to selectively pivot the blade between the open and closed positions, a first stop that provides a positive stop for the blade when rotated to the open position, a second stop that provides a positive stop for the blade when rotated to the closed position; and an over-center cam mechanism, wherein the over-center cam mechanism is adapted to bias the blade in the open position when the blade has been pivoted to the open position, and to bias the blade in the closed position when the blade has been pivoted to the closed position.

Abstract: A valve comprises a flap, a tubular valve body defining an exhaust gas flow passage, and a device to guide the flap relative to the valve body to allow the flap to pivot relative to the valve body around a pivot axis between a closing position and a freed position of the exhaust gas flow passage. The flap has two large faces substantially parallel to one another and connected to one another by an edge of the flap. The guide device comprises a pin, a distal, end and a base. The valve also comprises a stabilizing member secured to the flap.

Abstract: A valve includes a valve body having an exhaust gas inlet and an exhaust gas outlet, the valve body defining an exhaust gas circulation passage between the exhaust gas inlet and the exhaust gas outlet. A flap is arranged in the valve body and a shaft drives the flap in rotation with respect to the valve body. At least one guide bearing guides the drive shaft of the flap for rotation relative to the valve body. The guide bearing is engaged through an orifice of the valve body, with an inner end of the guide bearing being located inside the valve body. A first tube is engaged in one of the exhaust gas inlet and exhaust gas outlet and abuts against the inner end of the guide bearing.

Abstract: This invention relates to a novel crossover valve combined double offset and triple offset butterfly valves with metal seal ball valve, the valve has a novel stem seals and seat seals with various material combinations, metallic and nonmetallic, full metals with novel lock methods, safe and secured handle operator assembly particularly to rotary valves or all valve stem seals with those novel features used for on-off and flow fluid controlling in pipelines, offshore platform, marine/submarine, refiners, chemical plant, power plant and oilfields. Those valves can performance under multiple extreme conditions or in severe services; such as the rocket engine/turbine fuel control system with highly oxidative fluid under extreme temperature of 1600 F, or with liquidized oxygen or hydrogen down to ?425° F., the valve stem seals is used in chlorine gas process with extremely low emission leakage under 10 ppmv.

Abstract: A flap device for an internal combustion engine which includes a flow housing with a housing wall which delimits a flow-through duct. The flap device includes a shaft mounted in the flow housing, a flap body rotatably mounted on the shaft, an actuator for the shaft, and a pressure measurement point. The pressure measurement point is arranged in a duct section of the flow housing so that the flap body traverses the pressure measurement point when rotating, and in a region of the flow housing remote from the shaft when viewed in a circumferential direction of the housing wall. A flap surface of the flap body is directed towards the pressure measurement point and is curved so that, in each rotary position, a tangent arranged at the position of the curved flap surface having a shortest distance to an opposite wall surface of the flow housing is parallel thereto.

Abstract: A valve comprises a body having a gas inlet and outlet, a flap in the body,—a drive shaft which is rigidly connected to the flap, an actuator having a motor shaft, and a coupling of the motor shaft and the drive shaft. A mounting for the actuator on the body comprises a side wall defining a cavity and closed in part at angular sectors facing towards the inlet and towards the outlet. The wall has openings for circulating air between the inside and the outside of the cavity. A thermally insulating partition is between the body and the actuator and has a surface area which is greater than 50% of a cross section of the wall taken in a plane which is perpendicular to the axis of the shaft, and has an opening for receiving the shaft with a gap. A plate is connected to the shaft, which is axially interposed between the partition and the actuator, and covers the gap.

Abstract: An exhaust-flow-rate control valve for controlling a flow rate of exhaust gas flowing through an exhaust flow passage includes: a valve rod; a valve body having a flat plate shape and configured to rotate about the valve rod; and a valve housing having a cylindrical shape and defining a part of the exhaust flow passage inside the valve housing.

Abstract: The invention relates to a bearing system 1 of a flap valve 6 consisting of a valve shaft 1.1 with a valve shaft pivot 1.2, and consisting of a separate bearing body 2 which is fastened on the end side to the valve shaft 1.1, and of a valve housing wall 3 which has a shaft bearing 3.1 in the form of a depression, the bearing body 2 being guided rotatably in the depression 3.1. Here, the bearing body 2 has a recess 2.1, into which a separate bearing piece 4 is inserted, the valve shaft 1.1 bearing indirectly via the bearing body 2 and the bearing piece 4 against the housing-side shaft bearing 3.1, the bearing body 2 and the bearing piece 4 being formed from different metals or different materials.

Abstract: A turbine supercharger includes: a turbine; a turbine housing which houses the turbine; and a turbine bypass valve for controlling a flow rate of exhaust gas to be supplied to the turbine. The turbine housing includes, inside the turbine housing: a scroll flow passage for guiding the exhaust gas to the turbine; an outlet flow passage for discharging the exhaust gas supplied to the turbine to outside of the turbine housing; and a bypass flow passage bypassing the turbine and connecting the scroll flow passage and the outlet flow passage. The turbine bypass valve includes: a valve rod; a valve body having a flat plate shape and being configured to revolve about the valve rod; and a valve housing having a cylindrical shape and defining a part of the bypass flow passage inside the valve housing. The valve housing is fixed to an inner peripheral wall surface of the bypass flow passage, inside the turbine housing.

Abstract: An air flap device comprises a housing with an air flow passage section. At least one air flap is mounted on a first and on a second mounting point on the housing. The second mounting point is located at an axial distance from the first mounting point. The air flap is rotatable around the pivot axis defining the axial direction. By pivoting the at least one air flap relative to the housing, the effective flow cross-section of the air flow passage section can be modified. The air flap(s) is mounted on the mounting points with an axial play relative to the housing. At least one spring assembly is arranged such that at least one part of an axial movement of the air flap(s) occurs within its play relative to the housing in the direction of the first or/and the second mounting point, against a pre-tensioning effect of the spring assembly.

Abstract: An assembly for modifying airflow into a nasopharyngeal airway of a patient. A valve assembly is adapted to attach to an airflow generator. A solenoid including a piston is mounted exterior to a feed tube. A butterfly valve is within the feed tube at the inlet. A pin is within the piston, and a shaft of the butterfly valve is bent to connect to the pin such that the solenoid can drive the butterfly valve. An exhalation valve is within the feed tube at the outlet, the exhalation valve adapted to slide axially within the feed tube and incrementally cover the outlet. Upon rotation of the butterfly valve, the exhalation valve thereby slides towards the mask side, wherein upon activation of both the airflow generator and a controller circuit, pressurized air from the airflow generator continuously enters the feed tube but is converted to a single, repeatable burst or rush.

Abstract: A damper comprising a tubular duct, a circular blade disposed within the tubular duct and a shaft disposed within the tubular duct, wherein the shaft extends through a hole in the circular blade.

Abstract: An adapter assembly connected to a throttle body housing of an electronic throttle control assembly with a connecting feature. The adapter assembly of the present invention provides significantly lower cost assembly, and permits single side molding of the adapter assembly. The adapter assembly also includes alternative features for a captured seal or a void to contain excess thread sealer, and also permits a an anti-rotation feature, or locking tab, that is indexed to the receiving element, where the screw stop angle of the adapter assembly does not have to be controlled to provide a desired tab orientation.

Abstract: The manufacturing method notably includes a step (110) for sintering steel powder (10), the chemical composition of which includes, in mass percent, 2.3% of carbon, 4.2% of chromium, 7% of molybdenum, 6.5% of tungsten, 10.5% of cobalt and 6.5% of vanadium, so as to obtain a sintered steel (12) and shaping of the sintered steel (12), for forming a bearing ring (18).

Abstract: Provided is a gas-air mixing device for a combustor which effectively controls the amount of gas and air supplied to a burner provided in a combustor, such as a boiler or a water heater, thus improving the turn-down ratio which leads to increased convenience for using hot water and heat and enhanced durability of the burner. The gas-air mixing device for a combustor comprises: a housing, connected on one side to a turbo fan; a discharge part disposed on one side of the housing and in contact with the turbo fan; first and second air supply parts, provided on the other side of the discharge part and separated by a first partition; first and second gas supply parts, separated by a second partition; and an opening/closing means for controlling the flow of gas and air by opening or blocking the second air supply part and the second gas supply part.

Abstract: A valve body unit (11) in which a plurality of valve bodies (17) which open and close intake passages (10) are attached on a rotational shaft (16) is inserted into inner sides of housing passages (28) of a housing (12) and, thereafter, a holder (13) is mounted in the housing (12) to rotatably support the valve body unit (11). A flange (14) is fixed onto an upper surface of the housing (12) on the holder (13) by means of a vibration welding and the holder (13) is retained with this flange (14) and the housing (12).

Abstract: The present invention relates to a throttle valve adapted to equip an air intake system in an internal combustion engine, in particular an explosion engine. The throttle valve comprises: a body delimiting an air intake pipe; a valve member mounted rotatably in the pipe about an axis of rotation and comprising a spherical portion shutting off the pipe in the closed configuration; means for moving the valve member in rotation about the axis of rotation between different configurations of the throttle valve; and a bearing ring which receives a spherical outer surface of the valve member in sliding bearing contact. The throttle valve is characterized in that it also comprises a seal which is elastically deformable, which is arranged between the body and the bearing ring and which is adapted to take up forces to which the valve member and the bearing ring are subjected during a back-fire through the pipe.

Abstract: Example methods and apparatus independently control the seating force in a rotary valve. An example apparatus includes a rotary valve having a flow control member and a dual-acting actuator operatively coupled to the rotary valve. The actuator has first and second ports to receive a pressurized control fluid to change a position of the actuator. The example apparatus further includes a valve controller operatively coupled to the actuator to control the pressurized control fluid in response to a position of the rotary valve. The example apparatus further includes a pressure limiter operatively coupled to the valve controller and fluidly coupled to the first port of the actuator. The pressure limiter is to reduce a pressure of the pressurized fluid provided to the first port of the actuator to reduce a seating force of the flow control member when the rotary valve is in a closed position.

Abstract: According to one embodiment, a flood vent includes a frame forming a fluid passageway through an opening in a structure. The flood vent further includes a door pivotally mounted to the frame in the fluid passageway for allowing a fluid to flow through the fluid passageway. The door has two opposing faces that include a first face and a second face. The flood vent further includes a first float positioned within the door in a location in-between the first face and a second float. Additionally, the first float is configured to allow the door to pivot in a first direction. The flood vent further includes the second float positioned within the door in a location in-between the second face and the first float. Furthermore, the second float is configured to allow the door to pivot in a second direction.

Abstract: The invention relates to an engine control valve including a body defining an inner duct and comprising a flap (10) mounted such that it can pivot by means of a shaft (12), said flap (10) comprising a first portion (11). The flap can pivot between an open position allowing the passage of fluid into the duct and a closed position in which the flap (10) comes into contact with a flat seal (100) of the flap. The outer contour of the seal (100) surrounds the outer contour of the flap (10), said seal (1) comprising an opening (6) and a solid portion (3). The above-mentioned first portion (11) seals the opening (6) in the seal (1) when the flap (10) is in a closed position. The seal (100) includes a reinforcement area (101) in the solid portion (3) thereof, such as to prevent the seal (100) from deforming owing to the high pressure and high temperature of the gases in the valve.

Abstract: In an engine control valve having a body delimiting an internal duct and including a flap mounted such that it can pivot via a spindle of the flap, the flap includes a first part and is able to pivot between an open position that allows gases to pass along the duct, and a closed position in which the flap comes into contact with a flat seal inserted between two elements of the valve body, the seal has an exterior contour that externally surrounds the exterior contour of the flap, the seal includes an opening and a solid portion, the first part closes off the opening of the seal when the flap is in a closed position, and the seal includes at least one slit formed in the peripheral zone of the solid portion, the at least one slit communicating with the opening.

Abstract: A passive valve assembly for an engine exhaust system includes an exhaust conduit for transferring exhaust gases from the engine and a valve plate that is operably disposed within the exhaust conduit. A pivot rod has an internal section that is coupled with the valve plate, such that the valve plate may pivot between an open position and a closed position. The pivot rod also has an external section that protrudes from the exhaust conduit. A stop feature is disposed at or near an exterior surface of the exhaust conduit in a location arranged to contact the external section of the pivot rod and prevent the valve plate from pivoting beyond one of the open position and the closed position.

Abstract: A flap bearing system for a flap shaft in a motor vehicle includes a first radial bearing within which is arranged a flap shaft comprising a flap shaft end. A ratable flap body is arranged on the flap shaft. A flow cross-section of a channel housing is controllable by rotating the flap shaft with the flap body. A first bearing housing surrounds the first radial bearing. A bearing housing cover comprises an opening through which the flap shaft end protrudes. The bearing housing cover closes the first bearing housing. A sleeve radially surrounds a section of the first bearing housing. A circumferential groove is formed at an outer circumference at the section of the first bearing housing surrounded by the sleeve. The flap shaft end protruding from the first bearing housing is arranged geodetically so as to be at a same height or above an opposite flap shaft end.

Abstract: A butterfly valve and a valve system using the butterfly valve are disclosed. The butterfly valve includes a valve body and a valve disk disposed in the body such that the valve disk may be rotated between at least a first position and a second position using a linear actuator. The actuator may be a linear solenoid coupled to the valve disk spaced a distance from the axis of rotation of the valve disk.

Abstract: The invention relates to a butterfly valve, comprising a passageway, a valve seat enclosing the passageway, a rotatable valve shaft which has an axis of rotation spaced from a plane through the valve seat, a valve plate member fixed to the valve shaft and being located in the passageway, and seal enclosing the valve plate member. The valve plate member has an open position and a closed position. At least in a plane through the seal in the open position, the width of the passageway adjacent to the valve seat as viewed from the valve seat in the direction of the axis of rotation is larger than the width of the passageway at the valve seat. Due to this configuration leakage via the seal in the closed position is avoided, because of minimal deformation of the seal in the open position.

Abstract: A valve including a valve body having a central bore for passage of fluid there through and a longitudinal axis. The valve can also include a seal installed within the valve body along the central bore. The seal can include a first seal member having an annular ring portion and a hub portion extending from the annular ring portion. The seal can also include a second seal member including an annular ring configured to engage a distal end of the hub portion and create a sealing engagement between the hub portion and the annular ring when a compressive force is applied to the first and the second seal members.

Abstract: An aircraft cabin pressure control system outflow thrust recovery valve includes a frame, a valve element, and actuation hardware. The frame, valve element, and at least a portion of the actuation hardware are made of composite material. The actuation hardware is disposed external to the frame.

Abstract: This valve is integrated into a fluid distribution network and enables selective interruption or authorization of the circulation of a fluid. The valve includes a fluid blocking member driven in rotation by an actuator device of the valve and at least one journal, a hollow body inside which the blocking member is mobile and which defines at least one bore for receiving the journal, and a bearing disposed around each journal and inside the bore of the body enabling support of the journal and guidance thereof in rotation relative to the bore, thereby centering the journal. The valve further includes a device for immobilizing and sealing for maintenance the journal relative to the body of the valve. This immobilization device is disposed on the same side of the bearing as the internal volume of the hollow body and is maneuverable via the bearing to go from a non-clamped first configuration to a clamped second configuration in which it immobilizes the journal in the bore and vice versa.

Abstract: For a flap assembly, in particular an exhaust gas flap assembly, with the flap mounted on both sides via bearing devices in the housing, the disclosure describes a design in which a bearing body is supported radially against an annular collar of the bearing device and, by way of the annular collar, is held braced in a radially spring-loaded manner in a predefined radial position.

Abstract: A butterfly valve including a valve body having a passage, a valve shaft assembly, a valve plate, and a tube that is friction fit inside the passage is provided. The valve shaft assembly includes a first shaft portion and a second shaft portion. The first and second shaft portions are in opposing spaced relation with the valve plate disposed therebetween. The valve plate has a flange such that when the butterfly valve is in the closed position a seal is formed with the tube, which is disposed within the fluid flow passage. The valve plate has lip extending from a portion of the valve plate that is radially outward from the circumference of the tube. The lip acts to reduce flow induced torque experienced while the valve plate is actuated from the closed to the open position.

Abstract: A butterfly valve (100) is provided. The butterfly valve (100) includes a valve body (103) including a valve bore (109) passing through the valve body (103), with the valve bore (109) including an upstream valve bore portion (109U) and a downstream valve bore portion (109D), a shaft bore (112), a valve shaft (121) located in the shaft bore (112) and extending substantially across the valve bore (109), and a valve flap (107) affixed to the valve shaft (121) and configured to be rotated by the valve shaft (121). The valve flap (107) is configured to rotate between a closed orientation blocking the valve bore (109) and an open orientation. The valve flap (107) is affixed on an upstream valve bore portion side of the valve shaft (121), wherein incoming fluid presses the valve flap (107) against the valve shaft (121).

Abstract: A system and method for variable exhaust mixing is provided. A variable exhaust mixing device including a butterfly valve is positioned in an exhaust stream and the butterfly valve is opened more to decrease mixing and closed more to increase mixing. The increased mixing provided by the variable exhaust mixing device allows the injection of dosed fuel into the exhaust stream at a lower exhaust flow rate.

Abstract: A vehicular air intake is configured to produce a turbulent intake air flow in a cylinder of an engine. The air flow may be provided as a vortex. A throttle valve, for controlling an amount of intake air provided to the engine, has a pivot shaft with an axis which is offset from a center axis of an air intake passage in which the throttle valve is installed, and a throttle plate affixed to the pivot shaft. The pivot axis is offset and spaced away from the central axis of the throttle body such that a first portion of a throttle plate disposed on a first side of the pivot shaft, is larger than a second portion of the throttle plate disposed on a second side of the pivot shaft. This arrangement provides the non-uniform turbulent air flow into the engine.

Abstract: A fire hydrant break off valve includes an offset pivot and a lateral trigger captured between a fire hydrant and fire hydrant break off riser. When a collision breaks the break off bolts holding the fire hydrant to the hydrant break off riser, the lateral trigger is released and the valve rotates to a closed position. Force of water attempting to escape rotates the valve around the offset pivot. The edge of the valve is tapered and after rotating, the valve is pushed against a matching seat to close the valve. The match of the tapered valve against the tapered seat stops or nearly stops all flow of water from the broken hydrant.

Abstract: A throttle device, includes a housing, a gas conduit, a throttle shaft, a throttle body movable by means of the throttle shaft. According to the invention, a bearing is provided for supporting the throttle shaft on the housing, in which for sealing off an interstice in fluid-tight fashion between the throttle shaft and the housing, and in particular outside the bearing, a viscous medium is disposed in the interstice.

Abstract: A shut-off device for low-temperature media includes a housing (2), a valve seat (5) located in the housing (2), and a valve (3) that cooperates with the valve seat and is pivotally supported in the housing (2). On the housing (2) there is at least one flange (10) for mounting the shut-off device in a pipeline. The low-temperature shut-off device, low construction cost and low maintenance cost is achieved because the flange (10) of the housing (2) is designed as a welding flange (10a, 10b) for attachment of the shut-off device (1) in the pipeline by a weld joint, especially a butt weld joint, and because the housing (2) is provided with a housing opening (11) for mounting and/or removing the valve (3).

Abstract: A valve is provided and includes a component including a surface and a wear plate including a surface disposed in sliding engagement with the surface of the component. The surface of the wear plate includes a corrosion resistant substrate, a secondary layer disposed on a surface of the corrosion resistant substrate, a noble metal layer disposed on a surface of the secondary layer and a tertiary layer disposed on a surface of the noble metal layer.

Abstract: A flow controller is provided. The controller includes a shell body, a first supporting member, a driving shaft and an elliptical valve. The shell body has a passage passed therethrough. The first supporting member is assembled to the shell body. The driving shaft is assembled to the first supporting member. The elliptical valve is pivotally assembled in the passage and is connected with the driving shaft. The elliptical valve is rotated by the driving shaft for opening or closing the passage. When the passage is closed by the elliptical valve, the elliptical valve tightly abuts against an inner circular wall of the shell body for completely closing the passage, so that the controller is suitable in a high temperature and high pressure environment.

Abstract: Bearings 18 and 19 each are formed to have an inside diameter gradually extending toward two ends along an axial direction of a shaft 20 such that the inside diameter of the bearing is smaller at the center portion thereof and is larger at the two ends thereof.

Abstract: The invention relates to a valve device and to a method for transferring a transfer medium, said valve device and method having an inflow, an outflow and two valve disks which are arranged one behind another in the direction of flow and are pivotable about a common rotational axis for opening and closing the lumen which surrounds them, wherein the inflow and the outflow are formed by two housing sections which are lockable together, the ends of which facing one another receive in each case a valve disk with a fixedly connected half-shaft, wherein, with the housing sections in the locked state, the two half-shafts form one common shaft which is pivotable about the rotational axis and the valve disks abut closely against one another, and wherein, with the housing sections in the non-locked state, the valve disks in each case close the lumen of the housing section receiving them.

Abstract: A butterfly valve for use with a tank trailer includes housing, a lateral extension, a shaft provided through the extension, the back end of the shaft having a seat for accommodating a handle thereon, and further extensions may connect with the first mentioned extension. The handle turns the butterfly valve between opened and closed positions.

Abstract: Disclosed is a butterfly valve capable of controlling fluid flow according to rotation of a disc. The butterfly valve includes a valve body having an inner space of which two end portions are open; first and second discs disposed to face each other at the inner space, installed to be rotatable between an open state and a closed state of the inner space, and configured to selectively open and close the inner space; first and second sealing members mounted to the valve body, and configured to contact the first and second discs, respectively in the closed state; and a disc controlling apparatus configured to move the first and second discs to a direction contacting to or spacing from the first and second sealing members in the closed state. Under this configuration, durability and a sealing function may be enhanced.