Abstract: A gate valve unit is provided for controlling the flow of a fluid through a conduit. The gate valve unit includes a valve body including a conduit connector member or flange. A valve face block affixed to the valve body includes first and second backwardly sloped surfaces. A pair of movable gate leaves are disposed on the first and second surfaces of the face block and are movable away from and toward a central passage through the unit for controlling fluid flow through the unit. A face seal provides a seal between the surfaces of the face block and the gate leaves. A visor seal is attached to the valve body which is movable between an operative position in which the visor seal provides sealing between the gate leaves, and an inoperable position away from the gate leaves so as to not interfere with the operation of the gate leaves.

Abstract: Described is a valve that is useful for the accurate control of fluid flowing through the valve. The valve comprises a valve body and a flow control mechanism. In the preferred embodiment, the valve body is a two-part body having a fluid flow section and a valve adjustment section. Necessarily, the fluid flow section has a fluid flow inlet and a fluid flow outlet. The fluid flow section further comprises a fluid flow cavity, which is in fluid communication with the fluid flow inlet and the fluid flow outlet. The fluid flow cavity further includes a flow control orifice area, which flow control surface being smaller in cross-sectional area than the fluid flow cavity in order to reduce unwanted effects such as the venturi and the like. The flow control mechanism has a flow control surface, which works in with the flow control orifice area. Because of its construction the flow control mechanism is able to vary the length of its major axis via a force provided by the valve actuator.

Abstract: A device for closing pipes, in particular conveyor pipelines for gas or fluid media, which device comprises an annular carrier extending transversely of the passage of the pipe for a number of plates supported pivotally relative to the side wall of the carrier, in addition to a control ring which is arranged coaxially of the annular carrier and which is in engagement with all plates, which control ring and carrier are rotatable relative to each other on the common central axis thereof such that the plates are movable from a first position, wherein the passage is left clear, to a second position wherein the passage is closed, and vice versa, wherein each plate takes a triangular form, wherein the pivot point with the carrier is arranged outside this triangle, which triangular plates together precisely close the passage.

Abstract: A variable orifice valve for controlling fluid flow in a conduit, comprising a band or other movable members defining an opening for passing the fluid therethrough, the band mounted transverse to the direction of fluid flow in the conduit, so that the band opening is at least partially in the conduit. The band is movable relative to the conduit, to change the amount of the opening exposed to fluid flow.

Abstract: An improved ram bore profile for use with a variable bore ram packer designed for use in a standard ram-type blowout preventer used in oil and gas drilling operations is disclosed. The improved ram bore profile in the ram body is a substantially U shaped cutout in the front face of the ram body. The U shaped ram bore profile extends between the upper surface and lower surface of the ram body. The substantially U shape of the improved ram bore profile is further characterized by having an arcuate rear portion with a pair of diverging sides that extend outwardly toward the front face of the ram body to a front throat that intersects perpendicularly the front face of the ram body. The improved ram bore profile is capable of being used with variable bore packers of different configurations.

Abstract: A hopper for a weighing machine which has a tubular body and a closing valve which is comprised of several plates which are pivotably mounted around the bottom of the hopper for movement in a plane transverse to the axis of the hopper. The plates are simultaneously driven between open and closed positions by a common belt or chain so that the closing forces of the plates are balanced. The belt is coupled to a driving mechanism through a lever mounted on the hopper which disconnects from the driving mechanism when the plates are fully closed so that the hopper is freely suspended for weighing purposes. The plates scrape against the bottom of the hopper when opening so that material clinging to the plates is scraped off.

Abstract: A container for use in a closed application system includes a valve mounted to a discharge opening of the container and rotatable with the container for controlling the discharge of material from the container. The valve includes an element for engaging corresponding structure in a receptacle for receiving the contents of the container. The element engages and locks the valve in the receptacle when the valve is opened and the contents are being discharged from the container into the receptacle. The valve element and the corresponding structure on the receptacle cooperate so that the container can only be received in and removed from the receptacle when the valve is closed. In this manner, the contents in the container can be discharged only when the container is received within the receptacle and the container is rotated in a direction to open the valve.

Abstract: A safety system for a fluid conduit comprising a flexible fluid conduit having first and second ends, a first valve seat disposed at the first end of the conduit and a second valve seat disposed at the second end of the conduit. The first and second valve seats are positioned a first predetermined distance from each other. A first plurality of valve bodies are disposed at the first end of the conduit and a second plurality of valve bodies are disposed at the second end of the conduit. The first and second valve seats are disposed between the first and second plurality of valve bodies, with the first and second plurality of valve bodies positioned a second predetermined distance from the first and second valve seats, respectively.

Abstract: A fail-safe HVAC damper apparatus comprises a duct channel with a closure comprising one or more quadri-panel hinged elements, each with four panels connected by four parallel hinge pins. A gear shaft with a toothed gear is controllably rotated to linearly drive a spring-biased plate to move one of the hinge pins of each quadri-panel element between an open and a closed position. A drive motor may be activated to open or close the closure, e.g. by a smoke detector or other controller. A meltable fuse in the duct channel may be connected to a disconnect which uncouples the gear shaft and toothed gear, and a spring moves the closure to a default closed or open position.

Abstract: A shut-off device for selectively stopping the flow of conveyed loose bulk materials in a conveyor conduit includes a housing (2) with a flow passage (3) therethrough, and at least one shut-off element (4, 5) movably arranged in the housing. The at least one shut-off element (4, 5) is driven by at least one drive (7, 8) and is arranged in such a manner that it moves between a first open position in which the flow passage (3) is completely open, and a second nearly closed position in which the flow passage (3) is nearly but not completely closed. Namely, a flow gap (6) preferably having a dimension on the order of the particle size of the goods to be conveyed, remains open even when the shut-off element (4, 5) is in its most-closed position. Particles of the conveyed material become caught on or in the gap (6) to effectively close off and stop the flow of conveyed materials.

Abstract: The present invention provides a flow rate regulation apparatus capable of accurately measuring the flow velocity of air flowing through an exhaust duct and carrying out a flow rate regulation with high precision, though said exhaust duct may be short in length. The flow rate regulation apparatus according to the present invention comprises a means for regulating the sectional area of a passage in an exhaust duct, where the passage is formed at the center of said exhaust duct and said passage is shaped to be symmetrical with respect to the center axis AX of said exhaust duct as a basis. Since the passage formed in the exhaust duct by the passage sectional area regulation means is shaped so as to be symmetrical, no turbulence takes place in an air current flowing along the center axis AX of the exhaust duct. Flow velocity can be accurately determined and maintained by using air velocity measurements along the center axis.

Abstract: A valve (1) for an explosion protection apparatus comprises a pipe element having a pipe wall (11). Two slides (15, 15') can be pushed from the outside into the pipe element, through in each case one opening (111, 111') in the pipe wall (11). An expandable diaphragm (14) is arranged on the inside of the pipe wall (11) and forms an inner pipe which can be closed by means of the slide (15, 15') by mutually opposite diaphragm regions being pressed against one another. The expandable diaphragm which forms an inner pipe does not provide any accretion points for solid particles of product-loaded gas flow to collect on.

Abstract: An exhaust system has an air exhaust duct having a charge opening and a discharge opening and defining an air flow path. A damper is mounted in the duct for maintaining a constant air velocity for air exiting the discharge opening. The damper has opposing damper blades pivotally mounted within the duct. Each damper blade has an end that is pivotally mounted in cantilevered fashion within the duct so that an opposing end is free to move within the duct. Each damper blade is parabolic in shape and minimizes the air turbulence over the damper blade and reduces vibration. Each damper blade can be pivoted in response to a change in air volume discharged through the discharge opening to maintain a desired velocity of air through the discharge opening.

Abstract: A switch-over valve for a compound water meter includes an annular-shaped housing defining an annular valve seat and a central throughflow cross section, a pivot extending across the housing and supported at opposite ends in opposed portions of the housing, a closure member formed by a divided flap having a pair of wings disposed along opposite longitudinal sides of the pivot and articulated by the pivot for movement between opened and closed positions relative to the annular valve seat and the central throughflow cross section and a spring disposed about the pivot biasing the wings toward the closed position. The two wings of the divided flap are connected hinge-like one with the other along and via the pivot which extends along and in the region of division of the flap. The divided flap, due to its construction, has gaps along its region of division and along the pivot which are covered by a flat flexible seal disposed on an upstream side of the divided flap.

Abstract: A baffle system for control of fluid delivery using manual or automatic control. The fluid supply bore is controllably occluded using a plurality of individual baffle elements. Each of the individual baffle elements is secured at two places.

Abstract: A variable orifice dual gate valve having two opposed slidable valve gates in overlapping sliding contact relationship. Inner orifice edges of these plates coact to form a variable size orifice in the valve body upon simultaneously sliding of the valve gates in opposite directions through manipulation of a gear and screw drive mechanism. The gear and screw drive mechanism includes a handle drive shaft connected at an exposed end to a valve handle and a drive gear is secured to the other end of the handle drive shaft for axial rotation. This drive gear is meshed in driving engagement with two driven gears that in turn are respectively secured to drive right hand lead screw and left hand lead screw shafts. A right hand follower nut and a left hand follower nut are respectively threadably received on these lead screw shafts and gate slide drive shafts are in turn secured to these nuts respectively for follower movement with the nuts.

Abstract: Apparatus and a method for controlling the flow rate of viscous materials through a nozzle includes an apertured main body and an apertured end cap coupled together and having an elongated, linear flow channel extending the length thereof. An end of the main body is disposed within the end cap and includes a plurality of elongated slots concentrically disposed about and aligned with the flow channel. A generally flat cam plate having a center aperture is disposed between the main body and end cap and is rotatable about the flow channel. A plurality of flow control vane assemblies are concentrically disposed about the flow channel and are coupled to the cam plate. Each vane assembly includes a vane element disposed adjacent the end of the flow channel.

Abstract: A temperature-actuated valve device which comprises a body 5 provided with a fluid inlet opening 6b and a fluid outlet opening 5a, a vale seat 5b formed on the peripheral edge of the outlet opening 5a, a main valve body 8 which is disposed movably within the body 5 in the flow direction of fluid and which is brought into and out of an abutting engagement with the outlet opening 5a to perform the opening and closing operation, a pilot valve body 7 which is disposed movably within the body 5 in the same direction as the direction of movement of the main valve body 8 and which is of a tubular shape causing a change in the fluid pressure acting on the upstream side or the downstream side of the main valve body 8, and a temperature-actuated spring 11 which is linked to the pilot valve body 7 and which deforms when it reaches a predetermined temperature and above.

Abstract: A regulation device and method for regulating an air flow, a gas flow or an equivalent medium flow in which slats can be moved to form an adjustable flow passage in their interior and have lateral edges overlapping each other. The cross-sectional flow area of the flow passage defined by the slats in their interior is adjustable by displacing the slats. A wire is passed around the slats and is displaceable so as to displace the slats and thus regulate the flow passing through the flow passage defined by the slats.

Abstract: A combustor for generating hot gas in order to rotate a turbine is able to burn fuel with a high vanadium content without emitting appreciable vanadium pentoxide to the turbine. The combustor includes a primary combustion zone for burning fuel in a rich fuel/air environment a quenching zone for cooling the hot gas and unburned fuel a secondary combustion zone for burning previously-unburned fuel. The fuel burned in the secondary combustion zone raises the temperature in the secondary combustion zone above the temperature of the quenching zone. The result of burning the fuel in a rich environment in the primary combustion zone is that most of the vanadium present in the fuel forms vanadium trioxide or vanadium tetroxide rather than vanadium pentoxide. Cooling the hot gas quickly in the quenching zone removes most of the remaining vanadium pentoxide by transforming it to vanadium trioxide or vanadium tetroxide.

Abstract: An automatic fluid control having a first and second tube members and a slidable valve element capable of moving from a sealed closed position to an open position permitting fluid passage therethrough. In a preferred first embodiment, the elastomeric valve element is slidingly received with a passageway in the first tube. The valve element has a flange portion containing a plurality of slits that, when inverted and stretched, permit fluid to pass therethrough, but when closed, are in contact with the inner wall of the first tube and prevents fluid from passing therethrough. The valve element also can have a rigid plug attached within an opening in the top surface to present a preferably non-deformable contact point for a male luer tip, which, when pressed downward on the valve element, breaks a seal between the valve element and the first tube inner wall.

Abstract: A dispensing machine has a passageway for product with an upper inlet for receiving product and a lower outlet for dispensing product, the outlet is provided with a closing means which serves to retain the product within the passageway. The closing means has three blades pivotally mounted for movement in a substantially horizontal plane between a closed position in which the blades engage one another generally centrally of the passageway and an open position in which the blades are separated to allow product to drop out of the outlet, movement of the blades being controlled by a common drive crank with links connecting the blades to the common drive crank.

Abstract: A radial rotary slide valve for controlling a steam flow rate in a steam turbine, includes an immobile fixed ring and a rotary ring which is disposed concentrically on the latter in such a way as to be rotatable into an angular position that can be varied through the use of a servo motor. The rotary ring has first control profiles which correspond to corresponding second control profiles belonging to the fixed ring in such a way that control slots situated between the control profiles can be varied for opening or closing. The rotary ring is divided into a top part and a bottom part by a joint in the region of a joint in the casing. In order to optimize the play required for sliding between the fixed ring and the rotary ring, the top part of the rotary ring and the bottom part of the rotary ring can be connected to one another by a suitable connecting device for varying the distance between at least two opposing half-ring ends.

Abstract: Apparatus for coupling to an aircraft a high pressure air flow from ground equipment to start engines includes a hollow housing attachable to the ground equipment. A pair of members defining a first valve form a clamshell within the housing. Such members are biased to a closed relationship and are rotatable to an open relationship. A hollow coupling member includes a ring for rotating such valve members equally to the open relationship in response to incremental linear movements of the ring member. The coupling member receives a hollow start nipple in the aircraft. A pair of members defining a second valve form a clamshell rotatable within the housing in a direction opposite to the direction of the first clamshell rotation. The second valve members are biased to close such valve and are rotatable to an open relationship. The coupling member includes prongs which act linearly on the second valve members, in a manner similar to the ring action on the first valve members, to open such valve.

Abstract: An air intake assembly for a combustion oil burner, the assembly comprises a housing having a front wall, a back wall and a peripheral side wall between the front wall and the back wall, the housing defining an air intake chamber therein, the front wall having a partly circular air intake hole therein, an axle mounted to the housing between the front and the back walls, first, second and third rotatable vanes rotatably mounted to the axle and positioned adjacent to the air intake hole, the first rotatable vane is fixedly attached to the axle, and a mechanism mounted on the rotatable vanes for sequentially rotating the rotatable vanes whereby the air intake hole can be selectively opened from 0.degree. open where substantially no air can pass through the hole and into the air intake chamber, to approximately 270.degree. open where air can flow into the chamber.

Abstract: A non-drip valve for the discharge of liquid comprises a through-flow channel (2) from whose end the liquid emerges and at least one elastic member (12) within the through-flow channel (2) which reduces its volume when the pressure in the liquid increases and thereby frees the through-flow channel (2) and which enlarges its volume when the pressure of the liquid flow decreases and closes the through-flow channel when the pressure of the liquid flow falls below a certain pressure value.

Abstract: An air duct door controls air flow through an air duct in a vehicle. The door has two panels connected together that slide relative to one another as a free end of the first panel pivots and the free end of the second panel is constrained to move in a fixed path to conserve space. The first panel has a central slot and the second panel has a stop member riding in the slot to limit extension of the door. Rails are used to effect sliding movement and to lock the panel members together.

Abstract: A fast-acting high-output valve is provided comprised of a valve body covering an opening, a means for applying a force to the center of said valve, and a means for transforming said force to opposite movement at the periphery of said valve body. As the valve body periphery is moved opposite from the opening covered by the valve body, an annular gap is created through which fluid may flow. When the force to the center of the valve body is eliminated, the valve body periphery drops back into place and the valve closes.

Abstract: A method and apparatus controls the flow rate of a fluid that flows through a fluid path including a resiliently deformable portion. A first roller has a cutout formed thereon on one side thereof, and a retainer is arranged in parallel with the first roller. The resiliently deformable portion of the fluid path is held between the first roller and the retainer. The first roller is rotatably supported by its rotary shaft. The first distance from the rotary shaft to the outer wall of the first roller on the side facing opposite the resiliently deformable portion may be varied in response to the variation in the angle that occurs when the first roller rotates about its rotary shaft.

Abstract: A port throttle valve and an intake system incorporating the valve is disclosed. The valve is disposed between one of two intake runners delivering air to the intake port of an engine cylinder and includes a base member having an opening for delivery of air therethrough. The base includes a track in which is slidingly disposed, two adjacent valve plates each having an opening for registry with the opening in the base member to allow for the passage of air. When moved, in opposite longitudinal directions, the edges of the openings in the valve members move towards one another to terminate registry of the openings with the opening in the valve body.

Abstract: The invention relates to a valve of the iris diaphragm type.The valve comprises first and second annular body members having respective first and second recesses therein and an annular recess between such first and second body members. A flexible valve closure sleeve is provided with first and second annular mounting flanges at opposite ends and an intermediate flange. The first and second mounting flanges are engaged respectively in the first and second recesses, and the intermediate flange disposed in the annular recess defined between the first and second body members so as to be angularly moveable relative thereto and relative to the first and second annular mounting flanges. Operating means are connected with the intermediate flange for moving the flange between closed and open positions corresponding to closed and open positions of the valve closure sleeve.

Abstract: A dump gate assembly as for a feed mixer housing including first and second hinged gates swingable between upper closed condition and lower open condition, each gate having a cam track preferably in the form of a configurated gate stiffener cooperable with a cam follower on an actuator. The cam tracks have a portion causing greater force to be applied to the gates during the final movement of the gates to the closed condition. The actuators for the two respective gates are at opposite ends of the gates and are interconnected to cause timed gate closing. A special seal element causes a second seal between the closed gates.

Abstract: A valve operating mechanism which opens and closes a passage communicating to a cavity by contraction and restoration of a packing, with little mechanical movable parts for the opening/closing operation.

Abstract: A device is proposed which has a nozzle, in particular constructed to resemble a Laval nozzle, as a control device for setting a prescribed fluid mass flow and in which for the purpose of varying the flowing gas quantity the nozzle cross section or the nozzle geometry can be variably set during operation.

Abstract: A vascular access sheath is provided for introducing catheters, stents, and other interventional devices into blood vessels. The invention comprises a stiff tubular catheter segment, which is designed to remain outside the body, having two hemostatic valves, most preferably of an iris valve design disposed at each end. A flexible sheath extends from one of the valves for insertion into the blood vessel. In operation, the valves are opened and closed one at a time, to allow relatively large devices to be introduced into the blood vessel without the valve pressing against the devices and with minimal loss of blood.

Abstract: A cam operated valve mechanism for directing the flow in a fluid flow duct to selective alternative outlets. The valve comprises an annular array of segmented elements which are each pivotally mounted to an axially translatable sleeve disposed coaxially within the duct. In a first axial position the sleeve extends across port and starboard alternative flow outlets, and in a second axial position extends downstream thereof. Each valve element comprises a cam follower which engages an axially extending cam track formed in the duct surface. The profile of the cam track is such that translation of the sleeve from its first to second axial position causes each of the valve elements to rotate from a stowed to a deployed position, and thereby obturate the duct.

Abstract: A method and apparatus controls the flow rate of a fluid that flows through a fluid path including a resiliently deformable portion. A first roller has a cutout formed thereon on one side thereof, and a retainer is arranged in parallel with the first roller. The resiliently deformable portion of the fluid path is held between the first roller and the retainer. The first roller is rotatably supported by its rotary shaft. The first distance from the rotary shaft to the outer wall of the first roller on the side facing opposite the resiliently deformable portion may be varied in response to the variation in the angle that occurs when the first roller rotates about its rotary shaft.

Abstract: An apparatus for ventilating spacious public rooms, workshops, industrial halls, underground parking lot and the like spaces, which apparatus comprises a damper having a plurality of shutters attached by a ring to inner surface of tubular body so as to radially move a series of shutters from shut position to opened position. The apparatus further comprises a nozzle having a plurality of guide vanes which occur swirls in jet as well as in injected ventilation air supplied to the rooms. With this arrangement, the apparatus is effective for obtaining a precise adjustment of supply air with minimum air resistance, non-turbulent, and protecting dwelling zones against undesirable thermal air streams or undesirable radiation.

Abstract: An apparatus for conveying thick matter is provided including a delivery line, a thick matter pump connected to the delivery line for conveying thick matter from the pump through the delivery line in an output direction, and a restraining member positioned in the delivery line. The restraining member includes a first group of finger lamellae that are radially arranged and have openings therebetween. Each of the finger lamellae of the first group includes an end secured on the inner surface of the delivery line and an unattached end extending diagonally in the output direction and toward the inside of the delivery line. The finger lamella thereby define a pass-through opening therein for enabling flow of thick matter through the restraining member such that the pass-through opening increases in size when thick matter flows in the output direction and decreases in size when there is no flow of thick matter or when thick matter moves in a direction opposite to the output direction.

Abstract: An improved bug-proof and odor-proof draining outlet structure is particularly adapted for use on floors and is equipped with a pair of symmetric semi-circular blockage flaps that are pivotally fixed at the bottom periphery of the draining outlet and are one-way openable. At one side of each flap is disposed a counterweight so that as water is discharged via the blockage flaps, the same will be pushed opened, permitting water to be expelled out, and then automatically closed due to gravity exerted on the counterweights. Water is directly discharged into a duct without moving against the wall of the duct so as to make the discharge of the water in a more smooth and effective manner. Besides, the bottom periphery of the draining outlet is provided with a pair of supporting lugs each having a slot-like opening so that a pivot pin fixed to the underside of each blockage flap can be in snap engagement with each supporting lug with ease.

Abstract: Balanced piston fluid valve, wherein annular outer and core inner coaxial valve members are adapted to move to and fro slidably relative to one another and to bar upstream-to-downstream fluid flow when mutually juxtaposed into seated position but adapted to enable such flow when spaced apart in unseated position.

Abstract: A bladder type damper assembly formed of a flexible envelope of fluid impermeable plastic material incorporating an insert made of two segments of rigid sheet material joined in hinged relation at one edge and moveable between a flat association and a preselected open angular orientation. The fluid conformable portion of the bladder envelope between the open edges of the insert segments provides a folding region in the form of a valley configuration provided by seaming the two overlapping layers of the bladder between the two insert segments when folded in flat relation. The seam is formed by applying heat and pressure to the two bladder layers through an opening in one or both of the insert segments with separator material appropriately placed.

Abstract: A reduced height dust valve is described which is used in a trap which utilizes a pair of said valves to remove dust from, for example, a vacuum line, is described. The valve includes a body having a longitudinal flow path, a valve seat detachably mounted in the upper portion of the body and opposed flapper plates which seat against each other to close the valve or are rotated downwardly by actuator shafts to open the valve. The flapper plates define adjacent edges which seat against each other by a sliding action permitted by movement of one of the two actuator arms.

Abstract: A rotary servo or throttle valve comprises a housing defining a chamber and discharge port in fluid communication with the chamber, a rotary valve spool for delivering fluid into the chamber, and a system for delivering pressurized fluid passing from the outlet opening of the valve in the chamber to the discharge port in the housing in which non-cavitating technology can be readily incorporated. The outlet opening of the valve spool is a wedge shaped groove formed in its periphery, the groove having opposed, arcuately diverging sidewalls. The diffusing system comprises an elongated member which may be rotated in the chamber to align a plurality of flow paths with the discharge port and the outlet opening. The elongated member and valve spool may be rotated independently in opposite directions to obtain faster flow rate changes.

Abstract: A nozzle damper assembly (10) for installation in a duct (12) operative for measuring and controlling the flow of a gaseous medium through the duct (12). The subject nozzle damper assembly (10) includes enclosure means (24) cooperatively associated with the duct (12), shaft means (26) suitably supported from the sidewalls (32, 34, 36, 38) of the enclosure means (24), damper blade means (16,18) rotatable mounted on the shaft means (26) for movement within the enclosure means (24), damper blade operating means (28) operative for purposes of effecting the movement of the damper blade means (16,18) within the enclosure means (24), and flow measurement means (20,22) supported at a first location and at a second location relative to in lieu thereof the damper blade means (16,18) and operative to measure the flow of the gaseous medium through the nozzle damper assembly (10) such that control may be exercised over the flow of the gaseous medium through the duct (12) based on such measurements.

Abstract: A Variable orifice sealing valve made from a thin, elastic cylinder. The cylinder is retained at both ends, and one end is twisted with respect to the other end thereby reducing the fluid flow path through the center of the cylinder. The device is particularly useful for medical procedures such as in conjunction with a catheter.

Abstract: A fluid flow control device comprises a duct having a masking membrane arranged within the duct for movement between a first position, in which it closes the duct, and a second position in which it allows fluid to pass through the duct. The masking member is in the form of a deformable membrane disposed across the duct, the membrane having two portions having bellows-type folds and opposed end elements defining between them a flow aperture, which can be opened or closed to adjust the fluid flow.

Abstract: A simple, low cost, and reliable, normally cyclic, fluid control valve that in preferred configuration includes one or more rotary valve elements where such valve elements have openings that align with each other and/or with a flow passageway thus forming an aperture for fluid flow during valve cycles. Rotary valve elements may be oriented in different directions to connecting ducts and may have a variety of shapes with a preferred shape being cylindrical. Simple motors drive rotary valve elements such that a rate of valve cycling and/or amount of aperture can be easily controlled by a controller such as a microprocessor. Easy valve servicing and installation are other features. Dynamic sealing of the fluids is preferably accomplished by use of simple low cost labyrinth seals.

Abstract: A valve device includes a valve body having an inlet bore formed therein, the valve bore having a bore axis. A first semi-circular plate having a first axis is disposed within said inlet bore. Rotation of the first semi-circular plate about the first axis results in incremental displacement of the first semi-circular plate between an open and a closed position. A second semi-circular plate having a second axis is disposed within said valve bore. The first and the second axis are substantially coaxial wherein rotation of the second semi-circular plate about the second axis results in incremental displacement of the second semi-circular plate between an open and a closed position.

Abstract: An adjustable orifice comprising two half plates movable with respect to one another with adjusting holes for positioning the plates and flanges for holding the half plates in position.