Abstract: A float controlled valve syphons water out of a swimming pool cover. The syphon valve includes co-operable male and female valve members disposed for mutually relative movement to bring them into and out of mutual engagement to thereby close and open flow communication through a syphon discharge passage formed in the male member. A float body is coupled to one of the said members for effecting the engagement and disengagement in response to the level of the water in the swimming pool cover. The male valve member is tapered at the forward end to facilitate engagement with a central recess in the female member. The female member is formed of more yielding material than the male member and has a thin walled portion receiving the male member and of sufficient flexibility to envelop dirt particles at the male-female member seal.

Abstract: A fast acting on/off valve formed of molded plastic components includes a molded plastic body bearing offset inlet and outlet passages which extend from opposite ends through integral nipples to a common area, with communication effected by way of a bore and counterbore for respective outlet and inlet passage portions. The end of the bore, at a shoulder formed between the bore and counterbore, is chamfered. A spool type plunger having lands at opposite ends is mounted within the counterbore and bore with one land sized to the bore and the other being sized to the counterbore, that land having a conical inside face at an angle corresponding to the chamfer. A coil spring is compressed between the larger diameter land end of the plunger and a cap which is welded to the valve body and closes off the counterbore, the spring biasing the spool type plunger to valve closed position.

Abstract: Indicator valve unit for providing a change in fluid pressure as a remote indication of whether an object occupies a desired position. Particularly useful for indicating whether a component, such as a multiple string tubing hanger, has been properly oriented and landed in an underwater well installation, the indicator valve unit provides for automatic separation of the sensing element of the unit from the sensed object as soon as the valve has been actuated.

Abstract: The present invention accordingly relates to hydraulic jars which include elongated telescopically arranged mandrel and housing members relatively movable between contracted and extended positions such members respectively having a hammer and an anvil with the anvil being spaced from the hammer when the members are in the contracted position and arranged for contract when the members are in the extended position. The jar includes hydraulic means for retarding movement of the mandrel relative to the housing member for a given time during a jarring stroke when the jar is tensioned. The hydraulic means includes a fluid-filled chamber having adjoining first and second bores, the first bore being of lesser diameter than the second bore and a piston on the mandrel member being receivable in the first bore with the piston having a slightly smaller diameter than the first bore to restrict the flow of fluid past the piston as it moves relative to the first bore during the jarring stroke.

Abstract: Mud choke apparatus is disclosed, and the preferred embodiment has the form of a hollow, tubular body receiving a mud flow introduced from a lateral port, the flow being directed through an axial passage and past a valve seat. The valve seat is a replaceable, hardened metal liner and is formed with a gradual taper so that the mud flows from the large end through the tapered, smaller end. Thereafter, it flows out of the body through an axial opening. The flow of mud is throttled by a tapered, hardened plug serving as a valve element which is received into the valve seat. A hydraulic cylinder and piston with a connecting rod move the plug. The plug has a surrounding, perpendicular shoulder which seals and seats against a shoulder on the insert to fully close the throttling valve apparatus. Flow is choked by inserting the tapered plug with controlled clearance into the tapered valve seat.

Abstract: An anti-lock brake device comprises a cylinder adapted to be installed in a pipeline connecting a master cylinder with one or more wheel cylinders of a vehicle. A solenoid-actuated operating member is slidable in the cylinder and is positionable to prevent fluid flow through the device. The operating member is biased into a position in which fluid flow is permitted, energization of the solenoid causing the operating member to prevent fluid flow and, by volume displacement of at least part of the operating member to reduce the fluid pressure on the wheel cylinder side of the device.

Abstract: A valve has a pressure chamber within its housing for remote operation. A stem in the housing has axial passages for power fluid and for cleaning liquid. The valve member is a sleeve, biased closed, which engages a movable seat which is resiliently supported. Leakage around the seals between the sleeve and the stem and between the sleeve and the housing is received in chambers and drained away from the housing to prevent mixing of the cleaning liquid and the processing liquids.

Abstract: A valve apparatus which comprises a main valve body and a main valve seat detachably abutting against each other to open and close a main fluid pass defined therebetween, and wherein, as measured from the longitudinal section of the valve apparatus, the detachably abutting plane of the main valve seat has a larger curvature radius than that of the main valve body in order to let a fluid stream conducted through the main fluid pass flow along the surface of the main valve seat; and that part of the surface of the main valve body defining one side of the main fluid pass with the main valve seat which faces the throat section of said main fluid pass is provided with a sharp edge at its end portion to allow for the easy removal of a main fluid stream from the main valve body.

Abstract: To control the flow of fluid from a positive displacement pump to a consumer line, a rotating shutter periodically opens return flow nozzles which permit the pressure-free return of the pumped fluid to a fluid reservoir. In order to provide hydraulic balancing of the forces on the shutter, the return flow nozzles are disposed symmetrically with respect to the axis of the rotating shutter. Pressure peaks which occur when the return flow nozzles are closed cause undesirable noise generation and these pressure peaks are reduced by the disposition of separate check valves associated with each of the symmetric flow conduits. The use of separate check valves reduces the length of the fluid column which must be accelerated upon nozzle closure. To reduce the opening stroke of the check valve, the edge of the valve seat meanders thereby extending its effective length. Axial play of the rotating shutter is controlled by the disposition of a spring loaded glide block.

Abstract: A hydraulic valve is disclosed which has a gasket sealing against and, to a limited extent axially movable on, a movable valve member. The valve member has a radial shoulder sealing surface which is spaced from a matching, larger diameter concentric radial shoulder sealing surface of the body of the valve. The sealing surfaces can be aligned with each other by an axial movement of the valve element, with a radial spacing between them providing a fluid passageway. The gasket has an angular cross-section, with the apex being toward where the sealing surface of the valve element adjoins the valve element surface over which the gasket extends outward from the axis of the valve element. The angular relationship between the aligned sealing surfaces and the sealing portion of the gasket is such that when the gasket is moved toward the sealing surface of the body by the valve element, the outer lip of the gasket sealing portion first contacts the surface, thus significantly blocking fluid flow.

Abstract: A valve construction having a valve seat and a movable valve member for opening and closing the valve seat and being operatively interconnected to a thermal power element carried by the valve construction, the valve member having an annular metallic part for engaging the valve seat to close the same and having an annular flexible elastomeric part for also engaging the valve seat upstream from the metallic part to augment the closing of the valve seat. The annular flexible elastomeric part is molded to the metallic part to be carried thereby.

Abstract: This apparatus disclosed in its preferred form is a choke for controlling the flow of drilling mud which is highly abrasive. The abrasive drilling mud is introduced through a lateral port and an elongate, tubular body. In the tubular body, a fluid actuated, double acting piston is forced to a choke control position. The piston has appended to it a centralized, tubular extension which receives a sleeve of wear resistant material. The sleeve is positioned in a circular chamber communicated to the lateral port where the drilling mud is introduced. It travels toward a seat downstream of the body. The seat is formed of hardened material. The downstream outlet of the body is additionally lined with a wear resistant sleeve. An alternate embodiment is also disclosed. A hydraulic control system for operation of the choke is also disclosed.

Abstract: A valve including a resilient seal which contacts in a sealing relationship an annular valve seat having an offset annular surface area at the valve inlet against which the resilient seal of the valve is compressed by an overlying rigid member to reduce the liquid pressure against the valve seal, thereby easing the effort to close the valve.

Abstract: A water induction system for internal combustion engines which consists of a metering device for metering controlled amounts of air and water, a control valve which is vacuum operated and connected to the metering device to allow a predetermined amount of air and water to be drawn into a heater wherein the air water mixture is vaporized and admixed with the fuel air mixture entering the intake manifold.

Abstract: A self-cleaning valve plug and seat assembly for use within a valve chamber comprises a seat member extending into the chamber and having an inwardly converging frustconical seating surface thereon. A cylindrical skirt portion extending inwardly coaxially from the seating surface includes ports therein connecting with a fluid passage extending axially through the seat member. A valve plug includes a cylindrical bore extending partway thereinto and adapting the plug for sliding movement over the seat member skirt portion. The plug includes a surface intersecting the bore at an actute angle to provide a circular cutting edge at the open end of the bore. Means are provided for moving the plug axially toward and away from the seat member so that the plug is disposed clear of the seat member ports in the open valve position and covers the ports in the closed valve position with the plug cutting edge engaging the seating surface of the seat member in fluid-tight sealing relation.

Abstract: A dump valve apparatus is described which may be used to drain a chemical reactor tank. The valve includes a valve seat ring having a substantially vertical inner seat surface defining a discharge passage, a valve plug having a substantially vertical outer side surface which fits in the seat ring and a seal formed between such vertical sealing surfaces. The valve inlet and outlet openings are aligned with the vertical discharge passage through the seat ring and the sealing surfaces are vertical to minimize the amount of material deposited thereon. The outer plug side surface slides across the inner seat surface during opening and closing of the valve so that such surfaces wipe each other to remove deposited material and provide a self-cleaning valve. The inner seat surface is provided with a plurality of annular grooves containing elastic sealing members which engage the outer plug side surface to form a liquid tight seal which is resistant to the pressure created by the liquid within the tank.

Abstract: A straight compression valve is disclosed in which shutoff of flow of fluid is effected between surfaces of plastic material, but in which a washer of non-metallic material may be employed under certain conditions. When the washer is not used, the design of the sealing surfaces is such as to obtain a highly effective shutoff with a minimum of closing pressure, while avoiding breakage of parts of the valve adjacent the sealing surfaces. Means are provided for controlling the movement of the valve bonnet to prevent breakage thereof and other parts during such movement. The valve body is provided with flats or flat surfaces which are so disposed or positioned in relation to the valve as a whole as to enable the valve to be clamped in a vise for facilitating access to the stem and other parts of the valve. The use of packing glands is avoided through the use of an O-ring and its structural location in the valve.

Abstract: A solenoid valve is provided which includes an axially movable solenoid plunger for moving an elastic diaphragm away from a position engaging an outlet stub of the valve housing. According to one aspect of the invention, the plunger and the diaphragm are connected by way of a wire ring which engages the diaphragm at a position peripherally outside of the engagement of the diaphragm of the outlet stub, whereby the movement of the diaphragm from the closed position is accompanied by a shearing action at the sealing edges, resulting in self-cleaning of the sealing edges. According to another aspect of preferred embodiments of the invention, the sealing element which is movable along with the plunger controlled by the solenoid valve, is connected so as to initially move away from the sealing surfaces at only one side of the sealing element.

Abstract: An improved poppet valve is provided which includes a piston having a stem and a disk-shaped head attached to the stem. The piston is mounted to reciprocate in a cylinder, the internal wall of which has a seat formed therein to define a flow orifice between the cylinder seat and the disk-shaped head. The piston head includes a flat face on one side thereof and a working surface on the opposite face which is adapted to define the flow orifice with the cylinder seat. The working surface includes an annular face having a specifically defined shape and a portion connecting the annular face to the stem. The shape of the annular face significantly decreases the operating time of the valve to discharge the cylinder via the flow orifice. In one embodiment, the surface of the annular face has a conical shape and forms an angle in the range of 20.degree. to 60.degree. with the longitudinal axis of the stem.

Abstract: A medical patient or other individual exhales air through a pressure control exhalation valve at a pressure which remains substantially constant during exhalation and corresponds to the residual pressure desired within the lungs. The pressure control exhalation valve incorporates a disc-like valve member which is biased towards a closed position by a spring having a low spring modulus, and the spring engages a back-up plunger which is adjustable according to the desired residual lung pressure. The pressure control valve may be connected in series with a flow control or retard valve which is adjustable to produce a biofeedback pressure within the valve for teaching the individual to breathe slower and with less effort. During inhalation, pressurized air may be supplied to the pressure control exhalation valve through a demand inhalation valve which is adjustable to a supply pressure corresponding to the preselected exhalation pressure in order to provide for continuous positive pressure breathing.

Abstract: This apparatus disclosed in its preferred form is a choke for controlling the flow of drilling mud which is highly abrasive. The abrasive drilling mud is introduced through a lateral port and an elongate tubular body. In the tubular body, a fluid actuated, double acting piston is forced to a choke control position. The piston has appended to it a centralized tubular extension which receives a sleeve of wear resistant material. The sleeve is positioned in a circular chamber communicated to the lateral port where the drilling mud is introduced. It travels toward a seat downstream of the body. The seat is formed of hardened material. The downstream outlet of the body is additionally lined with a wear resistent sleeve.

Abstract: A gas valve has a valve seating surface and flexible valve member to insure that the gas flow is terminated when the valve closes. The valve seating surface has a flat portion around an opening and a raised portion around the peripheral opening. A cooperating flexible valve member has a flat portion and a raised portion around its periphery. When the flexible valve member moves against the seating surface, the raised portion of the flexible valve member engages the flat portion of the seating surface and the raised portion of the seating surface engages the flat portion of the valve member to form two concentric series connected seals to insure that gas flow through the valve is terminated.

Abstract: A low noise level valve for controlling high pressure fluid flow between an inlet and an outlet. The valve comprises a poppet movable along a given line with respect to a complementarily formed valve seat. The area between the poppet and valve seat comprises a series of spaced undulations which extend along a continuous curve of approximately 90.degree.. The undulations are disposed substantially parallel to the direction of poppet movement adjacent to the inlet and are substantially transverse adjacent to the outlet. The undulations define a plurality of orifices which are opened progressively from the outlet toward the inlet. The orifices act as pressure drops and also cause turbulence as fluid flows around the undulations, thereby holding the fluid flow below undesirable speed and noise levels. A balancing chamber may be provided to counter-balance the poppet movement. Sealing means may be provided by an undercut lip formed on a sealing member adjacent to the inlet.

Abstract: An improved poppet valve is provided which includes a piston having a stem and a disk-shaped head attached to the stem. The piston is mounted to reciprocate in a cylinder, the internal wall of which has a seat formed therein to define a flow orifice between the cylinder seat and the disk-shaped head. The piston head includes a flat face on one side thereof and a working surface on the opposite face which is adapted to define the flaw orifice with the cylinder seat. The working surface includes an annular face having a specifically defined shape and a portion connecting the annular face to the stem. The shape of the annular face significantly decreases the operating time of the valve to discharge the cylinder via the flow orifice. In one embodiment, the surface of the annular face has a conical shape and forms an angle in the range of 20.degree. to 60.degree. with the longitudinal axis of the stem.

Abstract: A straight compression valve is disclosed in which shutoff of flow of fluid is effected between surfaces of plastic material, but in which a washer of non-metallic material may be employed under certain conditions. When the washer is not used, the design of the sealing surfaces is such as to obtain a highly effective shutoff with a minimum of closing pressure, while avoiding breakage of parts of the valve adjacent the sealing surfaces. Means are provided for controlling the movement of the valve stem to prevent breakage of the valve bonnet and other parts during closing of the valve. The valve body is provided with flats or flat surfaces which are so disposed or positioned in relation to the valve as a whole as to enable the valve to be clamped in a vise for facilitating access to the stem and other parts of the valve. The use of packing glands is avoided through the use of an O-ring and its structural location in the valve.

Abstract: A valve actuator, for example a mechanism for imparting motion to a blast furnace evacuation valve, includes a force generator which is coupled to the valve member by a displacement mechanism including a pivotal lever and a pivot arm. The pivotal lever has a pair of angularly related arms with the free end of one arm being coupled to the force generator and the free end of the second arm being coupled to a point on the pivot arm intermediate the ends thereof by a connecting rod or rods. The pivot arm is connected to the valve member and the connecting rod or rods are articulated to both the pivot arm and to the second lever arm which may be telescoping.

Abstract: A metallic valve member having an annular, tapering sealing face makes practically line contact along a circle with a valve seat whose frustoconical inner portion is a sheet metal element having a rounded edge directed substantially at right angles toward the sealing face. An axial closing force applied to the valve member produces a much higher sealing force holding the edge of the seat engaged with the sealing face of the valve member.

Abstract: A poppet type check valve for controlled feeding of blowing agent into an assembly for the extrusion of thermoplastic polymeric foam material and, in particular, for controlled feeding of a blowing agent such as pentane into the barrel of an extruder assembly for extrusion of polystyrene foam; and an apparatus assembly comprising such a check valve in combination with the barrel of an extruder for extrusion of such foam materials.

Abstract: A control valve for a pulsating rocket engine comprises a valve seat and a movable valve part, one of which has a facing surface, of a non-deformable material, having a plurality of concentrically arranged saw-tooth shaped sealing ridges with flat sealing faces at their apices which extend perpendicular to the movement direction or force application direction. The other valve part has a facing surface of polytetrafluorethylene or polyamide which is initially smooth and plain but which, upon the first closing operation of the valve, responsive to a pressure load thereon exceeding a predetermined pressure load, is irreversibly deformed by the saw-tooth shaped sealing ridges, with flat sealing faces, of the other valve part to form therein grooves complementary to the sealing ridges.

Abstract: A needle valve having a stem movably carried in a body defining a flow chamber with the tip of the stem being provided with a soft movable valve portion adapted to have seating engagement with an annular valve seat of a body port. The soft movable valve element may be defined by a tubular sleeve formed of a cold flowable material. A tubular retainer is slidably carried about the sleeve to prevent undesirable radial expansion of the sleeve as a result of cold flow and to direct the cold flowed material of the sleeve inwardly about a retainer portion of the stem disposed within the body port when the sleeve is in seating engagement with the body seat. The retainer is arranged to limit the adjustment of the stem to a maximum inward position wherein a major portion of the sleeve is cold flowed into the body port.

Abstract: An eccentrically rotatable control valve has a seat ring containing two seating surfaces and a stationary sealing ring mounted on an inner wall of a valve chamber to form a port therein. Rolling movement of an eccentrically mounted plug of the valve from a partial to full line fluid tight sealing contact with one of the seating surfaces of the seat ring causes the seat ring to be simultaneously moved in a rocking manner and the other seating surface of the seat ring to be moved into fluid tight sealing engagement with the stationary sealing ring. The rockable seat ring construction provides a means by which the plug and its associated seat ring can center itself in a properly seated fluid tight position on the sealing ring in the event that the sealing ring is out of properly aligned seating surface engagement with the plug.

Abstract: A floating O-ring is located between a valve plate and a valve seat to seal the valve, and is prevented from slipping out of alignment with the seat by cylindrical or conical guide structure.

Abstract: A steam aperture device in a mold for use in preparing a foamed article. The steam aperture device comprises an aperture member extending therethrough and a moving member movably inserted in the aperture member. The aperture member forms a truncated conical wall progressively enlarged toward the end on one side and a cylindrical wall on the other side, both walls having a common axis. The moving member has a truncated conical surface corresponding to the truncated conical wall and a cylindrical surface, the moving member forming a gap between the truncated conical surface and the truncated conical wall when the moving member is raised from the aperture member. A steam passage is formed in at least one of the aperture member and the moving member, one end of the steam passage being opened on the other side and the other end of the steam passage communicating with the gap formed when the moving member is raised.

Abstract: The specification discloses a fire hydrant and valve assembly therefor including a flexible, resilient compressible, fluid-impervious sealing flange or lip formed on and extending outwardly of the main valve sealing member for supplemental sealing of both the water passageway through the main valve seat ring and between the valve seat ring and inner surface of the hydrant conduit.Also disclosed is a method for assembling a valve assembly in a fire hydrant to prevent damage to the valve assembly by using the sealing flange or lip on the sealing member to locate and guide the valve assembly through the valve seat area of the conduit as well as to lubricate that area during insertion of the valve to ease assembly and facilitate later disassembly.

Abstract: A linearly displaceable poppet controls the flow of fluid through a valve. The poppet has an external annular channel to communicate an inlet and an outlet port of the valve. Abutting poppet sleeves define a dovetailed groove of restricted volume, the sides of which extrude a Teflon O-ring into the path of a shoulder of the wall defining the channel to close the valve. The extruded section is on the high pressure side of the poppet and is backed by the shoulder and an adjacent poppet sleeve. The seat and seal thus defined are spaced from the channel outlet to the outlet port to avoid erosion from throttling.

Abstract: A closure head of a plumbing valve engages a protruding bead formed around one opening of a hollow highly flexible sealing member. Supply fluid is conducted to the interior of the sealing member through another opening. The hollow sealing member provides a flexible lip surrounding the bead, the lip responding to pressure of the supply to urge the bead firmly into engagement with the closure head. The lip deflects upon engagement with the closure head and its inner side is free of restraints that would prevent deflection. Limits are placed upon movement of the head while no effective limits are placed upon deflection of the lip. A lip around the supply port to the sealing member also effects a static seal. The sealing member is snap fitted into the bottom of a removable cage.

Abstract: A two-piece valve including a first tubular member having a flow passageway therethrough with a tapered valve seat formed at one end of the flow passageway. A second tubular member is provided having a flow passageway therethrough and a valve element mounted in the flow passageway on the axis thereof. The first and second tubular members are slidably telescopically engaged with each other with one end of the first tubular member slidably positioned inside one end of the second tubular member. The valve element of said second tubular member has a tapered valve surface formed thereon adapted to move into and out of sealing engagement with the tapered valve seat of the first tubular member when the tubular members are telescoped axially one inside the other. The taper angles of the valve element and seat are in the "self-holding" category so that when the valve element is firmly seated in the valve seat the parts will be retained in mating engagement without any additional retaining means.

Abstract: A valve seat cleaning device utilizing a valve head of resilient material in the shape of a frustum of a cone. A flexible circular disk is positioned against that end of the valve head of lesser diameter. The circular disk is of somewhat greater diameter than that end of the valve head so that it may perform a wiping action to wipe away dirt particles from the valve seat.

Abstract: A shut-off valve may control the flow of high-pressure fluid in an on or off manner. The valve includes a valve housing having an axial bore therethrough with a valve member slidable therein. The valve member is formed with a hemispherical poppet which, in one position, is seated between a valve inlet port and a valve outlet port. The valve member is floatably mounted within the axial bore so as to render the hemispherical poppet self-aligning with respect to the valve seat. The valve is remotely actuated by a valve actuating fluid.

Abstract: A valve seat and/or co-operating disc has an indented or zigzag perimeter. The disc is integral with the valve body and surrounds a body aperture through which a sealed valve stem reciprocates.

Abstract: A valve assembly especially adapted for use with very high pressure reciprocating pumps. The main components are coaxially aligned. A main high pressure passage extends through the center of the assembly and has check valves at opposite ends thereof. One of the check valves has an annular valve element comprising inner and outer sleeves which fit against one another with an interference fit. This annular valve element seats against a matching annular inlet passage.

Abstract: A thermostatically operated valve construction for an engine coolant system and having a tubular sleeve valve member for opening and closing an annular valve seat of the construction at one end of the tubular sleeve valve member that is interconnected to a temperature responsive device, the sleeve valve member having a part thereof projecting from the one end thereof into and closely adjacent the annular valve seat when the sleeve valve member is between a closed position and a partially opened position to thereby meter the flow through the valve seat during a substantial portion of the initial opening movement of the sleeve valve member.

Abstract: A valve comprising a body having a straight-through flow passage, a valve head moveable at an acute angle with the downstream end of the passage into and out of the passage, and a valve seat extending about the passage for cooperation with the valve head to adjust the valve over a range from the wide-open to the closed condition, the valve seat approaching the axis of the passage no more closely than does the wall of the narrowest portion of the passage upstream or downstream of the seat, whereby in the wide-open condition, the valve head is removed from the passage, the axis of the passage remains a straight line, and the cross-sectional area of the passage at the position of the seat is no less than it is at the narrowest portion of the passage upstream or downstream of the seat.

Abstract: A fuel control device having a passage therethrough for interconnecting a fuel source with a main burner and having a poppet valve arrangement that is directly manually operated for opening and closing the passage so as to control the flow of fuel from the source to the main burner, the poppet valve arrangement having a poppet valve member that is moved relative to its valve seat upon the manual manipulation of a selector of the control device. The poppet valve member can work with the pressure of the fuel from the source thereof when the poppet valve member is being moved to its closed position.

Abstract: A respirator or gas mask has a check valve having a seat with a raised border. A soft rubber valve is located on the seat and held thereto by a valve retainer. When the valve is not under any pressure, the valve is sealed solely by contact between the rim of the valve and the raised portion of the seat. When back-pressure is placed on the valve, it seats on the entire valve seat area.

Abstract: A flow passage providing improved pressure recovery in a valve having an axially movable closure element which includes the provision of an annular diffuser flow passage from the seat port to the periphery of the closure member to reduce the fluid pressure drop across the valve when the closure member is moved a limited distance to its fully open position. The annular diffuser flow passage is provided between a pair of oppositely disposed frusto-conical surfaces respectively provided on the valve body and the closure element. The closure member may also be provided with a convexly shaped projection and the valve flow passage shaped to further reduce the pressure drop across the valve.

Abstract: A valve which comprises components which can be assembled and disassembled by hand and which can discharge a relatively large volume of hot water in a few seconds.

Abstract: A throttling valve which includes a stem having a shoulder thereon. The lower end of the valve stem extends into a valve seat. The stem includes a shoulder which forces the seat downwardly. The seat mechanism incorporates a seal which encircles the stem. The shoulder on the stem engages a wedge-shaped member driven into a softer member, causing radial expansion to tighten snugly about the stem. A fixed seat member is also incorporated. This enables throttling without erosion of the components when the flow is cut to a trickle, particularly in high pressure circumstances.

Abstract: An isolating valve or damper for the gas-tight closure of a flue or duct, comprising a frame or housing fitted in the flue or duct and a closure member operable between an open position and a closed position in which the member closes the flue or duct, wherein the closure member is a lightweight low inertia body, preferably a cone or a sphere, and wherein the closure member may be moved between its open and closed positions by means of a rapid-acting operator.

Abstract: A sealing system for a shutoff element having two substantially ring-shaped sealing elements forming at least two substantially ring-shaped sealing lines. A given one of the sealing elements is constructed as a thin-wall body which is elastically deformable under the action of a closing force. The given sealing element, in the closed position of the shutoff element, under deformation of its wall bearing against the other sealing element at least at two ring regions with line contact. Means define free deformation spaces for the wall of the thin-wall body beneath said ring regions, and means define a respective support adjacent said deformation spaces and extending substantially parallel to the ring regions and against which bears said wall.