Abstract: A diaphragm valve including a main valve body and a ring member welded to the main valve body, and a flexible diaphragm having an outer periphery welded to the ring member. The weldment between the main valve body, the ring member, and the diaphragm, provide a hermetic seal for the chamber cavity of the diaphragm valve. The diaphragm may include an inner periphery welded to an axially movable valve member, also for providing a hermetic seal of the chamber cavity. In other embodiments, the outer periphery of the diaphragm is clamped to seal the chamber cavity by a bonnet being welded to the valve body.A seal arrangement includes a groove provided in a surface surrounding a port, and an elastic sealing material disposed in the groove.

Abstract: A dual plate check valve comprises a substantially cylindrical valve body 10 provided with a diametrical cross-member 14 thereby defining a pair of substantially D-shaped apertures, and two substantially D-shaped plates 18, pivotally connected by a hinge means 20 parallel to said cross-member 14, and pivotable between a valve open position and a valve closed position in which the sealing face of each plate engages a sealing face provided on a valve seat 16 which surrounds each aperture. A groove is provided in each sealing face which is then filled with a weld inlay 40, 42 and then machined to provide a sealing face portion of a more durable metal alloy.

Abstract: A valve seat insert for use in forming a metallurgically bonded valve seat for a light alloy casting. The valve seat insert is comprised of a base formed from a sintered material selected from the group of ferrous, copper or nickel and is provided with a coating selected from the group of copper, tin, zinc, silicon, aluminum or silver or an alloy thereof. The coating forms an eutectic alloy with the aluminum of the cylinder head which eutectic alloy has a melting point lower than that of either the aluminum or the coating.

Abstract: Imperviousness system composed of a metallic toric joint (9) compressed between two bearings (27, 28) which together form an acute angle (.alpha.) so as to produce a sliding and polishing of the skin of the joint and reduce the local levellings which would compromise the imperviousness capacity of the joint on each closing operation.

Abstract: A device for draining oil out of a valve spool cap is disclosed. The device makes the oil start to drain out of the spool cap just after the valve spool starts to move thereby remarkably improving the responsibility of the spool. The valve body has either an enlarged inner diameter portion formed in the bore or a drain hole extending in the body for making the drain core communicate with the inside of the spool cap. The enlarged inner diameter portion is formed by partially enlarging the inner diameter of the bore between the drain core and the end wall of the valve body. The drain hole extends in the valve body from the drain core to the end wall of the valve body.

Abstract: A fluid coupler connectable with a fitting of a variety which extends from an externally-threaded forward coupling end to a rearward port end. The coupler includes a body having an internal fluid passageway and valve stem. A distal end of the valve stem has a forward surface defining a seating portion, and a rearward surface engageable with a poppet valve of the fitting. A valve sleeve is received coaxially over the valve stem to define a fluid flow path therebetween. A rearward second end of the valve sleeve defines an outer periphery and an inner periphery configured to be received within the seating portion of the valve stem, and has a rearward confrontation surface with a seal member rotatably received within a mounting groove thereof. The valve sleeve is biased in a rearward first position wherein the second end thereof is received within the seating portion of the valve stem closing the fluid flow path, and is movable to a forward second position opening the fluid flow path.

Abstract: A valve of the membrane valve type comprises a valve body with two fluid flow channels (5, 5') separated by a land portion which forms a valve seat (6) having a sealing surface for co-operation with a flexible membrane (7) mounted over a duct (8) which opens in front of the valve seat and is arranged for fluid pressure actuation of the membrane between a closing position, where the membrane (7) sealingly contacts the valve seat (6), and an opening position where there is a flow channel communicating space ( 11) between the valve seat (6) and the membrane (7).

Abstract: A stop valve which is in particular constructed as a valve top for a sanitary fitting, contains an actuating member constructed as a rotary spindle. The actuating member, which is held in axially non-displaceable manner, engages with a hexagonal neck in a closing body, whose external thread engages in an internal thread of the valve top. The closing body has a closing face cooperating with a valve seat. The valve seat is displaceable to a limited extent in the axial direction and contains a rubber-elastic member.

Abstract: A fluid flow controller and meter including a metering tube with a bore formed axially therein having a slit-like orifice axially disposed and intersecting the bore along the length thereof. Flow through the meter is controlled by a valve member which moves in the passage of the metering tube and across the slit-like orifice. In a preferred embodiment, the slit-like orifice is in fluid communication with a site tube which contains a flow sensitive element which is responsive to the flow induced. The slit-like orifice achieves a linear flow response to changes in the relative position of the valve member.

Abstract: A poppet seat for air regulating devices, such as underwater diving equipment, includes a metal or plastic substrate around and through which synthetic or rubber seat material is molded. In its preferred form, this seat material surrounds the sides of the substrate and fills holes therein as well as an annular v-groove formed in the periphery of the substrate to further enhance the mechanical bond between the substrate and seat material.

Abstract: A diaphragm valve structure which is durable and has high reliability is obtained.In the diaphragm valve structure, a body 11, a valve seat 12, a seat holder 13, and a diaphragm 14, are provided; an inflow passage and an outflow passage for fluids and openings thereof are formed in body 11, valve seat 12 is disposed around the periphery of the opening of the inflow passage, the valve seat is pressed downward into body 11 by seat holder 13, diaphragm 14 comes into contact with valve seat 12 and places the opening in an airtight state, and thereby, movement of fluid between the inflow passage and the outflow passage is halted. At least two projecting parts are formed between the inflow passage and the outflow passage of this diaphragm valve structure; one of these two projecting parts is formed on valve seat 12, and the other projecting part is formed either on valve seat 12 or on seat holder 13.

Abstract: A valve seat retainer is formed having a flange that extends over the valve seat and that applies both a radial and a longitudinal force to the valve seat. The flange extends an order of magnitude further than typical prior art valve seat retaining flanges. The flange is created by a rolling method with a roller having a unique surface profile. The roller surface has a pair of spaced ridges with a groove in between, and a curved convex surface adjacent to one of the ridges. When a downward force is applied to the roller, the curved surface on the roller causes the roller to move radially inward while at the same time material from the upper surface of the engine block is disposed in the groove and is moved to create the flange.

Abstract: In the bulk material container having a bottom outlet valve, a valve seat (2) having a conically shaped feed side (25) is arranged in a conductor tube (1) which is attached at the bottom outlet of the container (24). On the outlet side, on the valve seat is supported a dished valve disk (3), which projects by its dishing into the opening of the valve seat (2) and which has a guide pin (4) on its hollow side. The guide pin is mounted to be able to slide in a guide sleeve (6) arranged in the conductor tube (1) and is connected to an actuating device.

Abstract: A valve comprises a valve seat member and a movable valve member (preferably a disc with at least one face coated with piezo electric material) movable towards and away from the seat to close and open the valve and a sealing element made from a resilient material and attached to one of the members. The sealing element possesses an initial deformable characteristic so that initial closure of the valve causes the seating element to substantially conform to the shape of the other member and retain the so-conformed shape. The sealing element comprises first and second springs of different resiliently formable characteristics, the second spring preferably being a ring of elastomeric material, and the first spring--after initial deformation of the sealing element--being rigidly adhesively secured to the valve seat member.

Abstract: A valve seat member in a gate valve has a circular or crescent shaped slot cut on the inside diameter parallel to and underneath the seat surface to create a seat with increased flexibility at areas on the seat surface where high compressive stress during valve operation is observed. As a result galling of the gate is reduced, and valve reliability and life are increased.

Abstract: A fluid connection includes a valve which blocks flow into or out of the housing until a tube is fully received within the housing. The valve preferably has structure which is biased against the valve seat in the housing until the tube is moved into the housing. The valve seat is preferably in a plane which is perpendicular to the central axis of the housing. Further, the valve preferably has surfaces which guide fluid between the radially outer surface of the valve and the interior of the tube. In one embodiment, the valve includes a forward ring which contacts a tube and which has two ribs connected to the main valve body. The valve surface is preferably a conical surface spaced axially inwardly from the forward ring. Preferably, additional conical surfaces are disposed between the ribs and guide the fluid between the valve surface and the interior of the tube. In another embodiment, the valve may have an X or Y-shaped cross-sectional ribs which contact the tube.

Abstract: A valve is provided with an orifice member that is forcibly inserted into an opening of the valve body and the opening in the valve body is provided with a plurality of protrusions, or ribs, which are shaped and sized to deform in a particular manner during the insertion of the orifice member. The protrusions, or ribs, extend radially inward from the inner cylindrical surface of the opening in the valve body. The deformation of the ribs during the insertion of the orifice member provides sealing at the interface between the orifice member and the valve body and, in addition, rigidly holds the orifice member at a predefined position relative to the valve body and permits this position to accurately determined by using a datum surface during the assembly process.

Abstract: An improved metal diaphragm valve is disclosed, in which the bed of the valve casing is made wider in its surface where the valve seat is mounted, than in conventional valves. The sufficiently spacious bed surface enables polishing easier, particularly in assembling micronized sizes of a valve. The simple design also makes it possible to use multiple-stage electropolishing, a technology used to obtain a mirror-like surface of casing bed. Since the bed of the valve casing has a wide enough space between the inner casing wall and the annular valve seat, the likelihood of fluid stagnation is lessened, causing fluid to flow smoothly from the inlet to outlet passage. The widened casing bed surface design is obtained because the annular valve seat caulked in position by expanding the rim of the inlet port in the fluid entrance passage that is bored concentrically of the central annular seat.

Abstract: An improved valve of the flapper plate type is disclosed, the valve comprising at least one flexible member for connecting the flapper plate and the arm actuating the flapper. The flexible member absorbs impact energy and allows restricted three dimensional movement of the flapper plate. The seals for the flapper plate and the seat comprise electrically conductive sealing materials.

Abstract: The invention is directed to a membrane carburetor for an internal combustion engine such as a two-stroke engine having an intake for drawing the mixture in by suction. The membrane carburetor has a venturi section wherein the mixture is formed. A main nozzle opening opens forward of a throttle flap and an idle nozzle opening opens rearward of the throttle flap both viewed in flow direction. Both openings are connected via channels to a fuel-filled control chamber to which fuel flows via an inflow channel. An inlet valve is mounted in the inflow channel and has a valve body disposed opposite a valve seat fixed in the housing. The inlet valve is actuated in the opening direction via a control lever by a control membrane delimiting the control chamber.

Abstract: A valve is disclosed for selectively permitting passage of fluid media such as gaseous fuel, from a first location to a second location. A valve body has one end portion defining a cylindrical inner wall surface and a flat annular seat extending inwardly thereof. An end plug is positioned for axial movement toward and away from the valve seat and an annular seal ring is positioned between the end plug and the valve seat and adapted to provide gaseous sealing contact between the end plug and the valve body at a plurality of locations when the end plug is moved to a first closed position which prevents gaseous communication between the first and second locations. In one embodiment the seal ring moves axially with the end plug and in another embodiment the seal ring remains seated and the end plug moves in the axial direction away from the seal ring. Other embodiments provide alternative means to direct the gaseous media from the first location to the second.

Abstract: Lead-in of a valve seat member being pressed into a valve body bore has larger angle initial lead-in portion followed by smaller angle transition lead-in portion leading to press-fit outside diameter. This prevents a maximally misaligned valve seat member from shaving a silver as the lead-in passes across the shoulder of a counterbore at the entrance of the press-fit inside diameter of the bore.

Abstract: A fuel injection valve and method in which a valve part consisting of a valve seat body and a support body with injection holes is pushed into a longitudinal orifice of a housing and firmly connected to a wall of the housing with the insertion depth determining the presetting of a valve needle lift. The precise setting of the valve needle lift is made on a fully assembled valve by deforming the valve part between fixing areas of the support body. The injection valve and the method of manufacture of the injection valve are particularly suitable for fuel injection units of mixture compressing engines with externally supplied ignition.

Abstract: An adjustable vibration damper for motor vehicles has a cylinder containing a damping fluid, an axially-movable piston rod projecting into the cylinder in a sealed manner, and a damping piston fastened to the piston rod to divide the cylinder into two work chambers, whereby a damping valve equipped with an axially movable valve body and a valve seat controls the effective cross section of a damping passage. For this purpose, the valve body, starting from its pressurized end surface, has at least one constant throttle cross section running toward the back side of the valve body, and an additional throttle passage running in the outflow direction, whereby a pilot control element for regulating flow through the additional throttle passage is located in a recess inside the valve body.

Abstract: An improved valve seat which significantly decreases the impact stress caused by the impact of a mud pump valve body against the valve seat. The valve seat comprises a generally cylindrical body portion with a sealing surface which is sloped from the outer surface of the cylindrical body portion toward an interior throat of said cylindrical body portion. The valve body comprises a generally disc-shaped portion and a truncated conical portion. An elastomer insert is received in a groove in the valve body. The conical portion of the valve comprises a sloped face, including a metal portion and an elastomeric portion formed by the elastomeric insert. In the valve seat of the present invention, an annular pressure relief groove in the cylindrical body portion of the valve seat allows the sloped face of the valve seat to flex thereby relieving a significant amount of the impact load between the opposing face of the valve assembly.

Abstract: The present inventive relates to a master cylinder (1 ) with elastomeric central valves (20) which can be opened in opposition to a relatively high pressure in the pressure chambers (8 and 9) without damage. The sealing face (29) of the valve member (26) is in the form of a hollow cylinder protruding slightly from the broad head portion (24) of the valve pin (21). The valve member sealing face does not, as has been conventional practice, extend radially inwardly past the head portion (24) in the direction of the central bore (13) to avoid being drawn into the bore (13).

Abstract: A control valve for fluid media has an adjusting piston which is displaceable by a drive and whose face end can be seated against a valve seat. The adjusting piston and the drive are disposed in a valve housing which is completely filled with fluid. The adjusting piston is formed by a hollow body through which fluid can flow on both sides in the direction of its axis, and the hollow body surrounds a cavity. The cavity is sealed by a first sealing member extending transversely of its axis against the valve housing, and by a second sealing member which extends against a dividing wall which is contained in the cavity and is displaceable in a direction of the axis. The valve housing is filled on one side of the first and second sealing member facing away from the valve seat with an incompressible hydraulic protective fluid.

Abstract: A saw-tooth shaped groove around the outside of a valve seat cooperates with the wall of a bore into which the valve seat is pressed to capture material displaced from the wall of the bore during the step of pressing the valve seat into the bore.

Abstract: A fluid flow control valve is provided with a seal comprising a thin metallic film backed by a resiliently deformable body. The seal is mounted on a closure part which may be either the valve stem or the valve seat. The thin film and deformable body are deformed so as to conform to the surface the metallic film seals against as the valve is closed. As the valve is opened, the deformable body returns to its initial state thus returning the thin film to its initial state.

Abstract: A piston type of shut-off valve with a sealing ring made of expanded graphite. A plurality of ring-shaped lamellae are each stamped from a foil of expanded graphite and then joined to form a sealing ring. A peripheral edge surface of the sealing ring, rather than its planar facing surface, comes into sealing contact with the piston thereby improving its service life. Service life of the sealing ring can be further improved by using a guard ring on a facing surface of the sealing ring as well as by using an installed density for the sealing ring of 1.5 to 2.2 g/cm.sup.3.

Abstract: A valve seat for a valve used with a treater tank comprising a body having a generally cylindrical bore therethrough, the body having a first end, a second end and being made of metal, the first end having a counterbore concentric with the cylindrical bore, the body having means on the second end for mounting the valve seat in the valve and an insert carried by the body and received in the first end, the insert being comprised of an erosion-resistant synthetic polymeric material having a cylindrical passageway therethrough, the insert having a first portion defining first inner and outer concentric cylindrical surfaces, the first outer surface having a diameter greater than the diameter of the counterbore, an annular sealing surface being formed on the first portion, and a second, generally cylindrical portion, said second portion being received in the counterbore and means disposed between the body and the second portion to secure the insert to the body and effect fluid-tight sealing between said insert and

Abstract: A valve comprises a valve member engageable with a valve seat provided in a valve body, an annular seal slidably supported on the valve member or adjacent the valve seat and having an axial end face which is sealing engageable with the valve seat or valve member respectively on engagement of the valve member with the valve seat, the axial end face providing at least some of the sealing between the valve member and valve seat. In use the differential in pressure existing between the upstream side of the valve member, and thus closed space, and the downstream side of the valve member when the valve is closed produces an axial force on the seal to drive it axially into sealing engagement with the valve seat or valve member respectively. Any wear of the axial end face of the seal is accommodated by such axial movement.

Abstract: A slurry filter apparatus in which a pump mechanism having a valve and a valve seat, each of which is made of a wear-resisting metal material, is capable of moving a slurry of high density and containing hard particles, under pressure, the flow of slurry being injected so as to strike the face of the filter at an a predetermined, non-tangential angle. Coarse particles contained in the slurry are uniformly dispersed by the shearing forces due to cavitation generated through the high pressure injection of the slurry and abrupt speed changes of the flow of slurry. A caked layer of particular material is thereby prevented from forming on the surface of the filter.

Abstract: An overload detection device (100) adapted for mounting between the end of a robot arm (104) and tooling (106) employs an interlocking pneumatic chamber subassembly (1) and a stemmed plate (2) pneumatically secured in a unique "engaging registration" relationship under normal loading conditions. An annular metal bearing member (16) fixed to the chamber subassembly (1) has an elevated sealing surace (56) which provides an airtight seal only when the components are in engaging registration. An excessive load upsets the engaging registration relationship allowing air to immediately escape and the normally rigid coupling provided by the overload detection device (100) to become compliant. The reduction in pressure is concurrently sensed by a specially designed, externally mounted removable pressure sensor (3). The pressure sensor (3) includes a small snap-acting electrical switch (24) which is actuated by a loose fitting unsealed piston (27).

Abstract: A gate valve assembly has two aligned and connected body housing members which each have a gate slot above a through passage which is above a seat portion slot. Gaskets are compressed by the body housing members to form a liquid-tight seal along the valve sides. Two resilient valve liners are fitted between and compressed by the body housing members. Each valve liner has a body with a planar front face and a cylindrical through passage which extends through the liner body. A seat portion extends downwardly from the body of each liner and increases in thickness as it extends from the body. The valve liners are compressed within the body housing members such that the planar front faces are adjacent one another and the seat portions are compressed within the seat portion slots to produce a tight seal along the bottom of the valve assembly. A packing filled chamber at the top of the assembly forms a tight seal at the top of the valve.

Abstract: A valve sleeve is fitted around valve rotor to define a rotary valve. The valve sleeve is characterized by the configuration of axially extending grooves which are formed in its internal surface. Specifically, the axial groove has a bottom surface which includes a lengthwise portion having a constant depth. The bottom surface of the groove is connected to the wall surfaces which are located at the opposite lengthwise ends as well as with the opposite lateral side walls by arcuate surfaces. At least one of the wall surfaces which are located at the lengthwise ends has an angle of inclination which exceeds 60.degree..

Abstract: A check valve assembly is disclosed which is inserted in a fluid flow conduit leading from a source of fluid flow to a mechanism utilizing the fluid flow. The check valve assembly comprises a housing having an inlet port and an outlet port that communicate with a central chamber in the housing, and a valve disposed in the central chamber adapted to permit fluid flow from the inlet port through the chamber to the outlet port and prevent fluid flow from the outlet port through the chamber to the inlet port. The housing comprises a first attachment piece associated with the inlet port and adapted to be attached to the fluid flow conduit leading from the source of fluid flow, and a second attachment piece associated with the outlet port and adapted to be attached to one of several adapter elements. Various types of adapter elements are disclosed which include sections for connecting the adapter element to the second attachment piece and to the fluid flow conduit leading to the mechanism utilizing the fluid flow.

Abstract: A solenoid valve comprising a valve body, and a poppet vertically slidable within the valve body and moved to and from a valve seat so as to open and close an oil passage. The poppet is in the form of a cylindrical tube and is slidably fit around and supported by a guide rod in an oil-tight manner. The guide rod has a valve seat at its bottom and an oil passage for communication with the interior of the poppet. Features of the present invention are as follows. The guide rod has a surface on which the inner peripheral surface of the poppet is slidable. The outer diameter of such a surface of the guide rod is slightly smaller than that of the valve seat. In this way, the solenoid valve acts as an on-off valve and a relief valve. The valve of the type as thus far explained further includes a passage for reducing the flow velocity of an oil as pressurized between the poppet and the guide rod. A surface of the poppet is shaped to maintain an oil film between the poppet and the valve seat.

Abstract: A direct-operated, two-way solenoid valve is disclosed. The valve balances the hydraulic flow forces acting on a poppet in order to achieve fast-acting, high-flow operation. The valve has a housing with the poppet mounted in a main bore. The poppet has a sealing end with a longitudinal central bore that is open at the sealing end and terminates in a pressure wall. A radial cross bore in the poppet provides fluid communication between the central bore and an outlet port formed in the housing. The sealing end of the poppet may contact a valve seat to prevent fluid communication between an inlet port formed in the housing and the central bore of the poppet. The sealing end of the poppet is biased into contact with the valve seat to prevent fluid communication between the inlet port and the central bore. An actuator generating a magnetic flux path tends to move the poppet out of contact with the valve seat.

Abstract: A latching trip valve for opening and closing a safety device. The trip valve is operable manually and from the pressure of a pilot circuit which monitors the operating conditions of a pipeline. A floating seat is movable under the influence of a longitudinal movable poppet and its included seal means. The floating seat and seal means forms a closed passage until the pressure of the pilot circuit decreases whereas the passage is opened.

Abstract: A metering valve, simultaneously controlling a plurality of flow paths with a single poppet movable into and out of engagement with a valve seat in a duty cycle operation has the sealing surfaces of the poppet and seat formed with an accurately flat surface finish to minimize leakage when the valve is closed. The seat surface is formed with recessed areas to reduce the area of contact with the poppet surface to reduce pull-off force while maintaining adequate contact area to dissipate the closing impact forces which are further minimized by controlling the flow of fluid from between the opposed surfaces during valve closure.

Abstract: Disclosed is a micro gas flow rate control valve which is used in semi-conductor producing system operated under a high vacuum or various apparatus for analysis. The valve uses combination of a flat surface valve tip and a flat surface valve seat of cylindrical shape, and is capable of controlling minute flow and durable even used under severe conditions of high pressure differences and large temperature changes to have stable performance. Also enclosed is a metal-ceramics sealing mechanism suitable for the above valve. The sealing mechanism uses, in addition to a sealing member made of a soft metal, a seal assisting member, and durable under the conditions of repeated temperature changes.

Abstract: The edges of the port exits of a poppet valve seat member are each provided with a 30 degree chamfer and a counter-bore immediately upstream of the chamfer to significantly reduce exit flow losses. The depth/width of the counter-bore is between about 2:1 and about 3:1.

Abstract: In a high temperature seal between a closure member and a rim with interengaging hard metal rings, the ring on the rim rests on a conical shoulder and the underside of the ring is complimentary shaped, so that as the shoulder expands circumferentially the ring slides down the conical surface and remains bedded on the shoulder.

Abstract: A packingless gate valve is disclosed which includes a housing having opposed similar housing halves with pipe nipples extending therefrom and with resilient sleeve units installed on respective lock rings mounted in recessed portions of the housing halves. The sleeves act to compressibly engage each other in the valve open condition and engage opposite sides of the gate in the valve closed condition. Each sleeve unit has a radially outwardly extending flange on the inner and outer axial ends with these flanges being located in indented regions between each lock ring and the respective housing half. An encircling thin stiffening ring of harder material is bonded to the axially outer surface of the flange on the inner end of each sleeve, each stiffening ring being shaped with a right angle bend so as to provide both axially and radially facing surfaces for each sleeve body. Each stiffening ring is engaged with the respective lock ring along the entire length of the stiffening ring.

Abstract: The present invention relates to an arrangement (1) for a valve assembly which acts with a movable valve body (4), such as a piston, for the purpose of feeding a liquid in a liquid jet printer, the valve assembly including a valve seat (5) which extends around a liquid discharge opening (6) and interacts with said valve body to form a seal. The invention permits, amongst other things, the simple production of components parts of the valve assembly, and also permits the accurate feeding of liquid from the liquid jet printer. Said valve seat (5) is made of a flexible material (5A) capable of interacting with the moving valve body (4).

Abstract: A segmented ball valve has a rotatably mounted segmented ball valve element positioned to rotate eccentrically in a valve body with respect to three valve body sealing elements about the sealing opening for the valve body. The sealing elements include a compression seal of a flexible sealing element operative at one angular closure position of the ball valve element, a metal-to-metal seal with a flexible metal element operative in a second angular closure position and a metal-to-metal compression seal operative in a third angular closure position.

Abstract: A thermally activated snap-action valve includes a valve body having an interior cavity and inlet and outlet passages formed therein and a bimetallic disc, a ball element, and a resilient positioning plate in the cavity. The positioning plate is operative for normally positioning the ball element in inwardly spaced relation to a valve seat at the inner end of the outlet passage, and the bimetallic disc is mounted in the cavity so that the pressures in a fluid passing through the valve are substantially equal on opposite sides of the bimetallic disc. The bimetallic disc is operative with a flexing action in response to a predetermined temperature condition for moving the ball element to a closed position wherein it is received in the valve seat to obstruct the outward flow of fluid through the outlet passage.

Abstract: A raised hardface overlay valve seat, fused around the periphery of the port of a valve, having an inverted frustoconical body cavity and an inverted frustoconical plug inserted into said cavity in sealing engagement therewith. A major advantage of the raised hardface overlay seat is that it has a taper conforming to the taper of the plug and as a consequence, reduces the area in contact with the plug and effectively intensifies the sealing stress that can be generated between the plug and the seats by a downward force. The plug may be used with lapping compound to lap the seats, both prior to service and in the field. Sufficient space is allowed in the cavity for a substantial relap life.

Abstract: A valve seat insert for use in a cylinder head a a piston engine including a ceramic member having a valve seat surface and a metallic member integrally combined on the outer periphery of the ceramic member. The metallic member is made of a metallic material having a coefficient of thermal expansion the same as or higher than that of the ceramic member and lower than that of the material of the cylinder head. The valve seat insert has not only high wear resistivity, heat shock resistivity and heat resistivity, but also easy productivity and reliability for use and further possible to be handled and fitted into the cylinder head easily. A cylinder head for piston engine has the above valve seat incorporated therein.