Abstract: A valve seat for use in a high pressure pump comprises an inner portion force fit within an outer portion. The outer portion has a fluid plenum at an outer peripheral surface. Fluid passages extend radially inwardly to communicate with a valve recess in the inner portion. A seal housing for a high pressure pump comprises an outer portion and an inner portion. The inner portion is force fit within the outer portion. The inner portion has an inner bore having a first location to receive seal packings, and a second location to receive valve spring structure. The inner portion has a curved surface that bottoms out against a curved surface within the outer portion.

Abstract: The present invention provides a spool seat with a positioning structure, which resolves the shortcomings of the assembly of a typical spool ceramic disc and spool seat. The spool seat of the present invention is provided with a chamber space for locating the fixed ceramic disc. The chamber space is provided with an internal locating portion which comprises an internal locating flange and external locating flange. An external locating portion is protruded from the chamber space. The chamber space is divided into inlet space and outlet space via the arrangement of internal locating portion. It is possible to eliminate the space restrictions for the fixed ceramic disc, and also prevent the rotation and slide or displacement when the fixed ceramic disc is assembled into the chamber space of the spool seat.

Abstract: An exhaust gas valve assembly includes a housing defining a cavity therein and having an intake port and an exhaust port. A valve seat has a first axial end secured to the housing and a second axial end that is disposed within but decoupled a distance from the housing. The second axial end defines one or more apertures that provide fluid communication between the intake and exhaust ports. A seal is disposed between the second axial end of the valve seat and the housing so as to close the decoupled distance therebetween. A piston is received within and is axially movable relative to the valve seat so as to open and close the one or more apertures and thereby regulate exhaust gas flow between the intake and exhaust ports.

Abstract: A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided.

Abstract: A ball valve comprising: a valve body with a seat for housing a ball provided with a coaxial through-opening and able to be rotationally operated from a closed valve position into an open valve position and vice versa; two opposite end flanges which are constrained to the valve body on opposite sides of the ball and provided with a respective, coaxial, internal hole and are suitable for connection to respective pipe sections; sealing means arranged between the valve body and the ball and comprising an annular member which is coaxial with the longitudinal axis (X-X) and carries an axial seal housed inside an associated axial seat inside which it is partially inserted in order to interfere with the outer surface of the ball, comprising a coaxial ring axially constrained to the annular seal-carrying member and interfering in the transverse direction (Y-Y) with a front surface portion of the seal in order to retain the latter in the axial direction.

Abstract: A valve comprises a housing, an annular housing seat, and a gate. The housing comprises a fluid inlet and a fluid outlet. The housing seat is fixed in position relative to the housing via epoxy. The gate comprises a gate seat and a fluid passageway that extends through the gate. The gate is movable relative to the housing between an open position and a closed position. The gate is also configured to allow fluid to flow from the fluid inlet through the fluid passageway to the fluid outlet when the gate is in the open position, and configured such that the gate seat engages the housing seat in a manner preventing fluid from flowing from the fluid inlet to the fluid outlet when the gate is in the closed position.

Abstract: An improved fuel line connector for connecting a fuel line connection valve to a fuel cylinder outlet valve includes an improved, replaceable tip seal mounted on the tip or nose of the connector valve. The tip seal provides an additional, effective face seal between the connector body and the cylinder outlet valve. The tip seal, being on the fuel line connector, can be maintained and replaced by the party using the vehicle or filling the fuel cylinder.

Abstract: A trim assembly for a control valve includes a seal for sealing a leak path, where the seal is provided to perform advantageously in high-temperature applications, e.g., applications including temperatures of at least 450° F. (232.22° C.). The control valve comprises a valve body and control element. The control element is disposed within the valve body for controlling the flow of fluid therethrough. The trim assembly comprises a valve seat and a retention ring. The valve seat is fixed to the valve body, and the retention ring is threadably connected to the valve seat. The seal can be effected by an annular graphite seal compressed between the trim assembly and the valve body, or by a metal-to-metal contact between the retention ring and the valve body.

Abstract: A water outlet chamber-type regulating device includes a chamber component having an inlet and an outlet for a fluid to be regulated, and including a member for regulating the flow, the member having a valve component translatingly movable and configured to close a passage cross-section between the inlet and the outlet, and is rigidly fixed to a control shaft. The chamber component includes at least one opening formed in its lateral wall, and the control shaft carries a second closing component, which is integral in translation with the shaft and is positioned on the shaft and has a shape that is configured to regulate the flow of water passing through the opening as a function of the regulation of the flow in the region of the passage cross-section.

Abstract: A valve in which durability of a sealing member made from an elastic material can be increased and sealing capability can be advantageously maintained over a wide range from a large differential pressure to a low differential pressure. A valve (100), in which a valve disc (1) and a valve seat (2) are brought into close contact via a sealing member (5) composed of an elastic material and provided at the valve disc (1) or valve seat (2), comprises a throttle section (30) defined by the shape of at least one of the valve disc (1) and valve seat (2). The throttle section (30) narrows a flow passage formed between the valve disc (1) and valve seat (2) and is provided near the sealing member (5). The flow passage narrowed by the throttle section (30) is so set that narrowing preferentially proceeds in the flow passage in close proximity to the sealing member (5) during the closing operation of the valve disc (1).

Abstract: An apparatus and method for a diaphragm valve includes a valve body having a chamber in fluid communication with a first channel and a second channel. A diaphragm is disposed in the chamber, and a tapered seat member is at least partially disposed in the first channel. A sleeve is compressively disposed in the seat member between the seat member and the first channel to maintain a fluid tight seal between the seat member and the first channel. A valve member is movable to controllably urge the diaphragm into and out of engagement with the seat member to control flow of fluid between the first the first and second channel.

Abstract: A seal for a valve for use in a pharmaceutical dispensing device, which seal is formed from a blend comprising: a thermoplastic elastomer including a propylene component with isotactic crystallinity; and a polymer selected from one or more of polypropylene, polyethylene and copolymers thereof.

Abstract: A seal assembly for a fluid pressure control device includes a guide element having a sealing surface and a first guide surface. A throttling element assembly includes a throttling element positionable within a fluid flow path, the assembly defines a mating surface adapted to seal with the sealing surface, and a second guide surface sized to slidingly engage the first guide surface. A relief void is formed in at least one of the guide element and the throttling element assembly adjacent the first and second guide surfaces to receive loose solid material, to thereby prevent disruption of the seal formed between the sealing surface and the mating surface.

Abstract: A gas valve may include a valve body and a valve member disposed within the valve body. A resilient sealing ring may be disposed within the valve body such that the valve member achieves a closed position when the valve member contacts the resilient sealing ring. In some instances, a gas valve may include both an upper resilient sealing ring and a lower resilient sealing ring. The upper resilient sealing ring and the lower resilient sealing ring may both permit overtravel.

Abstract: A valve in which durability of a sealing member made from an elastic material can be increased and sealing capability can be advantageously maintained over a wide range from a large differential pressure to a low differential pressure. A valve (100), in which a valve disc (1) and a valve seat (2) are brought into close contact via a sealing member (5) composed of an elastic material and provided at the valve disc (1) or valve seat (2), comprises a throttle section (30) defined by the shape of at least one of the valve disc (1) and valve seat (2). The throttle section (30) narrows a flow passage formed between the valve disc (1) and valve seat (2) and is provided near the sealing member (5). The flow passage narrowed by the throttle section (30) is so set that narrowing preferentially proceeds in the flow passage in close proximity to the sealing member (5) during the closing operation of the valve disc (1).

Abstract: A self-aligning poppet valve assembly is disclosed. The self-aligning poppet valve assembly is disposed within the inner wall of a conduit and comprises a movable sealing member having a poppet guide, a seat portion comprising an inner receptacle adapted to receive the moveable sealing member, a sealing flange adapted to contact the moveable sealing member, thereby selectively inhibiting fluid flow past the moveable sealing member, and a guide receiving portion coupled the poppet guide, and a sealing device surrounding the seat portion and adapted to maintain a seal between the seat portion and the inner wall of the conduit.

Abstract: A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided.

Abstract: A gate valve includes a valve body having a cylindrical passage defining a flow path through the valve, a gate for controlling fluid flow through the valve and a replaceable wear-resistant flow-path liner for in the flow path. The flow-path liner includes a plurality of replaceable wear-resistant inserts, including wear sleeves lining ports of the valve body, valve seats and a gate insert for a flow path bore through the gate. Each replaceable valve seat has a wiper ring for cleaning the gate when it opens and closes. By regularly inspecting and replacing worn-out inserts, the service life of the gate valve can be prolonged and the expense associated with replacing or rebuilding the valve body is avoided.

Abstract: The valve seat of the present invention is configured for attachment to the valve housing after the valve housing has been coated with a protective coating. The valve seat is configured to grip the valve housing, thereby providing a secure attachment. In its simplest form, the valve seat and the valve housing are both configured with corresponding locking-ring grooves, and a locking-ring element is positioned so as to be at least partially deployed in both the valve seat locking-ring groove and the valve housing locking-ring groove simultaneously. It will be appreciated that the features of the present invention may be used to benefit with substantially any type and style of valve known in the art.

Abstract: A valve seat has an outer surface, a rearward end, a face and a forward end. A passage extends from the rearward end to the face. A valve element slidingly contacts the face. Stress relief flanges are located on the face in areas of high bearing stress. Each flange has a thickness that allows it to deflect slightly to reduce bearing stresses.

Abstract: A valve housing has a bottomed hollow cylindrical main body and a boss projecting from and smaller in diameter than the main body. The main body has a tapered surface circumferentially along a joint where a side wall and a bottom wall of the main body are joined to each other. A plurality of inlet ports are defined in the tapered surface. The boss has an outlet port for discharging a fluid introduced into the main body. When a valve head coupled to the movable member is displaced and a seating ridge of a resilient member mounted on the valve head is seated on a valve seat surface, the inlet ports and the outlet port are brought out of fluid communication with each other.

Abstract: Thin chamber diaphragm-operated fluid handling devices, including thin chamber pumps and thin chamber valves, facilitate device compactness and, in some configurations, self-priming. Diaphragm actuators of the thin chamber devices either comprise or are driven by piezoelectric materials. The thinness of the chamber, in a direction parallel to diaphragm movement, is in some embodiments determined by the size of a perimeter seal member which sits on a floor of a device cavity, and upon which a perimeter (e.g. circumferential or peripheral portion) of the diaphragm actuator sits. The diaphragm actuator is typically retained in a device body between the floor seal member and another seal member between which the perimeter of the actuator is sandwiched. The devices have an input port and an output port.

Abstract: A control valve having a seat ring assembly constructed from a unitary piece of material is disclosed. The seat ring assembly may include a base which serves as a valve seat for the valve plug of the valve, and which includes a plurality of exterior threads adapted to rotatably attach to a plurality of interior threads provided within the valve body. The seat ring assembly may also include a post-guided bearing surface to maintain alignment of the valve plug to the valve seat. The seat ring assembly can be secured to the valve body simply by threadably attaching the elements. Moreover, by providing the valve seat and the guide surface as integral parts of the seat ring assembly, manufacturing costs and maintenance requirements are reduced and subsequent seal leak performance is increased.

Abstract: A pressure control valve for a high-pressure diesel pump of an injection device of a motor vehicle has a valve body and a piezo drive with a tappet securing the valve body in a closed position. The valve body in the closed position closes off a bore, containing a medium under pressure, relative to a pressure-relief bore. The piezo drive has at least one piezo element connected to the tappet. The piezo drive is mounted in a pump housing of the high-pressure diesel pump. A screw element receives the piezo drive and is used to screw the piezo drive into the mounting chamber of the pump housing.

Abstract: A device for securing a sealing member in a predetermined position. The device comprises a positioning element of a predetermined size and shape having a first surface and a second surface, and a retaining element of a predetermined size and shape disposed on at least one of the first surface and second surface of the positioning element.

Abstract: In a proportional solenoid valve, a solenoid main body includes a coil, a valve seat member having a seat portion, a valve element that is displaced in accordance with a current applied to the coil so as to be brought into and out of contact with the seat portion, and a valve guide portion that is arranged coaxially with the seat portion and guides the displacement of the valve element. The housing is attached to the solenoid main body so that a space is formed between the housing and the valve seat member. A seal member made of an elastic material is provided in the space between the housing and the valve seat member.

Abstract: A liquid dispensing device including a body generally having an air passage and a liquid passage. A valve seat is connected to the body and a valve stem is mounted for movement within the body with respect to the valve seat. A piston is caused to move by pressurized air, and is caused by a spring and optionally, air pressure above the piston, to return to its normal position when the air pressure is relieved. The stem is connected to the piston so that it is caused to move linearly to and from the valve seat. The stem is not rigidly connected to the piston, allowing the piston to find its center in the air cylinder and the stem to find its center in the liquid chamber. The piston is mounted with two bearing points so that it is not affected by uneven spring pressure. The stem is located by two bearing points, the adhesive seal and the seat. The air cylinder body and valve body are separated by a large open area.

Abstract: A poppet valve seal mechanism has a groove to which a seal member is mounted such that a width of an opening of the groove is smaller than a maximum width inside of the groove and a cross section area of the groove is smaller than that of the seal member. A maximum width of a portion of the seal member accommodated in the groove is greater than a width of the opening of the groove. A width of the opening is constant over its entire peripheral. An inner wall forming the inside of the groove is formed with communication holes and which bring the inside of the groove and the outside of the groove into communication with each other.

Abstract: Disclosed is a plug and seal assembly comprising an annular seat ring and a plug head for use in a fluid control valve utilized for regulating a flow of high-pressure fluid. The seat ring includes first, second, and third sealing discs alternately stacked with respective first, second and third resilient bearing discs. The inner annular edges of the first, second and third sealing and bearing discs collectively define a conical sealing surface. The plug head defines stepped first, second and third ramps, each ramp having a truncated conical shape of equal half-angle with the conical sealing surface half-angle being larger than the ramp half-angle. The direct engagement of the first, second and third ramps against respective ones of the sealing discs acts to deform the respective ones of the bearing discs to create three fluid-tight seals therebetween to reduce the risk of leakage of the valve when in a closed position.

Abstract: Method and apparatus for configuring a pressure relief valve to have a desired internal orifice size. A population of nominally identical inserts are provided having different internal orifice diameters. A resilient seal ring is placed upon a selected insert and both are inserted into a cup-shaped seat body to form a valve seat assembly. The valve seat assembly is secured within a housing of the pressure relief valve in facing relationship to a moveable piston assembly which is biased against the seal in a normally closed position. When a new internal orifice size is desired, the insert is removed and replaced with a new insert having the new desired orifice size. No changes are necessary in the remaining components. The resilient seal preferably comprises a stiffener ring of rigid material surrounded by an annular ring of resilient material.

Abstract: A repairable pressure relief valve having a valve body that forms an internal fluted surface provides improved field repairability. The internal, fluted surface is adapted to mate with a removal tool. A valve assembly is slidably mounted in the valve housing and slides under excess pressure to vent vapor from a vessel, such as a tank. The valve body has a first seating surface for mating with a second seating surface on the valve assembly when the valve plug is in the closed position. The relief valve has a seal for sealing an interface between the valve plug and the housing and a removable cap mounted proximate to the valve plug for mechanically supporting the seal. The cap can be removed and the seal can be replaced without extensive disassembly of the valve, thereby eliminating the requirement of re-calibration after a repair has been made.

Abstract: A method and apparatus for attaching a valve to another device such as a device, such as a device for separating a solid from a liquid. A valve seat according to the present invention is friction fitted into an orifice defined by the device and a conduit is attached to the valve seat via a removable spline.

Abstract: The invention relates to a valve, comprising a valve body for controlling a medium flowing through the valve, a valve housing (3), in which the valve body (1), which has at least one gasket (4) for sealing cooperation with the valve housing (3) or where appropriate with a cage (5) arranged in the valve housing, is axially displaceable by a spindle (6) in the direction towards and from a valve seating (7) in the valve. The gasket (4) extends peripherally around the circumference of the valve body (1) and is expandable in the radial direction to tight abutment against the valve housing (3) or the cage (5) arranged in the latter through axial pressing of at least one press member (9′) acting on the gasket (4) when the valve body (1) is just before and/or in its closing position.

Abstract: A pressure relief valve has a gasketed main body fastened to a vessel wall adjacent to a vent port, the body having a recess surrounding the port which receives a plastic insert removably coupled to the body by a retaining ring fastened to the main body. The insert defines a passage communicating with the port and a valve seat engageable by a seal assembly for closing the valve. The seal assembly includes an annular retainer for a seal O-ring and a plug receivable through the retainer and into a socket in a valve stem, which is spring-biased against the retainer and is guided in a guide assembly removably mounted on the main body. The insert is formed of plastic and the retainer and plug may also be formed of plastic and can be readily field-removable by simply unbolting the housing from the vessel and unfastening the retaining ring. The guide and bias assemblies need not be disassembled.

Abstract: Threaded seat support for valve with quadruple seal, such as aspiration and exhaust check valves used in reciprocating hydraulic pumps, wherein the threaded seat support cap is comprised by a planar frustoconical metal body, inside which a thread has been made at a central region comprised between the upper mouth forming a larger diameter chamber and a lower cylindrical region, of smaller diameter, defining a planar step adjacent the end of the thread fillet; while the valve body provides the seat at its upper surface, which has a larger diameter forming a projecting peripheral edge, followed by a cylindrical strip of smaller diameter which has a peripheral channel carrying an O-ring; following the cylindrical strip thread fillets are arranged at a smaller diameter region; while that inside the valve body there is an axial drill for a guide rod of the blocking disk of the valve, surrounded by the fluid passage conduits; the bodies of the threaded seat, of the blocking disk and, at least partially, of the guid

Abstract: A method and apparatus for attaching a valve to another device such as a device, such as a device for separating a solid from a liquid. A valve seat according to the present invention is friction fitted into an orifice defined by the device and a conduit is attached to the valve seat via a removable spline.

Abstract: A diaphragm valve assembly comprising a body (2) defining a valve chamber (10) and first and second passageways (8,9) through said body which, in use, serve as an inlet and an outlet for the valve chamber, a removable, annular valve seat (3) adapted to be installed in the valve chamber around one of said passageways (8,9), seat holding means for holding the valve seat in place in the valve chamber, said seat holding means comprising a seat holder (4) that is shaped to surround said valve seat, a flexibly resilient diaphragm (5) having a valve closing portion and means (4,16) for holding the diaphragm in position in the valve chamber, such that said valve closing portion is disposed juxtaposed said valve seat (3), the diaphragm being shaped such that, when fitted, its resilience urges said valve closing portion away from the valve seat (3) and selectively operable driving means (6) for driving the valve closing portion of the diaphragm (5) into contact with the valve seat (3) for closing the valve; characteris

Abstract: Threaded seat support for valve with quadruple seal, such as aspiration and exhaust check valves used in reciprocating hydraulic pumps, wherein the threaded seat support cap is comprised by a planar frustoconical metal body, inside which a thread has been made at a central region comprised between the upper mouth forming a larger diameter chamber and a lower cylindrical region, of smaller diameter, defining a planar step adjacent the end of the thread fillet; while the valve body provides the seat at its upper surface, which has a larger diameter forming a projecting peripheral edge, followed by a cylindrical strip of smaller diameter which has a peripheral channel carrying an O-ring; following the cylindrical strip thread fillets are arranged at a smaller diameter region; while that inside the valve body there is an axial drill for a guide rod of the blocking disk of the valve, surrounded by the fluid passage conduits; the bodies of the threaded seat, of the blocking disk and, at least partially, of the guid

Abstract: A cylindrically curved rectangular face seal is provided for a cross-ported barrel type rotary valve member. The seal has a central flow orifice therethrough with an annular raised rib formed about the orifice and extending in a radial direction from the concave inner face of the seal. The opposite edges of the seal extending in an axial direction each have a notch or rib thereon for axial sliding engagement in grooves provided in the valve body. The annular rib about the orifice accommodates dimensional variation in the valve parts to ensure a rotary sliding seal on the rotary valve member.

Abstract: There is provided a two-port valve which has excellent durability and airtightness and can be easily processed with high accuracy and in which a valve seat can be easily replaced. For this purpose, a valve seat 8 is formed separately from a valve body 4 of a main valve and the valve body 4 is provided with a mounting portion 9 on which the valve seat 8 is seated. The mounting portion 9 is formed of an annular stepped portion including a bottom wall 41 and an outer peripheral wall 42. The bottom wall 41 is provided with a groove portion into which a sealant 44 is mounted and the outer peripheral wall 42 is provided in a vicinity of an upper portion thereof with a groove portion into which a snap ring 47 is mounted. The valve seat 8 is locked in a state in which the valve seat 8 is pressing the sealant 44 and pushed against the bottom wall 41 by the snap ring 47.

Abstract: A valve having a housing and a valve member located in the housing for controlling the flow of a fluid or fluid pressure directed through the housing. The valve further includes a removable valve seat located in the housing and against which the valve member engages and disengages in the fluid or fluid pressure control process. A sealing member is located between an outer surface of such valve seat and an inner surface of the housing of the valve. The removable valve seat being made of a durable molded plastic material.

Abstract: Pick-up tools and other devices for handling semiconductor wafers are require to be capable of withstanding corrosive chemical substances and extreme temperatures, and the valve unit for use in such devices must meet these requirements. The valve unit is also desired to be free from electrostatic charging. To this end, the valve unit comprises a valve main body, having a valve seat defined therein, which is made of relatively electroconductive and self-lubricating material such as PTFE, and a valve case which is injection molded around the valve unit and made of a material having some electroconductivity and a high resistance against deformation such as PEEK mixed with carbon fibers. Provision of annular grooves on the outer surface of the valve main body improves the attachment between the valve main body and the valve case so as to improve both the sealing performance and the mechanical integrity of the valve unit.

Abstract: An expansion valve comprises an orifice formed in a valve body and a valve member fixed to a movable member. Movement of a diaphragm is transmitted to an actuating rod via a member and the actuating rod actuated the movable member to control the opening amount of the path between the valve member and the orifice. An orifice member affixed to the orifice is made of a material harder than the valve body, and free from erosion or other damage by a refrigerant, which will otherwise occur at the valve opening portion.

Abstract: This invention relates to an improved valve which achieves high reliability through a simplicity of design, a minimum number of parts, a unique valve seat with a two stage sealing action, and at the same time provides a large flow when in the open position, owing to a large cross section opening. The valve features an improved sealing efficiency, in that when in the closed position an increase in pressure on the valve improves the performance of the valve, rather than increasing the likelihood of a leak. The valve is designed to be used in applications which permit the flow of material beyond the valve mechanism to discharge freely, whereby the discharged material activates a float mechanism so as to permit the valve to close when the discharged material reaches a preset level.

Abstract: A check valve having a valve housing with a pair of opposite end faces including an upstream end face and a downstream end face. The valve housing has a fluid passage extending axially therethrough between the upstream end face and the downstream end face. A first seating surface is formed within the valve housing around the fluid passageway and adjacent to the upstream end face. A seating ring is provided having a second seating surface adapted to engage the first seating surface when the seating ring is disposed in engagement with the valve housing. An o-ring is sized to reside between the first seating surface and the second seating surface when the seating ring and valve housing are placed in engagement to maintain the seating ring and valve housing in fixed relation to each other notwithstanding an outward axial biasing force thereon.

Abstract: A vacuum limiter valve assembly has a valve body screwed into an opening on a cargo tank. It has a relatively soft elastomeric, lightly spring-loaded seal closing the passageway through the valve body between the tank interior and the surrounding environment outside the tank. The relatively small area of the seal which would otherwise be exposed to tank cargo or vapors therefrom, is protected by a shield of material which is relatively inert and unaffected by most known chemicals, but also capable of a sealing function. The shield does not interfere with the normal sealing function, nor does it interfere with the opening of the vacuum limiter valve when needed to avoid development of excessive vacuum in the tank.

Abstract: A check valve or backflow preventer has a valve mechanism mounted to a valve cover for removal and replacement as a unit. The valve clapper is resiliently supported to accommodate variations in tolerance. The valve seat is removably secured within the valve body by compression of a resilient seal ring to engage opposed walls of the seat and body. A spring pretensioning member facilitates safe replacement and removal of the valve mechanism.

Abstract: Straight line flow rotary valves with the valve member flow passage (21) turned away from the pipeline flow axis (22), to dispose the valve internals to an access port (50) located downstream on the same flow axis of the valve member (11). Another embodiment is used in place of pipe elbows where the rotary valve internals are accessed through a port (50) on the same flow axis (22) as the upstream pipe. In both valve body embodiments, the flow is turned again, downstream of the valve member (11), to communicate with the connecting downstream piping which, in the first embodiment is along the same axis as the upstream pipe (22), and in the second embodiment, is on a different axis (39), and, is generally 45 or 90 degrees turned from the upstream pipe.In both embodiments the flow turns in a component (12) installed, through the body access port (50). In all embodiments the turning component also services as the pressure boundary access cover over the body opening (50).

Abstract: An irrigation sprinkler of the type having an inlet control valve is provided with a removable valve seat formed integrally with an inlet filter screen. The valve seat is positioned to engage a valve head to normally prevent water inflow to a sprinkler case, whereas the filter screen prevents entry of small rocks and other particulate debris into the sprinkler case when the inlet control valve is open. The valve seat is removable from the top of the sprinkler case, without requiring disconnection of the case from a water supply line, to permit flushing of collected debris or to permit replacement of a damaged valve seat.

Abstract: A ball check valve including a housing and a ball element movably positioned in the housing. An insert member is located at an inlet port of the housing, and an elastomeric element is molded directly onto the insert member and is positioned facing toward an outlet port of the housing for engagement with the ball element. A ball seat is ground into the elastomeric element at a precise angle matching a tangential angle of contact with the ball element such that engagement of the ball element with the ball seat forms a seal preventing fluid flow from the outlet port through the inlet port.