Abstract: A valve for a bypass conduit is comprised of a rigid inner frame having an arm with a tab at one end and a hinge at an opposite end. A flexible outer seal is positioned over the inner frame, the flexible outer seal defining a peripheral edge to substantially house the tab and arm of the inner frame. The valve is pivotable from a first position to a second position on the bypass conduit.

Abstract: Pressure relief valves for use in high pressure underwater applications that may include a plunger, a body with a mating surface corresponding to the shape of a mating surface sub-section of the plunger, and one or more sealing elements, such as a pair of O-rings, are disclosed.

Abstract: A check valve may include a housing having a bore therethrough, the bore including an inner surface and a bearing face; a check seat adaptor coupled to the housing; a seal in the housing, the seal including a seat bore; and a dart disposed in the bore between the seal and the bearing face and axially moveable between closed and open positions. The dart may include a tail and a head that has at least one dart inlet and sealingly engages the seal when the valve is closed. The tail defines an inner chamber having an outlet that is in fluid communication with the bore. The dart inlet(s), the inner chamber, and the outlet may be in fluid communication and together define a dart flow path through the dart. A biasing device may urge the dart toward the seal.

Abstract: Examples of a two-piece guide bushing apparatus are provided. A specific example comprises a guide bushing base comprising flanges which extend into the interior of the guide bushing base, and a guide bushing center comprising a spring clip. The guide bushing center is coupled to the guide bushing base and configured to be removable from the guide bushing base.

Abstract: Check valve are disclosed having a primary seal and a secondary seal, where the primary and secondary seals resist movement of a fluid through the check valve, and the secondary seal can provide a backup seal in an instance where the check valve does not function as intended. The primary and secondary seals can be formed by first and second sealing ridges, respectively, and a valve body can be positioned within the check valve, between a valve support, the first sealing ridge, and a second sealing ridge. The valve body is configured to move relative to the first and second sealing ridges, and can have a position wherein a portion of the valve body is engaged against any of the first and second sealing ridges.

Abstract: A check valve provided in a bore of a modulator block having inlet and outlet passages comprises a valve housing having an upper portion and a seat portion formed with a lower portion of the valve housing and having inlet and outlet ports communicating with the inlet and outlet passages, respectively; a cap sealing the upper portion of the valve housing and secured to the modulator block; a plunger movable up and down in the valve housing to open and close an internal flow passage between the inlet and outlet ports; an elastic member provided between the cap and the plunger and elastically pressing the plunger against the seat portion; a sealing member installed on the plunger; and an anti-jamming member provided between the sealing member and a contact surface to prevent the sealing member from being caught in the contact surface between the plunger and the seat portion.

Abstract: The valve member includes a valve body and a seal. The valve body defines a first frusto-conical surface and an outside annular cavity. The seal extends within the outside annular cavity and includes a first tapered and circumferentially-extending surface adapted to sealingly engage the tapered surface of the valve seat. In another aspect, the seal includes an annular bulbous protrusion from which the first tapered and circumferentially-extending surface angularly extends, the first tapered and circumferentially-extending surface extending between the annular bulbous protrusion and the first frusto-conical surface of the valve body. In another aspect, an offset distance is defined between the first frusto-conical surface of the valve body and at least a portion of the first tapered and circumferentially-extending surface of the seal, the offset distance extending in a direction that is perpendicular to at least the first frusto-conical surface of the valve body.

Abstract: A valve seat. The valve seat is used in a fluid end of a fracturing pump. The external surface of the valve seat has a tapered portion that retains the valve seat in the fluid end. The external surface also has a portion that is substantially cylindrical. A hardened insert is integrated into a strike face of the valve seat. The tapered portion is at a first end of the valve seat and the tapered portion is at a second end of the valve seat. The second end of the valve seat may be formed such that its exterior surface does not contact the fluid end.

Abstract: A valve plug assembly includes a plug base, a first end of the base arranged for attachment to a valve stem, a second end of the plug base including a bore having a first portion and a second portion. The second portion of the bore is a conical terminus forming a first seat. A spacer has a through bore, a first end, and a second end, and is sized for insertion in the bore of the plug base and has a conical shape to engage the first seat, and the spacer also forms a second seat. A plug tip has a through bore and a conical end engaging the second seat and is arranged to engage the valve seat, and a cap screw extends through the plug tip and the spacer to mechanically secure the plug tip to the plug base.

Abstract: A fitting for shutting off and/or regulating flows of substance for use in pressure ranges above 50 bar has a housing body and a valve disc which can be operated from a drive lying outside the housing body via a valve shaft. The housing body is provided with a maintenance opening that can be shut off in a pressure-tight manner by a self-sealing lid that has a seal. In order to allow objects that are as large as possible, in particular the valve disc, to be guided through the maintenance opening during inspection works, without increasing the weight of the housing body, the maintenance opening has a rectangular passage cross section. In contrast to known circular maintenance openings which are known in this pressure range, a rectangular passage cross section permits a smaller surface area for the passage cross section and therefore a lighter housing body.

Abstract: A valve assembly includes a valve body, a seal, and a supplemental material. The valve assembly configured to reduce the effects of wear and erosion of the seal and valve body by including material with increased hardness. The supplemental material has a higher hardness level than the valve body and is inserted on the contact surface of the valve body. The seal can include a plurality of materials, each having different hardness levels. The location of the supplemental material can vary and the overall radial distribution on the contact surface may vary.

Abstract: A control valve is provided for a fluid treatment apparatus, including a housing with at least one cylinder defining a fluid flow path in the apparatus, each cylinder having an associated reciprocating piston valve. The valve includes a first piston valve half; a second piston valve half complementary to the first piston valve half; and a resilient seal constructed and arranged for being sandwiched between the first and second piston valve halves. The first piston valve half is constructed and arranged for engaging the cylinder before the second piston valve half, and having an exterior peripheral edge defined by a plurality of peripherally spaced teeth creating flow spaces between the teeth.

Abstract: A system and valve assembly that is adapted to increase the efficiency of an upstream water meter. By way of the valve assembly entrained water bubbles can be removed from a water supply. This, in turn, increases the density of the water running through the water meter. This ensures that the water meter is not inaccurately including entrained air as metered water. The result is more accurate water readings and reduced utility bills. The assembly can be externally adjusted using an adjustment tool so as to increase or decrease the tension on an interior spring which, in turn, increases or decreases the rate at which the interior block oscillates.

Abstract: Sealing structures and valve assemblies including the sealing structures. The sealing structures include a first body, which defines a first surface. The sealing structures also include a second body, which defines a second surface. The second body also defines a gland, which extends into the second body from the second surface, defines a gland opening on the second surface, and is free of both a tool entry point and a tool exit point. The second body further defines a retention structure projecting partially across the gland. The sealing structure also includes a resilient sealing body positioned within the gland. The retention structure retains the resilient sealing body within the gland, and the resilient sealing body forms a fluid seal between the first body and the second body when the resilient sealing body is brought into pressing engagement with both the first surface and the gland.

Abstract: A valve device for a gas tank, includes a body and a check valve provided in an injection passage to inject gas into the gas tank. The check valve includes a valve seat, a case fixed in the injection passage while a space is provided between an inner peripheral surface of the injection passage and the case to enable gas to flow through the space, and a valve element accommodated in the case. The case includes a cylindrical portion, and is configured such that the bottom of the cylindrical portion, provided at an opposite side to the valve seat, defines a range where the valve element is axially movable. The valve element includes a head portion that can block a valve hole of the valve seat, and a sliding portion formed to be axially movable with respect to the cylindrical portion.

Abstract: Pressure relief valves for use in high pressure underwater applications that may include a plunger, a body with a mating surface corresponding to the shape of a mating surface sub-section of the plunger, and one or more sealing elements, such as a pair of O-rings, are disclosed.

Abstract: A fuel filling aperture opening and closing device includes a closing member turned to an open position to open a fuel filling aperture by an introduction of a fuel filling nozzle. The closing member is provided with a flap member having a ring-shaped seal member, and an urging device urging the flap member to be positioned at a closed position. The seal member is provided with seal portions respectively inside and outside, and one of the inner and outer seal portions is a plate-shaped portion pressed by the urging against a projection piece bordering an opening edge portion of a pass-through opening of the fuel filling nozzle, and the other of the inner and outer seal portions is formed by an inside circumferential projecting portion and an outside circumferential projecting portion respectively pressed against the flap member.

Abstract: A fluid end of a pump includes a body that defines a suction bore, a discharge bore, and a plunger bore. A first central longitudinal axis extends through the suction bore, the discharge bore, or both. A second central longitudinal axis extends through the plunger bore. A chamber is defined at an intersection between the suction bore, the discharge bore, and the plunger bore. An interior surface of the body that at least partially defines the chamber comprises a first wall portion that is at least partially planar and oriented at an angle that is less than or equal to 15° from perpendicular to the first central longitudinal axis.

Abstract: The pump unit (10) has a particularly simple design, which includes just two housing parts (14, 15) and also four valve closure members (37) and pump pistons (25, 29). The valve closure members (37) are preferably identical to one another and are trapped in a pocket between both housing parts (14, 15). The housing parts (14, 15) are preferably permanently interconnected by an ultrasonic weld seam. The valve closure members are formed by disc-like or plate-like plastic parts, which are resilient per se and which may optionally have a central pin (42) as an assembly and orientation aid. As desired, the valve closure members bear against their respective valve seat (43) with or without bias and form valves which open and close particularly reliably, are responsive to the slowest flow velocities and can be easily sterilized.

Abstract: A valve includes: (i) a valve seat; (ii) a guide assembly including a check portion, the guide assembly being configured to move between a first closed position where the check portion contacts the valve seat and a first open position where the check portion is spaced apart from the valve seat; (iii) a plurality of guides that are sized and configured to contact an outer perimeter of the guide assembly to axially align the guide assembly at least when (a) the guide assembly is in the first closed position and (b) the guide assembly is in the first open position; (iv) a plurality of channels, each of the plurality of channels being located between at least two of the plurality of guides.

Abstract: A check valve including a valve member movable with a passage in a housing is disclosed. A biasing means applies a biasing load to the valve member to urge the valve member into engagement with a seating surface within the passage to control fluid flow. An environmental seal member is secured to the valve member by a retainer member. The retainer member includes a lip elastically deflectable by the environmental seal member upon compression and/or deflection of the environmental seal member. When the valve member engages the seating surface, the environmental seal member engages the seating surface to compress and/or deflect the environmental seal member, deflects the lip of the retainer member into engagement with the seating surface. Extrusion of the environmental seal member between the retainer member and the seating surface can be reduced and the engagement between the lip and the seating surface may be a sealing engagement.

Abstract: A valve component and method for controlling fluid flow comprises a body having a first surface and a second surface. At least one tortuous flow channel extends between the first surface and the second surface. The flow channel is at least partially defined by a floor portion and a ceiling portion. The body is formed as one-piece by additive manufacturing to concurrently define the flow channel as a void space. At least one of the floor portion and ceiling portion is disposed at an acute angle relative to a plane containing a layer of material forming the body.

Abstract: A sealing element of a valve, e.g., a gas valve, for controlling a medium includes a base body having a sealing surface, the sealing surface either (i) being inclined in relation to a center axis of the sealing element or (ii) having at least one inclined area. In addition, a valve seat support of the valve for controlling a medium includes: a first ring-shaped valve seat in a first valve seat plane; a second ring-shaped valve seat in a second valve seat plane; and a passage aperture situated between the first valve seat and the second valve seat, the first and second valve seat planes being perpendicular to a center axis of the valve seat support.

Abstract: A check valve includes a hollow cylindrical valve body including an inclined rim at a first end, an annular section on an inner surface and tapered to a second end, and an annular groove on an outer surface; a hollow cylindrical outlet member including an axial channel, openings around an end surface, an internal annular trough, an annular flange extending outward from the trough of the outlet member, and an annular groove on an outer surface; a moveable member including an annular groove on an outer surface, a stem distal the groove of the moveable member, and an annular trough on an inner surface; a ring including an axial channel and openings around the channel; and a biasing member having a first end anchored in the trough of the moveable member and a second end anchored in the trough of the outlet member.

Abstract: A flapper valve includes a valve body having a hinge member. A flapper is pivotally mounted to the valve body through the hinge member. At least one of the valve body and the flapper includes a multi-stage valve seat. The multi-stage valve seat includes a first sealing zone and a second sealing zone that is distinct from the first sealing zone. The first sealing zone is configured to provide pressure containment at the valve body when the flapper is exposed to a first pressure and the second sealing zone is configured to provide pressure containment at the valve body when the flapper is exposed to a second pressure that is greater than the first pressure.

Abstract: An anti-siphon one-way valve includes a valve seat, a valve core, a return spring, and a Y-shaped ring. The valve seat has an inlet and an outlet. The valve seat has a valve cavity therein. The valve cavity communicates with the inlet and the outlet respectively. The valve core is slidably mounted in the valve cavity. The Y-shaped ring is installed on the valve core and leans against the side wall of the valve cavity. The Y-shaped ring has a Y-shaped cross-section. The return spring is fitted on the valve core. The present invention provides a better anti-siphon effect, and the requirements for precision in size and installation are lower, and the production cost is reduced.

Abstract: A closure for a beverage container holder, comprising a unitary closure assembly, comprising an integral hole having a diameter, wherein the diameter is sufficient to passably dispose a neck of a beverage container bottle therethrough, and wherein the diameter is smaller than the diameter of the beverage container bottle, a resiliently compressible lining disposed about the inner circumference of the integral hole, a gripping area for a user's hand, and a lateral engaging surface constructed of a resiliently compressible material and capable of exerting a lateral engaging force against a lateral engaging surface for a beverage container holder when integrally positioned, wherein the lateral engaging surface is generally cylindrical, and wherein the lateral engaging surface is of a narrower diameter than the gripping area and a larger diameter than the integral hole.

Abstract: The present invention discloses a multi-component valve system for use in pumps such as fracking pumps for use in subterranean resource production. The assembly includes a retaining pin, a guide on the retaining pin, a valve on the retaining pin, an insert on the retaining pin, a retainer above the insert on the retaining pin, and a retainer cap inertia welded to the end of the retaining pin. In a particular embodiment, the guide component is stamped and folded to create the desired shape.

Abstract: A check valve includes a tubular casing, an abutment member, a valve member and a resilient member. The abutment member is flexible, is disposed in the tubular casing, and defines a central opening interconnecting first and second spaces that are defined in the tubular casing. The valve member is disposed in the tubular casing and is movable between a blocked position where the valve member blocks the central opening to isolate the first space from the second space, and an unblocked position where the valve member is spaced apart from the abutment member such that the first and second spaces communicate with each other. The resilient member is mounted to the tubular casing and biases the valve member toward the blocked position.

Abstract: An apparatus and method for controlling a pressure drop of a fluid is disclosed. A sleeve includes a plurality of flow passages in a wall of the sleeve. A member slides relative to the sleeve to reveal at least a portion of the plurality of flow passages to control flow of the fluid through the flow passages. The plurality of flow passages are at azimuthally-and axially-staggered locations around the sleeve.

Abstract: A valve assembly for a fuel injector that includes a sleeve member having an interior chamber, a piston member supported for movement within the interior chamber of the sleeve member and separating an upstream pressure side of the valve assembly from a downstream pressure side of the valve assembly, and a dynamic sealing device mounted to one of the sleeve member and the piston member for sealingly isolating the upstream pressure side of the valve assembly from the downstream pressure side of the valve assembly. The dynamic sealing assembly includes a PTFE seal member having a generally C-shaped cross-section defining an internal cavity having an opening about the outer periphery thereof the seal member, and a helical spring disposed within the internal cavity of the seal member for providing a constant sealing force to the seal member.

Abstract: Tunable down-hole stimulation arrays feature closed-loop control of spatial arrays comprising several connected stimulators. Each stimulator is responsive to a timed activation signal. Stimulators periodically transmit bursts comprising a plurality of vibration frequencies, each burst having an adjustable power spectral density (PSD) that is tunable via an adjustable rebound cycle time. Rebound cycle times also affect vibration interference among array stimulators, while simultaneous or sequential timed activation signals from a programmable controller affect directional propagation of combined vibration wave fronts from an array. Stimulator PSD's are adjusted for resonance excitation and fracturing of adjacent geologic materials. Closed-loop feedback control incorporates backscatter vibration from stimulated geologic material. As fracturing proceeds to smaller (proppant-sized) fragments having higher resonant frequencies, PSD's are up-shifted, increasing relative power in higher vibration frequencies.

Abstract: A check valve is provided which may be installed horizontally or in other non-vertical orientations, and used with variable frequency drives and other applications without the valve disk becoming misaligned. In one aspect, the valve provides a housing with an inner surface and a passage, a flange within the housing which divides the housing into upstream and downstream portions, and extending around the inner surface, defining a valve seat and a valve aperture, a poppet positioned in the downstream portion, including a valve disk and a valve stem extending from the valve disk, the valve disk engaging the valve seat, being moveable, and being resiliently biased in the closed position against the valve seat to inhibit fluid flow in a first direction, and a guide removably mounted on the inner surface of the housing, the guide receiving the valve stem of the poppet valve as the poppet valve moves.

Abstract: The invention relates to the simple and safe construction of a high-pressure connection (1) for transferring gaseous and/or liquid media, in particular for the refuelling of vehicles with hydrogen. According to the invention, the high-pressure connection (1) comprises a housing (2) with a media passage (P) and a leaktight piston (3) of which the front end is disposed in a sealing manner with respect to an annular seal. The seal (4) has a seal support (4a) in which is inserted a sealing insert (4b), the sealing support (4a) consisting of a harder plastics and the sealing insert (4b) consisting of a softer plastics.

Abstract: Tunable fluid end embodiments comprise a family, each family member comprising a pump housing with at least one installed tunable component chosen from: tunable valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. For example, a tunable valve assembly or tunable radial array selectively attenuates valve-generated vibration at its source, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. Adding tunable valve seats and/or tunable plunger seals to a fluid end facilitates optimal damping and/or selective attenuation of vibration at one or more predetermined (and frequently localized) fluid end resonant frequencies. Thus, the likelihood of exciting destructive resonances in a pump's fluid end housing is further reduced.

Abstract: A tunable valve assembly reduces valve-generated vibration. One embodiment comprises a valve body and valve seat having substantially collinear longitudinal axes. A rebound characteristic frequency is associated with rebound of the elastic valve body base plate from forceful contact with the valve seat. A central cavity in the valve body encloses a spring-mass damper optionally immersed in a dilatant liquid and having a damper resonant frequency approximating a pump housing resonance. A lateral support assembly adjustably secured to the valve seat has a support resonant frequency designed in conjunction with the rebound characteristic frequency and the damper resonant frequency. Combined hysteresis heat loss associated with the above three vibration frequencies is reflected in lower closing energy impulse amplitude and damping of associated vibrations.

Abstract: A gas lift valve that has a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet, and a flow tube located inside the body. The flow tube is translatable in the axial direction between at least a first and a second position. A venturi orifice located inside the body along the flow path. A seal part is located proximate to the outlet of the body. A flapper is connected with the body by way of a hinge part and the flapper has at least a first open position and a second closed position. The closed position is where the flapper contacts the seal thereby closing the flowpath and the second closed position is where the flapper does not contact the seal and does not close the flowpath.

Abstract: A device and method are described for extending the life of check valves. An improved check valve having a double poppet and tapered guides is more robust, and a check valve protection device between the check valve and the environment into which fluid is injected protects the valve from a contaminating or corrosive environment. The check valve and check valve protection device are small and light weight to prevent vibration-induced failures. The check valve protection device preferably has an interior volume that fills quickly by relatively few cycles of the lubricant pump to reduce delay of lubricant to the injection point.

Abstract: A discharge valve including a tubular, valve seat and a valve guide disposed above the valve seat. The valve guide has a discharge passage plug and a guide rod that is affixed to, and projects downwardly from, the bottom of the plug. The valve guide also has an interiorly threaded, lifting sleeve that is affixed to, and projects upwardly from, the top of the plug. A piston is disposed between the valve seat and the valve guide. The piston has a conical, head portion for engaging the top of the valve seat, and a stem portion that is affixed to, and extends upwardly from, the head portion. The stem portion has a longitudinal socket within which the guide rod is slidably received. The stem portion also has a number of apertures that intersect the socket for providing pressure relief to the socket. A compressed spring is disposed between the valve guide and the head portion of the piston for normally retaining the head portion in engagement with the valve seat.

Abstract: Tunable valve assemblies attenuate valve-generated vibration at one or more predetermined assembly resonant frequencies which are typically altered to correspond to specific pump housing resonant frequencies. Each tunable valve assembly comprises a valve body having a peripheral groove spaced radially apart from a central reservoir. An adjustable flange may be coupled to the valve body for imposing a predetermined shear preload by partially constraining a viscoelastic element in the reservoir. One or more valve assembly resonant frequencies are thus predictably altered. Further, the associated valve-generated vibration spectrum is narrowed, and its amplitude is reduced through hysteresis loss of closing impulse energy at each predetermined assembly resonant frequency. Assembly resonant frequencies are additionally or alternatively altered through choice of viscoelastic elements and inclusions (e.g., shear-thickening materials) in the reservoir and/or peripheral groove.

Abstract: A tunable valve assembly comprises a valve body, an adjustable preload flange centrally coupled to the valve body, and a viscoelastic element; the assembly attenuates valve-generated vibration transmitted to a pump housing. The vibration spectrum is narrowed and its amplitude reduced through hysteresis loss of closing impulse energy. The viscoelastic element comprises a peripheral groove portion coupled to a central reservoir portion via a plurality of fenestration portions. At least a first predetermined assembly resonant frequency is achieved by changing valve assembly compliance (with associated hysteresis loss) through adjustment of annular shear preload applied by the flange to the viscoelastic element reservoir portion. Such preload adjustment effectively maximizes hysteresis loss at the resonant frequency. At least a second predetermined assembly resonant frequency is achieved through choice of a circumferential shear-thickening material within the viscoelastic element groove portion.

Abstract: An impulse tolerant valve assembly comprises a valve body having a longitudinal axis and a central internal cavity, the cavity enclosing a nonlinear spring-mass damper optionally immersed in a dilatant liquid. The central internal cavity is enclosed by a proximal valve body portion and a distal elastic valve body base plate, the base plate having a peripheral valve seat interface. Impulse tolerance results in part from hysteresis heat loss due to compliance of the elastic valve body base plate, as well as from heat loss associated with operation of the nonlinear spring-mass damper. The combined heat loss is reflected in reduction of closing energy impulse amplitude and damping of induced valve body vibrations. Compliance of the elastic valve body base plate increases closing energy impulse duration and narrows the corresponding induced vibration spectrum. The valve body has at least one guide and at least one peripheral seal-retention groove.

Abstract: Redundant metal-to-metal seals for use with internal valves are described. A plug having redundant sealing functionality for use with a poppet of an internal valve includes a tapered surface to sealingly engage a seat of the poppet. Additionally, the plug includes a seal adjacent the tapered surface and disposed in a groove defined by the plug to sealingly engage the seat.

Abstract: A tunable valve assembly attenuates valve-generated vibration at one or more predetermined assembly resonant frequencies. The assembly comprises a valve body having a peripheral groove spaced radially apart from a central reservoir. An adjustable preload flange is centrally coupled to the valve body for changing assembly compliance and for imposing a shear preload by partially constraining a viscoelastic element in the reservoir. Assembly resonant frequencies are thus predictably altered. Further, the vibration spectrum is narrowed and its amplitude reduced through hysteresis loss of closing impulse energy at each such altered resonant frequency. At least a first predetermined assembly resonant frequency is achieved through adjustment of shear preload, and at least a second predetermined assembly resonant frequency is achieved through choice of a viscoelastic or composite element in the peripheral groove.

Abstract: A pump assembly with valve-seat interface architecture configured to extend the life of pump components and the assembly. A valve of the pump assembly is equipped with a conformable valve insert that is configured with a circumferential component having the capacity to reduce the radial strain of its own deformation upon its striking of a valve seat at the interface within the pump assembly. The circumferential component may include a concave surface about the insert, a rounded abutment at the strike surface of the insert, or a core mechanism within the insert that is of greater energy absorbing character than surrounding material of the insert. Additionally, the valve seat itself may be configured for more even wear over time and equipped with a conformable seat insert to reduce wear on the valve insert.

Abstract: A check valve (fluid on-off valve device) capable of attaining high sealability in either case where a differential pressure is high or low, comprises a valve body assembly (valve body) contacting and separating from a valve seat portion for communicating and blocking a fluid passage. The valve body assembly comprises a valve body, a low-pressure seal portion constituted out of soft material and a high-pressure seal portion constituted out of harder material than the low-pressure seal portion. In blocking a fluid passage, when a differential pressure between an upstream path and a downstream path in the fluid passage is relatively low, the low-pressure seal portion comes into close contact with a protrusion to block the fluid passage, while when the differential pressure is relatively high, the low-pressure seal portion is compressively deformed by the differential pressure and the high-pressure seal portion comes into close contact with the valve seat body, thus blocking the fluid passage.

Abstract: A valve body and seal assembly comprises a valve body symmetrical about a longitudinal axis and comprising a circumferential seal retention groove and a frusto-conical valve body impact area for contacting a valve seat. An elastomeric seal is cast-in-place in the circumferential seal retention groove. Each seal comprises first and second seal sections in contact via an intra-seal interface, the interface simultaneously extending radially outward and longitudinally. First seal sections may comprise a first polyurethane having a higher modulus than a second polyurethane of which second seal sections may be comprised. First seal sections are cast and partially cured in a mold which is rotating about the longitudinal axis. Second seal sections are cast after the first seal sections are partially cured, resulting in the intra-seal interface shape described above. Cross-linking between first and second seal sections across the intra-seal interface is thus facilitated.

Abstract: A valve apparatus that has a longitudinal axis therethrough comprises a valve seat member, a valve closure member, a fluid flow path, and a resilient valve insert member. The valve seat member comprises a hollow bore and a first frustoconical contact surface that has an inner perimeter and an outer perimeter. The valve closure member comprises a valve body and a second frustoconical contact surface that is adapted to seal against the first frustoconical contact surface in a strike face area. The valve closure member is movable along the longitudinal axis of the valve apparatus. The fluid flow path extends through the bore of the valve seat member and between the valve seat member and the valve closure member. This fluid flow path is closed when the second frustoconical contact surface is sealed against the first frustoconical contact surface.

Abstract: A valve insert including a ring made of a resilient material. The ring has a shape that is defined by the rotation of an irregular polygon around a central axis. Superposing a quadrilateral and a circle forms the irregular polygon.

Abstract: A suction valve seat and guide assembly has an outer ring and a peripheral flange projecting outwardly from the bottom of the outer ring, and an inner surface with a top part sloping downwardly and inwardly toward the center of the outer ring. The outer ring has an outer surface that slopes upwardly and inwardly from the flange. The guide has an inner ring positioned within the outer ring and a number of spaced-apart fins connecting the inner ring to the outer ring. A retainer has an internal passageway, an externally threaded, upper segment within the top of which is fitted the peripheral flange of the seat; a middle segment that is affixed to the bottom of the upper segment and has a polygonal cross section for easy gripping by a wrench; and, a bottom segment that is affixed to the bottom of the middle segment.