Abstract: A control valve structure, a using method thereof, a microfluidic chip, and a nucleic acid extraction device. The control valve structure includes: a cover plate layer, a first channel layer, a first adhesive layer, a second channel layer, at least one valve core, and at least one elastic film. When the valve core is embedded in the first limiting hole, the elastic film seals the first limiting hole, and the second limiting hole, the first through hole and the liquid outlet channel form a sample liquid flow channel; and when the valve core is embedded in the second limiting hole, the elastic film seals the second limiting hole so as to block the sample liquid flow channel.

Abstract: The present invention discloses a semiconductor device and an oxygen removal method thereof. The semiconductor device comprises: a process cavity, an oxygen removal pipe and an oxygen detection device, wherein the oxygen detection device comprises an oxygen detection pipe, a switching ball valve and an oxygen sensor; the oxygen detection pipe comprises a first pipe, a second pipe and a third pipe which are arranged in parallel and all connected to the oxygen removal pipe and the switching ball valve; the oxygen sensor is arranged on the third pipe; and, the switching ball valve is constructed in such a way that the switching ball valve communicates the first pipe with the second pipe in an oxygen removal stage and communicates the first pipe with the third pipe in an oxygen detection stage.

Abstract: A single coupled valve body of a faucet includes a faucet body, a water outlet pipe, and a mounting component. The faucet body defines a water inlet channel and a first water outlet channel. The water outlet pipe is connected to a bottom surface of the faucet body. The water outlet pipe includes a second water outlet channel communicated with the first water outlet channel. Both of the faucet body and the water outlet pipe are made of plastic and are integrally disposed. The mounting component includes a mounting ring and mounting threads. The mounting ring is hollow. The mounting threads are disposed on an outer surface of the mounting ring. The mounting ring is sleeved on an outer surface of the faucet body. The mounting ring and the mounting threads are made of metal.

Abstract: A single coupled valve body of a faucet includes a faucet body, a water outlet pipe, and water inlet pipe connecting threads. The faucet body defines a water inlet channel and a first water outlet channel. The water outlet pipe is connected to a bottom surface of the faucet body. The water outlet pipe includes a second water outlet channel communicated with the first water outlet channel. The water inlet pipe connecting threads are disposed in the water inlet channel. The faucet body, the water outlet pipe, and the water inlet pipe connecting threads are made of plastic. The faucet body, the water outlet pipe, and the water inlet pipe connecting threads are integrally disposed.

Abstract: A pressure independent control valve (PICV) is disclosed. The PICV has a body having a flow path extending therethrough and a cavity within the flow path to releasably receive a mechanism via an aperture. The PICV also has a cap comprising the mechanism. The cap is configured to move between a locked position where the cap is retained on the body and an unlocked position where the cap is releasable from the body. The cap is retained in the locked position by one or more bayonet fixings.

Abstract: A scoop for an aircraft turbine engine, this scoop including a body which is movable between at least two positions, including a first position in which it is configured to capture part of a first air stream flowing in a first direction, wherein the body is movable into a second position in which it is configured to capture part of a second air stream flowing in a second direction which is opposite to the first direction, and wherein the body is mounted to move freely between the at least two positions so as to automatically adopt the first position when the first air stream flows, and to automatically adopt the second position when the second air stream flows.

Abstract: A liquid level control system employs a flap gate for discharging liquid, but with a midstream headloss inducing device between the basin or tank and the flap gate. The flap gate opens when liquid level in the basin rises, and the opening of the gate is controlled by a counterweight positioned so as to decrease closing force as the gate opens farther, thus managing the outflow of liquid to efficiently return the basin to a design level. If flow from the basin is generally constant, the system will reach a point of equilibrium of gate opening and closing forces while liquid flows out from the basin.

Abstract: In at least some implementations, a charge forming device includes a body that has a throttle bore, a throttle valve associated with the throttle bore, a coupler and an actuator. The throttle has a valve head received within and movable relative to the throttle bore, and a valve shaft to which the valve head is coupled. The coupler is connected to the valve shaft and carries or includes a sensor element. And the actuator has a drive shaft coupled to the coupler so that rotation of the drive shaft is transmitted to the coupler and the valve shaft.

Abstract: An automatic faucet for a wash basin includes a control box. The control box includes a control box body, a solenoid valve, and a manual control member. Both the solenoid valve and the manual control member can control whether water flows out from a mixed water outlet of the control box body or not. The automatic faucet can realize a manually-operated spray function for use in an emergency when the solenoid valve fails.

Abstract: A water gun, having a trigger control, provides repeated discharge of metered volume stream of water, uses a sealed chamber containing a refillable reservoir of water pressurized by compressed air. The pressurized water supply is connected to a tubular housing, which transports the stream of water to a second end of the tubular housing to a nozzle assembly. A trigger controlled valve which is connected to a trigger mechanism, having an operator controlled trigger, initiating the flow of the stream. The initiated stream is volumetrically metered and terminated by a shuttle valve, which terminates flow upon reaching a valve seat which decelerates the velocity of the shuttle before it contacts the valve seat, which reduces stress on the seal. A method of sequential resetting is provided to reset the trigger valve, trigger mechanism and shuttle valve, enabling a repeated metered discharge.

Abstract: A solenoid assembly includes a solenoid adapted to be coupled to a solenoid connecting member extending from a support member. The solenoid assembly also includes a retaining bracket having a body portion and a securing portion. The body portion is adapted to be removably coupled to the support member. The securing portion is removably coupled to the solenoid. The retaining bracket is moveable between an unsecured position, and a secured position. The securing portion of the retaining bracket provides a spring force to the solenoid when the retaining bracket is in the secured position such that the solenoid is biased toward the solenoid connecting member to secure the solenoid between the solenoid connecting member and the securing portion of said retaining bracket.

Abstract: A valve for hydraulic control of fluid flow rate, comprising: a body provided with an inlet opening, an outlet opening and an actuating opening; a rotating hollow shutter rotatively housed inside said body, said rotating shutter being configured to be crossed by a fluid and to change the passage cross-section inside the valve, in which the rotating shutter comprises at least one first opening rotatively cooperating with at least one mated second eccentric opening, said rotating shutter being configured to be manually actuatable inside the body so that a rotation of said first opening with respect to said second opening is matched by a variation of the fluid passage cross-section in a direction substantially coinciding with the rotation axis.

Abstract: A fluid management assembly. The fluid management assembly comprises a valve body, a first chamber, a second chamber, a first flow passage, a second flow passage, a third flow passage and a fourth flow passage, wherein the first flow passage, the second flow passage and the third flow passage have openings in an outer wall of the valve body; the valve body is provided with the second chamber, the second flow passage and a first passage; and the first passage can communicate the first chamber and the second chamber. The fluid management assembly is provided with a plurality of channels, the first chamber and the second chamber.

Abstract: A backflow prevention assembly includes a body forming two buckets, wherein flow passes through the body from an inlet to an outlet along an axis and consecutively through each of the buckets. A single zone test cover encloses a first of the buckets to form a single zone chamber. A dual zone test cover encloses a second of the buckets with a dual zone cartridge assembly therein. The dual zone test cover has two test cocks. The dual zone cartridge assembly includes a frame having a valve seat, wherein the frame includes a lumen providing fluid communication from a dual zone chamber upstream of the valve seat to a first of the two test cocks of the dual zone test cover, and wherein the second of the two test cocks of the dual zone test cover is in fluid communication with the dual zone chamber downstream of the valve seat.

Abstract: The present invention relates to a welding-free valve that controls the passages of fluids such as gas, air, water, steam and oil in combi boilers and the similar devices, that is designed to ensure the flow rate, that is manufactured from a plastic material and that is resistant to high temperatures, chemicals, and pressure. The valve comprised of nail components is characterized by becoming a single piece, such that components constituting the device itself are fitted together and nails are placed, so that the assembly is completed.

Abstract: A bypass valve includes a base defining a base sealing surface, the base defining a upstream utility bore, a downstream utility bore, a meter inlet bore, and a meter outlet bore each extending into the base sealing surface; and a selector defining a selector sealing surface positioned in sealing engagement with the base sealing surface, the selector defining a primary passage and a secondary passage, the selector defining at least one primary passage bore extending into the selector sealing surface and connecting in fluid communication with the primary passage, the selector defining at least one secondary passage bore extending into the selector sealing surface and connecting in fluid communication with the secondary passage, the selector being rotatable relative to the base about and between a meter position and a bypass position, the selector connecting the upstream utility bore in fluid communication with the meter inlet bore in the meter position.

Abstract: The system utilizes fluid pressure achieved by increasing depth as a primary component for generation of energy. The system operates by varying its depth through changes in buoyancy. The ballast changes are controlled by electronics powered by a battery charged by a generator driven by a hydraulic system. Rather than utilizing a motor driven pump to generate pressure in the hydraulic system, a piston-like cylinder is applied pressure by the change in hydrostatic pressure as depth increases and draws fluid back into the cylinder as pressure decreases. As the system sinks, outside pressure forces hydraulic fluid to power a generator that charges a battery and powers a pump to deballast. As the system rises, the lowering of ambient pressure, and other internal forces, causes the hydraulic fluid to return to its initial state, where once the ballast begins to take in fluid, the whole process will continue to repeat.

Abstract: A control assembly of a solenoid valve for a delivery device; the control assembly comprising a first input configured to be coupled to a control device of the delivery device and to be supplied by a power supply voltage from the control device; a first output configured to be coupled to a second input of a solenoid valve; a control unit being coupled to the first input; and a drive unit coupled to the first output and to the control unit; the control unit being configured to detect a first voltage at the first input; the control unit being configured to control the drive unit so that, when the control unit detects a first voltage equal to a power supply voltage, the first output of the control assembly delivers: a rated voltage for a first period of time, and a hold voltage different from the rated voltage for a second period of time following the first period of time, and wherein the hold voltage is lower than the rated voltage.

Abstract: A neutron conversion foil for being used in a neutron detector includes a substrate having a first and second side. The substrate is covered at least on one of the first and second sides with a neutron conversion layer made of a neutron reactive material and being capable of capturing neutrons to thereafter emit light and/or charged particles. The neutron conversion foil is transparent to light such that light originating from the conversion of neutrons can pass through one or several of the neutron conversion foils and thereafter be collected and detected by a light sensing device.

Abstract: A solenoid operated modular valve includes a solenoid body having a coil and a pole piece positioned in the solenoid body. A valve body cartridge is connected to the solenoid body. A polymeric snap-in seat assembly includes first and second deflectable claw arms each having a barb engaging the valve body cartridge retaining the snap-in seat assembly in direct contact with the valve body cartridge. A seat engagement face when contacted by a valve seal member defines a valve closed position, and is displaced away from the seat engagement face in a valve open position when the coil is energized. A valve body cartridge body end portion includes a barb engagement face having pitched contact edges each having a continuous pitch directly contacted by the barb of the first and second deflectable claw arms to rotatably and frictionally lock the snap-in seat assembly to the valve body cartridge.

Abstract: A side valve having a lateral connector, comprising an outer sleeve and an inner sleeve that has an attachment section for attachment on the outer sleeve side, as well as a connector piece for connecting to a water supply. The outer sleeve and inner sleeve are connected with one another by way of a separate connection piece, onto which the connector is formed.

Abstract: Thermally compensated valve trim apparatus are disclosed. An example valve trim apparatus includes a valve plug having a recess, an insert fixed in the recess and having an opening therein. The insert is made of a material having a greater strength than a second material of the valve plug. The example valve trim apparatus also includes a valve stem having a threaded end disposed in the opening of the insert to form a valve stem connection, and a spacer operatively coupled to the valve plug and vale stem to affect a load exerted on the valve stem connection in response to a change in temperature.

Abstract: A faucet including a molded waterway assembly having a plurality of tubes overmolded within a valve interface member.

Abstract: A housing for a dispensing tube of a metering dispenser comprises a mounting half and a strike half carried by the mounting half. A channel for a dispensing tube is defined in the mounting half, and a plunger aperture is defined through the channel. The strike half pivots, relative to the mounting half, between a first pivotal position at least partially covering the channel and a second pivotal position exposing the channel and also slides relative to the mounting half, at least when the strike half is in the first pivotal position, between a first slide position obstructing pivotal movement of the strike half out of the first pivotal position and a second slide position permitting such movement. When the strike half is in the first pivotal position and the first slide position, a plunger strike surface on the strike half is in registration with and facing the plunger aperture.

Abstract: Tunable fluid ends reduce valve-generated vibration to increase fluid-end reliability. Tunable fluid end embodiments comprise a family, each family member comprising a fluid end housing with at least one installed tunable component chosen from: tunable check valve assemblies, tunable valve seats, tunable radial arrays and/or tunable plunger seals. Each tunable component, in turn, contributes to blocking excitation of fluid end resonances, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. By down-shifting the frequency domain of each valve-closing impulse shock, initial excitation of fluid end resonances is minimized. Subsequent damping and/or selective attenuation of vibration likely to excite one or more predetermined (and frequently localized) fluid end resonances represents further optimal use of fluid end vibration-control resources.

Abstract: In accordance with various embodiments, a plug head assembly is provided comprising a ceramic plug head having a frustroconical geometry, wherein the ceramic plug head has a proximal terminus and a distal terminus, wherein the ceramic plug head has a first coefficient of thermal expansion (CTE), a sleeve having a frustroconical geometry conforming to the ceramic plug head and a second CTE, wherein the second CTE is greater than the first CTE, a distal retainer having a frustroconical geometry conforming to the sleeve, the distal retainer having a first engagement portion for engaging the a proximal retainer, the proximal retainer having a second engagement portion for engaging the distal retainer, and a base that couples with the proximal retainer. In addition, thick banded plug heads are provided.

Abstract: A split valve assembly (10) comprising two valve portions (12, 14) complementarily shaped such that the first can sealingly engage with and co-operate with the second to allow the movement of material therethrough. Each valve portion (12, 14) comprises a housing (16, 18), a valve seat and a valve closure member (20, 20?). The assembly has a first configuration in which the first and second valve portions engage with one another, the valve closure members being closed, and a second configuration in which the two valve portions are disengaged from one another. The first valve portion has locking means (60) moveable relative to the second valve portion to selectively lock and unlock the two valve portions together. The locking means are received by the second valve portion, which comprises a shim.

Abstract: An external seal structure in a vacuum valve in which an upper end plate of a partition wall member is held between a valve body and a cylinder cover. An annular seal member for main fluid is placed between the upper end plate and the valve body to prevent material gas from leaking to atmosphere through an abutting section defined by the valve body and the cylinder cover connected in abutting manner. The main-fluid annular seal member is made of perfluoroelastomer. A fluorinated annular seal member made of fluorinated resin is placed between the upper end plate and the valve body and between the main-fluid annular seal member and the abutting section. A leak port communicated with outside air is provided in the valve body to communicate with between a seal point of the main-fluid annular seal member and a seal point of the fluorinated annular seal member.

Abstract: A drop-in cartridge style, four-chamber EGR valve, includes a valve actuator, a valve stem extending from the valve actuator and having two valve heads mutually spaced on the stem, and a frame having a plurality of longitudinally extending members connected by at least first and second ring members, the frame being divided along a longitudinal axis into two mating parts.

Abstract: Apparatus to attach a fluid valve bonnet are disclosed. An example apparatus includes a bonnet having a neck portion and a nut engaged with the neck portion of the bonnet to couple the bonnet to a body of a fluid valve. A central axis of the nut is coaxial to a longitudinal axis of the bonnet.

Abstract: A valve flange joint includes a valve flange and first and second duct flanges. The first and second duct flanges include respective first and second mating portions. The first mating portion includes a first duct rim, a first duct face in contact with a first face of the valve flange, and a first slot. The second mating portion includes a second duct face in contact with a second face of the valve flange, and a second rim. In an embodiment, the valve flange includes a tab that extends in an axial direction through the first slot and includes an inner surface radially inward of an outermost portion of the second mating portion. In another embodiment, a first thickness is defined between the first flange face and the second flange face. Second and third thicknesses are also defined for the first and second mating portions. The three thicknesses are substantially similar.

Abstract: Actuator bushings having integral seals are described herein. An example apparatus includes a bushing having a central bore to receive a stem and an annular groove at an end of the bushing. The annular groove surrounds the bore to define a flexible ring to form a seal against the stem.

Abstract: Tunable check valves reduce valve-generated vibration to increase the reliability of tunable fluid ends. Selected improved designs described herein reflect disparate applications of identical technical principles (relating to, e.g., the vibration spectrum of an impulse). Tunable check valve embodiments comprise a family including, but not limited to, tunable check valve assemblies, tunable valve seats, and tunable radial arrays. Each such tunable embodiment, in turn, contributes to blocking excitation of fluid end resonances, thus reducing the likelihood of fluid end failures associated with fatigue cracking and/or corrosion fatigue. By down-shifting the frequency domain of each valve-closing impulse shock, initial excitation of fluid end resonances is minimized.

Abstract: A valve assembly includes a valve body having a body recess and a bonnet including a bonnet recess having a bonnet mating surface. The valve assembly further includes a valve cage disposed within an interior of the valve body, the valve cage including a body portion extending along a longitudinal axis and a circumferential mating protrusion extending from an outer surface in a transverse direction, the mating protrusion including an upper mating surface and a lower mating surface. The upper mating surface is disposed within the bonnet recess to be aligned with the bonnet mating surface, and the lower mating surface is disposed within the body recess to be aligned with the body mating surface, wherein the upper and lower mating surface are not parallel. Accordingly, clamping forces acting on the mating protrusion include a longitudinal and tangential component, allowing for increased clamping forces without plastically deforming the mating protrusion.

Abstract: In a positioning device for a processing plant, a valve is provided comprising a valve housing, a valve seat, and a valve member actuated by use of a lead-through opening in the valve housing. A top is provided for screwing on the lead-through opening and for rigidly coupling the valve housing to an actuator. A deformation buffer is arranged or formed on mutually opposite respective screw stop surfaces of the top and of the valve housing and which is deformed in a predetermined manner when screwing the top on the lead-through opening.

Abstract: A valve apparatus includes valve box, valve shaft, first flexible film, and second flexible film. The valve box includes inlet and outlet, and forms a space therein for housing the fluids. The valve shaft is inserted into through-hole formed in the wall of the valve box, and moves in the longitudinal direction of the through-hole to move valve body in order to block the flow of the fluids from inlet to outlet. The first flexible film includes a through-hole into which the valve shaft is inserted. The outer peripheral end of the first flexible film is fixed to the peripheral edge of the through-hole, and the peripheral edge of the through-hole of the first flexible film is fixed to the outer periphery of the valve shaft to close the gap between the through-hole and the valve shaft. The second flexible film forms a part of the wall of valve box.

Abstract: Multi-section valve bodies having face seals are described herein. An example multi-section valve body includes a first body defining a first portion of a valve passageway and having a fluid flow axis, the first body having a first sealing surface substantially perpendicular to the fluid flow axis and a first annular wall substantially parallel to the fluid flow axis, the first body having an annular cavity defined in the first sealing surface to receive a seal. The example valve also includes a second body having a bore defining a second portion of the valve passageway, the second body having a first end surface to be substantially parallel to the first sealing surface, wherein the first sealing surface is to engage the first end surface and the first annular wall is to extend into the bore of the second body when the first body is coupled to the second body.

Abstract: A new valve for regulating the flow of liquid has two housings that are removably attached to one another. When the housings are separated, the liquid can no longer pass through the valve. A system of magnetic elements is used to cycle the flow of liquid (urine) through the valve. The valve is typically connected to an indwelling bladder catheter and the valve allows the patient to be at least temporarily disconnected from a collection bag.

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 split valve apparatus for the control, charging, discharging and/or regulating the flow of powders, liquids, slurries and/or fluids. The valve has two valve portions complementarily shaped such that the first can sealingly engage with and co-operate with the second to allow the flow of material therethrough. Each valve portion comprises a housing, a valve seat and a valve closure member, which is movable between two positions.

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 valve body assembly for use in an automotive transmission is provided. The valve body assembly includes a first valve body part formed of powdered metal and a second valve body part formed of powdered metal. The first valve body part is attached to the second valve body part by a brazed joint. A method of forming a valve body assembly is also provided. The method includes forming a first valve body part from powdered metal, forming a second valve body part from powdered metal, and sinter brazing the first and second valve body parts together to form a brazed joint between the first and second valve body parts.

Abstract: The present disclosure provides a valve for controlling the flow of abrasive particles along a predetermined path from the outlet of a hopper to a conveying line in a particle collection or transportation system. The design of the valve reduces the occurrence of erosive wear resulting from contact with the flow of abrasive particles. A method of making the valve that enhances the hardness of localized areas in the valve that are subject to high wear conditions is also disclosed.

Abstract: A new valve for regulating the flow of liquid has two housings that are removably attached to one another. When the housings are separated, the liquid can no longer pass through the valve. A system of magnetic elements is used to cycle the flow of liquid (urine) through the valve. The valve is typically connected to an indwelling bladder catheter and the valve allows the patient to be at least temporarily disconnected from a collection bag.

Abstract: A micro-fluidic valve system is provided which includes a micro-fluidic valve actuator apparatus, a fluid distribution manifold and a micro-fluidic POD apparatus. The POD apparatus includes a POD housing that defines an interior central passage extending from a distal mounting end of the housing to a proximal portion thereof. The POD apparatus further includes a stator device disposed in the interior central passage, and includes a distal stator face that cooperates with an opening in the distal mounting end to define a gasket receptacle. A relatively thin, elastomeric gasket member is disposed in the gasket receptacle of the housing in abutting contact between the stator and a communication face of the manifold. A fluid-tight seal is then formed between each respective stator communication port of the stator device and a corresponding manifold communication port of the manifold.

Abstract: An idle air control valve includes a sleeve that defines an internal space and an electrical connector including terminals attached to the sleeve. The connector is joined to the sleeve to enclose the actuator.

Abstract: A valve plug assembly includes a support member having a support member body having a first end and a second end. A stem bore adapted to receive a valve stem may extend axially inward from the second end, and a mating protrusion may extend axially outward from the first end. The valve plug assembly also includes a plug tip having a first end and a second end, and a plug surface adapted to engage a valve seat is disposed adjacent to the first end. A mating bore may extend axially inward from the second end, and the mating protrusion may be received into the mating bore such that a threaded portion of the mating protrusion engages a threaded portion of the mating bore. Additionally, an adhesive bonds the threaded portion of the mating protrusion to the threaded portion of the mating bore.

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.