Abstract: A downhole tool includes a tubular having an outer surface and an inner surface defining a flowbore having a longitudinal axis, and a backpressure valve cartridge arranged in the flowbore. The backpressure valve cartridge includes a passage, a valve seat arranged in the passage, and a flapper valve pivotally mounted relative to the valve seat in the passage. The valve seat is shiftable within the backpressure valve cartridge along the longitudinal axis to shift the flapper valve between a first position, wherein the flapper valve is free to pivot relative to the valve seat, and a second position, wherein the flapper valve is pivoted away from the valve seat and maintained in an open configuration.

Abstract: A valve, having a valve housing which has a fluid inlet chamber and a fluid outlet chamber, having a valve seat which is arranged between the fluid inlet chamber and the fluid outlet chamber, and having a closure body which is movable back and forth between a release position and a blocking position. The closure body abuts against the valve seat in a fluid-tight manner in the blocking position, and wherein the fluid inlet chamber and the fluid outlet chamber are connected to one another in a fluid-conducting manner in the release position. The valve seat and the closure body each have a sealing surface, which are opposite one another in the blocking state, and an elastically deformable sealing element which is arranged between the sealing surfaces in the blocking state and which completely stretches over one of the sealing surfaces.

Abstract: A gas exhaust system particularly designed to collect and exhaust gases, particularly carbon dioxide, from beverage fountain systems where the gasses ordinarily are exhausted to the immediate environment in which the equipment sits, which when an enclosed environment (i.e. a building) may result in a hazardous condition to persons therein.

Abstract: A high pressure pump includes a pressurization portion, a discharge portion, a body portion, a valve member, an urging member, valve hold member and a limiting portion. The body portion includes a relief passage, an inlet, a valve seat, and an outlet. The valve member includes a large diameter portion and a small diameter portion. The small diameter portion is located between the valve seat and the large diameter portion and has an outer diameter smaller than an outer diameter of the large diameter portion. The valve hold member surrounding and holding the large diameter portion. The limiting portion capable of limiting a motion of the valve hold member in a separation direction. According to this, a pressure in a fuel rail from extraordinarily increasing again after the relief valve is opened once.

Abstract: In certain embodiments, a vial adaptor comprises a housing configured to couple the adaptor with a vial, an access channel, a regulator channel, and a regulator assembly. The access channel is configured to facilitate withdrawal of fluid from the vial when the adaptor is coupled to the vial. The regulator channel is configured to facilitate a flow of a regulating fluid from the regulator assembly to compensate for changes in volume of a medical fluid in the vial. In some embodiments, the regulator assembly includes a flexible member configured to expand and contract in accordance with changes in the volume of the medical fluid in the vial. In some embodiments, the flexible member is substantially free to expand and contract. In some embodiments, the flexible member is not partly or completely located in a rigid enclosure.

Abstract: A spool switching valve device may include a columnar spool housing and spherical valve bodies. The spool housing includes first input port cavity portions, valve body movable portions and valve seat members. Each valve seat member has a through hole and includes a second input port portion. A second valve seat portion is provided to open and close the gap between valve body movable portion and the second input port portion. Each valve body movable portion includes an output port penetrating the side surface of the spool housing to communicate with the outside of the spool. Each valve seat mounting portion includes an engagement receiving portion suppressing the detachment of the valve seat members when the valve seat member is actually mounted. Each valve seat member includes an engagement portion fitted into the engagement receiving portion when the valve seat member is mounted to the valve seat mounting portion.

Abstract: In certain embodiments, a vial adaptor comprises a housing configured to couple the adaptor with a vial, an access channel, a regulator channel, and a regulator assembly. The access channel is configured to facilitate withdrawal of fluid from the vial when the adaptor is coupled to the vial. The regulator channel is configured to facilitate a flow of a regulating fluid from the regulator assembly to compensate for changes in volume of a medical fluid in the vial. In some embodiments, the regulator assembly includes a flexible member configured to expand and contract in accordance with changes in the volume of the medical fluid in the vial. In some embodiments, the flexible member is substantially free to expand and contract. In some embodiments, the flexible member is not partly or completely located in a rigid enclosure.

Abstract: In certain embodiments, a vial adaptor comprises a housing configured to couple the adaptor with a vial, an access channel, a regulator channel, and a regulator assembly. The access channel is configured to facilitate withdrawal of fluid from the vial when the adaptor is coupled to the vial. The regulator channel is configured to facilitate a flow of a regulating fluid from the regulator assembly to compensate for changes in volume of a medical fluid in the vial. The regulator assembly can include a valve configured to transition between a closed configuration and an opened configuration.

Abstract: An auto-fill type float collar assembly is provided. The float collar assembly of the present invention has at least one curved flapper-style valve, preferably constructed of composite, non-metallic material. Each flapper of the present invention has a substantially 90° range of motion, and is closed via a torsion spring. Each flapper is held in the open (or “auto-fill”), position via an external shifting mechanism passing around, rather than through, the central flow bore of the assembly. A floatable actuation ball can be run with the tool, or pumped downhole, in order to selectively actuate the assembly and close the flappers when desired.

Abstract: A prepayment system for supplying water or gas by means of a wireless intelligent card is described. The present invention also relates to a bidirectional meter specially designed to electronically record the consumption of water or gas.

Abstract: An auto-fill type float collar assembly is provided. The float collar assembly of the present invention has at least one curved flapper-style valve, preferably constructed of composite, non-metallic material. Each flapper of the present invention has a substantially 90° range of motion, and is closed via a torsion spring. Each flapper is held in the open (or “auto-fill”), position via an external shifting mechanism passing around, rather than through, the central flow bore of the assembly. A floatable actuation ball can be run with the tool, or pumped downhole, in order to selectively actuate the assembly and close the flappers when desired.

Abstract: A double check valve (10) with two separate elements (20, 25) individually movable to close the valve and collectively movable to open the valve. The separate elements are independently closing the valve, and collectively controllable to open the valve, to allow pressure release or to allow injection of fluid (e.g. lubricant). In an example, the double check valve includes two separate check valves with a stinger element (30) between them which is operable to internally sting the one check valve when (e.g. by action of) the other check valve is stung by a user (e.g. using a stinger means) thereby to open both check valves individually and the double check valve as a whole.

Abstract: It is addressed to provide a hydraulic control valve for preventing high-speed rotation of a valve body of a check valve incorporated in the hydraulic control valve of a type that pressure oil is supplied from a tandem, path and a parallel path via the check valve. A check valve unit is constituted by a main unit and a valve body of a first check valve. A throttle is provided on a right side of an O-ring groove. On a main unit side, there is formed a cylindrical housing portion in which a threaded portion is formed on an outer peripheral portion for fixation to a casing of the hydraulic control valve. On an inner peripheral surface of the housing portion, a groove is formed in an axial direction. Meanwhile, the valve body of the first check valve has a rib. At a time of assembly, the rib, is inserted into the groove of the main unit as indicated by an arrow.

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 valve apparatus and methods associated thereof are provided. The valve apparatus includes a valve housing structure. A first valve portion is connected to the valve housing structure, wherein the first valve portion has a sealing edge. A second valve portion is positioned at least partially within the valve housing structure. A constrictable membrane has a pressurizable interior compartment, wherein the constrictable membrane supported by the second valve portion and positioned proximate to the first valve portion, wherein at least a portion of the constrictable membrane is movable to engageable with the sealing edge of the first valve portion.

Abstract: The present device is a bidirectional side-slit duckbill valve apparatus for use with catheters and similar devices. The apparatus can comprise a duckbill valve configured to allow fluid to flow through it only in a first direction and one or more side-slit valves configured to allow fluid to only flow through them in a second direction, opposite the first direction. In an embodiment, fluid can only flow through the duckbill valve if it is under a substantially positive pressure and can only flow through the side-slit valves if it is under a substantially negative pressure. In an embodiment, fluid that is not pressurized will not flow through either the duckbill valve or the side-slit valve. In an embodiment, the bidirectional side-slit duckbill valve apparatus can also comprise a funnel for directing a guidewire.

Abstract: An anti-flooding device (10) including a duct (12) for passage of a flow of liquid, and a limiter (14) inserted along the duct (12) for passage of liquid and defining a section for passage of the liquid that decreases progressively as the flowrate of liquid increases, with closing of the duct (12) once a given threshold flowrate has been reached. The limiter (14) has at least one male element (18) and at least one female element (20), which are mobile with respect to one another so that they slide into one another as the flowrate of liquid increases. Progressive insertion into one another of the male element (18) and the female element (20) defines the section of passage. The male element (18) and female element (20) are shaped with respect to one another so as to reduce the section of passage as the flowrate increases, with closing of the duct (12) for passage of liquid as soon as a given threshold flowrate is reached.

Abstract: A fluid distribution control element for use in a ball check valve assembly having a valve housing defining a valve chamber and a first inlet opening spaced from a second inlet opening. The control element is arranged inside the valve housing to transition along a substantially linear path of displacement. The control element includes first and second obstruction elements each being configured to respectively fluidly seal the first and second inlet openings. The control element also includes a web portion, having a web length, which secures the first obstruction element to the second obstruction element. The web length is configured to restrict one of the first and second obstruction elements from sealing a respective inlet opening when the other obstruction element is sealing the other respective inlet opening. The web length is further configured to minimize the seat-to-seat distance the control element must travel along the linear path of displacement.

Abstract: An anti-back flow vacuum breaker valve that includes a valve body having a cylindrical internal chamber having an upper portion and a reduced diameter lower portion forming a horizontal valve seat, and having an inlet communicating with the chamber on the underside of the valve seat, and having an outlet communicating with the chamber on the over side of the valve seat. A ball is positioned within the internal chamber for sealing the inlet of the valve body. A valve cap having a lower portion mating with the upper portion of the valve body sealed and securely attached to the valve body, and having an internal conical chamber having a central vertical journal therein, forming a journal vent with a vent seat at the lower end thereof aligned with the valve seat of the body.

Abstract: Two independent poppets/valves that open and close independently as a quick connect coupling is mated and unmated are employed as part of a cooling system for high end data processing systems. More particularly, the present invention comprises a quick connect poppet valve having two internal, independently functioning sealing seats therein disposed within a serially connected flow path to prevent leakage and to minimize the effects of debris.

Abstract: A pressure relief valve for blown fiber closures is provided having constituent components fabricated from plastic. An adaptor is provided for connection to a blown fiber closure, and a body welded to this adaptor, is provided to enclose a piston and a spring within, such that they are protected from the ingress of silt and water. The piston is arranged to provide a double seal such that a pressure relief valve plug and an opening in the enclosing body are closed or opened simultaneously to prevent the ingress of silt and/or water on the one hand and the unhindered escape of pressurized fluid on the other.

Abstract: To reduce the clearance volume for a crank-side concentric suction and pressure valve, it is proposed to arrange a sealing 20 axially abutting on the suction and pressure valve 2,3, wherein the sealing 20 consists of a number of pressure packings 21a, 21 which are arranged axially one behind the other.

Abstract: A vapor pressure equalization assembly having an underpressure relief assembly and an overpressure relief assembly in fluidic communication with the vapor space of a liquid storage tank (vessel). The underpressure and overpressure relief assemblies each have movable pistons sealingly engageable with respective sealing members, and biasing members which exert respective biasing forces to maintain the pistons in sealing engagement with the sealing members. A predetermined underpressure or overpressure differential between the vapor space pressure and atmospheric pressure will cause one of the pistons to open fluidic communication of the vapor space to equalize the vapor space pressure with that of the surrounding atmospheric pressure.

Abstract: The invention relates to a valve apparatus for setting and monitoring the clamping pressure of a clamping device (9) for workpieces which are to be clamped, in particular in lathes, having at least one pressure control valve (1A, 1B), via which the clamping pressure is set for the clamping device (9), and having at least one pressure sensor (6A, 6B) which detects the respective clamping pressure of the clamping device (9), which clamping pressure is to he adjusted in relation to a predefinable setpoint clamping pressure. It is possible by way of the valve apparatus to this effect to set the clamping pressure which is relevant in terms of safety, and also to monitor it, in particular to maintain or reduce it, during the machining in the sense of an adjustment.

Abstract: The present invention relates to a connector device to connect a first and a second fluid container, directly or indirectly. The connector device exhibit a first and a second connection means, a pierceable barrier member, a piercing member, a fluid transfer channel and a pressure normalization channel. The pressure normalization channel is arranged to normalize an increasing pressure inside second fluid container. A valve arrangement permitting fluid to flow in a first and a second direction is arranged in the pressure normalization channel. The valve arrangement exhibit a cracking pressure in at least the first direction. The present invention provides for a connector device which reduces the risk of clogging the barrier filter.

Abstract: A fuel receiver assembly, that permits replacement of a worn fuel receiver without draining the fuel tank, includes a check valve receptacle having a male-pipe-threaded nipple which engages the female-threaded pipe coupling of the fuel tank. The check valve receptacle has a spring-biased, normally closed check valve that prevents fuel from escaping from the fuel tank. Fuel pressure from the refueling pump opens the normally-closed check valve. The check valve receptacle is designed to be a relatively permanent installation in the fuel tank, having ultra-low-wear components. The check valve receptacle also has a female-threaded socket that is coaxial with the male-pipe-threaded nipple. A specially-designed male-threaded fuel receiver engages the female-threaded socket. Sealing between the check valve receptacle and the replaceable fuel receiver is accomplished by an O-ring seal installed on the fuel receiver.

Abstract: Provided is a pressure control valve including a movable part (1) which operates by a differential pressure, a first valve (3, 4, 5) for reducing a primary pressure to a secondary pressure, a second valve (10, 11) which operates to block a flow path between an inlet flow path (12) and an outlet flow path (8) for discharging the secondary pressure when the first valve operates to open the inlet flow path (12) for introducing a fluid having the primary pressure, and a transmission mechanism (2) which links the operation of the movable part with the operations of the first and the second valves, in which either one of the movable part and the first valve is separated from the transmission mechanism.

Abstract: A fluid distribution control element for use in a ball check valve assembly having a valve housing defining a valve chamber and a first inlet opening spaced from a second inlet opening. The control element is arranged inside the valve housing to transition along a substantially linear path of displacement. The control element includes first and second obstruction elements each being configured to respectively fluidly seal the first and second inlet openings. The control element also includes a web portion, having a web length, which secures the first obstruction element to the second obstruction element. The web length is configured to restrict one of the first and second obstruction elements from sealing a respective inlet opening when the other obstruction element is sealing the other respective inlet opening. The web length is further configured to minimize the seat-to-seat distance the control element must travel along the linear path of displacement.

Abstract: A pressure limiting valve is provided which has a valve body assigned on the high-pressure side to a valve seat and an operating piston combined with the valve body to form a unit. The valve body and the operating piston are jointly spring-loaded and bound a pressure space which can be opened as a function of pressure with respect to a connection cross-section open in the return flow by way of the operating piston moving in a sliding guide.

Abstract: A double directional check valve and flow restrictor combination including a housing which contains a pair of axially-aligned check valves and a flow restrictor disposed between the check valves. Dry purge air flows into the housing through the flow restrictor, which facilitates smooth and uniform flow of the air, and out of one of the check valves to a dessicant chamber to dry or regenerate dessicant in the chamber. The housing is fitted with flanges or other connection structures for quick, easy and convenient attachment of the housing to a piping network in an air, nitrogen or other process drying system.

Abstract: A scroll compressor that simplifies the structure of a valve and decrease the size of the entire compressor includes a casing having a first chamber into which a fluid is sucked and a second chamber at which compressed fluid is discharged, a driving unit housed inside the casing to generate a driving force, a compressing unit having a fixed scroll and an orbiting scroll connected to the driving unit by a rotational shaft to compress and discharge the fluid when the driving unit is operated. A valve assembly is rotatively installed to the upper surface of the fixed scroll, opening/closing a discharge hole at which the compressed fluid is discharged and opening/closing a passage connecting the first chamber and the second chamber.

Abstract: In a scroll compressor which is capable of simplifying a structure of a valve, decreasing a size of a whole compressor and lowering a noise occurred in the valve by having simultaneously a function for preventing a backward flow of a fluid and a function for preventing a compressor from being in a vacuum state simultaneously with one valve, a scroll compressor in accordance with the present invention includes a casing having a hermetically sealed certain space divided into a first chamber at which a fluid is sucked and a second chamber at which a compressed fluid is discharged, a driving unit housed inside the casing and generating a driving force, a compressing unit including a fixed scroll and an orbiting scroll connected to the driving unit by a rotational shaft in order to compress and discharge the fluid when the driving unit is operated and a valve assembly rotatively installed to the upper surface of the fixed scroll, opening/closing a discharge hole at which the compressed fluid is discharged and open

Abstract: A hydraulic power steering system (10) for turning steerable wheels of a vehicle. The system (10) comprises a steering gear (12) including a hydraulic motor and a steering valve. The steering gear is susceptible to pressure fluctuations that cause noise during steering. The system (10) further comprises a pressure relief valve (14) having an unactuated condition and actuated conditions. The pressure relief valve (14), in the unactuated condition, restricts fluid flow through the pressure relief valve (14). In an actuated condition, the pressure relief valve (14) permits fluid flow through the pressure relief valve (14). The pressure relief valve (14) progressively is operable from the unactuated condition to an actuated condition as a pressure differential between the inlet (38) and the outlet (40) of the steering gear (12) increases.

Abstract: An anti-geyser shut-off valve assembly for a water sprinkler irrigation system. It has a valve housing, a valve member, a coil spring, and a push nut that would be installed on the elongated shaft member of the valve housing for restricting the distance that the valve member may be biased away from a valve housing. When a sprinkler housing is mounted above the shut-off valve assembly and is operating properly, there is minimal obstruction to the water flow passing therethrough. If the sprinkler head or riser is broken off, the uncontrolled geyser of water will be automatically shut off and a thin stream of water would be sprayed upwardly to function as a flag identifying that the sprinkler head requires repair.

Abstract: An improved self contained automatic bladder control device includes a valve assembly mount for releasibly receiving a valve assembly. The preferably cylindrical mount has a textured outer surface designed to interact with urethral tissue. Thus the mount can be placed nonsurgically into a urethra and in time it will be held against movement by the tissue interaction with the textured outer surface, yet the mount will still be removable without surgery. Two embodiments of valve assemblies are disclosed, each of which provides a sphincter-like operation of the bladder control apparatus. A first embodiment is designed to use Bernoulli's law to hold open the valve apparatus after a short period of muscle contraction. The second embodiment is designed to use the fact that the force generated by hydrostatic pressure is directly related to the area on which it impinges, to accomplish the desired valve holding period.

Abstract: A safety valve arrangement for an installation operating with a pressure medium has a pressure medium input and a pressure medium output connected by a valve. The valve comprises a valve seat and a valve closing element. The valve closing element is moveable between an open position and a closed position and has an active surface that is subjected to the pressure medium in the opening direction of the valve. The valve closing element also has an auxiliary surface that is subjected to the pressure medium in the opening direction of the valve only when the valve closing element is lifted from the valve seat. A spring arrangement holds the valve closing element closed and the valve closing element moves from a closed position to an open position when the pressure medium acting upon the valve closing element is greater than the opposing force of the spring arrangement acting upon the valve closing element.

Abstract: An improved two-way check valve for controlling the flow of fluid to an element from either one of a pair of hydraulic sources in a hydraulic automatic transmission, the check valve having a flow cavity in which a pivotal flapper valve is mounted so as to alternately cover one of two inlet openings to the cavity.

Abstract: A flow control valve includes a piston moveable in a cylindrical chamber between an inlet opening and an outlet opening. The piston head has a maximum diameter smaller than the wall of the chamber to define a fixed orifice. The opposite end of the piston has a sleeve which partially blocks the outlet opening depending upon the position of the piston in the chamber which in turn depends upon the pressure differential across the fixed orifice.

Abstract: A device for controlling or metering fluid flow in either direction through a conduit. The device comprises a shell disposed in communication with the conduit. Disposed within the shell is a body having a pair of metering orifices axially extending therethrough. A valve is, disposed within the shell and adapted such that fluid flow in a first direction through the device urges the valve to allow fluid flow through the first metering orifice and closes off the second metering orifice. Upon a flow reversal, the fluid urges the valves means to operate in the opposite manner wherein the first metering orifice is closed off and communication is established through the second metering orifice. The device is adapted for use in a reversible vapor compression air conditioning system. In this application, one metering orifice in the body is sized to provide proper metering for heating mode operation and one metering orifice is sized to provide proper metering for cooling mode operation.

Abstract: A pressure responsive check valve designed to quickly close in response to a drop in pressure below a pre-determined level. When used at the top of a fluid filled tank such as one used for heating oil, the valve prevents tank syphon by stopping fluid flow at the tank in the case of breakage of supply or return lines, The valve is contained in a pre-assembled unit for ease of installation.

Abstract: A dual baffle system which can be incorporated into automatic air inlets used in livestock facilities. This system consists of four different components: two baffles, spring, opening mechanisms, and stationary bracket. This baffle system is positioned inside an automatic air inlet. The two baffles are hinged at the top and bottom of the inlet respectively and the opening between the baffles is allowed to increase or decrease. The opening mechanism is connected to the bottom baffle and allowed to slip through the stationary bracket. These two components allow the two baffles to open and close simultaneously. The spring allows the system to open and close to maintain the desired flow rate through the inlet.

Abstract: A multi-function valve for installation in a riser of a sprinkler system provides two valve functions. One function is to stop flow automatically when breakage of a sprinkler head causes the flow rate to exceed a predetermined threshold. The second function is to prevent back flow and reduce the risk of the "hammer effect" causing damage to the sprinkler system.

Abstract: In accordance with an illustrative embodiment of the present invention, an expansible chamber device includes a piston movable within a cylinder, a head on the cylinder having intake and exhaust ports, a normally-open intake valve for closing the intake port automatically when the flow rate or velocity of a working medium entering the cylinder reaches a predetermined value, variable restraining means for inhibiting closing of the intake valve in response to flow, an exhaust valve for preventing escape of working medium from the cylinder until cylinder pressure is reduced to a set level, spring means for opening the exhaust valve at that level, and means operable near the top-dead-center position of the piston for automatically opening the intake valve and for closing the exhaust valve to enable the cycle to repeat. A unique system for controlling the variable restraining means, as well as methods for regulating the flow or working medium through said valves, also is disclosed.

Abstract: In accordance with an illustrative embodiment of the present invention, an expansible chamber device includes a piston movable within a cylinder, a head on the cylinder having intake and exhaust ports, a normally-open intake valve for closing the intake port automatically when the flow rate or velocity of a working medium entering the cylinder reaches a predetermined value, variable restraining means for inhibiting closing of the intake valve in response to flow, an exhaust valve for preventing excape of working medium from the cylinder until cylinder pressure is reduced to a set level, spring means for opening the exhaust valve at that level, and means operable near the top-dead-center position of the piston for automatically opening the intake valve and for closing the exhaust valve to enable the cycle to repeat. A unique system for controlling the variable restraining means, as well as methods for regulating the flow or working medium through said valves, also is disclosed.

Abstract: A valve device comprises a vertical, tubular housing, a vertical valve member in the housing, and a coil-form compression spring encircling the member and urging it upwardly against a valve seat in the housing lower end. The member includes an upper, obturating portion and a lower, closure portion and its internal surface includes an upper annular part which diverges downwardly at a gradually increasing angle away from the location of the obturating portion in the valve closed condition. The internal surface includes a lower annular part converging downwardly at a substantial angle to the housing axis and situated directed radially outwards of the spring. Below the seat is an outlet mouth encircled by a rim, the closure part having a bottom lip at such clearance relative to the rim that, shortly before the closure part seals against the seat, the rim and the lip act shearingly upon liquid therebetween. The member includes three guiding fins in sliding contact with the internal surface.

Abstract: A valve for use in a hydraulic compression tool. The valve has a frame with a central chamber, a first inlet, a second inlet and a discharged outlet. A first gate is located at the first inlet. A plunger assembly having a first plunger member and a second plunger member are movably mounted in the central chamber with a spring biasing the plunger member against the second plunger member. The second plunger member has a conduit between the second inlet and the first plunger member. The valve has a first home position that substantially prevents fluid from flowing therethrough. The valve has a second manual release position wherein fluid can flow into the first inlet and out the discharge outlet. The valve also has a third automatic relief position such that in the event a predetermined maximum fluid pressure is exceeded a gate will open between the first plunger and the second plunger member to allow fluid to flow from the second inlet through the valve and out the discharge outlet.

Abstract: A double poppet area relief valve for use in a well treatment pumping system. The relief valve includes a housing comprising a cylinder and a body. A piston is disposed in the cylinder and has a push rod extending therefrom into the body. A double poppet assembly is attached to an end of the push rod. In one embodiment, the double poppet assembly includes a sealing poppet assembly for sealing with a poppet seat when in a closed position and an orificing poppet assembly for providing throttled fluid flow through the body when in an open position. In a second embodiment, a ring holder is attached to the push rod and has a sealing poppet ring and an orificing poppet ring disposed thereon. The sealing poppet ring and the orificing poppet ring function in a manner similar to the sealing poppet assembly and orificing poppet assembly, respectively, of the first embodiment. With both embodiments, wear is minimized on the sealing poppet so that the valve will reseal on the poppet seat when closed after usage.

Abstract: A homogenizer device, in particular for the production of whipped cream, comprising in combination, the following components: an external sleeve and an internal sleeve between which is formed a convoluted labyrinth, the internal sleeve housing a valve element which forms with it a chamber communicating with said labyrinth and with the delivery tube for the base mixture, said valve element consisting of a stem bearing a valve at one of its ends and a valve at its opposite end, the former being a valve for controlling the dispensing of the whipped cream and the latter being a valve for controlling the conduction of the mixture through said labyrinth, said valve element being also translatable against a counteracting spring.

Abstract: An emulsifying assembly for immiscible liquids comprises a metering-mixing device and an emulsifying device coupled thereto. The metering-mixing device includes two supply ducts for the liquids to be mixed and an output duct for the formed mixture, the ratio of the two liquids being held constant by an integral shutter unit effective to control the passage cross-section of the fluid supply ducts. The emulsifying device comprises a base body by which a tapering passage is formed communicating with a constant cross-section cylindrical duct leading to a plenum chamber from which the emulsified mixture is discharged.

Abstract: A backflow preventer valve including a housing structure having inlet and outlet ports therethrough for attaching to system conduits, a chamber formed in the housing, a pair of spaced valve seats associated with one of the ports including a space formed between the valve seats, a movable valve assembly including a first member hingedly attached to the valve housing structure for movement in the chamber between a closed position adjacent to the valve seats and an open position angularly related to the closed position, the valve assembly having a clapper portion defined by relatively movable inner and outer members, a flexible valve member including first and second portions and separate members for attaching the flexible valve member respectively to the inner and outer clapper members, the first portion of the flexible valve member being engageable with one of the pair of spaced valve seats in the closed position thereof and the second portion being engageable with the other of the pair of valve seats in the c