Abstract: A passive backflow prevention apparatus includes a tubular base that has a non-planar end defining an opening. The passive backflow prevention apparatus also includes a flap assembly that includes a non-planar flap. The passive backflow prevention apparatus further includes a hinge that pivotably couples together the tubular base and the flap assembly such that the flap assembly is pivotable from an open position, in which the non-planar flap of the flap assembly is disengaged with the non-planar end to enable a fluid, flowing in a first direction, through the opening, to a closed position, in which the non-planar flap of the flap assembly is engaged with the non-planar end to prevent a fluid, flowing in a second direction, through the opening.

Abstract: Valve assemblies for reciprocating downhole pumps are provided. The valve assembly may comprise: a flow cage comprising a housing and a tubular insert; an annular valve seat positioned below the tubular insert; and an elongated sealing member positioned above the annular valve seat and at least partially received into the tubular insert. In some embodiments, the elongated sealing member may be more stable and may more securely engage the valve seat compared to spherical valve balls. Related methods are also provided.

Abstract: A valve comprises a first housing including a first lumen extending therethrough and defining a first disk-facing surface and a second housing including a second lumen extending therethrough and defining a second disk-facing surface, the second housing being mated to the first housing so that the second disk-facing surface faces the first disk-facing surface in combination with a flexible disk gripped between gripping portions of the first and second disk-facing surfaces, the disk including a slit extending therethrough which, when acted upon by a fluid pressure of at least a predetermined threshold level opens to permit fluid flow between the first and second lumens and which, when acted upon by a fluid pressure less than the threshold level remains sealed preventing fluid flow between the first and second lumens and a relief well between opposing portions of the first and second housings radially outside the gripping portions, a width of the relief well exceeding a width of a radially outer portion of the f

Abstract: An air cleaner assembly can contain an air filter element to filter contaminant material out of an air stream. In some examples, the air cleaner assembly includes a housing with an integrated noise suppression chamber for supplying air to a downstream compressor. The housing forms a cavity into which an air filter element is inserted. Contaminated air enters the housing and passes through the air filter. Filtered air can discharge from the housing through a first opening supplying air to a combustion engine and a second opening supplying air to a compressor. Air supplied to the compressor passes from the interior of the housing containing the filter element and through the integrated noise suppression chamber before being discharged. The acoustic energy released by the filtered air stream exiting the air cleaner assembly may be reduced by passing through the noise suppression chamber.

Abstract: An anti-rat flap member for sewer/draining pipe check is removably attached to the valve body. The valve body defines an interior volume therein which is preferably substantially open and unobstructed (except for the flap member). The flap member acts both as a seal to prevent the back-flow of sewage/drainage water and is normally in a closed position to prevent the passage of rats. The flap member comprises a row of sharp projections attached by known means (such as integrally molded, glued, rivetted or screwed) to the outermost side of the flap member facing the downstream section of the valve. The projections must be at an angle to the surface of the sheet, preferably at an angle which will prevent the rodent from gnawing and biting or even lifting the flap member with their mouth.

Abstract: A pressure relief device, comprising: a valve body (100) having a central bore, wherein a valve seat (130) is disposed within the central bore of the valve body (100); a plug (200); a spring (500) configured to press the plug (200) into sealing engagement with the valve seat (130); a bumper (300) extending from the plug (200), wherein the bumper (200) extends along a central axis of the spring (500); and a holder (400) configured to lock into the valve body (100), wherein the holder (100) is configured to hold the spring (500) within the valve body (100).

Abstract: In a flow regulator (1) having a regulating body (3) and a regulating profile (8), which therebetween configure a regulating gap (11), the available width or opening cross section of said regulating gap (11) being variable by pressure, it is provided that regulating protrusions (9) are disposed such that neighboring regulating protrusions (9) therebetween enclose dissimilar spacings (10, 13).

Abstract: A check valve may include an upper housing defining an inlet, a lower housing defining an outlet, and a cavity interposed between and defined by the upper and lower housings for fluidly connecting the inlet and the outlet. The check valve may further include a flexible valve member mounted in the cavity to selectively permit fluid flow in a first direction, and prevent fluid backflow in a second direction opposite to the first direction. A filter member may be mounted in the upper housing, upstream of the flexible valve member. The filter member may have an elongated portion configured to maximize surface area thereof exposed to the fluid flow, and restrict passage of undesirable matter in fluid flowing through the check valve.

Abstract: A flow regulator for a compressed natural gas (CNG) system is defined by a housing having at least one inlet port, at least one outlet port and at least one interior passage fluidically interconnecting the inlet and outlet ports. A mechanical bypass valve is disposed between the inlet and outlet ports and enabled by a movable biased feature which moves based on inlet pressure and in which the bypass valve is closed only after inlet pressure is greater than a predetermined threshold. The bypass valve is a fail safe wherein gas regulation does not occur until the inlet pressure is sufficient to close the bypass valve. The flow regulator further includes a coolant bowl defined by a serpentine channel formed in a coolant plate as well as a balanced valve as a regulator control feature in conjunction with a weighting or loading mechanism having a diaphragm.

Abstract: Inlet check valves and methods can include a seat body, a movable disc, a spring, and a disc retention cage. The disc retention cage captures the movable disc to the seat body through retention elements, which engage in a groove circumferentially disposed around a flange of the seat body. The movable disc has a stem on the outlet side, which guides the movement of the disc by engaging with a through-hole in the disc retention cage. A compression spring maintains the movable disc in a normally closed position against the seat body.

Abstract: Threaded drill string component having a hollow elongate body with a box end portion, an opposing pin end portion and a cylindrical mid-body portion that extends longitudinally between the respective box and pin end portions and has a variable wall diameter. The mid-body inner wall of the mid-body portion has at least one projecting portion or upset that is spaced from both the box and pin end portions and extends inwardly toward a central longitudinal axis of the hollow body and a plurality of troughs defined in the mid-body inner wall of the mid-body portion.

Abstract: The present invention is an improved superimposed standing valve and related method of harvesting oil and gas using a conventional rod pump equipped with the improved superimposed standing valve. The present invention includes a valve cylindrical sleeve disposed between a top cylinder and a main standing valve such that the valve cylindrical sleeve can slide along the top cylinder a fixed valve stroke. A plurality of openings are sealed and unsealed by the movement of the valve cylindrical sleeve. The present invention isolates the pump from the head pressure of the oil and gas inside of the tubing thereby enabling the standing valve of the pump to remain open on both the upstroke and the downstroke. As a result, the improved superimposed standing valve increases pump efficiency and reduces the risk of gas locking. Its cylindrical sealing surfaces also prevent solid formation particles from gravitating downward into the pump chamber.

Abstract: A sanitary insertion unit includes an insertion housing in which at least one closing valve having an annular channel is provided. An annular valve body composed of elastic material is arranged in the annular channel, the valve body deforms under the pressure of the incident fluid in such a way that the valve body tightly closes the annular channel. The annular channel of the closing valve has a profile on an inner and outer channel wall. Via the profile, better controllability of the closing valve during the closing process of the valve body of the closing valve can be achieved and disturbing noises and vibrations are effectively avoided.

Abstract: A control valve unit including a pair of valve bodies, a separator plate interposed between the pair of valve bodies and provided with an opening, a collar attached to the separator plate through the opening and having a valve port and a valve seat, a check ball separating from the valve seat and seating on the valve seat by hydraulic pressure to open and close the valve port, and a combining part combining the pair of valve bodies to sandwich the collar between an end surface of one of the pair of valve bodies and an end surface of the separator plate.

Abstract: A medical manifold for use in providing access to a fluid flow path. The medical manifold can include a valve member having a diaphragm and first and second support members extending from a bottom surface of the diaphragm. The first and second support members can be positioned to define a line of symmetry that's bisects the bottom surface of the diaphragm. The diaphragm can have a first position in which a top surface thereof is generally planar and a second position in which the diaphragm is flexed downward around the line of symmetry.

Abstract: An exhaust emission control device for an internal combustion engine including multiple reed valve chambers which are provided to cylinder head portions of a multi-cylinder engine. The reed valve chambers are formed by covering recessed portions in the cylinder head portion with reed valve covers. Upstream sides of the reed valve chambers communicate with the atmosphere via a secondary air supply pipe. Downstream sides of the reed valve chambers communicate with exhaust ports via communication passages provided to the cylinder head portion. The reed valves are interposed between the upstream sides and the downstream sides of the reed valve chambers, and are opened by exhaust pulsation pressure. In the cylinder head portion, the multiple reed valve chambers are disposed with spaces therebetween. The reed valve covers communicate individually with the secondary air supply pipe, and the reed valve covers are connected in series by the secondary air supply pipe.

Abstract: A beverage nozzle for mixing at least a first beverage ingredient and a second beverage ingredient into a homogeneous mixture is disclosed herein. The beverage nozzle may include a housing having a first portion and a second portion. A first inlet may be in fluid communication with the housing. The first inlet may be configured to provide the first beverage ingredient to the housing. A second inlet may be in fluid communication with the housing. The second inlet may be configured to provide the second beverage ingredient to the housing. The beverage nozzle also may include a mixing core disposed within the housing. The mixing core may be configured to mix the first beverage ingredient and the second beverage ingredient into the homogeneous mixture. An outlet may be disposed about the housing. The homogeneous mixture may exit the housing by way of the outlet.

Abstract: A flow regulator for a compressed natural gas (CNG) system is defined by a housing having at least one inlet port, at least one outlet port and at least one interior passage fluidically interconnecting the inlet and outlet ports. A mechanical bypass valve is disposed between the inlet and outlet ports and enabled by a movable biased feature which moves based on inlet pressure and in which the bypass valve is closed only after inlet pressure is greater than a predetermined threshold. The bypass valve is a fail safe wherein gas regulation does not occur until the inlet pressure is sufficient to close the bypass valve. The flow regulator further includes a coolant bowl defined by a serpentine channel formed in a coolant plate as well as a balanced valve as a regulator control feature in conjunction with a weighting or loading mechanism having a diaphragm.

Abstract: A sanitary outlet element is provided which is insertable, via its insert housing, into the water outlet of a sanitary outlet fitting and has a jet regulator for shaping the exiting water jet, a throughflow-quantity regulator or a throughflow restrictor is arranged in front of the jet regulator, on the inflow side, by which the quantity of water flowing through per unit of time is adjusted, or limited, to a set value. The throughflow-quantity regulator or restrictor is guided in a displaceable manner in the insert housing by the flow-restrictor or regulator housing and is movable, counter to the restoring force of at least one restoring element, from an open position, in which the flow-restrictor or regulator housing has at least some of the water flowing around it, into a closed position, in which the water flowing to the jet regulator flows through the throughflow-quantity regulator or the throughflow restrictor.

Abstract: A flow inhibiting member that inhibits a flow of vapor is provided, between a full-tank regulating valve and a sealing valve, at a communication pipe that communicates a canister and a full-tank regulating valve of a fuel tank.

Abstract: A check valve (300) that opens and closes by causing a valve element (130) to come into contact with and separate from a valve seat (104) and thereby controls a flow of fluid that flows in through an inlet (101) and flows out through an outlet (102), having a guide portion (135) that has a fluid guide surface provided at a downside thereof, wherein the valve seat (104) has a first valve seat and a second valve seat, and the valve element (130) has a first valve portion (131) that is to be seated on the first valve seat, a second valve portion (132) that is to be seated on the second valve seat, and a pressure receiving surface (134) that extends between the first valve portion (131) and the second valve portion (132) in such a manner that a distance between the pressure receiving surface (134) and the first valve seat gradually reduces.

Abstract: A linear compressor is provided that may include a shell in which a discharge port is provided, a cylinder disposed in the shell to define a compression space for a refrigerant, a piston disposed to be reciprocated in an axial direction within the cylinder, a discharge valve disposed on or at one side of the cylinder to selectively discharge the refrigerant compressed in the compression space, the discharge valve including an insertion protrusion, and a valve spring coupled to the discharge valve to provide a restoring force to the discharge valve. The valve spring may include a spring body having a central portion defined at a portion corresponding to a center of the cylinder, and an insertion hole defined in the spring body. The insertion hole may be coupled to the insertion protrusion of the discharge valve. The central portion of the spring body may be spaced apart from a central portion of the insertion hole.

Abstract: Microscale valves for use in, e.g., micropump devices, may be formed of a slitted diaphragm bonded to the interior of a valve tube. A bump in the diaphragm and/or a backward-leakage stopper may increase the breakdown pressure of the valve. A push-rod may be used to pre-load the valve membrane to thereby increase the cracking pressure.

Abstract: Embodiments of the present disclosure are directed towards a back pressure valve configured to mount in a mineral extraction system. The back pressure valve includes a body comprising a venting port coaxial with a longitudinal axis of the body, a plunger configured to be in sealing engagement with the body to seal the venting port, and a lock ring disposed about the body, wherein the lock ring is configured to automatically expand radially upon removal of a tool.

Abstract: An aeration fitting for an aquarium including a hollow outer fitting having an interior channel, a cylindrical back portion, a cylindrical front portion having a threaded outer surface, a tapered cylindrical middle portion, and a frontwardly flared outer lip. A floating ball is disposed within the interior channel of the outer fitting. A hollow inner fitting has an inner channel, a cylindrical posterior portion, a cylindrical anterior portion having a threaded inner surface, a tapered cylindrical central portion, and a frontwardly flared inner lip. A spring is disposed within the inner channel of the inner fitting. Each of the back portion of the outer fitting and the posterior portion of the inner fitting is connectable to an air hose, and the threaded outer surface of the front portion is selectively engageable with the threaded inner surface of the anterior portion within an aperture in a wall of an aquarium.

Abstract: Embodiments include a flow regulating device. The flow regulating device may include a check valve. The check valve can have a first flange, a second flange and a ball seated against a seat defined by the first flange. The check valve is in a closed position when the ball is seated against the first flange. One or more stoppers may be positioned at a distance from the first flange. A fluid may flow through a first orifice and a second orifice defined in the first and second flanges respectively, when the first check valve is in an open position. The fluid lifts the ball from the first orifice, and pushes the ball towards the second orifice. The stoppers abut the ball when the first check valve is in a fully open position.

Abstract: An one way valve comprising: a conical shaped valve seat (1); and a membrane (2) having a hole (3) that is located around the conical valve seat (1), such that a surface (60) of the valve seat (1) seals onto an inner periphery (61) of the hole in the membrane (2), wherein, in use, the membrane (2) is deflected from the surface (60) of the valve seat (1) to provide a fluid path across the membrane (2) and allowing fluid to flow from one side of the membrane (2) to the other.

Abstract: A mounting plate system for use with a prosthetic socket includes a mounting plate having a cylindrical configuration. The mounting plate includes a top face arranged to be adjacent to a distal outer periphery of the prosthetic socket and a bottom face for attachment to a prosthetic limb. An opening extends from the top face to the bottom face. A bottom recess has a cylindrical configuration and extends from the bottom face and surrounds the opening. A top recess has a cylindrical configuration and extends from the top face and surrounds the opening.

Abstract: A sanitary insert unit which is fittable on the water outlet of a sanitary outlet fitting and has a flow-restricting or control device with a flow-restricting or control element. The flow-restricting or control device or at least the flow-restricting or control element thereof is guided displaceably under pressure of inflowing water from a starting position counter to a restoring force into a flow-restricting or control position. A jet splitter is connected downstream on an outflow side of the flow-restricting or control device. The jet splitter divides the water flowing therethrough into a multiplicity of individual jets. A guide pin protrudes from the jet splitter on an inflow side. The flow-restricting or control element of the flow-restricting or control device is displaceably guided on the guide pin. The sliding path is limited between the jet splitter and a sliding stop on a pin end region of the guide pin facing away from the jet splitter.

Abstract: A valve for reducing the likelihood of ice-related blockage in a fuel cell and methods for starting a fuel cell system. The valve includes a valve plate and coupling plate that are cooperative with one another within a valve body such that flexural forces imparted to the valve plate from a pressurized fluid are transferred to localized contact surfaces between the valve plate and coupling plate. By concentrating these forces to such a localized area, improvements in the ability of the fluid to initiate and propagate a crack in built-up ice around the valve's seating region is improved. In this way, fuel cell starting in cold conditions—such as those associated with temperatures at or below the freezing point of water—is also improved.

Abstract: A leaf spring type variable valve may include a housing wherein a hinge support part may be formed at a side thereof and an opening may be formed at another side thereof, a valve cover which may be rotatably secured to the hinge support part of the housing to thereby open or close the opening of the housing, and a leaf spring which may be interposed between a leaf spring support part fixedly secured to the hinge support part of the housing and the valve cover to thereby elastically pressurize the valve cover, wherein the leaf spring has an area in contact with the valve cover.

Abstract: Elastomeric check valves for use, e.g., in small pump devices, may include a molded elastomeric valve body forming a pocket that extends from an opening at the valve inlet to a terminus inside the valve body, and having a slit extending from the terminus to a valve outlet.

Abstract: A sanitary insertion unit which has a sealing ring (1) with a sleeve-shaped extension (2), the free end region of which extension (2) has a head (3) which protrudes circumferentially and, when the extension (2) is inserted into an associated line section, can be deformed at least in regions in such a manner that the head (3) of the extension (2) is placed onto the inner circumferential wall of the line section (5).

Abstract: An aircraft check valve assembly where the fluid check valve is indexed in rotational position relative to a first duct flange and to a second opposed duct flange and to a clamping band where the check valve includes an annular check valve flange having at least one index tab extending therefrom. The index tab formed in the check valve annular flange engages a void area formed in an outer annular ridge formed in the first and second duct flanges. A clamping band holds the first duct flange to the check valve flange and to the second duct flange where the clamping band is rotationally indexed to the check valve by index fingers formed on the index tab which and extends to occupy a gap formed in a hinge point of the band clamp.

Abstract: The invention relates to a flow volume regulator (1) having at least one throttle body (2) which is composed of elastically deformable material and which is arranged in the throughflow duct (3) of a regulator housing (4) and which delimits a control gap (5) between itself and a regulating profiling provided on an inner circumferential and/or outer circumferential duct wall, the clear throughflow cross section of which control gap (5) can be varied as a result of the throttle body (2) which can be deformed under the pressure of the medium flowing through, with the regulating housing (4) bearing on its outer circumference a clamping edge region for clamping the flow volume regulator (1) between two line sections or line components which are connected to one another.

Abstract: A manifold for use with an applicator assembly is provided. The manifold includes a base having at least a first proximal extension and a distal extension. The at least first proximal extension includes an outer flange and an inner flange and defines a recess therebetween. The manifold further includes at least a first connection member securely affixed to the first proximal extension. The first connection member includes an annular flange configured to be received within the recess of the at least first proximal extension and the annular flange defines a proximal cavity. The manifold further includes at least a first seal member received within the proximal cavity between the first proximal extension and the first connection member. The seal member is configured to permit flow through the manifold in a first direction and obstruct flow through the manifold in a second direction.

Abstract: Provided is a wafer check valve assembly comprising a body having a mating side including first, second and third surfaces and a shaft groove, a tapered surface of the mating side extends from the third surface toward an inlet side of the body and from a first end to a second end of a port opening; a retainer having a mating side including fourth, fifth and sixth surfaces; and a disc with a shaft; wherein, when the body, retainer and disc are mated together: the shaft is housed between the body and the retainer and within the shaft groove, the first and fourth surfaces are proximal, the second and fifth surfaces are proximal, and the third and sixth surfaces proximal, so to define a pocket housing a gasketing material to form a seal between the body and retainer and to secure together the body, retainer, and disc.

Abstract: A scroll compressor includes a discharge valve assembly having a valve member, a valve stop supported within the compressor shell and including an aperture there through and a communication member. The communication member defines a fluid passage extending into the discharge chamber from the valve stop toward the first discharge outlet in the discharge chamber and provides fluid communication between the aperture in the valve stop and a location downstream of the valve stop. A first side of the valve member abuts the valve stop when in an open position and the valve stop provides communication between the first side of the valve member and the communication member via the aperture.

Abstract: A bi-directional pressure relief valve for a plate fin heat exchanger including an elongated heat exchanger tube having ends and a channel for the flow of a fluid from one end of the tube to the opposite end and a bi-directional reed valve positioned within the channel. The reed valve allows fluid to flow within the channel in either direction when a pressure differential across the reed valve is sufficient to urge the reed valve to an open position, thereby enabling the heat exchanger to be used independent of the direction of fluid flow through the heat exchanger.

Abstract: There is provided a seat assembly for use in a downhole oil pump ball valve. The assembly includes a seat, a seat rest, and a ball. The seat is used for seating the ball of the ball valve. The seat has an outer wall and a top surface and a curved shoulder surface between the outer wall and the top surface. The seat rest receives the seat, and the seat rest has a curved corner surface so that when the seat is assembled with the seat rest the seat and seat rest are in substantial contact at all points of the curved shoulder surface and the curved corner surface.

Abstract: A compressor includes a shell, a compression mechanism supported within a suction pressure region of the shell and including a discharge outlet in communication with the discharge chamber, and a discharge valve assembly. The discharge valve assembly includes a valve member, a valve stop including an opening therethrough, and a communication member defining a fluid passage and extending into the discharge chamber from the valve stop toward the discharge outlet in the discharge chamber to provide fluid communication between the opening in the valve stop and a location downstream of the valve stop.

Abstract: A check valve is shaped and dimensioned to be installable inside a conventional pipe coupling, thereby reducing the amount of length required to install the check valve.

Abstract: A valve assembly includes first and second conduits having respective first and second flanges in abutment with each other, a stopper in the second conduit, and a valve body secured between the first and second flanges. The valve body includes a body bore in communication between the first and second conduits. The body bore defines a circular opening in one end of the valve body. The valve body also includes a circumferential notch that substantially insulates the circular opening from distortion arising from securing the valve body. The stopper snuggly seats against the circular opening to prevent fluid flow from the second conduit to the first conduit, but unseats to permit fluid flow from the first conduit to the second conduit. An o-ring may surround a portion of the valve body and be energized as the valve body is secured. A lip may surround the circular opening to provide a seat for the stopper.

Abstract: Valve-to-fitting converter that mounts on the body of an existing valve in a piping system in place of the actuator for the valve and has a dam that mates with a weir in the valve body to block flow between sections of piping connected to the valve body, and ports that provide communication between the sections of piping and fittings connected to the converter. With such converters replacing two or more of the valves in a system, sections of piping can be isolated and/or re-routed without having to shut down the entire system for an extended period of time.

Abstract: A check valve adapted for mounting between any flanges and specifically between sanitary flanges in a piping system, the check valve comprising a stationary portion and a flexible portion; the single-piece rigid stationary portion including and supporting a valve seat; the single-piece molded elastomeric flexible portion including a flange gasket, a valve plug, flexible retaining arms for guiding and securing the valve plug movement with respect to the valve seat, and a visual means to indicate that the check valve is installed, permits flow in the desired direction, and is drainable; the check valve being fully cleanable and sterilizable in situ by flow-through methods and having at least one embodiment that is fully drainable when mounted in any orientation.

Abstract: A check valve adapted for mounting between any flanges and specifically between sanitary flanges in a piping system, the check valve comprising a stationary portion and a flexible portion; the single-piece rigid stationary portion including and supporting a valve seat; the single-piece molded elastomeric flexible portion including a flange gasket, a valve plug, flexible retaining arms for guiding and securing the valve plug movement with respect to the valve seat, and a visual means to indicate that the check valve is installed, permits flow in the desired direction, and is drainable; the check valve being fully cleanable and sterilizable in situ by flow-through methods and having at least one embodiment that is fully drainable when mounted in any orientation.

Abstract: The present invention generally relates to a flow-actuated valve for use in a wellbore. The invention includes a body having a closing member and a seat. The closing member and seat are separable to open and close the valve, thereby allowing the flow of fluid through the valve. The invention further includes a retainer to initially retain the valve in the open position absent a predetermined fluid flow rate in a first direction for a predetermined time period. A biasing member thereafter urges the valve to the closed position, absent another fluid flow rate in the first direction.

Abstract: A novel apparatus and system for developing a pressure differential in a gas flow line is provided. The apparatus comprises a flange-supported plate having a flow port formed therethrough and a pressure control valve mounted thereon for controlling flow through the port. The valve is positioned inside the gas flow line and the plate is of such dimensions so as to direct substantially all of the line's gas flow through the flow port and valve. The system comprises at least one flanged connection in the gas flow line and the apparatus, as described above, inserted into the line at the flanged connection. In another embodiment the system further comprises a well inlet separator, a gas meter and a liquid level control with a dump line downstream of the gas meter. The flanged connection is located downstream of the well inlet separator and upstream of the dump line.

Abstract: It comprises a body provided with an inlet and an outlet; a moving gate which separates said inlet and said outlet; a seat formed on said body and adapted for said gate to rest against it; hinge means of the gate to the body of the valve; and means for keeping the gate in position against the seat, the latter comprising a body attached to one end of the gate, the gate and said body being hinged to the valve body in such a way that both can rotate around a single hinge pin, which is arranged eccentrically with respect to said body attached to the gate, so that the gate is kept in equilibrium when the pressure inside the valve exceeds 0.1 bar. The pin is aligned with the point of contact between the gate and the seat of the valve body and is detachable.