34results about "Check valves" patented technology

An exemplary device and method for microfluidic transport is disclosed as providing inter alia a passive check valve (100), a fluid inlet channel (210), a fluid outlet channel (220) and a pumping cavity (240). The fluid inlet channel (210) is generally configured to flow a fluid through the check valve (100). The check valve (100) generally provides substantially passive means for preventing or otherwise decreasing the incidence of purged outlet fluid re-entering either the pumping cavity (240) or the fluid inlet channel (210). Accordingly, the reduction of backflow generally tends to enhance overall pumping performance and efficiency. Disclosed features and specifications may be variously controlled, adapted or otherwise optionally modified to improve micropump operation in any microfluidic application. Exemplary embodiments of the present invention representatively provide for substantially self-priming micropumps that may be readily integrated with, for example, existing portable ceramic technologies for the improvement of device package form factors, weights and other manufacturing and/or device performance metrics.

An interior-mountable pressure relief valve for packages containing food products such as coffee that normally tend to out-gas. The relief valve of the present invention can be made by thermoforming a pocket of a barrier type of semi-rigid film that has a heat seal membrane on one side. An indent can be made in the bottom of this pocket to receive a filter medium that covers an aperture in the bottom of the pocket. The filter medium can be heat-staked to the pocket. A pressure relief valve known in the art containing a base layer, a pair of rails and a flexible membrane can be placed in the pocket. This valve and pocket assembly can be can be treated with a mesh membrane that is heat sealable to the seal side to prevent disassembly or contamination. The product can then be wound on a level wound spool for shipping to an end user. The end user can take the carrier tape and dispense it into a single piece dose and then heat seal the carrier to the inside wall of the package.

The invention discloses a check fire valve for a flue, comprising a lampblack channel comprising an outer casing. The lampblack channel is provided with an air inlet and an air outlet which are opposite to each other; two oppositely arranged valve plates are arranged in the lampblack channel; and are rotatablely arranged in the lampblack channel through a valve plate rotation shaft; a blocking body causing the two valve plates only to be opened towards the direction of the air outlet is arranged at one end near the air inlet in the lampblack channel; a connecting strip lengthways arranged to separate the air inlet to two parts is arranged at the side near the air inlet in the lampblack channel; the valve plate rotation shaft is arranged close to the connecting strip; and the side face of the connecting strip facing to the air outlet is provided with a high-temperature closing device which can enable the valve plates to be forcibly closed. The invention has good lampblack removing effect, can not impede the smoothness of public flues, and can be forcibly closed when temperature of flue gas in the public flues is in a high exigent condition.

A food and beverage industry membrane valve structure with a membrane which separates a control compartment from a product compartment in a food or beverage handling or processing machine. The abstract of the disclosure is submitted herewith as required by 37 C.F.R. §1.72(b). As stated in 37 C.F.R. §1.72(b): A brief abstract of the technical disclosure in the specification must commence on a separate sheet, preferably following the claims, under the heading “Abstract of the Disclosure.” The purpose of the abstract is to enable the Patent and Trademark Office and the public generally to determine quickly from a cursory inspection the nature and gist of the technical disclosure. The abstract shall not be used for interpreting the scope of the claims. Therefore, any statements made relating to the abstract are not intended to limit the claims in any manner and should not be interpreted as limiting the claims in any manner.

The present flow rate safety valve comprises a valve body, a valve seat, a valve core and a spring. The valve core is an open cylinder. A sealing washer is set up on the front end of the valve core. Part of the rim of the sealing washer contacts the inner wall of the valve body, forming a seal and guiding the valve core in the axial direction of the valve body. A projecting sealing part is arranged on the valve seat, and the inner wall at the rear end of the valve core is a conical surface which extends from the rear end face to the middle part of the valve core and forms a guide for the conical sealing part. Inside an outflow pipe of the valve body, a backflow preventer is arranged in order to prevent the medium backflow.

The invention provides a through-wall antifreezing valve, which belongs to the technical field of machinery. The invention solves the current problem that since the water in the tap water pipe cannot be completely drained, the water can be easily frozen under low temperature. The through-wall antifreezing valve is mounted on a wall, and comprises a valve body with a water inlet and a water outlet, a handwheel and a valve rod, the valve rod is mounted in the valve body, the outer end of the valve rod runs through the valve body and is fixedly connected with the handwheel, the valve rod is a hollow tube, the outer end of the valve rod is provided with a drain hole which communicates with the cavity of the valve rod, a check valve is mounted between the valve rod and the water inlet of the valve body, and a back siphonage valve is mounted close to the water outlet in the valve body. The through-wall antifreezing valve has the advantages of simple structure and good antifreezing effect, and is convenient to use.

The invention discloses a lifting check valve which comprises a valve body, a valve cover, a valve flap and is characterized in that the section of the valve flap is inverted T-shaped; a guide groove is arranged on the valve cover; the top part of the valve flap is arranged in the guide groove and matched with the guide groove; the check valve has the advantages of good seal performance, erosion resistance, safety, reliability, long service life and being adjusted according the flow rate of the medium real-timely.

A sleeve valve including a permanent end position and comprising an inner sleeve concentrically disposed within an outer sleeve comprising at least one radially facing outer opening and an operating range defined by an open position in which the inner sleeve does not block the outer opening, and a closed position in which the inner sleeve blocks the outer opening. The inner sleeve is axially displaceable or rotatable within the outer sleeve to provide an operating range in the longitudinal direction or an operating range in the form of an angle. At least one plastically deformable locking area of one the inner or outer sleeve is adapted for being radially deformed into a locking groove of the other sleeve when the inner sleeve is moved outside of the operating range.

The invention discloses a low pressure drop check valve. The low pressure drop check valve comprises a tubular valve body and a valve clack. A lug is arranged on one end of the upper surface of the valve clack; the lug is connected to a bracket rod arranged on the upper wall of an inner cavity of the valve body through a horizontally arranged pin roll; the axis of the pin roll is vertical to a vertical plane of the axis of the valve body; a valve clack seat is arranged in the inner cavity of the valve body; the outer edge of the valve clack seat is hermetically connected to the wall of the inner cavity of the valve body in a surrounding manner; a through hole is formed in the middle of the valve clack seat; the valve clack rotates around the pin roll to hermetically close or open the through hole; the plane of the valve clack seat inclines to the horizontal plane of the axis of the valve body and is vertical to the vertical plane of the axis of the valve body; and the valve clack seat inclines toward the inlet end of the valve body. Compared with the prior art, the low pressure drop check valve disclosed by the invention has the advantages of simple and compact structure and good sealing property, and can be quickly opened when the front and back pressure difference of the valve is smaller.

A fluid container includes a fluid storing main body and at least one check valve. The fluid storing main body includes two fluid storing films overlapping with each other, to form at least one fluid storing cell having a fluid storing chamber. The check valve includes two valve films overlapping with each other. Each valve film has outer and inner extending portions integrated formed with each other. The two inner extending portions and the fluid storing films overlap with each other and are connected between the two inner extending portions to form a fluid filling channel, so as to fill fluid to the fluid storing chamber of each fluid storing cell via the fluid filling channel. After the fluid filling is finished, the pressure of the fluid storing chamber acts on the two valve films to close the fluid filling channel, so as to avoid fluid leakage.

A re-closable valve (1, 100, 700, 800) for use in sterile fluid transfer has a body (5) with open entry and exit sides (2, 3) and a passageway (4) for fluid therebetween. The entry side is connectable to an opening of a separate vessel and the exit side is connectable to downstream processing. The entry side includes a first rupturable seal (5b, 500) blocking the opening of the entry side. A piston (9) is connected to an actuator (7) via a cam mechanism (8, 85, 10) which moves the piston (9) axially in the passageway (4) and to the first seal (5b, 500). On movement of the piston (9) during a first actuation, the first seal (5b, 500) is torn free from the entry side to open the valve for fluid transfer. A sharp rim (15) surrounds the opening of the entry side and a curved surface area (193) encircles the piston exterior proximal the entry side. The valve (1, 100, 700, 800) can be re-closed by moving the piston (9) during a subsequent actuation thus engaging the sharp rim (15) with the curved surface area (193) which plastically deform to from a second seal. Arrangements are included to enable the valve (1, 100, 700, 800) to be multiply re-opened and re-closed, if desired.

A piston assembly for a door closer includes a piston formed with a mounting hole and a door closer valve installed with clearance in the mounting hole. The door closer valve has a body part with first and second formations at opposite respective ends of the body part for engaging opposite respective sides of the piston and retaining the valve in the mounting hole. The body part is movable in the mounting hole axially of the mounting hole. The first formation is a protruding flange for seating against the piston at the first side thereof around the mounting hole and creating a seal around the mounting hole.

The invention discloses an electromagnetic type separating valve which comprises a separating valve main body, wherein the separating valve main body is internally provided with an air inlet channel and a nitrogen discharge channel; one end of the nitrogen discharge channel is communicated with a molecular tower; the other end of the nitrogen discharge channel is communicated with a nitrogen discharge port in the separating valve main body; and a one-way valve only allowing materials to get out is arranged outside the nitrogen discharge port, and is movably connected with the separating valve main body. The invention discloses a method for increasing the life of an oxygen making machine. The electromagnetic type separating valve is mounted in the oxygen making machine. When the oxygen making machine does not works, the one-way valve exerts a sealing function, external greasy dirt and damp air can not enter a nitrogen storage cavity through the nitrogen discharge port and the molecular tower to be contacted with a molecular sieve, so that the service life of the molecular sieve is prolonged, then the life of the oxygen making machine is increased. When the oxygen making machine works, the one-way valve is opened, the nitrogen discharge function of the oxygen making machine is met, and both sealing and nitrogen discharge functions are exerted. The electromagnetic type separating valve and the method for increasing the life of the oxygen making machine have the advantages that the structure is simple, the concept is ingenious and the life of the oxygen making machine is increased effectively.

The invention discloses a check valve allowing external adjustment of closing positions of a valve plate. The check valve allowing external adjustment of the closing positions of the valve plate comprises a valve body, the valve plate and a valve plate limitation rod; the internal wall of the valve body is provided with an upper protruding sealing surface and a lower protruding sealing surface; the upper protruding sealing surface, the lower protruding sealing surface and the sealing surface of the valve plate are closed; designing the calve body wall at the position of the lower protruding sealing surface to be externally concave and convex; a threaded hole which is used for installing the valve plate limitation rod is formed at the bottom of a groove; the sealing surface end of the valve plate limitation rod is provided with an inclined surface with small top and large bottom; the other end of the valve plate limitation rod is provided with a connecting rod which is provided with threads and fastened on the external of the valve body through a lock nut. An O-shaped sealing ring is arranged on a valve plate limitation rod portion which is arranged inside the groove. The check valve allowing external adjustment of the closing positions of the valve plate has the advantage of enabling the closing positions of the valve plate to be adjusted outside the valve through a limitation device due to the fact that the limitation device is arranged on the valve body, enabling the valve to be reliably sealed when the valve is abraded after long time utilization due to adjustment outside the valve and enabling troubles of disassembling the valve from channels and reinstalling to be avoided.

The invention discloses a right angle type check valve, which comprises an upper cover, a spring, a valve core, a valve base, a valve body, an inlet end and an outlet end. The valve body and the upper cover are fastened; the spring is arranged in the upper cover; the valve core is arranged at the left side of the spring; the valve core is butted against the valve base arranged on the valve body; the inlet end is arranged at the left side of the valve base; the outlet end is arranged at the lower part of the valve body. The right angle type check valve controls the moving of the valve core, so that when liquid flows through, the pressure loss is little; when the liquid is reversely obstructed, the right angle type check valve is excellent in tightness, flexible in action, and stable and reliable in work; in addition, the right angle type check valve is simple in structure, and low in manufacturing cost.

A valve assembly adapted for use in oil and gas operations. In one aspect, the valve assembly includes a valve body defining an internal region, an inlet passageway, and an outlet passageway, the inlet and outlet passageways extending into the internal region; a valve seat connected to the valve body and defining a fluid passageway; a clapper extending within the internal region and defining an annular groove; and a seal extending within the annular groove of the clapper and adapted to sealingly engage the valve seat. In an example embodiment, the clapper is actuable between an open configuration, in which fluid flow is permitted through the fluid passageway; and a closed configuration, in which the seal sealingly engages the valve seat to at least partially restrict fluid flow through the fluid passageway.

The invention provides a pressure-reducing pressure-stabilizing and constant-pressure starting valve for fire fighting. The pressure-reducing pressure-stabilizing and constant-pressure starting valvecomprises a valve body, a valve cover, a first valve cavity, a second valve cavity, a pressure reducing adjusting mechanism, a constant-pressure adjusting mechanism and a check valve element, whereinthe two ends of the valve body are detachably connected with the valve cover and a connecting seat respectively, the first valve cavity is formed by the valve cover and the valve body, the second valve cavity formed by the valve body and the connecting seat, the pressure reducing adjusting mechanism is arranged in the first valve cavity, the constant-pressure adjusting mechanism is arranged in thepressure reducing adjusting mechanism, and the check valve element is arranged in the cavity of the connecting seat. According to the pressure-reducing pressure-stabilizing and constant-pressure starting valve for fire fighting, the constant-pressure starting valve is arranged through the pressure reducing adjusting mechanism and the constant-pressure adjusting mechanism, the starting valve is opened slowly, and when the stable pressure is reached, the opening action is completed, and no instant overpressure explosion hazard is generated; the opening degree of an automatic adjusting valve element is kept constant in the pressure reduction process, and the output stability of a fire extinguishing medium is ensured; through the arrangement of the check valve element, the fire extinguishingmedium is prevented from flowing back into the starting valve, the sealing of the fire extinguishing medium is kept, and the storage is safe; and due to the arrangement of a low-leakage high-sealing valve, the starting valve is ensured not to act.

An improved ball valve on a pump system comprising a ball valve having a ball, a first end arranged for operatively engaging the pump system, a first axial port on the first end sufficiently narrow to prevent the passage of the ball, a ball-seat disposed on the first end with a plurality of ports annularly disposed around the ball and extending through the ball-seat, a second axial port on a second end sufficiently narrow to prevent the passage of the ball, and the second end of the ball valve arranged for connecting to the pump system. The improved ball valve further comprising a ball seat without a first axial port. The improved ball valve further comprising a plurality of ports extending outwardly from the first axial port and extending through the ball-seat.

The invention discloses a composite flow valve with a composite material valve base, which comprises the valve base, a valve core, a valve core guide rod, a pressure springs, a fluid intake valve inlet and a flow discharge valve outlet, wherein the valve base consists of an external valve base shell and an internal liner body; the inside surface of the external valve base shell is lined with the internal liner body, and the external valve base shell and the internal liner body are tightly combined to form a composite material. The internal liner body with a certain thickness has a fluid contact surface; and the internal liner body of the valve base can be made of corresponding materials according to different use requirements on the composite flow valve. The external valve base shell of the valve base is made of a pressure resistant material and does not contact with the fluid directly; and the force applied on the internal liner body is transferred to the external valve base shell, so the overall mechanical property is reliable. The valve base of the composite flow valve with the integrated composite structure can meet pressure and flow rate requirements and requirements on high working temperature and the like, and has low cost.

An adapter system for a check valve which comprises a housing open at the bottom and a lateral wall pierced by a hole, and a flap fitted inside the housing and movable between a shut-off position in which the flap shuts off the hole and a free position in which the flap does not shut off the hole. A plug is provided for being inserted into the hole through an end face and a stop is provided for being placed against the lateral wall of the housing opposite the lateral wall pierced by the hole and comprising an attachment device provided for attaching the stop to the housing and provided so that the plug comes to rest against the stop. Such an adapter system may be installed without it being necessary to dismantle the housing.