43 results about "Check valve" patented technology

The system comprises a main network (2) situated downstream from a check valve (1) that supplies the sensors, for example, in the form of sprinklers. This main network (2) is subdivided into secondary networks (21, 2″, 2′″), each secondary network being isolated from the main network (2) by a valve (6, 6′, 6″) that enables water to be prevented from entering the portions of the network in which it is not needed. The valve is capable not only of compensating for losses in pressure in the network but also for opening itself completely when a fire is detected.

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.

The present invention provides a novel construction for a catheter that includes backflow prevention in the form of a check valve, which keeps the flow of drained fluid material from reentering the patient. The catheter construction of the present invention provides a standard single or multiple lumen tube assembly that extends rearwardly from the insertion end of the catheter to the contact end wherein on the discharge lumen a one way check valve is provided. It is an important feature of the present invention that the check valve is provided as close to the terminal end of the contact end as possible without interfering with the necessary accessory attachment that is typically made thereto. Further, an interlock mechanism may be provided at the terminal end of the catheter for connecting accessories in a positive locking manner. The combination of the valve and the interlock mechanism provides a notable safety and performance improvement that has been previously unknown in the prior art.

The invention provides an adaptive variable compression engine piston, relating to an engine piston. The invention is characterized in that the piston is composed of a gas mixture combustion pressure control piston lifting system, an oil filling system and a cooling system, wherein the gas mixture combustion pressure control piston lifting system comprises an upper oil chamber (4) consisting of apiston shell (1) and an upper oil pressure piston (2) and a lower oil chamber (28) consisting of the piston shell (1) and a lower oil pressure piston (17); the oil filling system comprises a connecting rod internal oil duct (22), a connecting rod small end oil groove (21), a piston pin internal oil duct (25), a piston lower support internal oil groove (27) and an oil filling check valve (16); thecooling system comprises the connecting rod internal oil duct (22), the connecting rod small end oil groove (21) which is communicated with the piston pin internal oil duct (25) and a cooling oil spray hole (24), and a cooling oil duct (8). The piston can be automatically adapted to the compression ratios of the engine under different working conditions and can greatly enhance gas mixture combustion efficiency and torque under medium and low loads.

Provided is a toilet stool having a supporting water tank for preventing wash water from continuously overflowing a wash bowl. The toilet stool includes: a tank containing a predetermined amount of wash water using a bowl tap for allowing or cutting off the flow of water according to a water level; a wash bowl including a rim water pipe to which water is supplied from the bowl tap and a rim discharge port disposed on an inner circumferential surface of a rim, the wash bowl connected to the tank through a lateral water pipe; a flapper for opening or closing an exhaust port of the lateral waterpipe and disposed under the tank; a jet pump interposed between the bowl tap and the rim water pipe and for supplying a mixture of supplied water and stored wash water to the rim water pipe; and a supporting water tank disposed in the tank and including a jet pump and a check valve for allowing wash water to flow out from the supporting water tank in one way, the supporting water tank having a wall higher than a normal water level of the tank. The toilet stool includes the supporting water tank for preventing overflowing so that when the toilet stool is clogged with human excreta or dirt, washwater can be prevented from overflowing the wash bowl.

The embodiment of the invention discloses a hydraulic system of a bulldozer. The hydraulic system comprises a hydraulic oil container (1), a check valve (2), an oil source pump (3), a working valve (4), a filter (5), a guide handle (6), a speed change valve (7), a steering brake valve (8), a speed changing box (9), a steering box (10), a lubricating valve (11), a radiator (12), a torque converter(13), a working valve (14), a charging unloading valve (15), an energy accumulator (16), a torque converter safety valve (17) and a hydraulic executive component (18). By applying the hydraulic system of the bulldozer disclosed by the invention, hydraulic energy loss can be effectively reduced, cyclic utilization on hydraulic oil is realized, energy source is fully utilized, and working efficiency of the bulldozer is improved; and meanwhile, the hydraulic system is effectively simplified, overall layout of the system is convenient, and manufacturing cost is reduced.

The invention discloses a blowout proof tire with high safety performance. The blowout proof tire comprises an outer tire, an inner tire and a hub, wherein an outer fixing steel ring and an inner fixing steel ring are arranged on the hub, the outer tire is arranged in the outer fixing steel ring in a clamping manner, and the inner tire is arranged in the inner fixing steel ring in the clamping manner; an outer cavity is formed between the outer tire and the inner tire, and an inner cavity is arranged in the inner tire; gel blocks are arranged between the inner side of the outer tire and the outer side of the inner tire, and a plurality of ventilating small holes are formed in the gel blocks; a reticular steel wire frame is inlaid on in the inner side of the inner tire, a connecting pipe is arranged at the inner parts of one sides of the inner tire and the reticular steel wire frame, one end of the connecting pipe is mutually communicated with the outer cavity, the other end of the connecting pipe is mutually communicated with the inner cavity, and a check valve is arranged on the connecting pipe in the inner cavity; a tee charging connector is arranged on the hub, and the tee charging connector is mutually communicated with the outer cavity and the inner cavity respectively.

The present invention has as an object to render a photochromic coating layer free from air bubbles and obtain a uniform layer without film thickness unevenness in the coating layer. In the prevent invention, entrained air in a coating fluid stored in a vessel of a coating unit comprising the vessel, a check valve for preventing back-flow of the coating fluid connected to the vessel, and optionally an ejection nozzle connected to the check valve; air existing inside of the check valve; and optionally air existing inside of the ejection nozzle are removed by plugging an outlet of the coating fluid existing downstream of the check valve and then rotating the coating unit on an axis of the vessel and orbiting the coating unit on a revolution axis simultaneously.

A flow path control electromagnetic valve belongs to a liquid control element. The prior art has the defects like complex structure, large occupied space, high manufacturing cost and a cross flow that possibly occurs between two water sources, etc. The flow path control electromagnetic valve of the invention is provided with two inlets and an outlet communicated with the valve cavity of a valve body part. The invention is characterized in that two check valve openings are arranged in the valve cavity; check valve plugs are arranged on the two check valve openings. One valve of the invention is provided with two inlets and one outlet, so as to have the advantages of simple structure, small volume, convenient and reliable use and operation; besides, a reverse impact or cross flow with another flow path can not occur when any flow path is accessed.

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.

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 well mouth eccentric pressurizing sleeve oil recycling mobile device of a production well is mainly composed of an articulated vehicle, an oil receiving can, an oil receiving pipe, an air compressor, an oil discharge valve, a gas pipe, an eccentric hanging mechanism, an oil return pipe and a check valve, the well mouth eccentric pressurizing sleeve oil receiving mobile device is characterized in that a production three-way flange at an upper part of a production tree is designed to be the eccentric hanging mechanism composed of an inlet air pipe hanging hole, an inlet air pipe hanging head installed at middle part of the inlet air pipe hanging hole, a gasket installed at an upper-middle part, a gas pipe connector having the check valve at the upper part and a connection hole installed at one side of the inlet air pipe hanging hole and integrated with a production three-way connection and the oil pipe hanging hole; the inlet air pipe hanging head is connected with an inlet air pipe extending into the sleeve for 100-200m; the gas pipe connector having the check valve is connected with an outtake of the air compressor installed on the articulated vehicle, a sleeve gate is connectedwith the oil receiving can installed on the articulated vehicle by the oil receiving pipe and further connected with a pipe in the well mouth by the oil return pipe and the check valve, the sleeve oil is recycled by means of air lifting, and loss of the sleeve oil is prevented.

The present invention allows the number of components to be reduced and assembly work to be easily performed. A cylinder drive manifold device that constitutes a cylinder drive apparatus is provided with a block-shaped manifold in which a plurality of holes are formed for circulating a fluid used for driving a plurality of fluid pressure cylinders. The manifold is configured such that a plurality of switching valves for supplying a fluid alternately to a first cylinder chamber and a second cylinder chamber of each of the fluid pressure cylinders are attachable. A plurality of check valves and a plurality of throttle valves are incorporated into the plurality of holes of the manifold.

A multi-branched tube has a check valve structure, a main conduit adapted to be inserted into a blood vessel with its distal end, a first port tube leading to an inner chamber in the check valve structure, and a second port tube connected to the check valve structure. A blood flow stopper balloon is mounted on an outer periphery of the main conduit at a portion closer to its distal end. The main conduit has a first guide bore and a second guide bore, which are two separate guide bores. The blood flow stopper balloon is adapted to be inflated/deflated by a pressure of a fluid supplied thereinto through the second port tube and the second guide bore. Thrombus debris or the like in the blood vessel can be drawn and removed together with the blood through the first port tube, the inner chamber and the first guide bore.

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.

The invention provides a pilot operated safety valve with independent gas source control. The pilot operated safety valve comprises a main valve and a pilot valve, wherein a buffer tank is located between the pilot valve and an independent gas source; a pressure sensor is located between the buffer tank and the pilot valve; the buffer tank and each of the pilot valve, the independent gas source and the pressure sensor are connected by a pipeline; a pressure reducing valve and a check valve are arranged on the pipeline, which is connected with the buffer tank and the independent gas source; the gas of the independent gas source enters the buffer tank through the pipeline; the gas of the buffer tank enters a lower cavity of the pilot valve from a valve shaft of the pilot valve through the pipeline. According to the pilot operated safety valve, as independent, stable, and clean gas source pressure is introduced into the pilot valve and a main valve gas chamber, the problem that a medium blocks an internal flow channel of the pilot valve is solved; the influence, caused by pressure fluctuation in the pipeline, on the valve performance is overcome; the application range of the pilot operated safety valve is expanded.

The invention discloses a lift type underground ring main unit based automatic water drainage system. The lift type underground ring main unit based automatic water drainage system comprises a lift type underground ring main unit integral structure, a water accumulating pond, a submersible pump, a middle controller, a first liquid level meter, a second liquid level meter, a third liquid level meter, a water drainage tube, a non-return valve, an audible and visual alarm, an automatic dialing device, a standby power supply, a photographic device, a client side and a foundation pit, wherein whileaccumulated water reaches the position of the second liquid level meter, a signal is transmitted to the middle controller to control the submersible pump to start, and water is extracted and discharged into an urban drainage pipeline through the submersible pump; while accumulated water reduces to the position of the first liquid level meter, the submersible pump stops work, and the non-return valve is closed; if water level rises to the second liquid level meter, the submersible pump is not started, and water level in the water accumulating pond continuously rises; while water level reachesthe third liquid level meter, the signal is transmitted to the middle controller for controlling the audible and visual alarm by the third liquid level meter, and the automatic dialing device is started for transmitting the signal to the client side, so that hidden danger of a safety accident is avoided.

The invention provides a BOG treatment system and method of LNG storage tanks applicable to different design pressures. The system is provided with the low pressure LNG storage tank and the high pressure LNG storage tank; the low pressure LNG storage tank and the high pressure LNG storage tank are converged into a BOG header pipe, are connected with a BOG buffering tank, and then are connected toa BOG compressor and a backflow air blower; a check valve is installed on a BOG pipeline of the low pressure LNG storage tank; an opening degree control valve is installed on a BOG pipeline of the high pressure LNG storage tank; the BOG header pipe is further connected with a branch circuit heading for a torque system; and a branch pressure control valve is installed on the branch circuit. By monitoring the pressure of each pipeline and controlling the BOG compressor, the system, heading for a torque, of a branch pipe, a safety valve of the low pressure LNG storage tank and a safety valve of the high pressure LNG storage tank to be opened, the equipment safety of the whole system is guaranteed.

A test-specimen holder for gripping test specimens to perform material tests in the form of compressive and tensile tests has two grabs coaxially aligned relative to each other and capable of gripping the test specimen. The grabs have angled faces on sides facing away from the test specimen gripped between them. Respective hydraulic gripping cylinders are connected to the grabs for shifting same axially and a wedge can engage the angled faces of both grabs. A fluid-operated synchronization cylinder is connected to the wedge for moving the wedge perpendicular to the axis of the grabs into and out of engagement with the angled faces of the grabs. A fluid reservoir is connected through a 4/2 directional control valve with the gripping cylinders for actuating same. An adjustable first pressure-limiting valve and a check valve connected parallel thereto are connected between the 4/2 valve and the synchronization cylinder.

The invention discloses a deoxidizing device of a heat supply system. The deoxidizing device comprises a main valve for controlling raw water to be conveyed to a boiler, wherein a water softener, a transfer pump I, a deaerator, a deoxidized water tank, an iron and manganese removing filter and a transfer pump II are sequentially arranged on a pipeline between raw material and the boiler; a series-connected pipeline formed by the transfer pump I and the deaerator is connected in parallel with a deoxidizing valve; two ends of the iron and manganese removing filter are connected with an iron removing valve; a pump I valve and a pump II valve are arranged at water inlet ends of the transfer pump I and the transfer pump II respectively; a check valve is arranged at a water outlet of the deaerator; a blow-down valve is arranged on a blow-down pipeline of the deaerator. The deoxidizing device of the heat supply system operates at the normal temperature and is convenient to operate, good in stability and high in applicability, regeneration property of sponge iron in the deaerator is good, regeneration of the sponge iron just requires backwashing, and backwashing drainage is non-toxic, non-corrosive, energy-saving and environment-friendly; the deoxidizing device is good in deoxidizing effect, and content of oxygen in water entering the boiler is 0.05 mg/L or lower.

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 provided technical scheme of the invention is a heatable mopping combination for intelligent cleaning robots. The heatable mopping combination for the intelligent cleaning robots includes a watertank combination, a mopping combination and a heating combination. The water tank combination includes a water tank bottom shell, a water tank top cover and a water intake plug; more perfectly, the water tank combination also includes a seepage control device; further, the water tank also can include a check valve. The check valve has a one-way supply for water flowing and reverse water stop. Theheating combination includes a heating component, a temperature controller, or includes the heating component, a conducting strip and the temperature controller, which can simultaneously heat the water tank and a mop support. The heating combination can also include a safety protection device. The safety protection device is a temperature fuse or a current fuse. The mopping combination includes the mop support, a mop sticking device and a mop. The heatable mopping combination for intelligent cleaning robots solves problem that the intelligent cleaning robot can maintain normal wet towing workin low temperature environment, and has a wider application range.

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.

The invention provides an eccentric two-way sealing butterfly valve. The valve seat of the butterfly valve consists of an independent floating valve seat and O-shaped seal rings on the floating valve seat to form a new sealing pair, wherein the side face and the bottom of the valve seat are provided with plastic or rubber O-shaped seal rings. The eccentric two-way sealing butterfly valve has the advantages that the valve can bear pressure (within 1.25 times the nominal pressure) which is applied by a medium from any side; and the aim of preventing the medium from reflowing can be fulfilled by arranging one eccentric two-way pressure butterfly valve on a pipeline and not arranging a check valve or other two-way pressure valves.

The invention relates to an offshore installation buffer device. The device is composed of a plunger assembly, a cylinder assembly and an energy storage assembly; the plunger assembly comprises a nylon pad, a cushion pad, a lower end cover and a plunger body; the cylinder assembly comprises a cylinder end cover, an oil passage pipe, a cylinder body, a cylinder flange, an end cover flange and an oil tube joint; a first cylinder end cover is welded on the lower end of the cylinder body, and the cylinder flange is arranged outside the cylinder body; a second cylinder end cover and an end cover flange are fixedly connected; a check valve and a speed adjustment valve are mounted on the second cylinder end cover; an oil nozzle and an air exhaust pressure measuring joint are mounted on the upperportion of the cylinder body; the oil tube joint is welded on the top of the end cover; the energy storage assembly comprises an oil pipe, a stop valve and an energy accumulator; the oil nozzle is connected to the energy accumulator through the oil pipe and the stop valve; the plunger body is located below the cylinder body, and a gap between the plunger body and the cylinder body forms a cylinderinner cavity. The device is designed according to environmental factors during installation of an offshore draught fan, has the advantages of being capable of buffer reset of multiple times in a short time, simple in structure and high in reliability, and can effectively ensure smooth soft landing of the offshore draught fan.