7108results about "Equalizing valves" patented technology

Disclosed is a fire-control gas stopping valve, comprising a valve body (1) and a valve core (2). Two ends of the valve body (1) are provided with end connecting mechanisms (3). An air inlet filtering mechanism (4) is detachably mounted at one end of a bottom part of the valve body (1). The valve core (2) comprises a first sealing plate (21), a second sealing plate (22), and a third sealing plate (24), arranged in sequence from right to left, the first sealing plate (21), the second sealing plate (22) and the third sealing plate (24) dividing an inner cavity of the valve body (1) into an air inlet portion and a float actuating portion. Thus, high-temperature flue gas generated when a fire occurs can be directly utilized to drive the float actuating portion to completely obstruct an air outlet hole. Also disclosed is an air tightness testing apparatus using the valve, which can implement fully automatic material collection, material feeding detection, and post-test sorting.

A cage-type dual wedge throttle valve, comprising: a housing having an inner cavity; a valve cover arranged at the top of the housing; a valve seat arranged in the inner cavity, wherein the valve seat comprises an outer valve seat and an inner valve seat, and a plurality of flow holes are distributed on the peripheral wall of the outer valve seat; a valve core, which comprises two wedge-shaped surfaces and two cylindrical surfaces which are axially symmetrically arranged about the central axis, wherein the cylindrical surfaces face the direction in which a fluid flows into the inner cavity, and the cylindrical surfaces can fit the inner wall of the inner valve seat; and a valve stem having the two ends respectively connected to a driving device and the valve core, wherein under the driving of the driving device, the valve stem can drive the valve core to reciprocate in the valve seat in the axial extension direction of the valve stem. By means of the above solution, primary throttling is achieved when a fluid passes through the outer valve seat, and secondary throttling is achieved as the valve core gradually extends into the inner valve seat; moreover, the valve core comprises wedge-shaped surfaces, and a long throttling stroke is formed, thereby improving the throttling switching performance of the throttle valve; the symmetrical arrangement of the two wedge-shaped surfaces can balance the pressure on the two sides, thereby improving the stability of the valve core under force.

The invention discloses a pipeline pressure relief structure and a pressure relief valve with the pressure relief structure, and relates to the field of pressure relief valves, the pipeline pressure relief structure comprises a main valve, a tower-shaped valve core, a pressure gauge, an amplification gear and a labor-saving lever, and changes the situation that in the prior art, precision of a pilot valve is adjusted through a needle valve, and the needle valve and the pilot valve need to continuously play a sensing role through similar structures such as springs; a tower-shaped valve element is arranged in a main valve to conduct multi-section control over flow, then driving force on the tower-shaped valve element is amplified in a multiplied mode through a hinge rod, an amplification gear and a labor-saving lever, accurate adjustment of the tower-shaped valve element is guaranteed, and the control precision of equipment is guaranteed. In addition, the pressure gauge is connected in the pilot valve through the oil bag, and the carry block facilitating adjustment of the elastic force of the piston by the spring is arranged, so that the pilot valve can be calibrated according to the display of the pressure gauge and the flow change of the main valve, the service life of the pressure relief valve structure is prolonged, and more accurate adjustment and use of the pressure relief structure are ensured.

The invention discloses a pressure regulating solenoid valve, which relates to the technical field of solenoid valves, and comprises a valve body, the top of the valve body is provided with a valve seat, the valve seat is internally provided with a cavity, and through the arrangement of a first pressurizing hole, a second pressurizing hole, a flow dividing hole, a first flow dividing pipeline, a second flow dividing pipeline, a first pressurizing cavity and a second pressurizing cavity, the pressure regulating solenoid valve is formed. During use, when unstable high water pressure flows into the valve body, the high water pressure pushes the inner barrel upwards, then the inner barrel moves upwards to drive the flow dividing holes to move upwards, the flow dividing holes are driven to be sequentially in butt joint with the first pressurizing hole and the second pressurizing hole respectively, and then water is divided into the first flow dividing pipeline and the second flow dividing pipeline; then water flows into the first pressurizing cavity or the second pressurizing cavity, then water pressure is dispersed, then the water flowing into the first pressurizing cavity or the second pressurizing cavity downwards compresses the first spring to cause deformation shortening, and meanwhile, a stretched second spring is matched, so that when the water pressure upwards jacks the sleeve and the inner cylinder, buffering protection on the sleeve and the inner cylinder is enhanced.

The invention discloses a flow and pressure regulating valve with a buffering effect, and relates to the technical field of flow and pressure regulating valves. Comprising a valve body, a mouse cage, a leakage detection assembly, an adjusting assembly and a filtering assembly, impurities in a medium are filtered through a filtering net on a filtering fan blade, the filtering fan blade is driven to rotate through flowing of the medium to generate centrifugal force, and the impurities are thrown out through the centrifugal force; and the filtered impurities are blocked and guided by the guide strips on the filtering fan blades, so that the impurities are thrown into the collecting tank along the guide strips, and the magnetic rings in the collecting tank adsorb and separate metal chips in the impurities, so that the purposes of filtering, collecting and separating the impurities are achieved. Leakage media are collected through the leakage cavity, the floating plate drives the contact on the supporting piece to extrude the piezoelectric ceramic in the elastic film under the action of buoyancy, buoyancy is generated through the leakage media, then the buoyancy is converted into displacement of the supporting piece, finally, the displacement is converted into an electric signal, and therefore the purpose of leakage detection is achieved.

The utility model relates to an anti-backpressure high-precision spring safety valve which comprises a valve body, a valve seat, a valve clack, a valve rod, a guide sleeve and a spring pressure setting device, the lower end of the guide sleeve is pressed at an inlet of the valve body through a radial outer step of the valve seat, and a protruding cylinder arranged on the upper portion of the valve seat is concentrically sleeved in a guide cavity of the guide sleeve. The valve clack is sleeved in the guide cavity of the guide sleeve to form a piston type dynamic sealing structure, so that the concentricity of the valve clack and the sealing surface of the valve seat can be kept, and the sealing matching performance of a sealing pair is improved; the upper end of the guide sleeve is in sealing connection with the inner wall of the spring cavity on the upper portion of the valve body, the valve clack and the spring cavity are sealed and isolated from an outlet cavity of the valve body, back pressure of outlet cavity medium pressure on the valve clack is eliminated, and influence of corrosion of media on the spring on setting pressure is avoided. The device has the advantages of high pressure setting precision, reliable sealing performance of a sealing pair and the like.

The utility model discloses an emptying valve which comprises a valve body (1) and a water outlet valve element assembly (2). The exhaust valve is characterized by further comprising an exhaust valve element assembly (4), the exhaust valve element assembly (4) comprises a valve element seat (41), the valve element seat (41) is plugged at an outlet of the water inlet channel (11) or in the backflow channel (14) of the valve body (1), a through hole (411) is formed in the middle of the valve element seat (41) in a penetrating mode, and an overflow groove (412) extending from the through hole (411) to the edge of the valve element seat (41) is formed in the surface of the side facing the water flow direction. An overflowing hole (4121) is formed in the bottom wall of the overflowing groove (412) in a penetrating manner; and the umbrella-shaped valve core (42) comprises a rod part (421) and an elastic umbrella part (422), wherein the rod part (421) can be arranged in the through hole (411) in a sliding and penetrating manner. Compared with the prior art, the blowoff valve is high in technical reliability, low in manufacturing requirement and easy to inspect.

This application relates to a liquid discharge mechanism, a battery box, a battery, and an electric apparatus. The liquid discharge mechanism includes: a valve seat having a mounting chamber; a valve core assembled on the valve seat and at least partially accommodated in the mounting chamber; and a deformation member accommodated in the mounting chamber and connected between the valve seat and the valve core. The deformation member is configured to deform after contacting a target liquid, thus causing formation of a liquid discharge channel between the valve core and the valve seat.

The invention discloses a pilot-operated type self-driving fluid release valve, and belongs to the field of control valves. Comprising a main valve assembly, a pilot valve assembly and a one-way valve assembly. Valve bodies of the pilot valve assembly and the one-way valve assembly are integrated on a main valve body of the main valve assembly; the main valve assembly comprises a main valve body, a main valve piston, a main valve element and a main valve spring. The pilot valve assembly comprises a pilot valve air control opening, a pilot valve inlet, a pilot valve outlet channel and a pilot valve pressure relief opening. The one-way valve assembly is arranged at an outlet of the main valve and used for blocking medium backflow. Through mechanical configuration reconstruction and system integration innovation, the technical contradiction of the liquid rocket engine high-pressure gas control valve in weight, response speed and reliability is thoroughly solved.

Relates to an electric control valve for semiconductor gluing equipment and an assembling method of the electric control valve. The electric control valve comprises a pre-assembled inner box which is arranged in the dustproof shell and is provided with a driving assembly and an elastic pre-tightening module in a pre-assembled mode, a sealing membrane which is provided with a semi-circular-ring-shaped arc-shaped thin film part and an inverted-cone-shaped sealing boss and is used for sealing a longitudinal valve port, and a valve seat which is arranged at the lower end of the longitudinal valve port, connected with an inlet flow channel and provided with an inner arc spherical surface. According to the electric adjusting valve, the adjusting lead screw is driven by the stepping motor to rotate so as to achieve accurate lifting motion of the diaphragm connecting shaft, the elastic pre-tightening module provides stable pre-tightening force for the diaphragm connecting shaft, and the cooling space in the dustproof shell effectively reduces the operating temperature of the stepping motor; high-precision fluid control can be achieved, and meanwhile good sealing performance and long-time use durability are achieved. The problems that in the prior art, sealing leakage occurs, a flow channel is polluted, a membrane is prone to being damaged, and environmental adaptability is poor are solved, high-precision, long-service-life and zero-pollution flow control is achieved, and the technical effect of being applied to semiconductor gluing equipment is achieved.

The invention discloses a valve device, a shock absorber, a suspension system and a vehicle. The valve device comprises a valve shell, a first valve assembly and a second valve assembly, a mounting cavity is formed in the valve shell, at least part of the first valve assembly is arranged in the mounting cavity, at least part of the second valve assembly is arranged in the mounting cavity, and the valve shell is of an integrally-formed structure. According to the valve device, the valve shell is integrally formed, and the mounting cavity is formed in the valve shell, so that the first valve assembly and the second valve assembly are at least partially arranged in the mounting cavity, and fluid can flow between the first valve assembly and the second valve assembly through the mounting cavity; fluid can be effectively prevented from leaking when flowing through the first valve assembly and the second valve assembly, and the sealing performance of the valve device is improved. Meanwhile, a connecting pipeline between the first valve assembly and the second valve assembly is omitted, so that the integration level of the first valve assembly and the second valve assembly is high, and the overall size of the valve device is small.

The low-temperature safety valve comprises a valve body shell composed of an installation section, a pressure relief section and a reset section, a pressure relief pipe is fixedly installed on the side face of the pressure relief section, a transversely-arranged partition plate is fixedly installed in the pressure relief section, a heat preservation material is arranged in the pressure relief section, and a communicating hole is formed in the middle of the partition plate; a sealing block matched with the communicating hole is arranged in the pressure relief section, a connecting valve rod is fixedly installed on the upper surface of the sealing block, and a reset spring located on the inner side of the reset section is fixedly installed at the upper end of the connecting valve rod. According to the low-temperature safety valve with the leakage alarm function, the device is integrally installed in a pipeline system through a flange structure of the installation section, when the pressure reaches a set value, the sealing block is jacked up, the purpose of automatic pressure relief is achieved, and in the process, a gas sensor outside the pressure relief section is used for detecting surrounding gas, so that whether gas leakage exists at the joint or not is judged; and a wireless signal is transmitted to a computer so as to achieve the purpose of automatic alarm.

The utility model relates to the technical field of valves, and discloses a combination valve which comprises a connecting pipe, an air inlet pipe is arranged at the bottom of the connecting pipe in a communicated mode, a sleeve is arranged at the top of the connecting pipe in a communicated mode, an air outlet pipe is arranged at the top of the sleeve in a communicated mode, and a pressure relief mechanism is fixedly installed in the sleeve. The pressure relief mechanism comprises a sealing cylinder, a mounting plate is fixedly mounted on the outer wall of the sealing cylinder, the mounting plate is fixedly mounted on the inner wall of the sleeve, a lifting column is slidably arranged on the inner wall of the sealing cylinder, a first pressing plate is fixedly mounted at the bottom end of the lifting column, and a rectangular rod moves upwards or downwards by rotating a lead screw; according to the pressure relief device, the first spring is driven to move upwards or downwards to drive the pushing plate to move upwards or downwards, so that the pushing plate compresses the first spring to different degrees, the force of the first spring pressing the first pressing plate is changed, the set pressure relief pressure threshold value is adjusted, the first spring can be protected through the sealing cylinder, and the first spring is prevented from being eroded by corrosive fluid.

A capacity control valve includes a main valve that opens and closes communication between a discharge port and a control port formed in a valve housing by movement of a rod driven by a solenoid, a CS communication passage providing communication between a control fluid supply chamber formed in the valve housing and a suction port, and an on-off valve formed by a communication passage forming member having an annular valve seat in an outer periphery of the CS communication passage and an on-off valve element biased in the valve closing direction with respect to the valve seat.

The invention relates to the technical field of pressure release valves, in particular to a fire-fighting pipeline linear adjusting pressure release valve and a method, the fire-fighting pipeline linear adjusting pressure release valve comprises a first valve body, and further comprises a third valve body, a second valve body, a third valve core assembly, a second valve core assembly and a third valve core assembly, the second valve body is fixedly connected to the top of the third valve body, and a second valve element assembly is connected to the interior of the second valve body; and the pressure regulating mechanism comprises a pressure assembly communicating with the water outlet end of the first valve body, and the top of the second valve body is connected with an elastic assembly. By arranging the pressure adjusting mechanism, a traditional single spring adjusting mode is broken through, the water pressure in the sealing cover and the mechanical pressure of the adjusting screw rod and the first spring are superposed to form a composite pressure relief threshold value, and a method for linearly and finely adjusting the pressure relief threshold value is added; incompressibility of a water medium is utilized, instantaneous pressure fluctuation is absorbed, fatigue failure of the spring under high-frequency impact is effectively avoided, and the device is suitable for starting and stopping of a fire pump or scenes where water hammers frequently occur.

The utility model belongs to the technical field of control valves, and discloses a novel valve seat sleeve of a large-pressure-difference regulating valve, which comprises a regulating valve seat body, an anti-erosion WC (Wolfram Carbide) valve seat sleeve, a compression valve seat sleeve nut and a positioning screw. On the basis of keeping the function of the original valve seat sleeve, the WC hard alloy valve seat sleeve is embedded on the valve seat body, so that the problems of valve seat cavitation, scouring and abrasion failure caused by the use environment of a control valve adjusting core component are solved under the condition of reducing the use amount, the service life of the core component is prolonged, and the service life of the core component is prolonged. And long-period, safe and reliable operation of core components in an application environment is ensured.

The utility model provides an anti-damage gas self-closing valve with an independent safety function. The anti-damage gas self-closing valve comprises a gas self-closing valve body. A pressure regulating assembly, an overflowing assembly and a resetting assembly are arranged in the gas self-closing valve body; the voltage regulating assembly and the over-current assembly are independently arranged; the pressure regulating assembly is movably arranged in the gas self-closing valve body, reciprocates along with the change of the pressure in the valve cavity, and seals the gas inlet of the gas self-closing valve body when the valve cavity is overpressure or underpressure; the overflowing assembly is movably arranged at the gas outlet of the gas self-closing valve body and blocks the gas outlet of the gas self-closing valve body when the pressure of the valve cavity is overhigh; the reset assembly is rotationally arranged on the gas self-closing valve body in a sealed mode and extends into the gas self-closing valve body, and the reset assembly is used for driving the overflowing assembly to reset. The pressure regulating assembly and the overflowing assembly are independently arranged, when the pressure regulating assembly is forcibly fixed to shield the pressure self-closing function of the self-closing valve, the overflowing assembly is continuously closed, the overflowing protection function of the gas self-closing valve body still works normally, and gas use safety is ensured.

The utility model discloses an overflowing cut-off gas cylinder valve which comprises a valve body, an upper cavity channel and a lower cavity channel which are divided by a valve seat are arranged in the valve body, a transverse gas outlet communicated with the upper cavity channel is formed in the side portion of the valve body, an overflowing cut-off mechanism is installed in the gas outlet, and the overflowing cut-off mechanism comprises a core seat connected with the gas outlet in a sealed mode. The core seat is provided with a through air outlet channel, a valve seat opening is formed in the air outlet channel, and a ball used for blocking the valve seat opening and a first spring keeping the ball moving towards the valve seat opening are installed in the air outlet channel in a clearance fit mode. The overflowing cut-off mechanism is installed at the gas outlet of the gas cylinder valve, when a gas using pipeline is abnormally damaged, the gas flow and the flow speed in the pipeline are suddenly increased, the gas flow with the flow speed and the flow suddenly increased pushes the ball to overcome the first spring to move towards the valve seat opening, the valve seat opening is blocked, and gas leakage is cut off.

The invention provides a double-row low-temperature safety valve and relates to the technical field of safety valves, the double-row low-temperature safety valve comprises a main valve body, a valve cover and a pilot valve assembly, an inlet runner and an outlet runner are arranged in the main valve body, a guide sleeve is arranged in the main valve body, a first valve element is arranged in the guide sleeve in a sliding mode, and a valve seat is arranged in the main valve body; a first sealing piece is arranged at the lower end of the first valve element, a medium containing cavity is formed between the first valve element and the valve deck and located in the guide sleeve, the pilot valve assembly is communicated with the medium containing cavity and the inlet flow channel, and the first sealing piece and the valve seat can elastically deform. The medium containing cavity is filled with media to form pressure towards the valve seat on the first valve element, so that the first sealing piece extrudes the valve seat. According to the safety valve, the first valve element and the valve seat can both deform, the sealing performance of the valve seat and the first valve element under the low-temperature working condition is guaranteed, and the sealing performance between the first valve element and the guide sleeve is remarkably improved.

The invention discloses a pilot valve for hydraulic adjustment, and relates to the technical field of pilot valves, the pilot valve comprises a main valve sleeve assembly, an electromagnet assembly and a coil assembly which are assembled in sequence, the electromagnet assembly comprises a shell and a driving shaft, the driving shaft is assembled in the shell in a sliding mode, and the main valve sleeve assembly comprises an end cover, a main valve sleeve, a main valve element, a front valve element, a main spring seat and a pilot valve element. The main valve sleeve is fixedly installed in the shell, the end cover is in interference fit with the end, away from the shell, of the main valve sleeve, the main valve element is slidably assembled in the main valve sleeve, the front valve element is slidably assembled in the main valve element, the main spring seat is slidably assembled in the front valve element, and one end of the main spring seat movably penetrates through the front valve element to be in threaded connection with the end cover. A main elastic piece is assembled between the main spring seat and the front valve element, the pilot valve element is assembled between the main valve element and the driving shaft in a sliding mode and located on the moving path of the driving shaft, and a pilot elastic piece is assembled between the pilot valve element and the main valve element. Assembly is easy, machining difficulty is reduced, mass production is facilitated, and cost is reduced.

The invention provides a special multifunctional valve for a high-pressure oil tank of a hybrid vehicle, which comprises an upper cover fixedly connected with the high-pressure oil tank, and a lower shell positioned in the high-pressure oil tank and provided with a first accommodating cavity and a second accommodating cavity; the connecting piece is connected between the upper cover and the lower shell; the refueling control valve assembly is arranged in the first containing cavity of the lower shell and can float up and down in the first containing cavity, and the refueling amount is controlled. The gradient exhaust assembly is arranged in the second containing cavity of the lower shell and can float up and down in the second containing cavity to achieve exhaust. And the oil supplementing and filling control valve assembly is arranged on the connecting piece above the gradient exhaust assembly and used for controlling the oil filling amount during oil supplementing and filling. The valve integrates various control functions such as oil filling, oil supplementing, gradient exhaust and liquid collecting, the floater adopts the noise reduction design, noise is reduced, the oil filling control valve and the gradient exhaust adopt the second-order opening design, and large-range pressure relief control can be achieved within a short time.

The invention provides a pilot operated safety valve with filtering and field testing functions, which relates to the technical field of pressure relief valves, comprises a pilot operated valve body, a main valve and a valve core, and is provided with a filtering mechanism and a flow testing mechanism. The filtering mechanism comprises a filter screen assembly and a sealing assembly movably installed in the filter screen assembly, an insertion hole communicated with the interior is formed in the side wall of the main valve and used for embedding the filter screen assembly, and the sealing assembly is automatically switched to a first state when liquid flows, blocks a gap between the filter screen assembly and the insertion hole and starts the flow testing mechanism; when the liquid stops flowing, the second state is switched, and blockage is relieved so that the filter screen assembly can be taken out and the flow testing mechanism can be closed. The flow testing mechanism is located downstream of the filter screen assembly and used for detecting the liquid flow. According to the design, integration of the filtering function and the flow testing function is achieved, operation, maintenance and testing are convenient, the sealing performance and the operation efficiency of the system are improved, and the system is suitable for fluid control and monitoring under complex working conditions.

The invention discloses a vacuum breaker device with a self-adaptive variable stroke and an anti-backflow function, and relates to the technical field of valve switches, the vacuum breaker device comprises a valve body and an anti-siphon assembly, a flow channel, an inlet, an outlet and a supplementary air inlet are formed in the valve body, and the inlet, the outlet and the supplementary air inlet are communicated with the flow channel; the anti-siphon assembly comprises a first sealing core, a second sealing core and an elastic piece, and the first sealing core is connected with the second sealing core through the elastic piece, so that the vacuum breaker device has an initial state, a positive pressure state and a siphon state; in an initial state, the first sealing core blocks the air supplementing inlet, and the second sealing core blocks the inlet; in a positive pressure state, the first sealing core blocks the supplementary air inlet, and the inlet communicates with the outlet; in a siphon state, the second sealing core blocks the inlet, and the supplementary air inlet communicates with the outlet; according to the technical scheme provided by the invention, the structure of the vacuum breaker device can be simplified, and meanwhile, the self-adaptability of the vacuum breaker device under different working conditions is improved.

The invention relates to the technical field of hydrogen release, and discloses a release device and hydrogen storage equipment, the release device comprises a release body, a combustion suppression part and a blasting part, a pressure release channel is arranged in the release body, the release body is further provided with a first opening and a second opening which communicate with the pressure release channel, the combustion suppression part is arranged in the pressure release channel, and the blasting part is arranged in the first opening. A combustion suppression gas is stored in the combustion suppression part, the blasting part is fixedly arranged in the pressure relief channel, located between the first opening and the combustion suppression part and used for blocking the pressure relief channel, and at least part of the blasting part is constructed to be opened when the pressure applied to the blasting part by the hydrogen to be released is larger than a preset value. The opened part of the blasting piece is suitable for puncturing the combustion suppression piece to enable the combustion suppression gas to flow out, and the combustion suppression piece is discharged through the second opening and the discharge pipeline in sequence under the action of discharged hydrogen. Therefore, the risk of spontaneous combustion caused by hydrogen discharge is effectively inhibited, and the safety of surrounding personnel and equipment is guaranteed.

The invention belongs to the technical field of automobile shock absorber electromagnetic valves, and particularly relates to a hydraulic shock absorber electromagnetic valve for vehicle testing, which controls whether a liquid inlet hole is directly communicated with a main liquid cavity or not through an elastic valve plate, and controls whether the main liquid cavity is communicated with a liquid outlet hole or not through a pressurizing seat. The pressure of oil entering the liquid inlet must overcome the tension of the elastic valve block, the supporting force of the elastic supporting piece can push the elastic valve block and the pressurizing base to move in the direction away from the main valve body, then the oil can flow back to the shock absorber through the liquid outlet hole, and the resistance borne by the oil in the electromagnetic valve is increased. And large damping force is provided for the vibration damper. By arranging the pressurizing cavity, when the electromagnetic coil is powered on, the pilot valve element blocks the overflow hole, oil in the overflow hole applies pressure to the pressurizing base, the oil does not easily push away the pressurizing base and the elastic valve block in the direction away from the main valve body, and oil resistance is further increased. The electromagnetic valve consumes less electric energy, and the vehicle research and development test efficiency is improved.

The invention relates to the technical field of gate valve equipment, and discloses a meter-front copper gate valve with a magnetic lockable structure, which comprises a valve body which is used as a basic component of the whole device and is used for assembling and bearing all mechanisms and subordinate lower structural parts; the valve basic mechanism is arranged on the valve body and used for being matched with other structural parts to execute basic operation treatment of the valve; and the locking protection mechanism is arranged at the upper part of the valve body. By adding and arranging an extreme protection mechanism, under the extreme working condition, a thermosensitive alloy sleeve of the mechanism expands in a high-temperature environment to push a locking pin rod to be inserted into a valve rod locking hole, a valve rod is mechanically locked, and fluid leakage caused by high-temperature damage of the valve under the extreme conditions such as a fire disaster is prevented; after the temperature is reduced, the pin rod is automatically reset, locking is relieved, follow-up normal operation is not affected, the valve body can be actively protected under the extreme working condition through the treatment mode, and the accident risk is prevented from being increased due to valve failure.

The invention relates to the technical field of valve bodies, and provides a pressure reducing valve with emergency shutoff and backflow prevention functions, which comprises a main valve body, a main valve membrane and a valve core assembly, the main valve body comprises a valve cavity with a water inlet end and a water outlet end, and the main valve membrane is arranged in the valve cavity and divides the valve cavity into a control cavity and an overflowing cavity; the pressure reducing valve is in a pressure reducing dynamic adjusting state, when the pressure reducing valve is in the pressure reducing dynamic adjusting state, the shut-off reversing valve changes the position so as to close the pressure reducing pilot valve to be communicated with the water outlet end, and the pressure reducing valve is switched to an emergency shut-off state so as to be closed. When the pressure reducing valve is in the pressure reducing dynamic adjusting state, the anti-backflow reversing valve changes the position to close communication between the water inlet end and the control cavity and enable the water outlet end to communicate with the control cavity, and the pressure reducing valve is switched to be in the anti-backflow state so as to be closed. The problem that in the prior art, downstream leakage or backflow of a traditional pressure reducing valve cannot be blocked in time is solved.

To provide a novel cam action hydraulic door closer particularly, in a technical field of a door closer.SOLUTION: Omitting a gear and a rack structure greatly simplifies the structure and volume of a door closer. A bidirectional piston always abuts in an elastic manner on an outer circumferential surface of a transmission camshaft through a driving spring. When the transmission camshaft operates, the bidirectional piston moves in conjunction therewith, the driving spring is compressed, and the driving spring stores force. At the same time, an overload valve realizes a circulation of hydraulic oil between a spindle chamber and a spring chamber. Therefore, when the transmission camshaft rotates in a door closer housing, the bidirectional piston is subjected to damping effect on the transmission camshaft and the damping effect of hydraulic oil. This reduces the instantaneous speed when the door is closed, and a new cam action hydraulic door closer provides a sufficient cushioning effect when the door is closed. In this way, the new cam action hydraulic door closer of the present invention has the advantages including simple structure, easy assembly, high production efficiency, low failure rate, and stable performance.SELECTED DRAWING: Figure 1

A marine foundation such as a jacket or a tripod foundation for a wind turbine comprises suction piles that are subjected, in service, to cyclical loading of compression phases and tension phases in alternation. Each pile has a one-way valve that opens and closes autonomously in response to pressure differentials between the internal chamber and the surrounding water. The valve opens during the compression phases to effect fluid communication between an internal chamber of the pile and surrounding water. Water is thereby ejected from within the chamber through the valve. Conversely, during the tension phases, the valve closes and water is admitted into the pile only through soil within a skirt of the pile. Thus, a unidirectional, generally upward flow of water is driven through the soil within the skirt during the compression and tension phases, maximising water flow friction and reducing the risk of liquefaction of the soil.

The utility model discloses a diaphragm type steam pressure reducing valve, which solves the problems of low control precision, diaphragm damage and the like caused by the influence of upstream impact on a diaphragm. The control mechanism comprises a control diaphragm, a diaphragm tray and a control shell, the control shell is fixed below the main valve body, the lower end of the main valve rod penetrates through the control shell to be fixedly connected with the diaphragm tray, and the middle position of the control diaphragm is tightly attached to the diaphragm tray. The control diaphragm is installed in the control shell and divides an inner cavity of the control shell into an upper control cavity and a lower control cavity. The pilot valve is installed on the main valve body, an inlet of the pilot valve is communicated with the upstream valve cavity, and an outlet of the pilot valve, the downstream valve cavity and the control lower cavity are communicated with one another through guide pipes. Through the pre-adjusting effect of the pilot valve and the optimized control mechanism, the high control precision and stability can be kept under the complex working conditions such as frequent pressure fluctuation or large load change, and the common problems that in traditional design, pressure control is not stable, and a diaphragm is prone to being damaged are solved.