5366 results about "Valve seat" patented technology

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 relates to a paraffin type thermostat. The paraffin type thermostat comprises a main valve 1, a cover and seal gasket assembly 2, an upper support 3, a rubber pipe 4, a valve seat 5, a vent hole 6, a lower support 7, paraffin 8, an inductor 9, a bypass valve 10, a central rod 11 and a spring 12. The upper support, the lower support and the valve seat of the thermostat are riveted into a whole. The upper end of the central rod is fixed to the center of the upper support. The lower portion of the central rod is inserted into a central hole of the rubber pipe. The lower end of the central rod is conical. A cavity between the rubber pipe and a shell of the inductor contains the paraffin. The upper portion and the lower portion of the shell of the inductor are provided with the main valve and the bypass valve which are in linkage. The vent hole is formed in the main valve. The paraffin type thermostat is high in heat conductivity and guarantees that an engine cannot be excessively cold.

A valve seat for a pumping assembly. The valve seat includes a body including a gradient material structure that defines a strike face for the valve seat. The gradient material structure has a first material, a second material spaced from the first material, and a smooth compositional transition between the first material and the second material. In addition, the valve seat includes a bore extending through the body.

A valve seat for a pumping assembly. The valve seat includes a body including a gradient material structure that defines a strike face for the valve seat. The gradient material structure has a first material, a second material spaced from the first material, and a smooth compositional transition between the first material and the second material. In addition, the valve seat includes a bore extending through the body.

The invention relates to the technical field of pressure valves, and provides a high-back-pressure pneumatic valve for a semiconductor chemical system and an assembling method of the high-back-pressure pneumatic valve. The high-back-pressure pneumatic valve comprises an air cylinder assembly, a diaphragm and a valve seat. The cylinder assembly is provided with a cylinder upper cover and a cylinder body which are connected through a rotary lock catch structure, and the piston is assembled on the cylinder body. The diaphragm is provided with a sealing diaphragm part and a valve element integrally arranged in the center, the sealing diaphragm part is provided with a pressure-bearing protrusion and a sealing hook, and the pressure-bearing protrusion provides a back pressure counteracting area accounting for 25%-50% of the flexible area of the diaphragm. A valve port and a flow channel are formed in the valve seat, a mounting hole aligned with the valve port is formed in the valve seat, a sealing clamping groove is formed in the mounting hole, and the sealing clamping groove and the sealing hook are matched to form a sealing interface. The valve element table body is arranged at the valve port and driven by the air cylinder assembly to seal or break away from the valve port. According to the invention, high-back-pressure fluid impact can be effectively balanced, and the assembly efficiency and the maintenance convenience are greatly improved.

The invention discloses high-pressure fuel gas pressure regulating equipment in the technical field of fuel gas pressure regulating equipment, which comprises a valve body, and a valve rod, a reset spring and a gas inlet box which are arranged on the valve body, a valve seat and a diaphragm are arranged on the valve rod, the gas inlet box is communicated with a gas outlet of the valve body through a guide pipe, and a detection assembly is arranged in the gas inlet box; the detection assembly comprises an air pressure detection piece and a displacement detection piece, and a warning indicator is arranged on the air inlet box and used for giving an alarm when the air pressure detection piece detects that the air pressure below an inner cavity of the air inlet box is lower than a threshold value and the displacement detection piece does not detect that the valve rod moves. The high-pressure gas pressure regulating equipment is detected through the detection assembly, when the air pressure detection piece detects that the air pressure below the inner cavity of the gas inlet box is lower than a threshold value and the displacement detection piece does not detect that the valve rod moves, the warning indicator gives an alarm to remind a user, so that problems can be found in time, further deterioration of the faults is avoided, and the service life of the user is prolonged. And the probability of potential safety hazards is reduced.

The invention relates to the technical field of valves, in particular to a high-pressure-resistant quick opening and closing flat valve which comprises a valve body, a first valve seat, a second valve seat, a valve plate and a valve rod. The first valve seat and the second valve seat are arranged in a medium channel of the valve body, the valve plate is arranged between the first valve seat and the second valve seat in a sealing and sliding mode, and the valve rod is in driving connection with the valve plate. The middle of the valve rod is slidably connected to a valve deck in the middle of the top of the valve body, the hand wheel driving mechanism is connected to the upper portion of the valve deck, a pressure relief pipeline is arranged on the valve body, and the two ends of the pressure relief pipeline are communicated with a high-pressure side cavity, back to the valve plate, of the first valve seat and a low-pressure side cavity, back to the valve plate, of the second valve seat respectively. The pressure relief pipeline is provided with a pressure relief control valve used for controlling connection and disconnection of the pressure relief pipeline. The pressure difference generated by high-pressure fluid on the two sides of the valve plate can be balanced before the valve plate is opened, the main factor causing huge operation torque is fundamentally eliminated, opening and closing of the valve plate are extremely labor-saving and rapid, and rapid opening and closing under the high-pressure working condition are achieved.

A valve has a body having an inlet, an outlet, and chamber. The inlet is in fluid communication with the chamber and the chamber is in fluid communication with the outlet. The valve has a stem designed to be received in the chamber. The valve stem has a valve surface. A corrosion-resistant or nonreactive sleeve is inserted into the inlet. The sleeve has a first end and a second end opposite the first end and a bore that extends from the first end to the second end. When the sleeve is inserted into the inlet, the second end extends into the chamber and is configured to be deformed within the chamber to secure the sleeve in the inlet. The deformed second end defines a valve seat configured to engage the valve surface of the stem.

The invention relates to the technical field of hydraulic valves, and discloses a buffer overflow valve which comprises a shell, a first sealing ring is arranged on the surface of the shell, a connecting block is fixedly connected to the right end of the shell, an adjusting assembly is arranged in the connecting block, and a storage assembly is fixedly connected to the side, close to the shell, of the adjusting assembly. A moving assembly is arranged in the storage assembly, a spring is arranged between the storage assembly and the moving assembly, the adjusting assembly comprises a threaded rod, the surface of the threaded rod is in threaded connection with a connecting block, and the surface of the threaded rod is in threaded connection with a locking nut. A closed cavity is formed between a connecting column and a fixing seat, a second sealing ring is used for sealing, a valve element and an oil way in the connecting column are communicated with the closed cavity, the cavity is filled with oil, and when the oil on the left side of the valve element rises, due to the existence of the oil in the closed cavity, the valve element cannot instantly leave a valve seat at the bottom of a valve block; therefore, the buffer overflow valve can be opened at low pressure, and pressure impact cannot be generated.

The invention relates to the technical field of valves, in particular to a duplex check valve. Comprising a valve body, a circulation opening formed in the valve body, a valve seat arranged on the valve body and located in the circulation opening, a first through hole formed in the valve seat, a sealing valve clack arranged in the valve body in a lifting mode, a guiding piece arranged between the valve seat and the sealing valve clack, and a compression spring arranged between the guiding piece and the sealing valve clack. The auxiliary sleeve is arranged on the valve body and located at the circulation opening, the second through hole is formed in the valve body, the auxiliary valve clack is arranged on the valve body in a lifting mode and located in the circulation opening, the lower end of the auxiliary guide rod is fixedly arranged on the sealing valve clack, the linkage shaft is arranged at the lower end of the sealing valve clack and located in the auxiliary sleeve, and the lower end of the linkage shaft makes contact with the upper end of the auxiliary guide rod. Through the design of the double valve clacks, the double-sealing effect is achieved, the reliability and the sealing performance of the check valve are improved, the linkage shaft structure ensures that the main valve clack and the auxiliary valve clack move synchronously, and response is rapid.

A mixing valve including a body having first and second inlets, an outlet, and a mixing chamber. A first valve seat is located between the first inlet and the mixing chamber, and a second valve seat is located between the second inlet and the mixing chamber. A shuttle is moveable in the mixing chamber between the first and second valve seats and includes a first plug facing the first valve seat and a second plug facing the second valve seat. The plugs have trim surfaces that are one of, or a combination of, a fast-opening shape, a linear shape, and an equal percentage shape.

The invention relates to the technical field of fluid control equipment, and discloses an anti-backflow valve which comprises a valve body, a valve rod, a sealing valve seat and a valve plate, an output pipe is arranged on the outer wall of the right side of the valve body, an input pipe is arranged at the bottom of the valve body, the sealing valve seat is fixedly installed in the input pipe, and the valve plate is pressed on the sealing valve seat. The valve rod is rotated to drive the connecting disc to rise, the spring drags the valve plate to rise, the valve plate is separated from the sealing valve seat, the inserting rod is arranged, on one hand, the valve plate is guided, on the other hand, when the valve needs to be closed, the valve rod can drive the inserting rod to move downwards, and then the valve plate is tightly pressed on the sealing valve seat; if the water pressure in the input pipe is lower than the water pressure in the valve cavity of the valve body, the pressure acting on the upper surface of the valve plate can downwards press the valve plate at the moment, then the valve plate is pressed on the sealing valve seat, the valve is closed, and then the backflow problem is avoided.

The valve device comprises a driving assembly, a valve seat assembly, a diaphragm and a valve element assembly, the valve seat assembly is fixedly connected with the driving assembly, the valve seat assembly is provided with a valve port, the driving assembly is in transmission connection with the valve element assembly, the valve element assembly can axially move to open or close the valve port, and the diaphragm is arranged in the valve element assembly in the axial direction of the valve device. At least part of the diaphragm is arranged between the driving assembly and the valve seat assembly; the valve device is provided with a liquid inlet cavity and a balance cavity, the valve element assembly is provided with a balance channel, the balance channel is communicated with the balance cavity and the liquid inlet cavity, the wall part limiting the mounting hole and the valve element assembly are arranged in a sealed mode, and the diaphragm limits part of the wall part of the balance cavity. Part of the working fluid can enter the balance cavity through the balance channel, and the driving force of the valve device can be reduced.

The utility model relates to an inverted metal sealing ball valve, which relates to the technical field of ball valve sealing, and comprises a valve body, a self-sealing end cover, a main valve seat, a main valve seat and a sealing cover, the bottom of the valve body is provided with a mounting port for mounting an integrated ball rod, the self-sealing end cover is used for sealing the mounting port, and the main valve seat is in sealing fit with the integrated ball rod; one end of the self-sealing end cover is in sealing fit with the main valve seat, the other end of the self-sealing end cover is in sealing fit with the auxiliary valve seat far away from the integrated ball rod, and a first disc spring is arranged at the contact position of the self-sealing end cover and the integrated ball rod. The integrated ball rod is arranged, so that the situation that a valve rod and a ball body of a traditional ball valve are not suitable for high-frequency operation occasions due to the fact that a flat tenon or square tenon connecting structure is adopted is avoided; by means of the valve, the reliability of opening or closing of the valve is guaranteed, and the sealing effect can be improved by arranging the first disc spring.

The invention relates to the technical field of hydraulic valves, and discloses an integrated safety hydraulic control one-way valve integrated with a tail beam telescopic cylinder, which comprises a valve body, a through main channel arranged in the valve body and a valve core assembly arranged in the main channel, the valve core assembly comprises a joint valve sleeve, a valve core spring, a valve core, a valve seat, a liquid inlet valve sleeve, an ejector rod spring and an ejector rod, the valve seat is arranged between the connector valve sleeve and the liquid inlet valve sleeve, the valve element is arranged in an inner cavity of the connector valve sleeve in a sliding mode, and the ejector rod is arranged on the axis extension line of the valve element. The valve element is of a primary-secondary valve structure and comprises a main valve element and a pilot valve element coaxially arranged in the main valve element, an axial guide inner cavity is formed in the center of the interior of the main valve element and comprises a damping cavity and a conical surface plugging cavity, and a pilot valve channel is formed in the wall of the damping cavity. The problem that a valve element of a traditional hydraulic control one-way valve rapidly moves at the hydraulic control opening moment to generate severe mechanical impact is solved, and the service life of a valve set is prolonged.

The present invention achieves a larger flow rate of a fluid control valve without increasing a size of an orifice or an actuator. The fluid control valve includes an orifice having a valve seat surface and a valve body having a seating surface to be seated on the valve seat surface. The orifice has a plurality of inflow ports and a plurality of outflow ports that are open along a first direction on the valve seat surface. The plurality of inflow ports and the plurality of outflow ports are arranged side by side in a second direction intersecting the first direction.

A sanitary valve having a main valve with a diaphragm movable between closed and open positions. The main valve is in an inner housing rotatably mounted in an outer housing. The inner housing has a first valve opening connected to a first valve opening in the outer housing to form a valve outlet. The inner housing has a second valve opening arranged on the outside relative to the valve outlet and is paired with a second valve opening in the outer housing forming a valve inlet. Paired second valve openings are brought into congruence by a relative twisting of the inner and outer housings with the valve inlet being variable. The inner housing has a pot-base inside from which a valve connector protrudes which connects the inner part first valve opening forming the valve outlet to the valve seat formed by the free sleeve end region of the valve connector.

The utility model relates to a three-way flue and a flue gas treatment system equipped with the three-way flue, the three-way flue comprises a flue gas inlet section and two flue gas outlet sections, the two flue gas outlet sections are both provided with gate valves, the two groups of gate valves share one group of gate plate assembly, the gate plate assembly comprises a blind plate and a pore plate, the hole plate is a flashboard with a through hole, the blind plate is selectively inserted into one valve seat, and the hole plate is inserted into the other valve seat; and the three-way flue is provided with a blind plate switching execution mechanism for switching the blind plate and the pore plate. In the utility model, the two groups of gate valves share one group of gate component, and smoke can only be discharged from one smoke outlet section instead of being discharged from the two smoke outlet sections at the same time, so that the operation reliability is ensured, and the condition of misoperation is avoided; and the blind plate and the pore plate are adopted for switching, so that the sealing performance of the two groups of gate valves can be ensured.

The invention relates to the technical field of valves, in particular to a high-temperature material flow adjusting device and a control method thereof.The high-temperature material flow adjusting device comprises a device body, a spring hanging bracket fixed to the device body, a water inlet and return system, a control system, a monitoring device and a connecting pipe fixed to a discharging port of the device body. By means of the curved surface fitting design of the valve head and the valve seat, linear adjustment of the high-temperature material flow is achieved, the defects that small opening is sensitive and large opening is slow are thoroughly overcome, the micro-adjustment requirement is accurately met, material level and temperature signals are collected in real time through a monitoring device, closed-loop control is constructed through a PLC control system, and the control precision of the high-temperature material flow is greatly improved. The electric actuating mechanism is automatically driven to adjust the position of the valve rod, manual intervention is not needed, manual judgment errors are avoided, potential safety hazards of operation in a high-temperature scene are eliminated, flow control accuracy and stability are greatly improved, and the problem that a traditional control loop is unstable is solved.

A shock absorber according to the present invention includes: a cylinder; a rod movably inserted into the cylinder; an extension side chamber (operation chamber) and a compression side chamber (operation chamber) provided in the cylinder; a valve disc that is provided to be movable in the axial direction on the outer circumference of the rod and has an annular valve seat and a port which is opened on the inner circumference of the annular valve seat and causes the extension side chamber (operation chamber) and the compression side chamber (operation chamber) to communicate with each other; and an annular leaf valve that opens and closes the port.

A kind of reciprocating compressor full-range control type rotary cup exhaust valve, including valve seat, valve core, valve rod and the like components, valve core and valve seat all adopt V cup type structure, valve core and valve rod adopt integrated structure, are controlled by rotary motion driving device full range, set the motion law of valve core, valve rod, execute acceleration, deceleration, waiting and brake and the like motion instruction, realize rotary valve opening and closing, rotary friction is small, sealing performance is good, long-term use wear can be automatically compensated, flow coefficient is big, resistance coefficient is small, the effective flow area of valve core and valve seat is more than 2 times of conventional plane-shaped meshed intake valve;The present application also has the characteristics of no impact, long stay time when fully open, overcome the essential defects of the prior art meshed exhaust valve, such as large resistance loss, valve piece impact is serious;The present application can be used for the modification of existing meshed exhaust valve, and can also be used as a complete set of exhaust valve for new reciprocating compressor.

The utility model discloses a valve device which comprises a valve seat with a water distribution cavity, an inlet communicated with the water distribution cavity and at least two water outlets communicated with the water distribution cavity. The at least two valves can move relative to the valve seat, and the water outlet of the valve seat can be opened or closed through movement of the valves; the switching device is provided with a pushing body which can move in the axial direction so as to enable the valve to move; the valve device is provided with a valve and a stabilizing body which can stabilize the valve in the state that the water outlet is opened or closed at different stable positions, the valve device can reduce pressing force during switching, meanwhile, opening and closing of a plurality of valves are controlled through a single key, the integrated design is achieved, the modularization degree is high, and the size is small.

The invention relates to the technical field of valve air tightness detection, and discloses an automatic pressurization air tightness detection method and system for a high-pressure valve, and the method comprises the steps: determining the effective volume and background leakage rate of a test loop, completing the pre-debugging of a valve seat and a seal, supplying air to the test loop, building dual criteria, and when an isothermal steady-state condition is satisfied, carrying out the automatic pressurization air tightness detection of the high-pressure valve. The method comprises the following steps: connecting a reference sealing cavity in parallel in a test loop, counteracting environment drift and slow change of gas supply, and calculating a leakage rate and deducting a background leakage rate according to the change of effective volume and pressure of the test loop along with time and the change of gas temperature along with time in combination with a real gas compression factor. And when the difference value between the gas temperature and the valve body temperature exceeds a temperature difference judgment threshold value, the leakage rate is corrected. And comparing the leakage rate with a preset leakage rate threshold value to obtain a judgment result. According to the invention, the voltage stabilization time is shortened, the thermal transient state and environmental drift are inhibited, and the small leakage detection capability, the result consistency and the judgment accuracy of the high-pressure valve are improved.

The invention discloses a built-in electromagnetic valve type semi-active shock absorber and a working method, the built-in electromagnetic valve type semi-active shock absorber comprises a working cylinder, a floating piston is arranged in the working cylinder, and an inner cavity of the working cylinder is divided into an air cavity and an oil cavity by the floating piston; the damping adjusting valve is slidably arranged in the oil cavity and divides the oil cavity into a compression cavity and a recovery cavity, and the upper end of the damping adjusting valve is connected with the piston rod; the damping adjusting valve comprises a valve body, a containing cavity is formed in the valve body, and a main valve seat hole is formed in the lower end face of the valve body. The main valve seat hole is communicated with the accommodating cavity in the valve body and the compression cavity; the valve core comprises a main valve core, a main valve spring and a main valve spring seat; the main valve spring seat is fixed in a containing cavity of the valve body assembly, and a pilot cavity is formed by the main valve spring seat and the electromagnetic valve assembly; the main valve spring is arranged between the main valve spring seat and the main valve element in a sleeved mode and abuts against the main valve element on the end face of the main valve seat hole. And the main valve core and the main valve seat hole form a main valve port. According to the built-in electromagnetic valve type semi-active shock absorber and the working method, machining is easy, and meanwhile the quick response capacity is achieved.

The utility model provides an electric stop valve which comprises a valve body component and a driving component, the valve body component comprises a valve seat and a valve core structure rotatably arranged in the valve seat, a valve port is arranged in the valve seat, the valve core structure opens and closes the valve port through rotation, the driving component comprises a driving shell, the driving shell is welded with the valve seat, and the driving component drives the valve core structure to rotate. According to the scheme, the valve element structure is arranged in the valve seat, the driving component drives the valve element structure to rotate, and therefore opening and closing of the valve port are achieved. According to the scheme, the valve seat in the valve body part and the driving shell in the driving part are directly connected in a welding mode, and compared with the mode that direct connection is conducted through threads or indirect connection is conducted through other shell structures, the direct welding mode is good in sealing performance, the leakage risk is reduced, implementation is easy, and the manufacturing cost is low.

The utility model relates to a cut-off type hydraulic ball valve for deep sea, which comprises a single-action hydraulic actuator and a valve, and the hydraulic actuator comprises a compact cylinder body, a piston rack, a gear transmission shaft, a pressure balancer, a spring energy storage device and a valve position feedback indicator. And the valve part comprises a valve body, a valve rod, a ball, a valve seat, a valve seat gland and a stuffing box. The deep-sea external pressure resistant ball valve has the advantages of deep-sea external pressure resistant working condition, simple structure, low cost and high stability.

The invention relates to the technical field of gate valves, in particular to a double-disc gate valve with an improved sealing structure, which comprises a valve body, one side of a valve cavity on the valve body is an upstream side, the other side of the valve cavity is a downstream side, a valve cover is arranged at the top of the valve body, and an upper sealing cover is arranged at the joint of the valve body and the interior of the valve cover. A connecting nut is fixedly installed at the top of the valve cover, a valve rod is in threaded connection with the interior of the connecting nut, and the bottom of the valve rod is provided with an opening and closing assembly comprising a side pressing block and two sets of connecting bases connected with each other; the opening and closing assembly is arranged, the first gate plate is matched with the first valve seat, the second gate plate is matched with the second valve seat, double-side quadruple sealing can be achieved when the valve is closed, the sealing performance is improved, meanwhile, the connecting seat can be pressed through the side pressing block during sealing so as to enhance the sealing performance, and the sealing performance is improved. The hook structures formed between the side pressing blocks and the connecting bases can assist the connecting bases on the two sides to be close to the middle position, the torque needed when the valve is opened is reduced, and the service life of the gate is prolonged.

A hydrogen pressure reducer for a hydrogen supply system of a hydrogen fuel automobile relates to the technical field of hydrogen pressure reducers and comprises a valve body, a diaphragm type pressure reducing mechanism, a pilot-operated electromagnetic valve, a gas inlet and a gas outlet. The interior of the valve body is divided into a high-pressure cavity and a low-pressure cavity through the valve The diaphragm type pressure reducing mechanism is composed of a valve element assembly, a diaphragm assembly and a pressure adjusting assembly which cooperate to enable the output pressure of the air outlet to be kept stable, and assembly errors are eliminated. The valve element assembly is provided with a necking part to adjust the opening degree of a throttling hole, and accurate control is achieved. The base provides guiding constraint, and reliable sealing is ensured. The diaphragm assembly adopts a supporting disc, a diaphragm, a pressing disc and a locking nut fixing structure, so that the diaphragm is prevented from deforming, and the service life is prolonged. The pressure adjusting assembly comprises an upper cover, a pressure adjusting spring, a pressure adjusting spring seat and a pressure adjusting stud, and the pressure adjusting accuracy and stability are guaranteed. The overall reliability, sensitivity and safety of the hydrogen pressure reducer are improved.

The invention relates to the technical field of valves, discloses a dry shaft type two-way sealing high-performance butterfly valve and aims to solve the problems that in the prior art, a valve rod is corroded and abraded, high-temperature and high-pressure sealing fails, and traditional dry shaft isolation is fragile. The three-eccentric butterfly valve is characterized by comprising a three-eccentric butterfly plate, an elastic metal valve seat and a main shaft isolation assembly. The elastic metal valve seat is composed of a corrugated spring ring and a stainless steel / flexible graphite composite sealing layer, and bidirectional zero leakage is achieved. The dry shaft isolation assembly comprises an isolation sleeve, an inner side dynamic sealing piece, a bearing assembly and a medium blocking cavity, and complete isolation of the valve rod and a medium is achieved. By the adoption of the technical scheme, long-term reliable dry shaft isolation and excellent two-way zero-leakage sealing performance can be achieved, and the maintenance cost is reduced.

The utility model relates to the field of control valves, and discloses a chilling water pump inlet and outlet sliding plate valve which comprises a valve body, an outer hexagonal plug is in threaded connection with the interior of the valve body, a valve rod is arranged in the valve body, a sliding sleeve is fixedly connected to the side wall of the valve rod, a valve plate is fixedly connected to the side wall of the sliding sleeve, and a cleaning assembly is arranged in the valve body. An upper valve seat is fixedly connected to the side wall of the valve body, a lower valve seat is fixedly connected to the side wall of the valve body, a sealing ring is arranged in the valve body, and the side wall of the sealing ring is fixedly connected between the upper valve seat and the lower valve seat. Attachments generated when the valve plate is opened and closed are scraped through a scraper structure in the valve seat, sealing and dust prevention of the spring cavity are achieved by adding an O-shaped pattern in a spring framework, the lower valve cover at the bottom of the valve body is convenient to maintain, a furnace can be directly opened for overhauling, manual cleaning can be achieved, and an outer hexagonal plug is opened in the operation process and high-pressure clear water is used for online cleaning. And the middle cavity is kept clean.