66 results about "Blocked valves" patented technology

The invention relates to the technical field of block valves, in particular to a self-compensation type intelligent block valve. Comprising a valve body, a ball body is rotatably connected in the valve body, the valve body is provided with a liquid inlet and a liquid outlet, the upper side of the ball body is fixedly connected with a valve rod rotatably connected with the valve body, the upper side of the valve body is rotatably connected with a rotating rod perpendicular to the space of the valve rod, and the upper side of the valve body is provided with a first cavity; the rotating rod and the valve rod are in transmission through a power module, the valve rod is in limited sliding connection with an inserting rod, and the inserting rod is fixedly connected with a limiting column. According to the cut-off valve, the limiting column is clamped into the upper side of the limiting groove to accurately control opening and closing of the ball body, whether the ball body is in the opening and closing state or not is directly fed back to an operator through the extending length of the inserting rod, and transmission deviation caused by problem observation of the operator or pipeline vibration is avoided; therefore, an operator misjudges the state of the cut-off valve, and normal operation of the cut-off valve is affected.

The invention relates to the technical field of fireproof valves, in particular to a safe smoke exhaust fireproof valve which comprises a valve body, an executing mechanism and a fire blocking valve plate arranged in the valve body, the executing mechanism is in driving connection with a driven assembly used for controlling opening and closing of the fire blocking valve plate, and an isolation base is arranged at one end of the valve body; a plurality of groups of guide vanes driven by cylindrical cams are arranged in the isolation seat, when the fire blocking valve plate is closed, the guide vanes are synchronously folded inwards to form a gradually-shrunk flue, the three groups of guide vanes generate progressive displacement through the wheel groove height difference design of the cylindrical cams, sequentially-reduced included angles are formed between the guide vanes and the valve plate, and the impact force of high-speed flue gas is dispersed step by step; a locking bolt attracted by magnetic force is matched with a wedge-shaped seam of a second rack, and the folding state of the guide piece is forcibly fixed to resist external disturbance; and the shifting assembly with the arc surface clamping block is arranged, the magnetic lock is triggered to be released through the moving time sequence of the first pushing strip, then the guide piece is driven to be unfolded, and pure mechanical linkage self-resetting is achieved.

The application provides a deep-sea rapid blocking valve and a use method. The rapid blocking valve comprises a valve body, a valve cover and a valve rod. The valve body is internally provided with a valve cavity. The valve cover is connected with one side of the valve body to form a closed space. A flow channel is arranged in the valve cavity. A one-way valve structure and a two-way valve structure are arranged along the flow channel. The inner side end of the valve rod extends into the valve cavity and is connected with the one-way valve and the two-way valve in linkage. The one-way valve and the two-way valve are both provided with sealing structures between the valve body and the inner wall of the valve body. The L-shaped integrated valve body type is arranged in a side-mounted structure. The two-way ball valve is integrated in the interior. The structure is compact, light in weight, small in size, reduces the external leakage points of the valve, is convenient to install, improves the pressure-bearing capacity and the sealing capacity.

The utility model provides an assembly type waterproof valve head and a pre-filter. The assembly type waterproof valve head comprises a valve body and a waterproof elbow. The valve body comprises a main pipe body and a connector part, a water inlet end and a water outlet end are formed at the two axial ends of the main pipe body respectively, the connector part extends from the side wall of the main pipe body in the radial direction to be connected with a filter bottle of the pre-filter, and the inner diameter of the connector part is larger than that of the main pipe body. Two assembling steps located on the two radial sides of the main pipe body are formed at the joint of the connector part and the main pipe body, and a valve body assembling part is formed on each assembling step. The waterproof elbow is embedded into the valve body in a split mode and comprises a connecting straight section embedded into the main pipe body and connected with the water outlet end and a bent section extending towards the side where the valve body connector part is located, the tail end of the bent section extends out of the assembling step, and an elbow assembling part clamped with the valve body assembling part is formed on the peripheral wall of the bent section. The peripheral wall, facing the water inlet end side, of the bent section forms an isolation part for isolating the water inlet end and the water outlet end.

The utility model relates to the technical field of channel body assembling, in particular to a multi-channel single-hole channel assembling machine which comprises a machine frame, a disc assembly is installed on the surface of the machine frame, and an assembling mechanism is arranged on the surface of the machine frame and located on the outer side of the disc assembly. A channel body feeding mechanism, a choke valve feeding mechanism, a sealing ring feeding mechanism and a channel upper cover feeding mechanism are sequentially arranged on the outer side of the machine frame in the circumferential direction, and a defective product discharging line is further arranged on the surface of the machine frame. According to the automatic feeding device, four parts including the channel body, the choke valve, the sealing ring and the channel upper cover can be sequentially and automatically fed, whether neglected loading exists or not can be visually judged through the choke valve and the sealing ring, ultrasonic welding is conducted after loading is completed, then silicone oil is sprayed for lubrication, and finally finished products are discharged; all actions of the device are automatically realized, no personnel is needed, the efficiency is improved, the precision is improved, and the production cost is reduced.

The application discloses a channel control device, a cooking utensil and a control method of the cooking utensil. The channel control device comprises a blocking valve, a driving pump and a control valve. The blocking valve is used for opening or closing a connecting channel communicated with a cooking cavity of the cooking utensil. The driving pump is communicated with the blocking valve through a pipeline to drive the action of the blocking valve. The control valve is arranged in the pipeline and is used for connecting or disconnecting the pipeline. The pipeline is disconnected by the control valve, the keeping of the opening state of the blocking valve is realized, the driving pump does not need to continuously run, the running time of the driving pump in the air exchange process is shortened, the service life of the driving pump is prolonged, the failure rate of the driving pump is reduced, the use cost of the user is reduced, and the use experience of the user is improved.

The present disclosure relates to a grey lock pressure charging stop valve, comprising a valve body, a valve seat, a valve rod and a valve disc, further comprising a driving device, a first buffer structure and a second buffer structure, the valve rod is controlled by the driving device to sequentially have a first displacement and a second displacement in the direction of the valve seat, so as to press the valve disc on the valve rod tightly on the valve seat; the first buffer structure and the second buffer structure are respectively arranged between the valve rod and the valve disc; the first buffer structure is configured to buffer the valve seat when the valve rod enters the first displacement; the first buffer structure and the second buffer structure are configured to buffer the valve seat together when the valve rod continues to move from the first displacement to the second displacement. The impact force on the valve seat is buffered by two sections, which avoids damage to the sealing surface of the valve disc and / or the valve seat due to excessive impact force, resulting in valve sealing failure, leakage accidents, safety and economic losses.

The utility model relates to the technical field of one-way valves, in particular to a one-way valve for an aluminum pipe, which comprises a cylindrical valve body, a valve seat is arranged in the valve body and fixedly arranged along the inner wall of the valve body, a valve core is movably arranged in the valve seat, the outer diameter of the valve core is smaller than the inner diameter of the valve seat, and the outer diameter of the valve core is larger than the inner diameter of the valve seat. A limiting device used for blocking the valve element is arranged at the bottom of the valve seat, a baffle ring used for blocking the valve element is arranged at the top of the valve seat, it is guaranteed that the valve element is always kept at the correct position in the sliding process, the situation that the valve element deviates from the center due to shaking or impact is avoided, the valve element is prevented from inclining or rotating in the valve seat, the stability of the valve element is improved, and the service life of the valve element is prolonged. And the service lives of the valve core and the valve seat are prolonged.

The application belongs to the field of oscillators, and particularly relates to a jet flow valve rotating oscillator, which rotates a flow blocking valve in a working cavity, relies on the fluid itself to push the flow blocking valve to rotate, can achieve that the jet flow passing through the flow blocking valve forms jet flows which are in a state of increase and decrease and dynamically change in an upper cavity and a lower cavity, the change of the jet flow in turn pushes the flow blocking valve to rotate back and forth, and further continuously changes the flow area of an outlet hole and controls the opening and closing of an upper feedback channel and a lower feedback channel, under the joint action of the upper feedback channel, the lower feedback channel and the flow blocking valve, periodic fluid oscillation is self-excited, the oscillation amplitude is obviously increased, and mechanical oscillation effect is achieved, which is beneficial to realize multi-dimensional composite vibration of a pipe column system.

The utility model provides a flow regulating valve, which comprises a valve body, a flow regulating valve, a flow regulating valve and a flow regulating valve, each valve cavity is correspondingly and rotatably provided with one valve plate assembly, and the valve plate assemblies are used for opening or closing the valve cavities; the driving assembly is arranged on the valve body, the transmission structure is arranged between the driving assembly and the valve plate assemblies, the transmission structure is provided with two transmission sections which are arranged in a spaced mode, an included angle is formed between the extension directions of the two transmission sections, and the two transmission sections and the two valve plate assemblies are arranged in a one-to-one correspondence mode; the driving assembly is in driving connection with the two transmission sections, the transmission sections are in driving connection with the valve plate assemblies, and the driving assembly can drive the two valve plate assemblies to relatively rotate in the opposite directions so as to adjust the flow amount of fluid in the valve cavity. By means of the technical scheme, the problems that when an existing adjusting valve adjusts flow, adjusted airflow is unstable, and adjusting performance is poor can be solved.

The utility model relates to a multifunctional ball and plug throwing rotary circulating device which comprises a multifunctional shaft, a single-hole plug blocking valve and a check ring. A shaft channel is formed in the inner wall of the multifunctional shaft in a penetrating mode from top to bottom, a mounting groove is formed in the multifunctional shaft, and a single-hole plug blocking valve is arranged in the mounting groove. A check ring is arranged in the shaft channel; an upper bearing is arranged on the multifunctional shaft outer ring and located on the lower portion of the single-hole blocking plug through an upper bearing seat, and a lower bearing is arranged on the multifunctional shaft outer ring through a lower bearing seat. The multifunctional ball and plug throwing rotary circulating device is connected between a top drive and the upper portion of a drilling tool, a ball or a rubber plug can be thrown into a pipe column only by rotating the hand wheel by 90 degrees during ball throwing, the top drive does not need to be detached for ball throwing or plug throwing, operation continuity is achieved, and well drilling timeliness and safety are improved. And due to the arrangement of the upper bearing and the lower bearing, the ball-throwing and plug-throwing rotary circulating device has the ball-throwing and plug-throwing function and the rotary circulating head function, and the adaptability of the ball-throwing and plug-throwing rotary circulating device is improved.

The utility model belongs to the technical field of wine jar, specifically relates to a integrally formed glass wine jar, it includes jar body, characterized by: the lower part of jar body is equipped with the valve seat of integrally forming with jar body, is equipped with the valve cavity in the valve seat, the upper end of valve cavity is the mounting port, the lower end is communicated valve nozzle, the inner diameter of valve nozzle is less than valve cavity, and valve cavity is linked together with jar body, still include valve cover and elastomer, valve cover can be assembled on the mounting port, the top wall of valve cover is equipped with through -hole, is equipped with valve rod in through -hole, the lower part of valve rod is located in valve cavity, the lower part of valve rod has valve head, valve head can block valve nozzle, the lower end of elastomer is connected valve rod, and the upper end is connected valve cover, the jar only needs to install valve cover and valve rod on the valve seat, reduces the connection between valve seat and jar body and the sealing of junction, not only has simplified the connecting structure between discharge valve and jar body, still makes the connection between discharge valve and jar body and the service life of jar body, avoids the connecting part of both to leak due to the sealing problem.

A system and method for a hydraulic swing system (120) of a machine (100) to prevent drift without engaging a swing brake is described. The hydraulic swing system (120) includes a pump (102) powered by a motive element such as an engine (122) and provides a swing motor (130) for rotating the chassis of the machine (100) relative to the undercarriage. The swing system (120) includes a control valve (104) on a first path between the pump (102) and the motor (130) and a second control valve (104) on a second path. The swing system (120) further includes a blocking valve (126) to block hydraulic fluid flow and thereby prevent drift engaged when the system is in neutral and below a threshold rotation rate.

The utility model discloses an adjustable one-way valve with an indication function and a breathing mask adopting the adjustable one-way valve. An adjustable one-way valve with an indication function comprises a one-way valve body provided with an air vent, a blocking valve plate used for blocking the air vent and a pressure adjusting piece, the outer wall of the pressure adjusting piece is in threaded connection with the one-way valve body, a spring is arranged between the pressure adjusting piece and the blocking valve plate in a clamped mode, and the pressure adjusting piece and the blocking valve plate are in threaded connection. The spring is located in the one-way valve body. The pressure adjusting piece is a transparent visible ventilation structure which is ventilated in the axial direction, and an indicating ball is movably connected into the transparent visible ventilation structure. The one-way valve further comprises a limiting cover plate, the limiting cover plate is connected with the one-way valve body in an interference fit mode, and the center of the limiting cover plate is provided with an exposure opening for partially exposing the pressure adjusting piece. The indicating ball is movably connected in the transparent visible ventilation structure, and the ventilation condition of the one-way valve is known by judging whether the indicating ball moves in the transparent visible ventilation structure or not.

The utility model provides a gear valve and a tractor. A gear valve comprises a valve body, a gear shifting mechanism, an oil cylinder piston and a detection device used for detecting the position of the oil cylinder piston, the oil cylinder piston is installed in the valve body in a sliding mode, the gear shifting mechanism is connected with the oil cylinder piston, and the detection device abuts against the gear shifting mechanism.

A valve seat ring is in an annular shape and is installed on a valve seat table, a pressing ring is arranged on the periphery of the valve seat ring in a sleeving mode and presses the valve seat ring to the valve seat table in the thickness direction, the lower end of a covering cylinder in the height direction abuts against the pressing ring, and the upper end of the covering cylinder in the height direction is pressed downwards through a boss ring. The utility model provides a dual-seal stop valve with a replaceable valve seat. A boss ring is arranged on the inner wall of a valve cover seat of a valve cover; the compression ring fixes the valve seat ring in the diameter direction and the thickness direction, and therefore good fixing and sealing effects are achieved. The upper end of the covering cylinder is pressed by the boss ring of the valve cover, the pressing ring is fixed at the lower end of the covering cylinder, finally, the valve seat ring is fixed, and the covering cylinder is installed in the valve body without interfering with the sealing effect at the position of the valve cover; the pressing ring sealing ring is installed on the valve seat table and clamps the pressing ring and the valve seat ring in the radial direction, so that sealing is formed at the positions of the valve seat ring and the pressing ring, and the leakage risk at the positions is greatly reduced.

The utility model belongs to the technical field of valves, and particularly discloses an electromagnetic valve, a valve device and gas water heating equipment. The electromagnetic valve comprises an electromagnetic mechanism, a main sleeve, a valve port frame, a valve element mechanism and a main elastic piece. The valve port frame is connected to the main sleeve, the valve port frame and the main sleeve define a containing space with a lateral opening, and a valve port coaxial with the main sleeve is formed in the end, away from the main sleeve, of the valve port frame. The first end of the valve element mechanism is inserted into the inner cavity of the main sleeve in a sliding mode, the second end of the valve element mechanism is provided with a sealing cap, and the sealing cap is located in the containing space and can open or block the valve port so that the valve element mechanism can be switched between the open state that the valve port communicates with the lateral opening and the closed state that the sealing cap closes the valve port. According to the utility model, the detection and maintenance convenience of the electromagnetic valve and the valve device can be improved, the processing and maintenance cost of the electromagnetic valve and the valve device is reduced, and the cost of gas water heating equipment is reduced.

The utility model provides a guiding assembly, a sheath base and a choke valve, the guiding assembly comprises a sealing structure, a guiding channel is formed in the sealing structure, and a guided piece can penetrate through the sealing structure through the guiding channel and intervenes in a corresponding position in a human body under the guiding of the guiding assembly. The sealing structure comprises weakening structures, the weakening structures are arranged on the two opposite sides of the guide channel, after the guide assembly is used, an operator can tear the sealing structure from the weakening structures, the guide assembly is withdrawn from the human body, and the tearing difficulty of the guide assembly can be reduced. On the basis, the reinforcing structure is arranged in the sealing structure, and the reinforcing structure can be matched with the weakening structure in the using process of the guide assembly, so that the structural strength of the weakening structure is improved, and then the sealing capacity of the weakening structure is improved.

The utility model discloses a valve with an anti-blocking structure, which relates to the technical field of anti-blocking valve bodies and comprises a valve, a pipeline filter arranged at one end of the valve, the pipeline filter comprises a filter seat, a water inlet, a water outlet, a water inlet pipe and a top cover, and the water inlet pipe and the top cover are respectively positioned on two sides of the filter seat. A connecting rod, a filter element and a shielding mechanism. By arranging the shielding mechanism, the top cover is moved upwards, the top cover moves to drive the filter element to move, the fixed ring pushes the movable ring to move upwards through the clamping block, the movable ring moves upwards to shield the water inlet and the water outlet, and the fixed protruding block makes contact with the lower pressing ring to push the lower pressing ring to move; the clamping block moves into the movable ring and is separated from the fixed ring, then the filter element continues to move out of the filter seat, and the filter element is cleaned, so that the water inlet and the water outlet are automatically shielded when the filter element is cleaned, and unfiltered water is prevented from flowing into the valve through the water outlet.

The present invention relates to a blocking valve for a substrate processing apparatus and a substrate processing apparatus. The blocking valve includes a valve unit, a driver, and a blocking body. The valve unit includes an opening / closing unit that is retractable and extendable. The driver drives the opening / closing unit. The blocking body includes an accommodation unit, and the opening / closing unit is accommodated in the accommodation unit. The blocking body includes a gas flow inlet connected to the accommodation unit and a gas flow outlet connected to the accommodation unit, and the opening / closing unit opens or closes the gas flow inlet or the gas flow outlet in the accommodation unit.

According to the invention, a valve assembly capable of mitigating an overpressure condition is disclosed. The valve assembly includes: a mounting portion having a hollow portion therein and mounted on a mounting cup; a stem housing having a communication flow path communicating the hollow portion and the receiving space, and having an extension tube extending from the mounting portion; a valve stem, one side of which passes through a through hole formed in a central portion of the mounting cup and the other side of which is slidably disposed within the hollow portion, and which has an orifice selectively communicating with the hollow portion by sliding; and a flow path blocking valve portion configured to block an inlet of the communication flow path when an overpressure occurs. The flow path blocking valve portion includes: a closure member made of spherical steel; a fusible insert accommodated within the extension tube such that one side of the fusible insert faces the inlet when the fusible insert fully accommodates the closure member and retains the closure member therein, and is configured to melt at a preset temperature or higher to release the retention of the closure member, and to release the fusible insert from the inlet when the fusible insert fully accommodates the closure member and retains the closure member therein. Blocking a gap between the inlet and a closure arranged to cover the inlet; and a cover mounted on the extension tube to cover the other side of the fusible insert and configured to prevent displacement of the fusible insert within the extension tube.

The present invention relates to a block valve for a substrate processing apparatus and a substrate processing apparatus, which includes a valve section having an opening / closing section that contracts and expands, a drive section that drives the opening / closing section, and a block main body that includes a storage section in which the opening / closing section is housed, the block main body including a gas inlet connected to the storage section and a gas outlet connected to the storage section, and the opening / closing section opens and closes the gas inlet or the gas outlet within the storage section.

The invention provides a pigtail device and a fluid pumping system. The pigtail device is arranged at the far end of the fluid pumping device and comprises a pigtail body, a blocking valve is arranged on the pigtail body, and the blocking valve comprises a flow control unit; the flow control unit is arranged to be capable of being penetrated by a target element, and the flow control unit is in a closed state under the action of the maximum pulsating pressure difference of the environment. In addition, the invention further provides a fluid pumping system. Stable sealing performance is provided through the flow control unit, and the safety risk caused by the fact that thrombus in the pigtail falls into the human body is prevented.

The present inventive concept relates to a block valve for a substrate processing device, and a substrate processing device, the block valve comprising: a valve part having a contracting and expanding opening and closing part; a drive part which drives the opening and closing part; and a block body which comprises an accommodating part in which the opening and closing part is accommodated, wherein the block body comprises a gas inflow port connected to the accommodating part and a gas outflow port connected to the accommodating part, and the opening and closing part opens and closes the gas inflow port or the gas outflow port, within the accommodating part.

The invention provides a quick oxygen filling butt joint device, which belongs to the technical field of oxygen filling and comprises a communicating pipe, a butt joint, a blocking valve, a pressure release valve, a barometer and a connecting pipe. Wherein the butt joint is connected with one end of the communicating pipe, the butt joint is used for being in butt joint with an oxygen tank, and the butt joint comprises a mounting pipe in threaded connection with the connecting pipe; the ejector pin is arranged on the inner wall of the mounting pipe in a sliding mode in the axis direction of the mounting pipe, and two limiting columns are symmetrically arranged on the two sides of the outer wall of the ejector pin; and the switching sleeve is arranged on the outer side of the mounting pipe in a sleeving mode and rotationally connected with the mounting pipe, a through groove matched with the limiting column is formed in the inner wall of the switching sleeve, the limiting column of the ejector pin is movably contained in the through groove, and the ejector pin can be driven to move in a reciprocating mode in the axis direction by rotating the switching sleeve. The device can flexibly adjust the state of the ejector pin, adapts to new and old oxygen tank types, and improves the filling efficiency.

The invention discloses an intelligent control system and method for synchronous vacuumizing and quantitative oil injection of multiple transformers. The intelligent control system comprises a vacuumizing device, at least one oil storage device, a vacuum pipeline, an oil injection pipeline and a plurality of oil injection stations. The vacuum pipeline comprises a vacuum header pipe connected with the vacuumizing device and a vacuum branch pipe connected with the vacuum header pipe; the oil injection pipeline comprises an oil injection header pipe connected with the oil storage device and an oil injection branch pipe connected with the oil injection header pipe; each oil injection station is provided with a corresponding vacuum branch pipe and an oil injection branch pipe. A blocking valve is arranged on the vacuum header pipe, and a vacuum valve and a pressure sensor are arranged on the vacuum branch pipe; a master control valve is arranged on the oil injection header pipe, and a manual valve, a branch control valve and a flow meter are arranged on the oil injection branch pipe; a photoelectric switch is arranged on the outer wall of the manual valve and used for sensing the opening and closing state of the manual valve. When the controller receives a manual valve opening signal detected by the optoelectronic switch, the man-machine interaction interface is unlocked, and vacuumizing quantitative oil injection operation is allowed to be executed.

The utility model relates to the technical field of three-way baffle valves, and discloses an improved three-way baffle valve for a waste heat boiler, which comprises a three-way valve body, two sides of the inner wall of the three-way valve body are fixedly connected with flow guide blocks, the inner side wall of the valve body is movably connected with a baffle rotating shaft through a bearing, and one end of the baffle rotating shaft is fixedly connected with a turntable. And a limiting pull rod is fixedly connected to the outer side wall of the rotating disc, a fixing frame is fixedly connected to the outer side wall of the three-way valve body, a servo motor is fixedly connected to the outer side wall of the fixing frame, and a one-way screw rod is fixedly connected to the output end of the servo motor. According to the improved three-way baffle valve for the waste heat boiler, through cooperative arrangement of the three-way valve body, the flow guide block, the baffle rotating shaft, the rotating disc, the limiting pull rod, the fixing frame, the servo motor, the one-way screw rod, the limiting moving block, the U-shaped limiting frame, the reset spring, the baffle and the flow guide sharp block, the effect of electrically and stably adjusting the three-way baffle valve for the waste heat boiler is achieved.

The utility model relates to the technical field of anti-blocking devices of separators, in particular to an anti-blocking device of a hydrogen sulfide rich gas separator, which is characterized in that a drainage pipe flange is connected with an inlet end of a block valve, and an outlet end flange of the block valve is connected with an inlet end of a flow limiting pipe. An outlet end flange of the flow limiting pipe is connected with the inlet end of a flow meter, an outlet end flange of the flow meter is connected with the inlet end of a guide pipe, a mounting box is integrally arranged on the right side of the inlet end of the flow limiting pipe, the upper end of the mounting box is detachably connected with a sealing cover, and the right side wall of the mounting box abuts against a connecting plate. The connecting plate is provided with two positioning holes arranged at intervals in the longitudinal direction, the inner wall of the right side of the mounting box is fixedly connected with two positioning studs correspondingly inserted into the positioning holes in a one-to-one mode, each positioning stud is in threaded connection with a nut abutting against the connecting plate, and the lower end of the connecting plate is integrally connected with a flow limiting hole plate matched with the inner wall of the flow limiting pipe. The sealing cover is connected with a cleaning device used in cooperation with the flow limiting hole plate.

The utility model discloses a fine adjustment slow closing type axial flow type check valve. The fine-adjustment slow-closing axial-flow type check valve comprises a valve body, a valve seat is arranged in the middle of the valve body, a valve clack is arranged on one side of the valve seat, a rear valve rod is arranged on one side of the valve clack, a rear valve sleeve is connected to the outer side of the rear valve rod in a sleeving mode, the rear valve sleeve is fixedly connected with the valve body, and a reset spring connected to the outer side of the rear valve rod in a sleeving mode is arranged between the rear valve sleeve and the valve clack. A front valve sleeve is arranged on the other side of the valve seat, the front valve sleeve is fixedly connected with the valve body and provided with a front pressing plate and a rear pressing plate, a buffer spring is arranged between the front pressing plate and the rear pressing plate, the valve clack is provided with a front valve rod used for extruding and pushing the rear pressing plate, and the front valve sleeve is in threaded connection with an adjusting bolt. The adjusting bolt extrudes the front pressing plate to enable the spring force of the buffer spring to act on the rear pressing plate attached to the front valve rod, and the spring force of the buffer spring is smaller than the spring force of the reset spring. The problems that in the prior art, pipeline pressure loss is large, and opening force is not easy to control are solved.