17245results about "Valve housings" patented technology

Embodiments include a choke system that passes enlarged debris despite having a relatively small diameter for an input port of the choke system. Embodiments also include systems to prevent dislodging of a choke seat when backpressure is supplied to the choke system. Embodiments also include sealing systems to prevent fluid leaks around the choke seat of the choke system.

The present disclosure discloses a valve with dual ball valves, including two ball valves arranged side by side and clamped with each other, wherein each ball valve includes a valve body, a ball body, a valve rod and a handle, clamping structures are respectively and correspondingly arranged on one surfaces of the two valve bodies abutting against each other, and each ball valve further includes a limiting seat, a first anti-misoperation device and a second anti-misoperation device. The first anti-misoperation devices ensure that the handles can be rotated freely only when the two ball valves are in a clamped state. The second anti-misoperation devices ensure that the handles can only be rotated when external force is applied to the handles. Misoperation on the valve is prevented through triple protection.

The dustproof valve comprises a valve device, a shutter protecting cover is connected to the front portion of the valve device, a rear connecting dust collecting frame is connected to the rear portion of the valve device, a valve shell is arranged in the valve device, a driving device is installed on the outer wall of the valve shell, even number of valve inner guide blocks are installed in the valve shell, and valve bodies are arranged between the even number of valve inner guide blocks. When the valve body is opened, the valve body is driven by the driving device, so that the valve body is reset to a 90-degree horizontal ventilation state after being opened and closed by 135 degrees, a sliding frame connected with an ejector rod is jacked by a lower top sealing plate on a side sliding rail by the same degree and then is reset synchronously, a dust screen in a dust screen winding drum is stretched in the jacking and resetting process, and the dust screen is prevented from being blocked. According to the dust-proof net, the net body is matched with the cleaning assembly to form brushing, dust adhering to the surface of the net body falls into the collecting box to be collected under brushing, then dust cleaning work on the dust-proof net is completed under the condition that the dust-proof net is not disassembled, and the normal operation state of the air volume and the ventilation system in the long-time use state is ensured.

The present application relates to a kind of water diversion valve and the cleaning machine of application have the water diversion valve, water diversion valve includes shell, fixed seat, movable column, drive assembly, shell has first water outlet, second water outlet, water diversion cavity is vertically arranged with the partition plate that it can be separated into corresponding first cavity of first water outlet and corresponding second cavity of second water outlet, the bottom of partition plate is provided with the opening that can be connected with first cavity and second cavity;The top of movable column is provided with the sealing plug that can be closed second water outlet when it rises to the top of second cavity, and the opening is closed when it falls to the bottom of second cavity.This application water diversion cavity of water diversion valve is directly connected with the water outlet of cleaning machine, improves the sealing performance of junction;The sealing plug of the present application is opened and closed alternately to first water outlet and second water outlet by movable column lifting, realizes the independent, absolute sealing of first water outlet and second water outlet, improves the sealing property and reliability under water diversion state, is conducive to improving water diversion effect.

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 special working condition corrosion-resistant valve and relates to the technical field of valves, the special working condition corrosion-resistant valve comprises a valve body, a valve rod, a butterfly plate and a transmission device, and a valve seat containing cavity is defined by a limiting ring and a valve seat gland in the valve body on one side of the butterfly plate; a valve seat which can only slide in the axial direction of the valve body slides in the valve seat containing cavity in a sealed mode, and the whole valve seat is completely contained in the valve seat containing cavity. A metal sealing ring is fixedly installed on the outer periphery of the butterfly plate, and a valve seat sealing face matched with the metal sealing ring in a sealing mode is arranged on the inner side of the valve seat. And an elastic element is arranged between the valve seat and the valve seat gland. According to the three-eccentric butterfly valve, through the collaborative design of the three-eccentric structure, the hidden valve seat, the L-shaped fluid channel and the self-adaptive plugging assembly, the advantages of the three-eccentric butterfly valve are reserved, the defect of exposed design of a traditional valve seat is overcome through structural innovation, and it is ensured that the valve is accurate in action and reliable in sealing in the opening and closing process; and the sealing structure is particularly suitable for special working conditions with strict requirements on sealing performance and service life.

A multi-way valve includes a valve seat and a valve core. The valve core is rotatably disposed in the valve seat, the valve seat is provided with a plurality of valve port groups, each valve port group includes a plurality of valve ports, the valve core is provided with communication structure groups corresponding to the valve port groups, respectively, and each of the communication structure groups further includes a plurality of communication structures arranged along a circumferential direction of the valve core. When the valve core is rotated to different rotation positions, valve ports in different valve port groups form different communication states. Only one valve core is required to make a two-way proportional valves, three-way proportional valve, and a four-way proportional valve achieve different communication states, with simple control, compact structure and low cost.

The invention particularly relates to a double-sealing special-shaped ball valve which comprises a valve body, a valve rod rotating and lifting operation mechanism movably installed at the top of the valve body and a connector arranged at the bottom end of the valve rod rotating and lifting operation mechanism. A notch is formed in the top of the special-shaped ball valve clack movably installed in the valve body and can be tensioned, a thin-layer slotting plate part is arranged at the bottom of the special-shaped ball valve clack, deformation is easier, a side through opening is formed in the middle of the special-shaped ball valve clack and used for switching rapid water passing, and therefore the whole structure is an inverted-C-shaped special-shaped ball, and the special-shaped ball valve has the high opening and contracting functions. The left side and the right side of the special-shaped ball valve clack shrink and deform towards the middle portion, the two inclined holes close the notch in the top of the special-shaped ball valve clack, so that the second sealing gasket is separated from the first sealing gasket, and at the moment, in the whole rotating opening and closing process of the valve, the second sealing gasket of the special-shaped ball valve clack and the first sealing gasket of the connecting pipe do not rub; the service life is long.

A multi-way valve adapted to control a flow of fluid to different thermal fluid circuits includes a valve housing, a valve flow controller, and a sealing system. The valve flow controller is arranged in the valve housing to control flow through the valve housing. The sealing system is configured to seal between the valve housing and the valve flow controller.

The invention relates to the technical field of industrial automation and control, and discloses a top-mounted high-temperature-resistant hard sealing ball valve and a self-adaptive dynamic control system of the top-mounted high-temperature-resistant hard sealing ball valve. The system aims at solving the technical problem that due to the fact that fixed driving torque is adopted, the sealing face of the valve is excessively abraded or the risk of heat jamming exists. The system is characterized by comprising a multi-point distributed sensing subsystem, a valve dynamic control unit and an intelligent electric actuating mechanism. A hybrid torque prediction model based on physical information and data driving is arranged in the valve dynamic control unit, the optimal torque is predicted in real time through sensing data, an executing mechanism is driven to respond dynamically, and the valve dynamic control unit has the online self-learning capacity. Accurate prediction and dynamic adjustment of the valve operation torque can be achieved, overstress damage is effectively avoided, the self-adaptability and generalization ability of the system are improved, and the service life of the valve is prolonged.

The invention discloses a pilot valve control method and device based on data detection and automatic pressure regulation, and relates to the technical field of pilot valves. The method comprises the steps that the medium pressure of a piston containing cavity is obtained in real time through a pressure sensor, and the displacement amount of a piston shaft is obtained in real time through a displacement sensor; querying a pre-stored pressure-displacement correlation curve based on the medium pressure to determine a target displacement amount; generating an adjusting signal according to the deviation data of the real-time displacement and the target displacement; and the pressure regulating component is controlled to dynamically regulate the pretightening force of the spring to realize pressure closed-loop control. The device comprises a mechanical execution unit, a data detection unit and a control processing unit, all the units work cooperatively, closed-loop control over pressure adjustment is achieved by detecting medium pressure and piston shaft displacement in real time and dynamically adjusting spring pre-tightening force, and the device has the advantages of automatic calibration, manual intervention reduction and control precision improvement.

The utility model discloses a self-cleaning ore pulp knife gate valve, which relates to the technical field of valves, and comprises a valve body, a valve plate, a valve rod and a driving mechanism, the valve body is provided with a medium flow channel, the valve plate is inserted in the medium flow channel, the upper end of the valve body is provided with a through groove, the upper end of the valve plate penetrates through the through groove and is connected with the valve rod, the upper end of the valve rod is connected with the driving mechanism, and the valve rod is connected with the driving mechanism. A valve seat assembly is arranged in the medium flow channel and comprises an elastic sealing ring and an elastic annular scraper, the section of the front end of the elastic sealing ring and the section of the front end of the elastic annular scraper are in an arc shape and extend in the opposite directions, and the elastic sealing ring is in sealing fit with the valve plate. When the valve plate moves up and down, the elastic annular scraper can scrape silt, particulate matter and the like attached to the surface of the valve plate, the valve plate is kept clean, the service life of the valve is prolonged, the elastic sealing ring conducts elastic sealing compensation on the sealing face, the sealing face and the valve plate are kept sealed all the time, and the sealing reliability of the valve is guaranteed.

The invention belongs to the technical field of regulating valve noise reduction, and particularly relates to a sleeve multi-stage noise reduction regulating valve system which comprises a sleeve multi-stage noise reduction regulating valve, a pneumatic diaphragm actuator, an air source control device, an intelligent control device, a butterfly valve, a reducing joint, a companion flange and a user pipeline. The sleeve multi-stage noise reduction regulating valve comprises a valve body. When fluid enters the valve, water flow is preliminarily dispersed through the first noise reduction holes in the outer layer, direct impact of the fluid on the valve body is reduced, noise is lowered, the water flow enters the upper sleeve and then falls onto the inclined buffer baffles, the buffer baffles are arranged in an up-and-down alternate multi-layer mode, and therefore the situation that the water flow vertically falls down and directly flushes the valve body is avoided, and noise is further lowered; and then the water flow passes through the second noise reduction hole in the inner layer, the water flow is further dispersed, direct impact of the fluid on the valve body is reduced again, formation of turbulent flow can be effectively restrained through the first noise reduction hole with the variable diameter, the second noise reduction hole with the variable diameter and the inclined buffering baffle, and therefore noise is reduced.

The invention discloses a reverse anti-blocking check valve, and relates to the technical field of valve bodies, the reverse anti-blocking check valve comprises a check valve body, and an expansion part is arranged on the surface of a valve plate, facing the fluid direction, of the check valve body; the expansion component comprises a bearing column fixed to the center axis of the surface of the valve plate, and a limiting ring is fixed to the axial top end of the bearing column. The expansion part is arranged on the incident flow side of the valve plate, the dynamic response function in the valve opening and closing process is achieved, when fluid is impacted in the forward direction, the expansion part is unfolded under the fluid pressure effect, the contact arc plate is automatically attached to the inner wall of a pipeline, an auxiliary sealing ring is formed, and the sealing performance is effectively improved; when the fluid pressure is weakened, the expansion component retracts by means of the spring, so that the contact arc plate is separated from the inner wall of the pipeline and generates relative motion, the cleaning effect similar to that of a scraper is achieved, dirt attached to the pipe wall and the surface of a key structure can be effectively peeled off, and the self-cleaning capacity and the anti-blocking effect of the valve are improved.

The present invention relates to the technical field of valves, and disclosed is a butterfly valve for use in ultra-low temperature environment. The butterfly valve comprises a valve body (1), a butterfly disc (2) in the valve body (1), a valve seat (3) matching with the butterfly disc (2), a valve stem (4) fixed to the butterfly disc (2), and an operating assembly (5) for driving the valve stem (4) to rotate, wherein a manhole (11) and an observation cover (12) covering the manhole (11) are provided on the valve body (1), and the observation cover (12) is detachably connected to an outer edge of the manhole (11) on the valve body (1); a cleaning assembly (6) is provided on an outer side face of the valve body (1), and the cleaning assembly (6) comprises a cleaning member (61) located above the observation cover (12) and a driving member (62) for driving the cleaning member (61) to slide back and forth on an upper side face of the observation cover (12); and an operating wheel (51) rotates to drive the driving member (62) to operate, and one side of the cleaning member (61) abuts against the upper side face of the observation cover (12), which reduces the difficulty of maintenance of the butterfly valve and improves the efficiency of maintenance of the butterfly valve. In addition, the rotation of the operating wheel (51) can drive the driving member (62) to operate, which in turn drives the cleaning member (61) to clean an outer surface of the observation cover.

The utility model provides a quick-connection ball valve which comprises two ball valves, the two ball valves are in linear clamping connection, each ball valve is provided with a through hole for fluid to pass through, each ball valve comprises a valve body, a valve element is arranged in each valve body, each valve element is connected with a valve rod, the end, away from the corresponding valve element, of each valve rod extends out of the corresponding valve body, and the end, extending out of the corresponding valve body, of each valve rod is connected with a handle. The handle drives the valve element to rotate through the valve rod. And the valve body is provided with a locking device. The locking device comprises a locking groove and a locking column; the handle is in driving connection with the locking column. When the handle is closed, the locking column is arranged in the valve body; when the two ball valves are in butt joint and the handle is opened, the handle drives the locking column to stretch into the locking groove of the other ball valve, the locking device locks the two ball valves, the two ball valves are prevented from rotating and disengaging, fluid leakage caused by looseness is avoided, and the safety of valve body connection is improved.

The invention discloses an underground water collecting device for underground water sample detection, which comprises a fixing frame and a sampling mechanism, the sampling mechanism comprises a sensing part and a collecting part, and the sensing part comprises a mounting cylinder, a sealing head, a spring part and an adjusting part; the collecting part comprises a sampling cylinder, a floating ball and an inner sealing ring; the sealing head is movably and hermetically connected to one side of the bottom of the mounting cylinder; the spring piece is arranged in the mounting cylinder and used for applying pressure to the sealing head, and the adjusting piece is used for adjusting the pressure; the sampling cylinder is fixedly connected with the mounting cylinder, and a sealable discharge outlet is formed in the bottom of the sampling cylinder; a water inlet channel is arranged between the sampling cylinder and the mounting cylinder; the inner sealing ring is movably connected in the sampling cylinder in a sealing manner, and the floating ball is movably arranged in the sampling cylinder and connected with the inner sealing ring. By means of the design, water samples at different depths can be collected, repeated collection is not needed, and the collection efficiency is improved.

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.

A faucet including a bottom support, a spout body coupled to the bottom support, the spout body having an internal opening extending from a top surface to a bottom surface of the spout body, a spout tube extending upward from the spout body. The spout tube can be received at least partially within the spout body. The faucet further includes a rotatably flexible spray head having a first spray head tube coupled to a second spray head tube via a pivot element. The pivot element enables rotation of the second spray head tube relative to the first spray head tube to provide movement of the spray head in multiple directions. The first spray head tube generally remains stationary during rotation of the second spray head tube. The faucet can actuate between a lowered position and one or more raised positions, without external intervention.

The invention relates to the technical field of ball valves, and discloses a ball valve butt joint structure which comprises two ball valve assemblies in coaxial butt joint, each ball valve assembly comprises a valve body, a valve element and a valve rod, each valve element is movably arranged in the corresponding valve body, one end of each valve rod penetrates through the corresponding valve body and is fixedly connected with the corresponding valve element, and the other end of each valve rod extends out of the corresponding valve body and is sleeved with a gear. The butt joint end face of each valve body is provided with a rack extending in the circumferential direction, and the rack of one ball valve assembly can be meshed with the gear of the other ball valve assembly. A limiting pin is elastically connected into at least one valve body, a limiting hole matched with the limiting pin is formed in the butt joint face of at least another valve body, the limiting pin can move between a locking position and an unlocking position in the axial direction relative to the valve bodies, the limiting pin is inserted into the limiting hole in the locking position, and the limiting pin is disengaged from the limiting hole in the unlocking position. According to the ball valve butt joint structure, locking and opening of the two ball valve assemblies can be completed only through two actions, and operation is rapid and convenient.

The invention discloses an efficient sealing valve in a high-pressure environment, and relates to the technical field of sealing valves. Comprising a main body, a filter plate is fixed in the main body, a cleaning assembly driven by a motor is arranged on one side of the filter plate, an opening and closing assembly is arranged at the bottom of the cleaning assembly, a blocking assembly is arranged in a limiting frame, and the blocking assembly is rotationally connected with a first blocking plate and a second blocking plate. According to the device, a second bevel gear rotates to drive a connecting shaft to rotate, then a first fixing rod and a second fixing rod are driven to move in cavities formed in the two sides of the interior of a connecting frame, and therefore a rotating shaft and a rotating ring are driven to rotate; the first blocking plate and the second blocking plate rotate to block the residual oil sample, so that the effect of preventing the residual oil sample from slowly seeping out of the nozzle due to the release of system pressure or the action of self gravity after the valve is closed is achieved.

The invention relates to the technical field of valves, in particular to an anti-leakage gate valve and a sealing assembly thereof, the sealing assembly comprises a mounting ring, a rigid sealing ring and a first driving assembly, a medium channel is formed in a valve body, a gate plate is arranged in the medium channel in a sliding mode, the gate plate or closes the medium channel, and a valve rod is connected to the valve body. One end of the valve rod is located outside the valve body. The mounting ring and the first driving assembly are arranged, when a rigid sealing ring needs to be replaced, a worker pokes a rotating disc with hands, and through transmission cooperation of a transmission rod, a transmission gear, a transmission gear ring, a tray and a transmission unit, the rigid sealing ring can move in a ring groove along the axis of the ring groove; therefore, the rigid sealing rings on the outermost sides of the two annular grooves can be switched, and due to the fact that workers do not need to disassemble the valve body in the process of replacing the rigid sealing rings, the workload of the workers can be greatly reduced.

The utility model relates to the technical field of valves, in particular to an adjustable flow valve which comprises a valve assembly, the upper end of the valve assembly is fixedly connected with a flow control assembly, the inner side of the valve assembly is rotatably connected with a protection assembly, the valve assembly comprises a valve shell, and a double-column hole is formed in the inner side of the valve shell. The inner side of the double-column hole is fixedly connected with a second rubber sealing ring and a first permanent magnet, the protection assembly comprises an arc-shaped plate, a hollow groove is formed in the inner side of the arc-shaped plate, one side of the arc-shaped plate is fixedly connected with a rotating column, the top end and the bottom end of the rotating column are both fixedly connected with second permanent magnets, and the outer side of the rotating column is fixedly connected with a second bearing. According to the device, the fluid is prevented from directly impacting the pipeline, the fluid speed and impact force are controlled, noise and vibration generated by high-speed fluid due to the throttling effect are effectively reduced, and the risks of mechanical fatigue and damage are reduced.

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.

A gas supply control device that supplies a gas to a processing chamber in which a workpiece is processed, includes: a first port connected to a gas source of a purge gas; a second port to which a gas source of a processing gas is connected; a collective pipe in which each of the purge gas and the processing gas supplied from the first port and the second port merges, respectively, and flow; a first flow rate controller provided between the first port and the collective pipe; and a second flow rate controller provided between the second port and the collective pipe. A gas flow path through which the purge gas flows is provided from an output side of the first flow rate controller to an input side of the second flow rate controller.

The utility model provides a mouth wash flow adjustable faucet. The mouth wash flow adjustable faucet comprises a faucet body, a change-over switch and an adjusting switch. The faucet body is provided with a water inlet channel, a mounting cavity and two water outlet channels which are communicated with each other, and a water outlet of one of the water outlet channels forms a top water outlet. The change-over switch is installed in the installation cavity, and the water inlet channel communicates with any water outlet channel through the switching action of the change-over switch. The adjusting switch is installed on the faucet body, and the water outlet flow of the top water outlet is controlled through the adjusting action of the adjusting switch, so that the water outlet height of the top water outlet can be adjusted to adapt to using habits of different consumers. The faucet provided by the utility model not only is provided with the top water outlet for discharging mouth wash, but also is provided with the adjusting switch for flexibly adjusting the water outlet amount and the water outlet height of the mouth wash, so that the requirements of users with different heights are met, or the requirements of the same user under different use conditions are met.

A valve device is provided. The valve device includes a valve body unit, a mounting seat and a valve seat. The valve device further includes a fastening member. The mounting seat is provided with a limiting step, and a side surface of the valve seat is provided with a connecting hole in communication with the mounting hole along a direction perpendicular to an axis of the mounting hole. And an end of the fastening member extends into the mounting hole from the connecting hole and abuts against the limiting step.

The invention relates to the technical field of valves, in particular to a metal hard sealing ball valve which comprises a main valve body structure and a sealing adjusting structure. The main valve body structure comprises a valve shell, a ball assembly and a valve seat assembly, and the sealing adjusting structure comprises an elastic compensation unit and a guide supporting unit. A hardening treatment layer and a micro-convex texture structure are arranged on the outer surface of the ball assembly, and a flexible filling material is embedded in a sealing ring on the inner side of the valve seat assembly. The elastic compensation unit dynamically adjusts the position of a valve seat through a spring assembly, and the guide supporting unit ensures movement stability. The inner wall of the valve shell is provided with a diversion trench to optimize a fluid path, and the outer wall of the annular valve seat is provided with radiating fins to improve high-temperature resistance. The sealing performance can be remarkably improved, friction and abrasion are reduced, the fluid scouring influence is reduced, the leakage problem under the high-pressure or high-temperature or high-abrasion working condition is solved, and the service life is prolonged.

The invention relates to the technical field of valves, in particular to a buffering device for a valve, which comprises a valve body, a valve core and a valve seat are arranged in the valve body, a support is detachably arranged in the valve seat, a rotating frame is rotatably arranged on the support, more than two self-adaptive rotating shafts are arranged on the rotating frame along the circumferential direction, and the self-adaptive rotating shafts are arranged along the radial direction of the rotating frame. The two ends of the self-adaptive rotating shaft are connected with the buffer blade and the swing crank respectively, the rotating frame is detachably provided with a variable-pitch damper, the variable-pitch damper is connected with the self-adaptive variable-pitch disc, the self-adaptive variable-pitch disc is provided with a limiting rail, the swing crank is in sliding connection with the limiting rail, and the spiral angle of the buffer blade is in positive correlation with the elastic force of the variable-pitch damper. According to the buffering device for the valve, by designing the buffering device capable of adaptively changing the buffering resistance and used for the valve, the problem that a valve element is prone to being damaged during valve switching is solved, and the defect that the performance of the valve is reduced due to the adverse effect of a traditional buffering structure on the flow speed and uniformity of fluid is overcome.