31results about How to "Realize the pressure relief function" patented technology

The invention provides a pressure cooker which comprises a cooker body and a cooker cover. An exhausting hole and a pressure relief valve are arranged on the cooker cover, and the pressure relief valve is arranged on the exhausting hole. The pressure cooker is also provided with a pressure relief driving device for driving at least part of pressure relief valve to break away from the exhausting hole, a switch device for controlling the pressure relief driving device and a switch reset device capable of switching from a closed state to an opened state. By arranging the pressure relief driving device, the switch device and the switch reset device, a pressure relief function can be achieved by shifting the switch device in the using process of a user, resetting of the switch device can be also automatically achieved in the uncovering process, and the user is prevented from forgetting opening the switch device.

The invention discloses a reactor shielding, coolant pressure relief and containment suppression compound device. The reactor shielding, coolant pressure relief and containment suppression compound device comprises a ring-shaped shielding layer which is arranged in a containment, surrounds a pressure vessel and adopts a closed structure, the housing of the ring-shaped shielding layer comprises shielding steel plates, and the ring-shaped shielding layer accommodates shielding water and is provided with a suppression pipeline used for communication between the atmosphere of the containment and the shielding water, and the ring-shaped shielding layer is also provided with a pressure relief pipeline used for leading a coolant in the pressure vessel into the shielding water and a water drainage pipe used for discharging water into a reactor cavity. The reactor shielding, coolant pressure relief and containment suppression compound device can achieve the functions of reactor shielding, coolant pressure relief, containment suppression and water discharge into the reactor cavity.

The invention relates to a novel blowout-prevention and anchoring integrated tool. The tool comprises an anti-rotation part, a releasing part, a pressure relief channel part, an anchoring part, a gravity valve part and a through rod, wherein the anchoring part comprises a supporting slip; an upper joint of an anti-rotation anchor is connected with the lower end of a screw pump; a lower joint of the anti-rotation anchor is connected with a sieve pipe; the lower end of the sieve pipe is connected with a connecting joint of a releasing packer; the lower end of a connecting rod is connected with the through rod; an upper joint of a pressure relief channel is connected with a lower joint of the releasing packer; an upper joint of the supporting slip is connected with a lower joint of the pressure relief channel; an upper joint of a gravity valve is connected with a central pipe of the supporting slip; and a lower joint of the gravity valve is connected with an oil pipe through threads. According to the novel blowout-prevention and anchoring integrated tool, the anti-rotation effect is more ideal, the failure caused by insufficient engagement force after the long-term use of the releasing packer is prevented, the danger of upward channeling of a tubular column during operation can be avoided through the pressure relief channel part, and the failure of a float switch caused by sand sinking accumulation of a fractured well can be avoided.

The invention provides a solenoid valve structure with a pressure relief mechanism. The structure comprises a cylinder cover, a valve sleeve, a magnetic core and the pressure relief mechanism, an oilinlet is formed in the cylinder cover, a by-pass oil passage is formed between the cylinder cover and the valve sleeve, and a control oil passage and a pressure relief oil passage are formed in the socket section between the valve sleeve and the cylinder cover separately; the pressure relief mechanism is arranged between the magnetic core and the valve sleeve, and a movable connecting structure sliding relative to the straight line is formed between the pressure relief mechanism and the valve core; the solenoid valve is powered off, and the engine oil pressure of the control oil passage is higher than set pressure of the pressure relief mechanism, the pressure relief mechanism is pushed open by engine oil, and the oil inlet, the by-pass oil passage, the control oil passage and the pressurerelief oil passage are communicated; when the solenoid valve is energized, the pressure relief passage is closed, and the oil inlet, the by-pass oil passage and the control oil passage are communicated. Accordingly, abnormal action, caused by oil pressure fluctuation, of a cylinder deactivation rocker can be avoided, the cylinder deactivation function requirements can be met by adopting a singleoil passage tappet, and the structure has the prominent advantages of simplifying the oil passage structure, lowering the cost, improving the work reliability and the like.

The invention discloses an integrated type anti-freeze and pressure relief valve. The integrated type anti-freeze and pressure relief valve comprises a valve body 1. The valve body 1 is internally provided with a water channel 2 allowing water to flow through. An anti-freeze assembly which can block the water channel 2 is arranged on the valve body 1, and when the environment temperature is lower than the set temperature, the anti-freeze assembly automatically opens the water channel 2 to conduct water draining. Before the temperature of a water route system of a water heater reaches the critical crystallization temperature, the water route system is made in a flow state through the integrated type anti-freeze and pressure relief valve; and after a water route absorbs enough heat energy carried by flowing water and friction heat produced by relative flow, the water route system can be above a critical crystallization temperature point all the time, and freezing and frost cracking of the water route system can be prevented. The valve body 1 is further provided with a pressure relief device which can block the water channel 2, when the water pressure of the water route is higher than the set value, the pressure relief device automatically opens the water channel 2 to conduct water draining and pressure reduction, and thus, the anti-freeze and pressure relief functions are achieved at the same time; and the integrated type anti-freeze and pressure relief valve is simple in structure, safe, reliable and convenient for households to install and use.

The invention discloses a cup lid assembly, a mixing cup assembly and a food processor. The cup lid assembly is used in a food processor; the food processor comprises a stirring cup, and a sealing member is disposed between the cup lid assembly and the stirring cup; The cup lid assembly comprises a lid body, the lid body is closed to the stirring cup, and the lid body is provided with an air passage port communicating with the stirring cup, and the lid body is a plastic part; and a pressure release valve; the pressure release valve comprises a chamber, a valve body, and an elastic member. Thechamber is provided with an air inlet and an air outlet, the air outlet is connected to the air passage port, partial valve body is located in the air inlet, and is elastically connected to the outerwall of the chamber by the elastic member. The valve body slides relative to the air inlet to elastically open or block the air inlet. The cup lid assembly of the technical solution of the present invention is provided with a pressure release valve, which can perform a pressure relief function on the stirring cup, and the pressure release valve has a simple structure and is easy to operate.

The invention discloses a fireproof door for preventing and controlling a mine fire. The fireproof door comprises a door body and a manhole penetrating through the door body, wherein two sliding doorsare arranged in the door body, and the sliding doors are parallel to the door body and are slidably connected to the bottom of the manhole; the tops of the two sides of the door body are jointly connected to an air flow adjusting device and a pressure relief device; the two sliding doors are respectively arranged on the two sides of the door body, each sliding door communicates with a flow adjusting chamber on the same side of the door body and hermetically communicates with an airflow channel, and the joint of each airflow channel and the corresponding flow adjusting chamber is located in aspace below a partition plate in the corresponding flow adjusting chamber. According to the fireproof door for preventing and controlling the mine fire, two airflow flowing effects are formed by the air flow adjusting device and the pressure relief device, and the flow rates of the air flow adjusting device and the pressure relief device are different, so that a stable airflow flowing trend is formed in a plane, smoke and heat flow impact the fireproof door, flows in a direction parallel to the fireproof door and then flows out to form an airflow circulating process, the smoke is fully in contact with an activated carbon layer to absorb harmful substances, the airflow is guided conveniently, and fire extinguishing is facilitated.

The invention discloses a high-circulating easily regulated pilot-operated type piston valve. A valve body comprises an outer shell and an inner shell, wherein a shuttle-type gradient curved cone structure is adopted at one end of the inner shell close to an inlet of the valve body; an annular channel is formed between the outer shell and the inner shell; the outer shell is connected with the inner shell through a streamline type guide plate; an adjusting drum is mounted between the inlet and outlet in the valve body; the adjusting drum is connected with one end of a crank-link mechanism; the other end of the crank-link mechanism is connected with a piston mechanism located on the outer side of the valve body. The high-circulating easily regulated pilot-operated type piston valve can adapt to a high-pressure-difference current-adjusting and pressure adjusting working condition and has the advantages of small flow resistance, excellent adjusting property, small size and light weight.

The invention discloses a one-way automatic decompression valve structure for an escape capsule and relates to a one-way automatic decompression pipeline of an underground escape capsule of a coal mine. The one-way automatic decompression valve structure comprises a valve body (2), an aluminum valve core (3), a spring (4) and an inner adjusting screw (5). A cavity is arranged in the valve body (2), and an air inlet (1) and an air outlet (8) for air flow to go in and out are formed in the outer wall of the cavity. The aluminum valve core (3) is arranged in the valve body (2), and the periphery of the end portion of the aluminum valve core (3) butts against a step on the inner side of the air inlet (1). The inner adjusting screw (5) is arranged in a hole in a valve cover at the upper end of the valve body (2), and the spring (4) for butting the aluminum valve core (3) tightly is arranged below the inner adjusting screw (5). By means of the one-way automatic decompression valve structure, the problem that the underground escape capsule of the coal mine lacks the decompression valve which is reasonable in structure and good in sealing performance and safety and used for the decompression pipeline is solved.

The invention discloses an intelligent anti-explosion explosion-venting cover plate assembly used for pipe rack and considering civil defense design. An intelligent anti-explosion explosion-venting cover plate module for a feed port comprises a cover plate door frame module, a cover plate body module, a ventilating anti-explosion explosion-venting orifice module, a cover plate monitoring control module, and other modules; the ventilating anti-explosion explosion-venting orifice module can switch a cover plate among venting mode, anti-explosion mode and explosion-venting mode, corresponding to daily pipe rack ventilation, wartime pipe rack disaster-preventing (preventing external shock wave) and pipe rack internal relief passage (explosion-venting port) respectively, the cover plate monitoring control module provides recording and calculating, and analyzes the state of the anti-explosion explosion-venting cover plate. The cover plate monitoring control module includes a pressure monitoring module, an angle sensor and the like, is capable of judging working condition of the cover plate, an orifice and the like, and automatically, quickly and accurately detecting the properties of the intelligent anti-explosion explosion-venting cover plate online, subsequent regular maintenance is facilitated, and good operation state and protection are ensured.

The invention provides a pressure relief controlling regulating valve with pressure capable of being visible. The pressure relief controlling regulating valve comprises an upper valve body and a lower valve body, wherein the upper valve body and the lower valve body are fixedly connected; an isolation plate is arranged in the middle of lower valve body; a portion, connected with a left connecting opening and a right connecting opening, of a cavity is divided into two independent cavities by the isolation plate; the position, below an upper connecting opening of the lower valve body, of the isolation plate is of a horizontal structure; a water flowing hole facing the upper connecting opening directly is arranged on the horizontal position of the isolation plate; an outer pressure valve element capable of sliding up and down is installed inside an installing hole of the upper valve body; an inner regulating valve element is installed in the middle of the outer pressure valve element in a sliding and sealing mode; the water flowing hole is a cylindrical hole; the lower portion of the inner regulating valve element and the water flowing hole are assembled in a sliding and sealing mode; and the inner regulating valve element is connected with a pipe thread in a threaded mode. When the valve is in use, the water pressure inside the lower valve body can be convenient to observe for people through a lower scale of the outer pressure valve element. The quantity of pressure relief can be adjusted by adjusting the height of the inner regulating valve element.

The invention provides an oil drain device. The oil drain mode of an existing oil drain device of an oil field is mostly that a sucker rod descends to shear off a pin to open an oil drain channel, and oil drain cannot be completed if the sucker rod is subjected to breakage, disengagement, wax precipitation, scale formation or oil thickening. According to the technical scheme, the oil drain device is characterized in that an oil drain device body is composed of an upper connector, a working pipe and a lower connector; the upper connector and the lower connector are fixed to the tow ends of the working pipe; the working pipe is composed of a central pipe body and a working pipe shell; the working pipe shell is provided with an oil drain opening; a spring and a piston are arranged in a center circle clearance formed by the working pipe shell and the central pipe body; the piston is provided with a deblocking pin perpendicular to the movement direction of the piston; and the central pipe body is further provided with a pressure inlet hole. The oil drain device has the advantages that pressure is applied into a well to shear off the pin to open a pressure relief channel, the pressure relief function is achieved, and the problem that oil drain cannot be completed due to the fact that the sucker rod is subjected to breakage, disengagement, wax precipitation, scale formation or oil thickening is solved. The oil drain device further has the characteristics that the situation that environmental pollution and unnecessary losses are caused due to the fact that oil falls on the ground when an oil pipe is pulled can be avoided.

The invention discloses a diesel engine seawater pump which comprises a pump body with a water inlet cavity and a water outlet cavity, and a bypass valve is arranged between the water inlet cavity and the water outlet cavity. A water inlet of the bypass valve is communicated with the water outlet cavity, and a water outlet of the bypass valve is communicated with the water inlet cavity. The bypass valve comprises a valve body, a valve core and a spring, wherein the valve core and the spring are arranged in a cavity of the valve body, the water inlet is located at one end of the valve body, the water outlet is located on the side wall of the valve body, and the valve core shuts off the water inlet of the valve body under the support of the spring. The seawater pump can always supply sufficient cooling water when a diesel engine operates at various rotating speeds, so as to maintain normal water pressure and ensure the normal cooling of the diesel engine. The invention also discloses a diesel engine with the seawater pump.

The invention discloses an underground pressure release valve and a hydraulic shaping pipe column. The underground pressure release valve comprises an outer sleeve, a valve seat, a valve element and apiston connecting piece, wherein a liquid outlet hole is formed in the outer sleeve, the valve seat is fixed in the outer sleeve and is in sealing fit with the outer sleeve, a pressurizing channel and a pressure release channel are formed in the valve seat, the piston connecting piece can move downwards along with a piston of a hydraulic booster when pressurizing the interior of the outer sleeve,a transmission relation is established between the piston connecting piece and the valve element when the piston connecting piece moves downwards by a certain distance, and the valve element is disengaged from the valve seat to communicate the pressure relief channel. According to the underground pressure release valve, when the piston connecting piece descends to a certain position, the valve element can be automatically driven to be disengaged from the valve seat, the pressure release channel is connected, then the hydraulic shaping column automatically releases pressure, the whole pressurerelease process is conducted underground, frequent pressure rising and releasing on the ground manually are not needed, the pressure release speed is high, the process is safe and reliable, manpowerand material resources can be saved, and pipe column shaping efficiency can be improved.

Pressure relief valve comprising a valve housing, in which a double-side operable cylindrical pressure relief valve spool is housed slidable along a longitudinal axis of a cylindrical bore in the valve housing. The pressure relief valve spool can be shifted into a first position by a first force acting on an actuating side of the pressure relief valve spool and can be shifted into a second position by a pressure force acting on a sealing side of the pressure relief valve spool. On the sealing side of the pressure relief valve spool a double-sealing, rotational symmetric poppet is located having a rotational axis, a first convex sealing surface and a second convex sealing surface. The first sealing surface facing away from the pressure relief valve spool is provided for sealing with an external valve seat. The second sealing surface facing to the stepped bore in the valve spool is provided for sealing with the smaller diameter of the stepped bore. The poppet and the rotational axis of the poppet are tiltable with respect to the longitudinal axis of the cylindrical bore in the pressure valve housing.

The invention discloses a one-way valve for a die clamper. The one-way valve comprises a valve body. A valve cavity is formed in the valve body and comprises a first valve cavity body and a second valve cavity body. A gas channel communicated with the first valve cavity body is arranged at the top of the valve body. A piston and a piston rod connected with the piston are arranged in the first valve cavity body. The piston rod is in sliding fit with the valve body. A steel ball seat is arranged in the second valve cavity body. A fluid channel is formed in the steel ball seat. A steel ball and a spring are arranged in the fluid channel. The oil inflow end of the fluid channel is sealed through the steel ball. An oil inflow channel is arranged on one side of the valve body. An oil outflow channel is arranged on the other side of the valve body. When the piston slides towards the steel ball, one end of the piston rod pushes the steel ball to be away from the oil inflow end of the fluid channel; when the one-way valve works normally, oil flows in through the oil inflow channel, passes the fluid channel and flows out of the oil outflow channel; and when an abnormal condition occurs and no oil flows in, the fluid channel is sealed through the steel ball, the oil cannot flow to the oil inflow channel through the oil outflow channel, and the pressure maintenance effect is achieved.

The invention relates to the field of tire forming, and discloses an integrated hydraulic system and a tire vulcanizing machine. The integrated hydraulic system comprises a hydraulic pump source, a control valve block and an executing mechanism, the executing mechanism comprises an integrated oil cylinder and a liquid filling unit, the integrated oil cylinder comprises a cylinder body, a static piston rod and a movable piston rod, the static piston rod is fixedly arranged in the cylinder body, the movable piston rod is arranged in the cylinder body in a sliding mode and matched with the static piston rod in a sliding mode, a rodless cavity and a rod cavity are formed between the movable piston rod and the cylinder body, a fast forward cavity is formed between the movable piston rod and the static piston rod, the liquid filling unit is used for supplying hydraulic oil to the rodless cavity, and the hydraulic pump source supplies the hydraulic oil to the rod cavity, the rodless cavity and the fast forward cavity through a control valve block. The system is compact in structure, reduces the occupied space, is simple and convenient to install, improves the working efficiency, provided with few pipeline connecting points, is low in leakage probability of the hydraulic oil, realizes quick die assembly without additionally outputting flow by an oil pump, reduces the cost and energy consumption, and reduces noise.

The invention discloses a pressure relief and water replenishing valve. The pressure relief and water replenishing valve comprises a valve body housing, wherein a water replenishing channel and a water supply and overflow channel are formed in the valve body housing, a valve element assembly is arranged on the valve body housing, the valve element assembly comprises a water replenishing port rubber mat and a valve rod, and a pressure relief cavity is formed in the upper end of the valve rod; the pressure relief cavity is provided with an opening, the opening is provided with the water replenishing port rubber mat in a covering manner, a pressure relief rubber mat and a pressure adjustment spring are arranged in the pressure relief cavity, a pressure relief port is formed in the middle partof the water replenishing port rubber mat, an overflow port capable of communicating with the pressure relief port is formed in the pressure relief cavity, and the pressure relief port communicates with the water supply and overflow channel; the pressure adjustment spring is arranged between the pressure relief rubber mat and the bottom of the pressure relief cavity, and the pressure relief rubber mat seals the pressure relief port under the elasticity effect of the pressure adjustment spring, so that the pressure relief port is spaced from the overflow port; and the valve rod is connected with the valve body housing, and is enabled to move up and down on the valve body housing, so that the water replenishing port rubber mat opens and closes the water replenishing channel. A water replenishing pipeline is used for water replenishing; however, the pressure relief port formed in the water replenishing port rubber mat has the function of pressure relief, so that the functions of water replenishing and pressure relief are realized on the same water valve simultaneously.

The invention discloses a fireproof door for preventing and controlling a mine fire. The fireproof door comprises a door body and a manhole penetrating through the door body, wherein two sliding doorsare arranged in the door body, and the sliding doors are parallel to the door body and are slidably connected to the bottom of the manhole; the tops of the two sides of the door body are jointly connected to an air flow adjusting device and a pressure relief device; the two sliding doors are respectively arranged on the two sides of the door body, each sliding door communicates with a flow adjusting chamber on the same side of the door body and hermetically communicates with an airflow channel, and the joint of each airflow channel and the corresponding flow adjusting chamber is located in aspace below a partition plate in the corresponding flow adjusting chamber. According to the fireproof door for preventing and controlling the mine fire, two airflow flowing effects are formed by the air flow adjusting device and the pressure relief device, and the flow rates of the air flow adjusting device and the pressure relief device are different, so that a stable airflow flowing trend is formed in a plane, smoke and heat flow impact the fireproof door, flows in a direction parallel to the fireproof door and then flows out to form an airflow circulating process, the smoke is fully in contact with an activated carbon layer to absorb harmful substances, the airflow is guided conveniently, and fire extinguishing is facilitated.

The invention belongs to the technical field of coil shaping of shell type electric reactors and relates to an intelligent control method and system for an oil press. According to the technical scheme, the system comprises an oil press pressing table (1), a touch screen (2), a control console (3), a PLC (4) and a pressure sensor (5). The touch screen is arranged on the control console, the PLC is arranged in the control console, the oil press pressing table is provided with the pressure sensor, the pressure sensor is connected with the PLC, and the PLC is connected with the touch screen and the control console. The intelligent control system for the oil press improves accuracy and safety of pressure control of the oil press, stage type pressurizing, pressure maintaining and decompressing functions can be achieved in the pressurizing process of the oil press, and the pressing and shaping process of a shell type transformer coil is optimized. The intelligent control system for the oil press has the advantages that pressure control errors are less, the control safety factor is high, the automatic pressurizing, pressure maintaining and decompressing functions can be achieved, various protection functions are complete, and the operation process is safe, convenient, fast and humanized.

The openable rear side window with the hidden pressure relief function. The openable rear side window comprises a side wall metal plate, an interior trim part, rear side window glass and a clamping sealing strip, wherein a rear side window hole is formed in the side wall metal plate, the rear side window glass covers the rear side window hole, and the rear side window glass is provided with the clamping sealing strip between the rear side window hole and the side wall metal plate and between the rear side window glass and the interior trim part; a pressure relief opening is formed in the area,close to the automobile door, of the rear side window lower side wall outer plate, and the rear side window glass covers the rear side window opening and the pressure relief opening at the same time;one end of the rear side window glass is hinged to the side wall metal plate, and the other end is connected with the side wall metal plate through a clamping lock; a pressure relief opening is formed in the front section of the side window hole, and due to the fact that rear side window glass covers the side window hole, observation cannot be achieved from the outer side of a cab, and the hiddenpressure relief function is achieved; the front section of the rear side window glass is connected with the side wall metal plate through a single hinge, the rear end of the rear side window glass isconnected through a clamping lock, and small-angle opening of the rear side window glass can be achieved.

The present invention relates to the field of mother and baby products, in particular to a breast pump. The single-air-pump dual-path breast pump comprises an air path steering valve; the air path steering valve comprises a negative pressure hole, a first milk bottle interface, a second milk bottle interface, a driving device and a valve element assembly; the first milk bottle interface communicates to the negative pressure hole by a first suction air path in the air path steering valve to form a first air path; the second milk bottle interface communicates to the negative pressure hole by a second suction air path in the air path steering valve to form a second air path; the first air path and the second air path are connected in parallel; and the driving device controls the valve elementassembly to act for enabling the air path steering valve to alternately open the first air path or the second air path. The air path steering valve is simultaneously connected with a pair of milk suction bottle assemblies and switches the air path, the single milk suction bottle assembly can be provided with negative pressure alternately under the motor control of the air path steering valve by adopting an air pump, the requirements on the power of the air pump are not extra added, and the comfort demand of alternate milk suction is further met.

The invention discloses a cover body structure and belongs to the field of water cups. The cover body structure comprises a cup cover, a pressure release valve and a button; the pressure release valve is fixed on the cup cover; the button is located at the top of the pressure release valve; one end of the button is hinged to the cup cover; the pressure release valve is provided with a pressure release rod which translates relative to the cup cover; a hydrogen absorption channel used for absorbing hydrogen is arranged in the middle of the pressure relief rod, and the button is connected to one end of the hydrogen absorption channel in a covering mode. The invention further discloses a hydrogen absorption water cup comprising the cover body structure. According to the cover body structure, alternation of multiple functions of hydrogen absorption, pressure relief and hydrogen-rich water drinking can be achieved through one cup cover, pressure-bearing hydrogen-rich water can be prepared, and the defect that in the prior art, a cup cover needs to be replaced is fundamentally overcome.

The invention discloses a lithium battery top cover explosion-proof structure and a lithium battery, the explosion-proof structure comprises a top cover, the top cover is provided with an explosion-proof hole, the lower side of the top cover is provided with an explosion-proof film used for sealing the explosion-proof hole, the explosion-proof film is an aluminum- plastic film, and the explosion-proof film is adhered to the lower side of the top cover through heat sealing. And the upper side of the top cover is provided with a protection structure for shielding and protecting the opening partof the explosion-proof hole. The explosion-proof film used for sealing the explosion-proof hole is arranged on the lower side of the top cover, the explosion-proof film is the aluminum-plastic film and is bonded to the lower side of the top cover through heat sealing, when the internal pressure of the battery is too large, heat sealing bonding fails after the explosion-proof film is stressed, andtherefore the pressure relief function is achieved; the upper side of the top cover is provided with the protection structure for shielding and protecting the opening part of the explosion-proof hole,the dust is prevented from getting into the explosion-proof hole, and a foreign object is prevented from piercing through the explosion-proof film; and the explosion-proof structure is simple in production process and low in cost, the overall cost of the lithium battery can be reduced, and the safety performance of the lithium battery can be improved.

The invention belongs to the field of butterfly valves, particularly relates to a steam pipeline butterfly valve with a pressure relief function, and aims to solve the problems that when an existing butterfly valve is used, due to the fact that air pressure in a pipeline is possibly increased, if pressure is not relieved in time, pipeline breakage, gas leakage and the like are easily caused, and a large amount of time needs to be consumed for maintenance; according to the technical scheme, the butterfly valve comprises a butterfly valve body, the two ends of the butterfly valve body fixedly communicate with connecting pipes, the top of the butterfly valve body is fixedly connected with a second rectangular box, and the inner wall of the second rectangular box is slidably connected with a sliding block. By arranging the first pressure relief assembly, the pressure relief function can be achieved when the air pressure in the pipeline is increased, when the air pressure is increased to exceed a threshold value, the device is protected through the second pressure relief assembly, the device is prevented from being damaged, meanwhile, the cost and time brought by maintenance are greatly saved, and the working efficiency is improved.