1882 results about "Butterfly valve" patented technology

The invention provides an eccentric butterfly valve performance detection method and system based on optical detection. The method comprises the steps that a first image of light transmission intensity distribution of a sealing pair structure of a bidirectional all-metal hard sealing four-eccentric butterfly valve is obtained; acquiring a reflection interference image of the structured light on the sealing pair structure according to the phase modulation structure grating light field, and performing conjoint analysis in combination with the first image to generate a contact pressure distribution matrix; based on the first image and the contact pressure distribution matrix, extracting corresponding multi-dimensional image features to generate a leakage early warning area map; space comparison is carried out on the leakage early warning area map and the floating response track of the sealing pair structure in the opening and closing process, and the corresponding floating response characteristics of the leakage early warning area in the opening and closing process are determined; and generating a butterfly valve sealing performance detection result according to the abnormal degree of the floating response characteristics. Through the implementation of the scheme, the leakage early warning area and the corresponding dynamic abnormal characteristics can be identified in advance, and the safety and the operation stability of the system are improved.

The invention relates to the technical field of pressure control, in particular to a butterfly valve pressure self-adaptive adjusting method, device and equipment and a storage medium. According to the method, a pre-constructed neural network model is introduced, and user set pressure, actual measurement pressure, current control signals and error parameters serve as input variables; dynamic generation and real-time self-adaptive adjustment of PID control parameters are realized, the technical bottlenecks that parameter setting of a traditional PID controller is complex and adaptability to non-linear and time-varying systems is insufficient are effectively solved, and the parameter adjustment period is shortened; the weight parameter of the neural network is continuously optimized through a back propagation algorithm, so that the inhibition capability of the system on external disturbance is remarkably enhanced, the overshoot is reduced, and the long-term stability and control precision of pressure control are improved; the target step number is calculated in combination with butterfly valve hardware parameters, the accuracy and rapidity of stepping motor driving are ensured, and the problem of response delay of traditional PID control is effectively solved.

The invention relates to the technical field of industrial wastewater sampling and discloses an industrial wastewater sampling system.The industrial wastewater sampling system comprises a frame, a connecting frame, a hydraulic cylinder and a rectangular plate, the connecting frame is located in the frame and slidably arranged in parallel, and the bottom of the hydraulic cylinder and the right side of the interior of the connecting frame are fixedly mounted; the upper surface of the rectangular plate and one end of an output shaft of a hydraulic cylinder are fixedly mounted, and a trigger sampling mechanism is arranged in the rectangular plate. According to the industrial wastewater sampling system, when a trigger rod is in contact with the bottom of a canal, a connecting spring and a telescopic rod in a power rebound mechanism are compressed, a third rack is driven to move upwards, a valve switch control mechanism is linked, a first butterfly valve and a second butterfly valve are synchronously closed, and a sampling barrel is sealed; it is ensured that the water sample is captured at the moment when the sampler is stabilized at the target depth and bottom mud is not stirred, and therefore index distortion of suspended solids and adsorptive heavy metal is effectively avoided, and the authenticity of the sample and the accuracy of detection data are improved.

The invention relates to a pressure control method and system and a storage medium. The method comprises the steps that the monitored current angle of a butterfly valve and the monitored current pressure of a process cavity are obtained; determining the current air inflow of the process chamber according to the current angle and the current pressure of the butterfly valve; determining the predicted pressure of the process chamber at the next moment according to the current angle of the butterfly valve and the current air inflow; according to the set target pressure, the predicted pressure at the next moment and the current air inflow, the target angle of the butterfly valve is determined; and the operation path of the butterfly valve reaching the target angle of the butterfly valve in the shortest time is planned, and the butterfly valve is controlled according to the operation path so that pressure control over the process cavity can be achieved. The real-time air inflow is automatically estimated, the future pressure is accurately predicted, pressure overshoot is reduced, and the stabilization time is shortened; and the opening switching speed of the butterfly valve is maximized, the target angle is reached as soon as possible within the hardware bearing range, and then the pressure response speed is increased.

Disclosed is a sediment-proof self-cleaning butterfly valve, comprising a butterfly valve body and a filtering apparatus. The filtering apparatus comprises a pressure adjustment chamber and a filtering chamber. The pressure adjustment chamber comprises a pressure adjustment pipe, a pressure adjustment assembly slidably connected to the pressure adjustment pipe, a rotating assembly connected to the pressure adjustment assembly, and an assistive support. The filtering chamber comprises an apparatus chamber and a second docking chamber perpendicular to the axis of the apparatus chamber. A filtering assembly and a cleaning assembly are provided in the apparatus chamber. A turbine apparatus is connected to the cleaning assembly, and the turbine apparatus drives the cleaning assembly to rotate. According to the present invention, it is possible to adapt to the pressure and flow of passing water, control the size of a water inlet of the first docking chamber, and ensure a sufficient pushing force of water when pushing the turbine apparatus to rotate. Thus, it is possible to automatically clean sediment from the filtering apparatus, ensure the filtering effect, and provide a more environment-friendly and energy-saving effect.

The utility model discloses a vertical top pressure butterfly valve pressure testing machine with good stability, which comprises a hydraulic push rod and a pressure testing cushion cylinder, the output end of the hydraulic push rod is connected with a pressure testing blind plate, the pressure testing cushion cylinder is arranged right below the pressure testing blind plate and is matched with the pressure testing blind plate, and the bottom of the pressure testing cushion cylinder is connected with a front support frame. Through replacement of the pressure test blind plate and the pressure test cushion cylinder, placement pressure test operation of the pressure test machine on butterfly valves with different calibers in the later period can be achieved, compared with traditional claw cylinder linkage pressure test, the pressure test device is simple in structural design, low in cost and suitable for application and popularization, finally, the pressure test cushion cylinder can be supported through the front supporting frame, and the pressure test efficiency is improved. The possibility of toppling during detection is prevented, and the later pressure test accuracy is improved.

The utility model discloses a mine paste filling powder batching device and method. The mine paste filling powder batching device comprises a silo, a silo top cover is arranged at the top of the silo, a dust remover and a safety valve are arranged on the silo top cover, a feeding port is formed in the upper portion of the silo and connected with a feeding pipe, and the bottom end of the silo is connected with an upper port of a silo cone. A lower port of the bin cone is connected with one end of a feeding pipe through a pneumatic butterfly valve A and a tubular flexible connector A, the other end of the feeding pipe is connected with a hopper top cover of a hopper barrel, the bottom end of the hopper barrel is connected with an upper port of a hopper cone, and a lower port of the hopper cone is connected with a feeding port of a spiral conveyor through a pneumatic butterfly valve B and a tubular flexible connector B; one end of the breathing pipe is connected with the side face of the feeding pipe, and the other end of the breathing pipe is connected with the hole opening of the hopper top cover; and a plurality of flow aiding devices are arranged on the cone wall of the bin cone and / or the cone wall of the hopper cone.

The invention discloses an intelligent early warning system for stainless steel cold rolling pipeline butterfly valves, and relates to the technical field of cold rolling production process monitoring, the system comprises a filtering tank, a plurality of oil outlet butterfly valves, a liquid level detection unit and a control module, the liquid level detection unit is arranged in the filtering tank and is used for collecting liquid level data of rolling oil in real time; the control module is used for calculating a speed curve of the liquid level changing along with time based on the liquid level data, comparing the liquid level descending speed with a preset speed threshold value so as to judge the operation state of the multiple oil outlet butterfly valves and outputting corresponding multi-stage early warning information; according to the invention, single-valve-level accurate detection can be realized, unfiltered rolling oil is prevented from entering the oil cleaning tank, the defect rate of spot marks on the surface of a steel coil is reduced, the qualification rate of cold-rolled products is improved, meanwhile, the manual inspection cost is reduced, and the system intelligence and maintenance convenience are improved; the technical problems of limited adaptive scene, accurate detection, information distortion, misjudgment risk and lack of an automatic early warning mechanism in the existing early warning technology are solved.

The invention discloses a closed-loop control method for a hydraulic control butterfly valve of a PCCP (prestressed concrete cylinder pipe) long-distance high-pressure water conveying pipeline, and belongs to the technical field of long-distance high-pressure water conveying pipeline control. The problems that in the prior art, due to manual scheduling or single-point PID control, a long-distance PCCP water conveying system has response lag and lacks global cooperation, the water attack risk is difficult to effectively deal with, and the optimal overall energy consumption of the system cannot be considered are solved. According to the invention, by constructing a hierarchical control architecture in which a distributed measurement and control network is coordinated with a central supervision control and data acquisition system platform, a variable-parameter PID control algorithm is built in an equipment PLC, so that millisecond-level identification and active suppression of a sudden water attack working condition are realized; a hydraulic simulation model and a multi-objective optimization algorithm are deployed in a central supervision control and data acquisition system master station, and a whole-line optimal pressure set value is solved through iterative calculation and is issued to each PLC for execution, so that the system energy consumption minimization is realized on the premise of ensuring the pipeline safety.

The utility model relates to the technical field of butterfly valves, in particular to a leakproof sealing type butterfly valve which comprises a valve body, a valve mechanism is installed in the valve body, a connecting shaft is fixed to the center of the inner side of the valve mechanism in a penetrating mode, and the connecting shaft is rotationally connected with the valve body. The valve mechanism comprises a valve plate, supporting rings are fixed to the two sides of the middle of the outer wall of the valve plate, anti-leakage sealing pieces are fixed to the outer portions of the supporting rings, wear-resisting contact mechanisms are welded to the edges of the two sides of the outer wall of the valve plate and attached to the anti-leakage sealing pieces, and rubber rings are fixed to the inner sides of the wear-resisting contact mechanisms. The abrasion-resistant contact mechanism comprises an abrasion-resistant ring, and the lower surface of the abrasion-resistant ring is connected with the valve plate in a welded mode. Particles on the inner wall of the valve body are effectively scraped away through the abrasion-resistant contact mechanism, and the leakage-proof sealing piece is prevented from being ground; the anti-leakage sealing piece enhances the fitting and anti-deformation capacities through a buffer structure; and the supporting ring anti-falling piece guarantees complete sealing, and the sealing and wear-resisting performance is comprehensively improved.

The invention provides an anti-corrosion butterfly valve of a self-repairing sealing structure, and relates to the technical field of butterfly valves, the anti-corrosion butterfly valve comprises two mounting flanges, and the two mounting flanges are both fixedly connected to the outer side of a butterfly valve body; the two groups of mounting bolt holes are respectively formed in the inner sides of the two mounting flanges; the mounting support is fixedly mounted on the upper end face of the butterfly valve body through bolts. The transmission box is fixedly mounted on the upper end face of the mounting support through bolts. The transmission connection cylinder is fixedly connected to the outer side of the transmission box; the valve rod transmission shaft center is rotationally connected to the inner side of the butterfly valve body, and the problems that in the using process of an existing anti-corrosion butterfly valve, if cracks are generated due to abrasion or scratching of a sealing ring, a gap is easily formed between a disc type valve clack of the butterfly valve and the sealing ring, normal work of the valve is affected, and the service life of the valve is shortened are solved. The sealing performance of the butterfly valve is guaranteed, and the service life is prolonged.

The present application relates to valve welding technical field, more specifically, it relates to a kind of adjustable assembled bidirectional butterfly valve welding device, including fixed welding frame, movable welding frame, centering shaft and welding machine, coaxial sleeve is provided with mounting sleeve I on centering shaft, and first inner hole centering mechanism is arranged on mounting sleeve I;Floating welding platform is slidably arranged on movable welding frame, and positioning sleeve is connected on floating welding platform, mounting sleeve II is rotatably arranged on positioning sleeve, second inner hole centering mechanism is arranged on mounting sleeve II, and centering shaft is inserted into positioning sleeve and limits the radial movement of positioning sleeve when movable welding frame moves along guide rail to the direction of centering shaft.This application, positioning sleeve, mounting sleeve I are positioned by the same centering shaft, so that positioning sleeve and mounting sleeve I can maintain high coaxiality, and mounting sleeve II is coaxially arranged on positioning sleeve, therefore, mounting sleeve II and mounting sleeve I also have high coaxiality, can guarantee the butt joint precision of flange and valve body.

The utility model relates to the technical field of exhaust and ventilation equipment, and discloses exhaust and ventilation equipment which is of a double-channel structure, a first exhaust pipe and a second exhaust pipe are arranged on the rear portion of an air suction guide pipe, and the first exhaust pipe and the second exhaust pipe are selectively communicated through a communication mechanism. The communicating cylinder base is driven by the driving motor to be rotationally installed in the sealing cylinder base, the air suction guide pipe can be independently communicated with the first exhaust pipe and the second exhaust pipe through rotation for channel switching, the structure is simple, work is reliable, discharged chlorine can be classified through channel switching according to the chlorine concentration change, and the chlorine treatment efficiency is improved. Unnecessary resource consumption is avoided, the chlorine treatment cost can be reduced while the working flexibility of the device is improved, the electric butterfly valve is arranged in the middle of the air suction guide pipe, the electric butterfly valve and the communicating mechanism are synchronously in a closed state after chlorine is exhausted, and the sealing protection performance in the working chamber can be effectively improved through double sealing.

The invention relates to the technical field of fabric testing, in particular to a testing device for fabric. According to the technical scheme, the ventilation detection device comprises a compressed air tank, a control valve and a mounting table, a plurality of telescopic air guide cylinders communicated with the compressed air tank are mounted on the mounting table, electric ventilation butterfly valves are arranged in the moving ends of the telescopic air guide cylinders, and a plurality of bearing cylinders corresponding to the telescopic air guide cylinders in position are mounted on a ventilation bearing table; the bearing cylinder is provided with an exhaust valve and a detection piece. Fabric is fixed to the two fixing rollers, the lifting table moves to push the two fixing rollers to be away from each other, a stretching test can be conducted on the face, meanwhile, the breathability detection device is made to be close to the breathability bearing table, and a stretchable gas guide cylinder and a bearing cylinder are in butt joint so that a breathability test can be conducted.

The invention relates to the technical field of butterfly valves, in particular to a pressure relief butterfly valve. The pressure relief butterfly valve comprises a valve body, a valve core and a pressure relief valve core, the butterfly plate is rotatably arranged in the medium channel, and a pressure relief through hole is formed in the butterfly plate; the valve rod is sleeved with the rotating block, the rotating block is tightly matched with the valve rod, the rotating block is located on one side of the butterfly plate, a sealing cover is arranged on the rotating block, in the sealing state, the sealing cover is tightly matched with the pressure relief through hole, in the pressure relief state, the sealing cover is separated from the pressure relief through hole, and the valve rod is used for driving the rotating block to move. The rotating block is switched from a sealing state to a pressure relief state; and the reset elastic component is used for providing elastic driving force for switching the rotating block from the pressure relief state to the sealing state. And in the pressure relief state, the sealing cover is separated from the pressure relief through hole, and a medium can flow through the pressure relief through hole, so that the torque required when the valve is opened is reduced, the problems of vibration and abrasion of the valve are solved, and the reliability and the safety of the valve are improved.

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

An extraction cleaner includes a suction nozzle having an inlet path and suction fan configured to provide suction. The inlet path brings liquid and air into the extraction cleaner. Suction fan has a fan entrance, a recovery tank is spaced from the fan entrance. A separator element configured to allow liquid to flow into the recovery tank, inhibit the flow of liquid out of the recovery tank, and inhibit liquid from reaching the fan entrance, or all three. The separator element may be a butterfly valve configured to selectively close the fan entrance. The separator element may be a funnel extending into the recovery tank to block liquid from leaving the recovery tank during inversion. The separator element may be a fan separator adjacent the suction fan, which directs liquid outward, away from the fan separator, within the extraction cleaner, such that liquid is moved away from the suction fan.

The utility model relates to the technical field of electric butterfly valves, and discloses a double-seal flange type electric butterfly valve which comprises a valve port, a connecting shell is fixedly connected to the outer wall of the upper end of the valve port, a control valve is fixedly connected to the outer wall of the upper end of the connecting shell, a rotating rod is fixedly connected to the inner wall of the valve port, and the rotating rod is fixedly connected to the outer wall of the upper end of the connecting shell. The outer wall of the rotating rod is sleeved with a sleeve shell, the outer wall of the sleeve shell is fixedly connected with a valve plate, and a sealing assembly is arranged in the valve port. According to the double-sealing flange type electric butterfly valve, a transmission rod is driven by a motor to rotate, the transmission rod rotates, a sleeve shell drives a valve plate to rotate, at the moment, a transmission bevel gear moves on a driving bevel gear to make the transmission bevel gear rotate, and therefore the transmission bevel gear drives a rotating disc to rotate; at the moment, the protruding block is driven by the rotating disc to rotate to make contact with the push plate and can make the push plate move, so that the clamping plate extends out to further seal the valve port, and the sealing effect of double sealing of the butterfly valve is better.

The invention discloses a real-time leakage monitoring system for a high-pressure-resistant plastic butterfly valve. The real-time leakage monitoring system comprises an acquisition module, a physical analysis module, a fusion module and an early warning module, wherein the physical analysis module is used for carrying out a leakage test on the high-pressure-resistant plastic butterfly valve through physical and mechanical analysis; and the fusion module is used for performing deviation calculation on the static health benchmark, the dynamic health benchmark, the strain health benchmark, the quiet benchmark and the health torque benchmark, and obtaining specific performance characteristics in each leakage state through a linear equation set and double-cosine finite integral transformation. Aiming at the material characteristics of the high-pressure-resistant plastic butterfly valve, a multi-dimensional and refined health reference system is constructed; an advanced mathematical model based on multi-sensor data fusion, a linear equation set and double-cosine finite integral transformation is introduced, and accurate recognition, quantification and physical characteristic representation of the leakage state are achieved; and the sealing performance can be evaluated under a non-fluid working condition, so that a comprehensive and intelligent real-time leakage monitoring scheme is provided.

The application provides a kind of eccentric butterfly valve performance detection method and system based on optical detection, the method comprises: obtaining the first image of the light transmission intensity distribution of the sealing pair structure of bidirectional full-metal hard sealing four eccentric butterfly valve;According to the reflection interference image of structured light on the sealing pair structure collected by phase modulation structure grating light field, and combined with the first image, joint analysis is carried out to generate contact pressure distribution matrix;Based on the first image and contact pressure distribution matrix, the corresponding multi-dimensional image features are extracted to generate leakage early warning area atlas;The floating response trajectory of the sealing pair structure in the opening and closing process is compared with the leakage early warning area atlas in space, and the corresponding floating response characteristics of the leakage early warning area in the opening and closing process are determined;According to the abnormal degree of floating response characteristics, the butterfly valve sealing performance detection result is generated. Through the implementation of the application scheme, the leakage early warning area and its corresponding dynamic abnormal characteristics can be identified in advance, and the safety and operation stability of the system are improved.

The invention belongs to the technical field of pharmaceutical preparation equipment, and particularly discloses a mixing and blending device for preparing an anti-tumor medicament. The bottom of the cylindrical tank body is funnel-shaped and is connected with an outlet of a butterfly valve; a top cover is arranged at the top of the tank body and is provided with a main shaft driven by a servo motor, the upper section of the main shaft is provided with a double-end spiral stirring blade, the screw pitch is gradually reduced from top to bottom, and the lower section is fixed with a shearing stirring blade which is provided with a through hole. A plurality of layers of inclined guide plates are arranged on the inner wall of the tank body to form a layered stirring frame which forms a reverse shear flow field with the spiral blades. An interlayer cavity in the side wall of the tank body is connected with a circulating guide pipe to achieve cooling temperature control, a dynamic sealing ring between the main shaft and the top cover conducts self-adaptive sealing, and the top cover is provided with an inert gas connector and a gas outlet. The supporting base is connected with the fixing ring base through the damping spring. Through the synergistic effect of layered reverse shearing, dynamic sealing and a cooling system, the chemical mixing uniformity is remarkably improved, the oxidation and leakage risks are reduced, and meanwhile vibration and operation complexity are reduced.

The utility model discloses an anti-blocking powder material valve, which relates to the technical field of valves, and comprises a butterfly valve main body, the upper end of the butterfly valve main body is fixedly provided with a material guiding assembly, the material guiding assembly is provided with a driving assembly, the material guiding assembly is rotatably provided with a rotating assembly simultaneously, and the rotating assembly is connected with the driving assembly simultaneously. The rotating assembly is composed of a rotating shaft, a transmission bevel gear and two limiting check blocks, the transmission bevel gear is fixedly installed at the outer end of the rotating shaft, the rotating shaft is fixedly sleeved with the two limiting check blocks, the rotating shaft is fixedly sleeved with the rotating dredging assembly, and the rotating dredging assembly is located in the material guiding pipe at the same time. The driving assembly and the rotating assembly are arranged on the material guiding assembly, the rotating dredging assembly is arranged on the rotating assembly, powder can be helped to smoothly pass through the butterfly valve body, and therefore the probability that the butterfly valve body is blocked by the powder is reduced, the flowing efficiency of the powder can be guaranteed, labor can be saved, and manpower waste is reduced.

The invention discloses a PID (Proportion Integration Differentiation) control method and device for flow control of a low-pressure steam inlet butterfly valve of a steam turbine. The method comprises the following steps: acquiring steam monitoring data in a steam pipeline of the steam turbine and load parameters of the steam turbine; based on a steam turbine load determination model, the load mode of the steam turbine and the adjusting quantity of a low-pressure steam inlet butterfly valve are respectively determined by combining the steam monitoring data and the steam turbine load parameters; based on the adjusting quantity of the low-pressure steam inlet butterfly valve, an adjusting instruction of the low-pressure steam inlet butterfly valve is generated; and after the adjustment instruction is executed, the flow deviation between the steam flow value of the low-pressure steam inlet butterfly valve and the expected flow value is calculated based on a PID control algorithm, and if the flow deviation exceeds a preset threshold value, the opening degree of the low-pressure steam inlet butterfly valve is subjected to compensatory adjustment based on the flow deviation. The load mode and the butterfly valve adjusting quantity are determined in real time by combining the steam turbine load parameters, the coupling problem between the valve and the unit load is effectively solved, and accurate control over the flow of the low-pressure steam inlet butterfly valve is achieved.

The invention discloses an RTO heat accumulating type incinerator, which relates to the technical field of waste gas treatment and comprises an incinerator body, an air duct, three heat accumulators and a combustion device, a heat preservation layer is arranged on the inner side of the furnace body, and a combustion chamber, three heat storage chambers and three gas collection chambers are arranged in the furnace body. An explosion venting opening is formed in the top of the furnace body; the corresponding heat storage chambers are filled with the heat storage bodies, and the furnace body is provided with a filtering device. The combustion device is arranged on one side of the furnace body; the air duct comprises a waste gas pipeline; the waste gas pipeline comprises a gas inlet pipe, a gas outlet pipe and three ventilation pipes; the top of the breather pipe is communicated with the bottom of the gas collection chamber; the two ends of the breather pipe are connected and communicated with the air inlet pipe and the air outlet pipe respectively, and butterfly valves are arranged at the two ends of the breather pipe. The use cost and the maintenance difficulty can be effectively reduced while the waste gas treatment efficiency and the effect stability are guaranteed.

An annular groove is formed in a valve body, a piston ring and a valve seat ring are arranged in the annular groove, a movable valve seat is arranged at the front end of the valve seat ring, the movable valve seat is matched with a butterfly plate in a conical surface hard sealing mode, and a drainage hole is formed in the bottom of the annular groove. A reverse medium enters the annular groove through the drainage hole to push the piston ring, the piston ring pushes the valve seat ring, and the valve seat ring pushes the movable valve seat, so that the movable valve seat is wedged on the sealing surface of the butterfly plate; when a medium flows in the forward direction, the downstream is a low-pressure area, the piston ring is pushed to the bottom of the annular groove, the valve seat ring and the movable valve seat are pushed by the medium to be tightly attached to the sealing face of the butterfly plate, the larger the medium pressure is, the larger the sealing force is, and the medium pressure self-sealing effect is achieved; the movable valve seat is pushed by a medium to be tightly attached to the sealing face of the butterfly plate for compensation, and therefore the whole sealing pair can keep the sealing performance of a new valve after being opened and closed at high frequency.

The utility model relates to the technical field of fluid control, in particular to a valve seat and an electronic expansion valve. A first opening, a second opening and a first mounting opening are formed in the valve seat, the first mounting opening is inclined relative to the first opening and the second opening, and the included angle between the first mounting opening and the first opening is smaller than that between the first mounting opening and the second opening. A first protrusion protruding towards the first installation opening is arranged on the inner wall of the valve seat, a valve hole is formed between the first protrusion and the second opening, one end of the valve hole is communicated with the second opening, and a valve port is formed in the other end of the valve hole. A conical section is arranged on the inner wall of the valve seat and located at the end, connected with the valve hole, of the second opening, the inner diameter of the conical section is gradually reduced in the direction away from the second opening, and the valve hole is connected with the conical section. The butterfly valve has the advantages that the heights of the valve seat and the valve port can be reduced, the flow loss of a medium can be reduced, the flow is increased, and the overall height of the valve can be reduced.

The invention belongs to the technical field of filtration, and particularly relates to a double-backwash filtration system and method. The system comprises a water inlet pipe, a first branch water pipe, a second branch water pipe, an emergency water pipe, a pressurizing water pipe, a water outlet pipe, a water inlet ball valve, a pressurizing water ball valve, a branch water inlet butterfly valve, a backwashing filter, a branch water outlet butterfly valve and an emergency water butterfly valve. And non-stop maintenance is realized, the continuity and stability of system operation are remarkably improved, and production interruption caused by blockage of a single path is avoided. An emergency water pipe and a pressurizing water pipe are arranged, so that water source supplementation or switching to an emergency passage can be realized in time when water pressure of a main passage is insufficient or a filter is blocked, continuous water supply of external equipment is ensured, and the casting blank quality is effectively prevented from being influenced by water quality or water pressure problems.

The invention relates to the technical field of pressure control, and discloses a pressure control method, system and equipment for a vacuum butterfly valve and a storage medium, and the method comprises the steps: obtaining a pressure control error signal and an error change rate according to the internal pressure of a cavity and a preset target pressure; determining a calculation result of the composite controller based on the pressure control error signal and the error change rate; inputting a calculation result of the composite controller into a smooth switching function, calculating a mixed output quantity, and searching an optimal smooth factor and an error switching threshold value of the smooth switching function in a current environment through a particle swarm optimization algorithm; performing nonlinear compensation on the mixed output quantity of the composite controller by adopting a compensation function, converting the control quantity subjected to nonlinear compensation into the rotation step number of a stepping motor through motor driving, and controlling the rotation angle of the butterfly valve by adopting the stepping motor; the control precision and the dynamic performance are improved.

The invention provides a compact side-mounted butterfly valve. The compact side-mounted butterfly valve comprises a valve body, an execution mechanism and a protection mechanism. The box body is fixed outside the valve body, the executing mechanism is integrated in the box body, and the overall structural layout is optimized by combining the sliding design that the hand wheel is laterally installed and the first rack is parallel to the axis of the valve body, so that the butterfly valve has the advantage of being compact in structure, and is particularly suitable for installation scenes such as a wall where the rotation space of the hand wheel is limited. Sufficient operation space is provided for operators, rotation of the hand wheel and opening and closing operation of the valve plate are more convenient and labor-saving, and adaptability and operation practicability of the butterfly valve in a narrow installation environment are effectively improved. And after the valve plate rotates to the open state, the two baffles of the protection mechanism rotate to the side, facing the water inlet end of the valve cavity, of the sealing ring, so that the sealing ring facing the water inlet end is effectively shielded when the valve cavity is opened, impurities in fluid are prevented from directly impacting and abrading the sealing ring, and the protection effect on the sealing ring is achieved.

The invention discloses a locking butterfly valve, which belongs to the technical field of valves, and comprises a valve seat, a liquid inlet pipe is arranged on the side wall of the valve seat, the liquid inlet pipe is communicated with the valve seat, a liquid outlet is formed in the bottom end of the valve seat, a sealing plug for blocking the liquid outlet is arranged in the valve seat, a valve core is clamped on the sealing plug, a lifting handle is arranged on the peripheral surface of the valve core, and the lifting handle is connected with the valve seat. A rotating ring is rotationally installed at the top end of the valve seat, a limiting part is fixed to the bottom face of the rotating ring, the bottom face of the limiting part abuts against the top face of the lifting handle, and a fixing piece used for fixing the lifting handle is arranged on the valve seat. The lifting handle has the effect of reducing aching pain of fingers of a user when the user lifts the lifting handle for a long time.