A slurry valve and its control method

Abstract

The present invention discloses a slurry valve and its control method. The slurry valve includes a valve body, a valve plate and a pressure regulating device; the valve plate is also connected with an actuator located outside the plate bin, and driving the actuator can make the valve plate enter the connection part of the feed pipe section and the discharge pipe section from the plate bin for blocking the feed; the pressure regulating device includes a first expansion airbag, a pressure regulating airbag and a flexible air pipe connecting the first expansion airbag and the pressure regulating airbag; a first sealing plate is arranged on one side of the valve plate close to the feed pipe section, and the first expansion airbag is arranged between the first sealing plate and the valve plate; the pressure regulating airbag is arranged in the feed pipe section; after the slurry valve is closed, the slurry flows back and is pressurized in the feed pipe section, the gas in the pressure regulating airbag is compressed and enters the first expansion airbag through the flexible air pipe, and the volume of the first expansion airbag expands to abut against the feed pipe section through the first sealing plate. The technical solution of the present invention aims to improve the sealing performance of the slurry valve under high pressure difference conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and particularly to a slurry valve and a control method thereof. Background Art

[0002] In industrial processes, the flow and control of various slurries such as mud, pulp, ceramic slurry, and chemical slurry are of crucial significance to production efficiency and product quality. These slurries generally have the characteristics of high viscosity and high solid content. Therefore, in many application scenarios, the slurry valve needs to operate under high pressure difference conditions. However, this requires the slurry valve to be able to withstand a large pressure difference while maintaining stable sealing performance, so as to prevent leakage and ensure precise control of the fluid. However, the current slurry valves often have difficulty meeting the requirements of stability and sealing performance under high pressure difference operating conditions in terms of design. Specifically, problems such as deformation and damage are prone to occur in the valve plate, actuator, and seal under high pressure difference conditions, which are likely to cause leakage and unstable performance of the slurry valve. Summary of the Invention

[0003] The purpose of the present invention is to provide a slurry valve and a control method thereof, aiming to solve the technical problems of easy leakage and unstable performance of valves in a high pressure difference environment.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] A slurry valve includes a valve body, a valve plate, and a pressure regulating device;

[0006] The valve body has a coaxially arranged feed pipe section and a discharge pipe section, and a plate bin formed between the feed pipe section and the discharge pipe section, and the plate bin is used for accommodating the valve plate;

[0007] The valve plate is further connected to an actuator located outside the plate bin, and driving the actuator can make the valve plate enter the connection of the feed pipe section and the discharge pipe section from the plate bin to block the feed;

[0008] The pressure regulating device includes a first expansion airbag, a pressure regulating airbag, and a flexible air pipe connecting the first expansion airbag and the pressure regulating airbag;

[0009] A first sealing plate is arranged on one side of the valve plate close to the feed pipe section, and the first expansion airbag is arranged between the first sealing plate and the valve plate; the pressure regulating airbag is arranged in the feed pipe section;

[0010] After the slurry valve is closed, the slurry undergoes reflux and pressure increase in the feed pipe section, the gas in the pressure regulating airbag is compressed, and enters the first expansion airbag through the flexible air pipe, and the volume of the first expansion airbag expands to abut against the feed pipe section through the first sealing plate.

[0011] In one embodiment, a sealing ring is embedded in the first sealing plate. The sealing ring abuts against the feed pipe section, and the height of the sealing ring is flush with that of the first sealing plate.

[0012] In one embodiment, a spring is further arranged between the first sealing plate and the valve plate. The spring is fixedly connected to the first sealing plate and the valve plate respectively.

[0013] In one embodiment, the feed pipe section further forms a receiving space for receiving the pressure regulating air bag; a housing is arranged on one side of the pressure regulating air bag close to the feed channel;

[0014] When the slurry valve is opened, the pressure regulating air bag is received in the receiving space, and the slurry contacts the housing.

[0015] When the slurry valve is closed, the slurry flows back. Due to the water hammer effect, the pressure regulating air bag disengages from the receiving space, so that the slurry directly contacts the pressure regulating air bag.

[0016] In one embodiment, the feed pipe section is further provided with a limiting member, and the limiting member cooperates with the housing.

[0017] In one embodiment, a plurality of flow disturbing plates are further arranged on one side of the housing close to the feed channel. The flow disturbing plates are inclined towards the valve plate.

[0018] In one embodiment, the pressure regulating device further includes an air inflation pump and an exhaust device. The air inflation pump and the exhaust device are arranged outside the valve body and are respectively communicated with the flexible air pipe.

[0019] The present invention also provides a control method for a slurry valve, which is applied to any one of the above slurry valves. The actuator includes a motor actuator. The slurry valve further includes a PLC controller, a position sensor and a pressure sensor. The position sensor is used to monitor the position of the valve plate in real time, and the pressure sensor is used to monitor the pressure in the feed pipe section in real time; an electromagnetic valve is further arranged between the first expansion air bag and the pressure regulating air bag;

[0020] The method includes:

[0021] S1. Start the power supply. The PLC controller performs self-checking, and the self-checking includes checking the power-on states of the motor actuator, the sensors, the electromagnetic valve, the air inflation pump and the status monitoring system; after confirming that all devices are working properly, the slurry valve enters the standby working state;

[0022] S2. The PLC controller receives a flow demand signal, and determines the slurry flow rate and the valve plate position demand according to the flow demand signal.

[0023] S3. The PLC controller issues an instruction, and the motor actuator adjusts the opening degree of the valve plate according to the flow demand;

[0024] S4. The position sensor real-time feeds back the position of the valve plate to ensure that the valve plate reaches the target opening degree;

[0025] S5. The pressure sensor is used to monitor the pressure change in the feed pipe section in real time. If the detected pressure is too high, the gas in the pressure regulating air bag is discharged through the exhaust device; if the detected pressure is too low, the pressure regulating air bag is inflated by the air inflating pump to increase the pressure;

[0026] S6. After the slurry valve is closed, a water hammer effect occurs in the feed pipe section. Under the action of the water hammer effect, the pressure regulating air bag actively contracts to inhibit the water hammer effect and reduce the damage to the valve plate caused by the water hammer effect;

[0027] When the pressure regulating air bag actively contracts, the solenoid valve is opened. The contraction of the pressure regulating air bag can transport the gas to the first expansion air bag through the flexible air pipe, so that the first sealing plate is in sealing contact with the feed pipe section.

[0028] Further, the method includes:

[0029] After the slurry valve is closed, the electromagnet is powered off to release the outer housing.

[0030] Further, the slurry valve further includes an alarm device and a status monitoring system; the method includes:

[0031] The status monitoring system performs fault detection on the pressure sensor and the position sensor. When the pressure sensor or the position sensor fails or is abnormal, the status monitoring system sends a signal to the alarm device, and the alarm device triggers an audible and visual alarm signal.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The technical solution of the present invention realizes the improvement of the sealing performance of the slurry valve under the condition of high pressure difference by designing the valve body, the valve plate and the pressure regulating device. Specifically, a pressure regulating air bag is arranged in the feed pipe section, a first expansion air bag and a first sealing plate are arranged on the valve plate; the first expansion air bag and the pressure regulating air bag are connected through a flexible air pipe. After the slurry valve is closed, the slurry flows back and increases the pressure in the feed pipe section. The gas in the pressure regulating air bag is compressed and enters the first expansion air bag through the flexible air pipe. The volume of the first expansion air bag expands, so that the first sealing plate abuts against the feed pipe section, thereby enhancing the sealing performance of the slurry valve.

[0034] It can also be understood that the gas in the pressure-regulating airbag is compressed, and the volume of the pressure-regulating airbag shrinks, which helps to reduce the air pressure in the feed pipe section, thereby reducing the influence of the high pressure difference on the sealing performance of the slurry valve and improving the stability of the performance of the slurry valve. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] The structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present invention can be implemented. Therefore, they do not have technical substance significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0037] Figure 1 It is a schematic structural diagram of an embodiment of the discharging valve of the present invention;

[0038] Figure 2 It is Figure 1 the enlarged view of part A in

[0039] Figure 3 It is Figure 1 the schematic diagram of the change state in

[0040] Figure 4 It is Figure 3 the enlarged view of part B in

[0041] Figure 5 It is the schematic diagram of the principle of the discharging valve control method of the present invention;

[0042] Illustration: 100, slurry valve; 110, valve body; 112, feed pipe section; 112a, accommodation space; 112b, feed channel; 1121, limiting member; 113, discharge pipe section; 114, plate bin;

[0043] 120, valve plate; 121, first sealing plate; 122, sealing ring; 123, spring; 131, first expansion airbag; 132, pressure-regulating airbag; 133, flexible air pipe; 134, outer housing; 135, spoiler; 136, air pump; 137, exhaust device; 138, solenoid valve;

[0044] 140. Actuator; 150. PLC controller; 170. Pressure sensor; 180. Alarm device; 190. Status monitoring system. Detailed implementation manners

[0045] To make the technical objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be intermediate components present.

[0047] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and through specific implementation manners.

[0048] Embodiment 1:

[0049] The embodiment of the present invention provides a slurry valve 100.

[0050] Please refer to Figures 1 to 5 , the slurry valve 100 includes a valve body 110, a valve plate 120, and a pressure regulating device;

[0051] The valve body 110 has a coaxially arranged feed pipe section 112 and a discharge pipe section 113, and a plate bin 114 formed between the feed pipe section 112 and the discharge pipe section 113, and the plate bin 114 is used to accommodate the valve plate 120;

[0052] The valve plate 120 is further connected to an actuator 140 located outside the plate bin 114. Driving the actuator 140 can make the valve plate 120 enter the connection between the feed pipe section 112 and the discharge pipe section 113 from the plate bin 114 to block the feed;

[0053] The pressure regulating device includes a first expansion airbag 131, a pressure regulating airbag 132, and a flexible air pipe 133 connecting the first expansion airbag 131 and the pressure regulating airbag 132;

[0054] A first sealing plate 121 is arranged on one side of the valve plate 120 close to the feed pipe section 112, and the first expansion airbag 131 is arranged between the first sealing plate 121 and the valve plate 120; the pressure regulating airbag 132 is arranged in the feed pipe section 112;

[0055] After the slurry valve 100 is closed, the slurry flows back and is pressurized in the feed pipe section 112. The gas in the pressure regulating airbag 132 is compressed and enters the first expansion airbag 131 through the flexible air pipe 133. The volume of the first expansion airbag 131 expands to abut against the feed pipe section 112 through the first sealing plate 121.

[0056] It can be understood that the technical solution of the present invention realizes the improvement of the sealing performance of the slurry valve 100 under the condition of high pressure difference by designing the valve body 110, the valve plate 120 and the pressure regulating device. Specifically, by arranging the pressure regulating airbag 132 in the feed pipe section 112, arranging the first expansion airbag 131 and the first sealing plate 121 on the valve plate 120; using the flexible air pipe 133 to connect the first expansion airbag 131 and the pressure regulating airbag 132.

[0057] After the slurry valve 100 is closed, as Figure 1 shown, the slurry flows back and is pressurized in the feed pipe section 112. The gas in the pressure regulating airbag 132 is compressed and enters the first expansion airbag 131 through the flexible air pipe 133. The volume of the first expansion airbag 131 expands to abut against the feed pipe section 112 through the first sealing plate 121, so as to enhance the sealing performance of the slurry valve 100.

[0058] It can also be understood that the gas in the pressure regulating airbag 132 is compressed, and the volume of the pressure regulating airbag 132 shrinks, which helps to reduce the air pressure in the feed pipe section 112, thereby reducing the influence of the high pressure difference on the sealing performance of the slurry valve 100 and improving the performance stability of the slurry valve 100.

[0059] Specifically, a sealing ring 122 is embedded in the first sealing plate 121. The sealing ring 122 abuts against the feed pipe section 112, and the height of the sealing ring 122 is flush with that of the first sealing plate 121.

[0060] It can be understood that the setting of the sealing ring 122 realizes close contact with the feed pipe section 112 to prevent leakage. And the sealing ring 122 can better adapt to the change of pressure difference, so that the valve plate 120 maintains a sealed state under high pressure difference. Further, the height of the sealing ring 122 is flush with that of the first sealing plate 121, and the sealing ring 122 is usually made of an elastic material, and its setting can reduce the friction between the valve plate 120 and the pipe section. Further, the separate setting of the sealing ring 122 is conducive to replacement and maintenance, thereby ensuring the stable operation of the system.

[0061] Further, a spring 123 is also arranged between the first sealing plate 121 and the valve plate 120, and the spring 123 is fixedly connected to the first sealing plate 121 and the valve plate 120 respectively.

[0062] It can be understood that the spring 123 can provide continuous pressure to maintain close contact between the first sealing plate 121 and the feed pipe section 112 to prevent leakage; and the elasticity of the spring 123 can compensate for small movements or errors, thereby ensuring the sealing effect.

[0063] Further, a receiving space 112a for receiving the pressure regulating airbag 132 is formed in the feed pipe section 112; a housing 134 is arranged on one side of the pressure regulating airbag 132 close to the feed channel 112b;

[0064] When the slurry valve 100 is opened, the pressure regulating airbag 132 is received in the receiving space 112a, and the slurry contacts the housing 134;

[0065] When the slurry valve 100 is closed, the slurry flows back, and due to the water hammer effect, the pressure regulating airbag 132 disengages from the receiving space 112a, so that the slurry directly contacts the pressure regulating airbag 132.

[0066] Specifically, when the slurry valve 100 is opened, due to the impact force of the slurry, the pressure regulating airbag 132 can be received in the receiving space 112a. At this time, the slurry contacts the housing 134, protecting the pressure regulating airbag 132 from direct contact wear and impact.

[0067] When the slurry valve 100 is closed, due to the water hammer effect (pressure wave caused by the sudden stop or change of direction of the fluid), the slurry flows back. At this time, the pressure regulating airbag 132 drives the housing 134 to disengage from the receiving space 112a, so that the slurry directly contacts the pressure regulating airbag 132 in the uncovered area of the housing 134. This contact enables the pressure regulating airbag 132 to sense the pressure change and compress the internal gas, and the gas transmits the gas to the first expansion airbag 131 through the flexible air pipe 133, thereby enhancing the sealing effect.

[0068] It can be understood that in the valve open state, the outer housing 134 protects the pressure regulating airbag 132 from the abrasion and impact of direct contact with the slurry, extending the life of the airbag. In the valve closed state, the outer housing 134 can smoothly disengage the pressure regulating airbag 132 from the receiving space 112a with the assistance of gravity. At this time, the pressure regulating airbag 132 is in direct contact with the slurry, responding in a timely manner to the backflow and pressure changes to ensure the sealing effect through the first expansion airbag 131.

[0069] And the above settings utilize the water hammer effect to ensure timely response and sealing during slurry backflow, enhancing the stability and reliability of the slurry valve 100.

[0070] Furthermore, as Figure 3 shown, the feed pipe section 112 is further provided with a limiting member 1121, and the limiting member 1121 cooperates with the outer housing 134. It can be understood that the limiting member 1121 can control the position and receiving range of the outer housing 134. The limiting member 1121 cooperates with the outer housing 134, and the outer housing 134 can be positioned within a specific range under the constraint of the limiting member 1121.

[0071] When the slurry valve 100 is opened, the outer housing 134 protects the pressure regulating airbag 132 to ensure that the pressure regulating airbag 132 is received within the receiving space 112a to reduce the extrusion of the slurry, so that the gas in the pressure regulating airbag 132 is fully and effectively released.

[0072] Furthermore, a plurality of spoiler plates 135 are provided on the side of the outer housing 134 close to the feed channel 112b, and the spoiler plates 135 are inclined towards the valve plate 120.

[0073] It can be understood that by providing a plurality of inclined spoiler plates 135 on the outer housing 134, the direct impact and wear on the valve plate 120 are reduced by guiding and dispersing the slurry flow.

[0074] After the slurry valve 100 is closed, the backflow of the slurry can act on the side of the spoiler plate 135 close to the outer housing, thereby driving the outer housing 134 to move, enabling the pressure regulating airbag 132 to smoothly disengage from the receiving space 112a.

[0075] Furthermore, the pressure regulating device further includes an air inflation pump 136 and an exhaust device 137. The air inflation pump 136 and the exhaust device 137 are disposed outside the valve body 110 and are respectively connected to the flexible air pipe 133.

[0076] It can be understood that the air inflation pump 136 and the exhaust device 137 are respectively connected to the flexible air pipe 133 for adjusting the air pressure in the pressure regulating airbag 132.

[0077] The pressure regulating airbag 132 or the first expansion airbag 131 is inflated by an air inflation pump 136 to increase the internal pressure, which is used to quickly increase the pressure of the airbag when needed and enhance the sealing effect.

[0078] The exhaust device 137 is used to release the gas in the pressure regulating airbag 132 or the first expansion airbag 131 to reduce the internal pressure.

[0079] Optionally, the exhaust device 137 can be an electric exhaust valve, a pneumatic exhaust valve or a proportional valve, etc.

[0080] Optionally, a solenoid valve 138 is further provided between the first expansion airbag 131 and the pressure regulating airbag 132.

[0081] Embodiment 2:

[0082] A control method for a slurry valve 100, using the slurry valve 100 as described above. The actuator 140 includes a motor actuator. The slurry valve 100 further includes a PLC controller 150, a position sensor and a pressure sensor 170. The position sensor is used to monitor the position of the valve plate 120 in real time, and the pressure sensor 170 is used to monitor the pressure in the feed pipe section 112 in real time; a solenoid valve 138 is further provided between the first expansion airbag 131 and the pressure regulating airbag 132;

[0083] The method includes:

[0084] S1. Start the power supply, and the PLC controller 150 performs self-checking. The self-checking includes checking the power-on states of the motor actuator, sensors, solenoid valve 138, air inflation pump 136 and the status monitoring system 190; after confirming that all devices are working properly, the slurry valve 100 enters the standby working state;

[0085] S2. The PLC controller 150 receives a flow demand signal, and determines the slurry flow rate and the position demand of the valve plate 120 according to the flow demand signal;

[0086] S3. The PLC controller 150 issues an instruction, and the motor actuator adjusts the opening degree of the valve plate 120 according to the flow demand;

[0087] S4. The position sensor real-time feeds back the position of the valve plate 120 to ensure that the valve plate 120 reaches the target opening degree;

[0088] S5. The pressure sensor 170 is used to monitor the pressure change in the feed pipe section 112 in real time. If the detected pressure is too high, the gas in the pressure regulating airbag 132 is discharged through the exhaust device 137; if the detected pressure is too low, the pressure regulating airbag 132 is inflated by the air inflation pump 136 for pressure boosting;

[0089] S6. After the slurry valve 100 is closed, a water hammer effect occurs in the feed pipe section 112. Under the action of the water hammer effect, the pressure regulating airbag 132 actively contracts to inhibit the water hammer effect and reduce the damage to the valve plate 120 caused by the water hammer effect.

[0090] When the pressure regulating airbag 132 actively contracts, the solenoid valve 138 is opened. The contraction of the pressure regulating airbag 132 can transport gas to the first expansion airbag 131 through the flexible air pipe 133, so that the first sealing plate 121 is in sealed contact with the feed pipe section 112.

[0091] It can be understood that the above method utilizes the linkage between the pressure regulating airbag 132 and the first expansion airbag 131, controls the gas flow through the solenoid valve 138, enables the first expansion airbag 131 to push the sealing plate to be in close contact with the feed pipe section 112, greatly improves the sealing performance of the slurry valve 100 under high pressure difference conditions, and effectively reduces the leakage risk.

[0092] Through the PLC controller 150 combined with the position sensor and the pressure sensor 170, the real-time monitoring and adjustment of the position and pressure of the valve plate 120 are realized, ensuring the precise operation and efficient operation of the valve. The degree of automation is high, reducing human intervention and the risk of operation errors.

[0093] The pressure regulating airbag 132 actively contracts under the water hammer effect, absorbs excessive pressure fluctuations, avoids the impact and damage of the water hammer on the valve plate 120 and related components, and significantly extends the service life of the equipment.

[0094] The PLC controller 150 dynamically adjusts the opening of the valve plate 120 and the airbag pressure according to the externally input flow demand signal, flexibly adapts to different working conditions, and improves the adaptability and reliability of the system.

[0095] By actively controlling the pressure regulating airbag 132 and the water hammer suppression mechanism, the valve plate 120, the pressure regulating airbag 132 and other key components are effectively protected, the wear and impact are reduced, and the service life of the overall equipment of the slurry valve 100 is extended.

[0096] Using the pressure sensor 170, the pressure of the feed pipe section 112 is monitored in real time, and the pressure is dynamically adjusted through the exhaust device 137 and the air inflation pump 136 to maintain the pressure balance of the system and ensure the stability of the system operation.

[0097] The PLC controller 150 realizes the coordinated control of components such as motor actuators, solenoid valves 138, and inflation pumps 136, forming a closed-loop feedback system. The system has a rapid response and a high degree of intelligence, greatly improving work efficiency. Further, by accurately controlling the opening degree of the valve plate 120 through the motor actuator, unnecessary energy consumption is reduced. And the self-check function of the PLC controller 150 ensures the normal operation of the equipment before startup. Dynamically adjusting the pressure and suppressing the water hammer effect further reduces system failures and potential safety hazards.

[0098] Further, the limiting member 1121 is an electromagnet, and the method includes:

[0099] After the slurry valve 100 is closed, the electromagnet is powered off to release the outer housing 134.

[0100] It can be understood that by powering off and releasing the electromagnet after the slurry valve 100 is closed, the system can automatically optimize the response of the outer housing 134 and the pressure regulating airbag 132, thereby enhancing the sealing performance, suppressing the water hammer effect, and improving the stability and reliability of the system.

[0101] Further, the slurry valve 100 further includes an alarm device 180 and a status monitoring system 190; the method includes:

[0102] The status monitoring system 190 performs fault detection on the pressure sensor 170 and the position sensor. When the pressure sensor 170 or the position sensor fails or is abnormal, the status monitoring system 190 sends a signal to the alarm device 180, and the alarm device 180 triggers an audible and visual alarm signal.

[0103] It can be understood that by integrating the alarm device 180 and the status monitoring system 190 in the slurry valve 100, sensor failures or abnormalities can be detected in real time, and operators can be reminded through audible and visual alarms. This design improves the safety, reliability, and maintenance efficiency of the system, ensuring the stable operation of the slurry valve 100 under normal and abnormal working conditions. The system not only provides operators with a signal for quick response but also reduces the downtime caused by equipment failures, improving the continuity and safety of production.

[0104] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A slurry valve, characterized in that, It includes a valve body, a valve plate and a pressure regulating device; The valve body has a coaxially arranged feed pipe section and a discharge pipe section, and a plate bin formed between the feed pipe section and the discharge pipe section, and the plate bin is used to store the valve plate; The valve plate is also connected with an actuator located outside the plate bin, and driving the actuator can make the valve plate enter the connection part of the feed pipe section and the discharge pipe section from the plate bin to block the feed; The pressure regulating device includes a first expansion air bag, a pressure regulating air bag and a flexible air pipe connecting the first expansion air bag and the pressure regulating air bag; A first sealing plate is arranged on one side of the valve plate close to the feed pipe section, and the first expansion air bag is arranged between the first sealing plate and the valve plate; the pressure regulating air bag is arranged in the feed pipe section; After the slurry valve is closed, the slurry flows back and is pressurized in the feed pipe section, the gas in the pressure regulating air bag is compressed, and enters the first expansion air bag through the flexible air pipe, and the volume of the first expansion air bag expands to abut against the feed pipe section through the first sealing plate; A sealing ring is embedded in the first sealing plate, the sealing ring abuts against the feed pipe section, and the height of the sealing ring is flush with that of the first sealing plate; A spring is also arranged between the first sealing plate and the valve plate, and the spring is fixedly connected with the first sealing plate and the valve plate respectively; The feed pipe section also forms a receiving space for receiving the pressure regulating air bag; an outer housing is arranged on one side of the pressure regulating air bag close to the feed channel; When the slurry valve is opened, the pressure regulating air bag is received in the receiving space, and the slurry contacts the outer housing; When the slurry valve is closed, the slurry flows back, and due to the water hammer effect, the pressure regulating air bag breaks away from the receiving space, so that the slurry directly contacts the pressure regulating air bag.

2. The slurry valve according to claim 1, wherein 3. The slurry valve according to claim 2, wherein, The feed pipe section is also provided with a limiting member, and the limiting member cooperates with the outer housing.

4. The slurry valve according to claim 3, characterized in that, A plurality of flow disturbing plates are also arranged on one side of the outer housing close to the feed channel, and the flow disturbing plates are inclined towards the valve plate.

5. A control method for a slurry valve, applied to the slurry valve as described in claim 4, characterized in that, The pressure regulating device also includes an air pump and an exhaust device, and the air pump and the exhaust device are placed outside the valve body and are respectively communicated with the flexible air pipe. The actuator includes a motor actuator, and the slurry valve also includes a PLC controller, a position sensor and a pressure sensor. The position sensor is used to monitor the position of the valve plate in real time, and the pressure sensor is used to monitor the pressure in the feed pipe section in real time; an electromagnetic valve is also arranged between the first expansion air bag and the pressure regulating air bag; The method includes: Start the power supply, and the PLC controller performs self-checking. The self-checking includes checking the power-on states of the motor actuator, sensors, electromagnetic valve, air pump and the status monitoring system; after confirming that all devices are working normally, the slurry valve enters the standby working state; The PLC controller receives a flow demand signal, and determines the slurry flow rate and the valve plate position demand according to the flow demand signal; The PLC controller issues an instruction, and the motor actuator adjusts the opening of the valve plate according to the flow demand; The position sensor feeds back the position of the valve plate in real time to ensure that the valve plate reaches the target opening; The pressure sensor is used to monitor the pressure change in the feed pipe section in real time. If the detected pressure is too high, the gas in the pressure regulating airbag is discharged through the exhaust device; if the detected pressure is too low, the pressure regulating airbag is inflated by the air pump to increase the pressure. After the slurry valve is closed, a water hammer effect occurs in the feed pipe section. Under the action of the water hammer effect, the pressure regulating airbag actively contracts to inhibit the water hammer effect and reduce the damage to the valve plate caused by the water hammer effect. When the pressure regulating airbag actively contracts, the solenoid valve is opened. The contraction of the pressure regulating airbag can transport the gas to the first expansion airbag through the flexible air pipe, so that the first sealing plate is in sealing contact with the feed pipe section.

6. The control method according to claim 5, wherein The limiting member is an electromagnet, and the method includes: After the slurry valve is closed, the electromagnet is powered off to release the outer housing.

7. The control method according to claim 6, wherein The slurry valve further includes an alarm device and a status monitoring system; the method includes: The status monitoring system detects faults in the pressure sensor and the position sensor. When the pressure sensor or the position sensor fails or is abnormal, the status monitoring system sends a signal to the alarm device, and the alarm device triggers an audible and visual alarm signal.

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