Pneumatic double-control regulating valve

Abstract

The invention relates to the technical field of valves, and discloses a pneumatic double-control regulating valve which comprises a valve body, an inlet is formed in one side of the valve body, a process mounting hole is formed in the other side of the valve body, an outlet is formed in the bottom end of the valve body, a containing cavity is formed in the valve body, and a plurality of valve seats are arranged in the containing cavity of the valve body. A valve seat gasket is arranged on one side of the valve seat, a valve rod is arranged at the top end of the containing cavity of the valve body, a lining is arranged on the outer wall of the valve rod, a lining seat is arranged on one side of the lining, and a valve element is arranged at the bottom end of the outer wall of the valve rod. The sealing performance of the valve is enhanced through a one-way sealing and reverse adjusting mechanism. The anti-leakage pipeline is simple in structure and suitable for pipeline conveying of different forms of substances such as gas, liquid and powder, leakage can be effectively prevented, pollution to environments such as soil and water resources is avoided, and meanwhile resource waste and safety accident risks caused by leakage are reduced. The problem that a traditional adjusting valve is poor in sealing effect is solved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a pneumatic double-control regulating valve. Background Art

[0002] In modern industrial production and various fluid transportation systems, pipeline transportation, as an important material transportation method, is widely used in many fields such as chemical industry, petroleum, electricity, food, etc., covering the transportation of different forms of substances such as gas, liquid, powder, etc. The regulating valve is a key component in the pipeline system to control the flow, pressure and flow direction of the fluid. The performance of the regulating valve directly affects the stable operation and safety of the entire system.

[0003] Traditional control valves have many limitations in practical applications. First, in terms of sealing performance, most traditional control valves use a one-way sealing structure, which can only achieve sealing in one direction of the valve core's movement. For example, when the valve core moves downward to close the valve, it is sealed, but when it moves in the reverse direction, the sealing effect is often poor, which can easily lead to fluid leakage. In some working conditions with extremely high sealing requirements, such as the transportation of toxic and harmful gases or liquids in chemical production, once a leak occurs, it will not only cause material waste, but may also cause serious safety accidents, threaten the safety of personnel and damage the ecological environment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pneumatic dual-control regulating valve, which solves the problem of poor sealing effect of traditional regulating valves.

[0005] To achieve the above objectives, the present invention implements a pneumatic double-control regulating valve through the following technical scheme, including a valve body, one side of the valve body is provided with an inlet, the other side of the valve body is provided with a process installation hole, the bottom end of the valve body is provided with an outlet, the interior of the valve body is provided with an accommodating cavity, the accommodating cavity of the valve body is provided with a plurality of valve seats, a valve seat gasket is provided on one side of the valve seat, a valve stem is provided at the top of the accommodating cavity of the valve body, a bushing is provided on the outer wall of the valve stem, a bushing seat is provided on one side of the bushing, a valve core is provided at the bottom end of the outer wall of the valve stem, the outer wall of the valve core is provided on one side of the valve seat, and the valve core is provided in the accommodating cavity of the valve body.

[0006] Preferably, the top end of the valve body is threadedly connected to a valve cover by a bolt, a valve cover gasket is arranged at the bottom end of the valve cover, one end of the valve cover gasket is arranged at the top end of the bushing seat, one side of the bushing seat is arranged on one side of the valve body, and an adjusting valve shaft is arranged in the middle of the valve cover.

[0007] Preferably, the top end of the valve cover is threadably connected to a pressure plate via two bolts, one side of the pressure plate is arranged on the outer wall of the regulating valve shaft, and the bottom end of the pressure plate is provided with a pressure cover, one side of the pressure cover is arranged on the outer wall of the regulating valve shaft.

[0008] Preferably, a packing is provided at the bottom end of the pressure cover, one side of the packing is provided on the outer wall of the regulating valve shaft, and the other side of the packing is provided on one side of the valve cover, and a packing pad is provided at the bottom end of the packing, and one side of the packing pad is provided on the outer wall of the regulating valve shaft.

[0009] Preferably, an indicator needle is provided at the top end of the regulating valve shaft, and a clamping plate is provided at the top end of the indicator needle.

[0010] Preferably, the regulating valve shaft is connected to an actuator connecting shaft via a clamping plate, and the actuator connecting shaft passes through the top end of the bracket and is provided with an actuator.

[0011] Preferably, brackets are provided on both sides of the top of the valve cover, a scale is provided on one side of the bracket, a stroke controller is provided on one side of the bracket, and the top of the bracket is threadedly connected to the bottom end of the actuator through a nut.

[0012] The method for using the pneumatic double-control regulating valve is used for the pneumatic double-control regulating valve, comprising the following steps: S1. Install the valve body on the pipeline according to the flow direction requirements, install the valve seat, gasket, bushing, valve cover and gasket, packing in sequence, connect the actuator and the regulating valve shaft and install the actuator, finally install the stroke controller and calibrate the scale; S2. Perform air tightness test on the actuator, check for air leakage and deal with it; set the travel range, check the valve opening and closing smoothness, the matching of the valve core and the valve seat, calibrate the indicator needle and scale; test various control modes to ensure that the valve action meets the design requirements; S3. The valve is put into operation, and the valve opening is controlled by the actuator according to the process flow; the valve opening and pipeline system parameters are monitored during operation, and abnormalities are handled promptly; under special working conditions, the sealing mode is selected as required, and reverse adjustment is made promptly in case of leakage; S4. Regularly check valve components, including seals and bolts, and promptly handle any problems; clean the inner and outer surfaces of the valve; lubricate moving parts; regularly test the air tightness and stroke of the valve, and promptly repair or replace components when performance deteriorates.

[0013] Working principle: Install the valve body on the pipeline according to the flow direction requirements, and install the valve seat, gasket, bushing, valve cover, gasket, packing and other components in sequence. The valve seat and valve core cooperate to control the fluid channel, the gasket ensures the sealing of each connection part, the bushing ensures the stability of the valve stem movement, and the valve cover and packing further enhance the sealing effect. Connect the actuator and the regulating valve shaft, and install the stroke controller and calibration scale to lay the foundation for subsequent power transmission and opening control.

[0014] The actuator acts as a power source and generates an action after receiving an external control signal. The actuator connecting shaft is connected to the regulating valve shaft through a clamping plate, which transmits the power of the actuator to the regulating valve shaft, thereby driving the valve stem and valve core to move in the valve body. The stroke controller limits the stroke of the actuator according to the preset parameters, thereby accurately controlling the moving distance of the regulating valve shaft and realizing precise adjustment of the valve opening.

[0015] After the valve is put into operation, the external control system sends a control signal to the actuator according to the process flow to change the valve opening to adjust the fluid flow. The operator monitors the valve opening in real time by observing the position of the indicator needle on the scale. At the same time, the pressure, flow and other parameters of the pipeline system are monitored. If an abnormality occurs, the cause is analyzed in time and the valve opening is adjusted or the pipeline problem is checked.

[0016] In special working conditions, if zero leakage is required, the one-way sealing mode of the valve core upward or downward can be selected. If leakage occurs after long-term use, the two-way control characteristics of the valve can be used to reversely adjust the valve core to close it and achieve zero leakage again.

[0017] Regularly check valve components, including seals, bolts, etc., and promptly deal with damage or looseness. Clean the inner and outer surfaces of the valve to prevent impurities from affecting operation. Lubricate moving parts to reduce friction and wear. Regularly test the air tightness and stroke of the valve. If the performance deteriorates, promptly repair or replace parts to ensure long-term stable operation of the valve.

[0018] The present invention provides a pneumatic double-control regulating valve. It has the following beneficial effects: 1. The present invention enhances the sealing performance of the valve through a one-way seal and a reversely adjustable mechanism. It is suitable for pipeline transportation of substances in different forms such as gas, liquid, powder, etc. It can effectively prevent leakage, avoid pollution to the environment such as soil and water resources, and reduce the waste of resources and the risk of safety accidents caused by leakage. It solves the problem of poor sealing effect of traditional regulating valves.

[0019] 2. The present invention transmits the power of the external actuator to the internal valve stem and valve core by adjusting the valve shaft, thereby realizing accurate control of the valve core position, thereby being able to accurately adjust the valve opening, meet different requirements for fluid flow under different working conditions, and ensure the smooth progress of the production process. The problem of insufficient power transmission is solved.

[0020] 3. The sealing structure formed by the cover, packing and packing pad cooperates with each other in the present invention to effectively seal the gap between the regulating valve shaft and the valve cover, reducing the possibility of fluid leakage from this part, avoiding fluid loss caused by leakage and adverse effects on the surrounding environment. The shaft seal leakage problem between the regulating valve shaft and the valve cover is solved.

[0021] 4. The present invention can accurately convert the external control signal into the change of valve opening through the power transmission between the actuator, the actuator connecting shaft and the regulating valve shaft. Combined with the precise control of the actuator stroke by the stroke controller, the valve can achieve precise opening adjustment according to actual needs, meeting the requirements for precise control of fluid flow under different working conditions. The problem of insufficient valve adjustment accuracy is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front cross-sectional view of the present invention; Figure 2 It is a partial enlarged schematic diagram of the regulating valve shaft of the present invention; Figure 3 It is a partial enlarged schematic diagram of the valve cover of the present invention; Figure 4 It is an enlarged schematic diagram of the local structure of the valve core of the present invention; Figure 5 The figure is a flow chart of the method for using the present invention.

[0023] Among them, 1. valve body; 2. valve seat; 3. valve seat gasket; 4. valve stem; 5. bushing seat; 6. bushing; 7. valve cover; 8. packing pad; 9. packing; 10. scale; 11. process installation hole; 12. pressure cover; 13. pressure plate; 14. valve cover gasket; 15. actuator; 16. actuator connecting shaft; 17. clamp; 18. regulating valve shaft; 19. valve core; 20. inlet; 21. outlet; 22. bracket; 23. indicator needle. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Please refer to the attached Figure 1 , Attachment Figure 4 The embodiment of the present invention provides a pneumatic double-control regulating valve, including a valve body 1, an inlet 20 is provided on one side of the valve body 1, a process installation hole 11 is provided on the other side of the valve body 1, an outlet 21 is provided at the bottom end of the valve body 1, an accommodating cavity is provided inside the valve body 1, a plurality of valve seats 2 are provided in the accommodating cavity of the valve body 1, a valve seat gasket 3 is provided on one side of the valve seat 2, a valve stem 4 is provided at the top end of the accommodating cavity of the valve body 1, a bushing 6 is provided on the outer wall of the valve stem 4, a bushing seat 5 is provided on one side of the bushing 6, a valve core 19 is provided at the bottom end of the outer wall of the valve stem 4, the outer wall of the valve core 19 is provided on one side of the valve seat 2, and the valve core 19 is provided in the accommodating cavity of the valve body 1.

[0026] Specifically, the fluid enters from the inlet 20 on one side of the valve body 1, passes through the internal accommodating cavity of the valve body 1, and then flows out from the outlet 21 at the bottom. In the accommodating cavity of the valve body 1, a plurality of valve seats 2 are provided, and a valve seat gasket 3 is arranged on one side of the valve seat 2 to enhance the sealing effect. The valve stem 4 at the top of the accommodating cavity has a bushing 6 on its outer wall, and the bushing 6 is positioned and fixed by the bushing seat 5 to ensure the stability of the valve stem 4 during movement. The valve core 19 located at the bottom end of the outer wall of the valve stem 4 has its outer wall in contact with one side of the valve seat 2, and the valve core 19 is in the accommodating cavity of the valve body 1.

[0027] The regulating valve has three different control modes to achieve fluid control. The working principle of mode 1 is: when the external actuator 15 drives the valve stem 4 to drive the valve core 19 downward, the valve core 19 fits tightly with the valve seat 2, and the valve is closed to block the fluid channel; when the valve core 19 moves upward to the middle position of the valve body 1, the fluid can pass smoothly, the valve opens, and the circulation and flow regulation of the fluid are achieved.

[0028] The working principle of mode 2 is similar to that of mode 2, but the movement direction is opposite. When the actuator 15 drives the valve stem 4 to drive the valve core 19 upward, the valve core 19 fits against the valve seat 2 and the valve is closed; when the valve core 19 moves downward to the middle position of the valve body 1, the valve opens, and the fluid can flow from the inlet 20 through the inside of the valve body 1 to the outlet 21, thereby controlling the on-off and flow rate of the fluid.

[0029] Mode three is mainly used for extremely high requirements for valve sealing, that is, zero leakage is required. In this mode, the valve core 19 can be moved upward or downward according to the actual situation to achieve one-way sealing, so that the fluid cannot pass through the valve in the selected direction, thereby achieving a sealing effect. However, during long-term use, if any one-way seal leaks, resulting in a safety hazard, the actuator 15 drives the valve core 19 to adjust in the opposite direction so that it fits tightly with the valve seat 2 again, and the valve can be closed to achieve the purpose of zero leakage, thereby re-ensuring the sealing and safety of the system.

[0030] The one-way sealing and reverse adjustable mechanism greatly enhances the sealing performance of the valve. It is suitable for pipeline transportation of different forms of materials such as gas, liquid, powder, etc. Whether it is transporting gaseous natural gas, liquid chemical reagents or powdered food raw materials, this regulating valve can be used for effective fluid control, which can effectively prevent leakage and avoid pollution to the soil, water resources and other environments, while reducing the waste of resources and safety accident risks caused by leakage. It solves the problem of poor sealing effect of traditional regulating valves.

[0031] Please refer to the attached Figure 1 , Attachment Figure 3The top of the valve body 1 is connected to the valve cover 7 by a bolt and a thread, the bottom of the valve cover 7 is provided with a valve cover gasket 14, one end of the valve cover gasket 14 is arranged on the top of the bushing seat 5, one side of the bushing seat 5 is arranged on one side of the valve body 1, and the middle of the valve cover 7 is provided with an adjusting valve shaft 18.

[0032] Specifically, the top of the valve body 1 is threadedly connected to the valve cover 7 by bolt 1. This threaded connection method enables the valve cover 7 to be firmly installed on the valve body 1, which is convenient for subsequent disassembly, maintenance and assembly operations. A valve cover gasket 14 is arranged at the bottom end of the valve cover 7. One end of the valve cover gasket 14 is placed on the top of the bushing seat 5, and one side of the bushing seat 5 is tightly fitted on one side of the valve body 1. Through such a structural layout, the valve cover gasket 14 plays a sealing role between the valve cover 7, the bushing seat 5 and the valve body 1. When the valve cover 7 is installed in place, the valve cover gasket 14 is squeezed by its own gravity and the tightening force of bolt 1, so that the gasket can fill the small gap between the components and prevent the fluid from leaking from the connection between the valve body 1 and the valve cover 7.

[0033] At the same time, a regulating valve shaft 18 is provided in the middle of the valve cover 7, and the regulating valve shaft 18 is connected to the external actuator 15. When the actuator 15 receives the control signal and starts to operate, it will drive the regulating valve shaft 18 to perform corresponding axial movement. This axial movement of the regulating valve shaft 18 will transmit the movement to the valve stem 4 through the internal transmission components connected thereto, thereby driving the valve core 19 located at the bottom end of the outer wall of the valve stem 4 to move up and down in the accommodating cavity of the valve body 1, so as to control the relative position relationship between the valve core 19 and the valve seat 2, and finally realize the control of the on-off of the fluid channel and the flow rate.

[0034] By adjusting the valve shaft 18, the power of the external actuator 15 is transmitted to the internal valve stem 4 and valve core 19, and the position of the valve core 19 is precisely controlled, so that the valve opening can be accurately adjusted to meet the different requirements for fluid flow under different working conditions. For example, in chemical production, the flow of raw materials needs to be precisely controlled according to different chemical reaction stages. This structure can ensure that the regulating valve can stably and accurately adjust the flow to the corresponding set value to ensure the smooth progress of the production process. The problem of insufficient power transmission is solved.

[0035] Please refer to the attached Figure 1 -Attached Figure 2The top of the valve cover 7 is threadedly connected with a pressure plate 13 through bolts, one side of the pressure plate 13 is arranged on the outer wall of the regulating valve shaft 18, the bottom end of the pressure plate 13 is provided with a pressure cover 12, one side of the pressure cover 12 is arranged on the outer wall of the regulating valve shaft 18, the bottom end of the pressure cover 12 is provided with a packing 9, one side of the packing 9 is arranged on the outer wall of the regulating valve shaft 18, the other side of the packing 9 is arranged on one side of the valve cover 7, the bottom end of the packing 9 is provided with a packing pad 8, one side of the packing pad 8 is arranged on the outer wall of the regulating valve shaft 18, the top end of the regulating valve shaft 18 is provided with an indicator needle 23, and the top end of the indicator needle 23 is provided with a clamping plate 17.

[0036] Specifically, the top of the valve cover 7 is threadedly connected to the pressure plate 13 through bolt 2, and this connection method enables the pressure plate 13 to be firmly installed above the valve cover 7. One side of the pressure plate 13 is attached to the outer wall of the regulating valve shaft 18, which mainly plays the role of fixing and positioning, ensuring that the components connected thereto can be in the correct position.

[0037] A gland 12 is provided at the bottom end of the pressure plate 13. The gland 12 also has one side in contact with the outer wall of the regulating valve shaft 18. The gland 12 cooperates with the pressure plate 13 to apply a certain pressure to the packing 9 below. The packing 9 is located at the bottom end of the gland 12, one side of which is against the outer wall of the regulating valve shaft 18, and the other side is in contact with one side of the valve cover 7. A packing pad 8 is also provided at the bottom end of the packing 9, and the packing pad 8 is also in contact with the outer wall of the regulating valve shaft 18. The gland 12 squeezes the packing 9 and the packing pad 8 under the action of the pressure plate 13, so that the packing 9 can be tightly filled in the annular space between the regulating valve shaft 18 and the valve cover 7 to form a sealing structure, thereby preventing the fluid from leaking from the gap between the regulating valve shaft 18 and the valve cover 7.

[0038] The top of the regulating valve shaft 18 is provided with an indicator needle 23, and the top of the indicator needle 23 is provided with a clamping plate 17. The indicator needle 23 moves synchronously with the regulating valve shaft 18. When the regulating valve shaft 18 moves axially, such as moving up and down, under the drive of the external actuator 15, the indicator needle 23 will also move accordingly, and is connected with external related components such as the actuator connecting shaft 16 through the clamping plate 17 to realize power transmission and control of the movement of the regulating valve shaft 18. The operator can intuitively understand the stroke of the regulating valve shaft 18 by observing the position change of the indicator needle 23, and then judge the opening state of the valve.

[0039] The sealing structure formed by the cooperation of the gland 12, the packing 9 and the packing pad 8 effectively seals the gap between the regulating valve shaft 18 and the valve cover 7, greatly reducing the possibility of fluid leakage from this part, ensuring the overall sealing of the valve during operation, ensuring that the fluid is transported in the valve body according to the established flow direction, avoiding fluid loss due to leakage and adverse effects on the surrounding environment, such as preventing leakage from causing safety accidents and environmental pollution when transporting corrosive liquids or flammable and explosive gases. The shaft seal leakage problem between the regulating valve shaft 18 and the valve cover 7 is solved.

[0040] Please refer to the attached Figure 1 The regulating valve shaft 18 is connected to the actuator connecting shaft 16 through the clamping plate 17, the actuator connecting shaft 16 passes through the top of the bracket 22 and is provided with the actuator 15, brackets 22 are provided on both sides of the top of the valve cover 7, a scale 10 is provided on one side of the bracket 22, a stroke controller is provided on one side of the bracket 22, and the top of the bracket 22 is threadedly connected to the bottom of the actuator 15 through a nut.

[0041] Specifically, the regulating valve shaft 18 is connected to the actuator connecting shaft 16 by means of the clamping plate 17 to form power transmission. The actuator 15 is arranged at the top of the actuator connecting shaft 16, and the actuator connecting shaft 16 passes through the top of the bracket 22. When the actuator 15 receives an external control signal, it will generate corresponding power output to drive the actuator connecting shaft 16 to move axially. Since the regulating valve shaft 18 is connected to the actuator connecting shaft 16 by the clamping plate 17, the movement of the actuator connecting shaft 16 will be synchronously transmitted to the regulating valve shaft 18, thereby driving the valve stem 4 and the valve core 19 to move in the valve body 1 to adjust the valve opening.

[0042] The brackets 22 arranged on both sides of the top of the valve cover 7 play the role of supporting and fixing the actuator 15. The top of the bracket 22 is threadedly connected to the bottom of the actuator 15 through a nut, which ensures the stability of the installation of the actuator 15. The scale 10 arranged on one side of the bracket 22 cooperates with the indicator needle 23. The indicator needle 23 moves with the regulating valve shaft 18, and its position change on the scale 10 can intuitively reflect the size of the valve opening. At the same time, the stroke controller on one side of the bracket 22 can accurately control the stroke of the actuator 15. According to the preset parameters, the moving distance of the actuator connecting shaft 16 is limited, thereby accurately controlling the stroke of the regulating valve shaft 18, and finally realizing the precise adjustment of the valve opening.

[0043] Through the power transmission between the actuator 15, the actuator connecting shaft 16, and the regulating valve shaft 18, the external control signal can be accurately converted into the change of the valve opening. Combined with the precise control of the actuator 15 stroke by the stroke controller, the valve can achieve precise opening adjustment according to actual needs, meeting the requirements for precise control of fluid flow under different working conditions. The problem of insufficient valve adjustment accuracy is solved.

[0044] Please refer to the attached Figure 5 The method for using the pneumatic double-control regulating valve includes the following steps: S1. Install the valve body 1 on the pipeline according to the flow direction requirements, install the valve seat 2, gasket, bushing 6, valve cover 7 and gasket, packing 9 in sequence, connect the actuator 15 and the regulating valve shaft 18 and install the actuator 15, finally install the stroke controller and calibrate the scale 10; S2. Perform air tightness test on the actuator 15, check for air leakage and deal with it; set the travel range, check the valve opening and closing smoothness, the matching of the valve core 19 and the valve seat 2, calibrate the indicator needle 23 and the scale 10; test various control modes to ensure that the valve action meets the design requirements; S3. The valve is put into operation, and the valve opening is controlled by the actuator 15 according to the process flow; the valve opening and pipeline system parameters are monitored during operation, and abnormalities are handled promptly; under special working conditions, the sealing mode is selected as required, and reverse adjustment is made promptly in case of leakage; S4. Regularly check valve components, including seals and bolts, and promptly handle any problems; clean the inner and outer surfaces of the valve; lubricate moving parts; regularly test the air tightness and stroke of the valve, and promptly repair or replace components when performance deteriorates.

[0045] Specifically, the valve body 1 is installed in the pipeline according to the flow direction requirements, which is the basis for ensuring that the fluid can normally enter and flow out of the regulating valve according to the preset path. The valve seat 2, gasket, bushing 6, valve cover 7, gasket, packing 9 and other components are installed in sequence. The valve seat 2 is installed inside the valve body 1 to cooperate with the valve core 19 to realize the on-off control of the fluid channel, and the gasket plays a sealing role to prevent the fluid from leaking in the connection gaps of the components; the bushing 6 is installed on the outer wall of the valve stem 4 to ensure the stability of the movement of the valve stem 4; the valve cover 7 is fixed to the top of the valve body 1 through a suitable connection method, and the gasket inside it further enhances the sealing effect, and the packing 9 is used to seal the space between the regulating valve shaft 18 and the valve cover 7. After that, the actuator 15 is connected to the regulating valve shaft 18. The actuator 15 acts as a power source. When receiving the control signal, it will generate a corresponding action, and transmit the power to the regulating valve shaft 18 through the connecting components, thereby driving the valve stem 4 and the valve core 19 connected thereto to move. After installing the actuator 15, install the stroke controller and calibrate the scale 10. The stroke controller can limit the movement stroke of the actuator 15 according to the set parameters. The scale 10 and the indicator needle 23 can cooperate to intuitively display the opening of the valve, thereby realizing the construction of the basic architecture for precise control of the valve opening.

[0046] When the air tightness test of the actuator 15 is performed, the gas of the specified pressure is introduced into the actuator 15, and then the various connection parts, sealing parts, etc. are checked for gas leakage. If there is leakage, it means that there is a problem with the sealing of these parts, which may be caused by damage to the seal, loose connection, etc., and targeted treatment is required, such as replacing the seal, re-tightening the connection parts, etc., so as to ensure that the sealing of the actuator 15 itself is good and avoid the influence of leakage on the normal control of the valve in the subsequent process. Setting the stroke range is to accurately set the maximum and minimum stroke distances of the actuator 15 to drive the regulating valve shaft 18 to move through the stroke controller, so that when operating the valve, it can ensure that the valve stem 4 and the valve core 19 move within the specified range, so that the valve opens and closes smoothly and meets the expected opening adjustment requirements. Checking the smoothness of valve opening and closing is to manually or electrically operate the actuator 15 to observe whether the contact and separation process between the valve core 19 and the valve seat 2 is smooth, whether there is jamming, blocking, etc. If there is a problem, it may be due to insufficient component installation accuracy, impurities entering, etc., which need to be promptly investigated and solved. The purpose of calibrating the indicator needle 23 and the scale 10 is to ensure that the position indicated by the indicator needle 23 can accurately reflect the actual opening of the valve, so that the operator can intuitively and accurately know the valve status. To test various control modes, the valve opening and closing and sealing conditions corresponding to different actions such as the upward and downward movements of the valve core 19 and the valve stem 4 are respectively operated according to the different control modes designed, and whether the actual movement of the valve is consistent with the design requirements is observed. If not, it is necessary to check whether there are problems in the control circuit, the action logic of the actuator 15, etc. and make adjustments to ensure that the valve can accurately perform corresponding actions according to different working conditions.

[0047] After the valve is put into operation, according to the process flow, the external control system will send a corresponding control signal to the actuator 15. The actuator 15 drives the regulating valve shaft 18 to move according to the signal, and the regulating valve shaft 18 drives the valve stem 4 and the valve core 19 to move, thereby changing the relative position between the valve core 19 and the valve seat 2, realizing the control of the valve opening, and then adjusting the fluid flow to meet the requirements of the process flow. During the operation process, the operator needs to monitor the valve opening and pipeline system parameters in real time, grasp the valve opening by observing the correspondence between the indicator needle 23 and the scale 10, and pay attention to the changes in parameters such as pressure and flow in the pipeline. Once abnormal parameters are found, such as a sudden increase or decrease in flow, abnormal pressure fluctuations, etc., it may be a valve failure, pipeline blockage or other problems. It is necessary to analyze the cause in time and take corresponding treatment measures, such as adjusting the valve opening and checking whether the pipeline is blocked. Under special working conditions, such as when zero leakage is required, select the appropriate sealing mode such as the upward or downward one-way sealing of the valve core 19 as required. When leakage occurs after long-term use, use the two-way control characteristics of the valve to adjust the valve core 19 in the opposite direction in time to close it, so as to achieve zero leakage again and ensure the sealing and safety of the entire system.

[0048] Regular inspection of valve components means checking each valve component, including seals, bolts, etc., at a certain time period. Seals may age and wear after long-term use, resulting in reduced sealing performance. Bolts may become loose due to vibration and other reasons. These problems can be discovered in time through inspection. If the seal is found to be damaged, replace the seal. If the bolt is loose, tighten it to maintain the normal state of each valve component. Cleaning the inner and outer surfaces of the valve is to remove dust and impurities attached to the valve surface and dirt that may accumulate inside the valve body 1 to prevent these impurities from affecting the normal operation of the valve. For example, impurities entering between the valve core 19 and the valve seat 2 may cause problems such as poor sealing and jamming of moving parts.

[0049] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pneumatic double-control regulating valve, comprising a valve body (1), characterized in that: An inlet (20) is provided on one side of the valve body (1), a process installation hole (11) is provided on the other side of the valve body (1), an outlet (21) is provided at the bottom end of the valve body (1), a receiving cavity is provided inside the valve body (1), a plurality of valve seats (2) are provided in the receiving cavity of the valve body (1), a valve seat gasket (3) is provided on one side of the valve seat (2), a valve stem (4) is provided at the top end of the receiving cavity of the valve body (1), a bushing (6) is provided on the outer wall of the valve stem (4), a bushing seat (5) is provided on one side of the bushing (6), a valve core (19) is provided at the bottom end of the outer wall of the valve stem (4), the outer wall of the valve core (19) is provided on one side of the valve seat (2), and the valve core (19) is provided in the receiving cavity of the valve body (1).

2. The pneumatic double-control regulating valve according to claim 1 is characterized in that: The top end of the valve body (1) is connected to a valve cover (7) via a bolt and a thread, a valve cover gasket (14) is provided at the bottom end of the valve cover (7), one end of the valve cover gasket (14) is arranged at the top end of the bushing seat (5), one side of the bushing seat (5) is arranged at one side of the valve body (1), and an adjusting valve shaft (18) is provided in the middle of the valve cover (7).

3. The pneumatic dual-control regulating valve according to claim 2 is characterized in that: The top end of the valve cover (7) is threadedly connected to a pressure plate (13) via two bolts, one side of the pressure plate (13) is arranged on the outer wall of the regulating valve shaft (18), and the bottom end of the pressure plate (13) is provided with a pressure cover (12), one side of the pressure cover (12) is arranged on the outer wall of the regulating valve shaft (18).

4. The pneumatic dual-control regulating valve according to claim 3 is characterized in that: A packing (9) is arranged at the bottom end of the gland (12), one side of the packing (9) is arranged on the outer wall of the regulating valve shaft (18), and the other side of the packing (9) is arranged on one side of the valve cover (7); a packing pad (8) is arranged at the bottom end of the packing (9), and one side of the packing pad (8) is arranged on the outer wall of the regulating valve shaft (18).

5. The pneumatic dual-control regulating valve according to claim 4 is characterized in that: The top end of the regulating valve shaft (18) is provided with an indicator needle (23), and the top end of the indicator needle (23) is provided with a clamping plate (17).

6. The pneumatic dual-control regulating valve according to claim 5, characterized in that: The regulating valve shaft (18) is connected to an actuator connecting shaft (16) via a clamping plate (17); the actuator connecting shaft (16) passes through the top end of the bracket (22) and is provided with an actuator (15).

7. The pneumatic dual-control regulating valve according to claim 2, characterized in that: Brackets (22) are provided on both sides of the top end of the valve cover (7), a scale (10) is provided on one side of the bracket (22), a stroke controller is provided on one side of the bracket (22), and the top end of the bracket (22) is threadedly connected to the bottom end of the actuator (15) via a nut.

8. A method for using a pneumatic double-control regulating valve, used for the pneumatic double-control regulating valve according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Install the valve body 1 on the pipeline according to the flow direction requirements, install the valve seat 2, gasket, bushing 6, valve cover 7 and gasket, packing 9 in sequence, connect the actuator 15 and the regulating valve shaft 18 and install the actuator 15, finally install the stroke controller and calibrate the scale 10; S2. Perform air tightness test on the actuator 15, check for air leakage and deal with it; set the travel range, check the valve opening and closing smoothness, the matching of the valve core 19 and the valve seat 2, calibrate the indicator needle 23 and the scale 10; test various control modes to ensure that the valve action meets the design requirements; S3. The valve is put into operation, and the valve opening is controlled by the actuator 15 according to the process flow; the valve opening and pipeline system parameters are monitored during operation, and abnormalities are handled promptly; under special working conditions, the sealing mode is selected as required, and reverse adjustment is made promptly in case of leakage; S4. Regularly check valve components, including seals and bolts, and promptly handle any problems; clean the inner and outer surfaces of the valve; lubricate moving parts; regularly test the air tightness and stroke of the valve, and promptly repair or replace components when performance deteriorates.

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