A self-resetting liquid level control valve

Abstract

This invention belongs to the field of steam heating technology and discloses a self-resetting liquid level control valve, including an end cover assembly, a valve body, a valve core assembly, an intermediate auxiliary plate, and a cylinder assembly. The cylinder assembly is mounted on the end cover assembly, and the cylinder piston rod is connected to the valve stem. Under normal circumstances, the cylinder assembly does not participate in control. Liquid flows in from the valve inlet, and the valve is initially closed. As the liquid volume increases, the liquid level rises, and the buoyancy force on the valve core increases. When the buoyancy force exceeds the pressure required to close the valve, it opens. When the valve opens, liquid flows out from the outlet, and the liquid level continuously decreases. The valve does not close immediately as liquid flows out; it closes only when the liquid level drops to a certain height. An upper liquid level sensor and a lower liquid level sensor are installed inside the valve. When the liquid level is below the lower limit, the valve is not closed, and the cylinder forcibly closes the valve. When the liquid level is above the upper limit, the valve is not open, and the cylinder forcibly opens the valve. The opening and closing of the valve are fed back by a proximity switch on the cylinder assembly.

Description

Technical Field

[0001] This invention belongs to, but is not limited to, the field of steam heating technology, and particularly relates to a self-resetting liquid level control valve. Background Technology

[0002] Steam heating is a very important heating method, widely used due to its fast heat transfer, high efficiency, and ease of control. However, steam heating consumes a lot of energy. During the heating process, steam produces condensate, and the amount of condensate affects heating efficiency. To ensure effective steam heating, condensate needs to be drained. Delayed condensate drainage reduces heating efficiency, while excessive drainage results in steam being discharged along with the condensate, leading to significant steam waste. Therefore, using a reliable liquid level control valve is essential to ensure both heating efficiency and low energy consumption.

[0003] Based on the above analysis, the urgent technical problems that need to be solved in the existing technology are: untimely discharge of condensate affects heating efficiency, and excessive discharge will be mixed with steam and discharged at the same time, resulting in a large amount of steam waste. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a self-resetting liquid level control valve that reduces energy consumption in steam heating methods.

[0005] This invention is implemented as follows: a self-resetting liquid level control valve includes an intermediate auxiliary plate. An end cap assembly and a valve body are respectively mounted on the upper and lower sides of the intermediate auxiliary plate. The intermediate auxiliary plate, end cap assembly, and valve body are fastened together with screws. The intermediate auxiliary plate and valve body are sealed with O-ring seals. The central hole of the intermediate auxiliary plate is sealed with packing material, preventing liquid leakage when the valve core assembly moves up and down. The valve is initially normally closed, with liquid flowing into the valve from the inlet. As the liquid level increases to a certain level, the valve opens, and liquid is discharged from the outlet. Valve closure and opening are fed back by a proximity switch signal. The valve body contains an upper limit liquid level sensor and a lower limit sensor. When the liquid level is below the lower limit or above the upper limit, if the valve is not closed or open, the controller forcibly closes or opens the valve by controlling a cylinder assembly.

[0006] Furthermore, the valve core assembly includes a valve stem, a float, a support pad, a valve core seal, a compression pad, a washer, and a nut. In the initial state, the valve core assembly closes the valve. At this time, the valve core seal and the valve body center hole are tightly pressed together. The valve stem is equipped with a float. As the liquid level inside the valve continuously rises, the buoyancy of the float continuously increases. When the buoyancy overcomes the pressure of closing the valve, the valve core assembly moves upward rapidly, thereby opening the valve.

[0007] Furthermore, the valve core assembly moves upward until the spherical surface of the round-headed pin fits against the concave surface of the valve stem. Under the push of the spring force, the round-headed pin locks the valve stem, the valve core assembly stops moving and remains stationary. At this time, the valve remains open, and liquid flows out from the valve outlet.

[0008] Furthermore, the end cap assembly includes an end cap, a round-headed pin, a spring, and a plug. The four side holes of the end cap are evenly distributed. Structurally and functionally, each hole is controlled by a plug that pushes a spring, which in turn pushes the round-headed pin. Under the force of the spring, the spherical surface of the round-headed pin radially engages with the valve stem. The plug can adjust the thrust of the round-headed pin; the greater the thrust, the greater the buoyancy required for the valve core assembly when the valve is open, and vice versa when the valve is closed.

[0009] Furthermore, as the liquid flows out of the valve outlet, the buoyancy decreases, but the valve stem assembly does not immediately move downward to close the valve. As the liquid level decreases, the buoyancy gradually decreases. When the sum of the weight of the valve core assembly and the spring pressure is greater than the sum of the total resistance of the four round pins and the buoyancy, the valve core assembly moves downward to close the valve.

[0010] Furthermore, the cylinder assembly includes a proximity switch and a proximity switch. A mounting bracket is welded to the plug, and the cylinder assembly, proximity switch, and proximity switch are fixed on this mounting bracket. The proximity switch provides feedback on the maximum valve opening (fully open). When the liquid level reaches the upper limit (feedback from the liquid level sensor), the proximity switch provides no feedback signal, and the controller briefly forces the valve open via the cylinder. When the valve is open, the proximity switch provides feedback on the valve closing. When the liquid level is below the lower limit (feedback from the liquid level sensor), the controller briefly forces the valve close via the cylinder.

[0011] Furthermore, the valve body uses a flange connection, and the internal cavity of the valve body is equipped with a lower limit liquid level sensor and an upper limit liquid level sensor.

[0012] Furthermore, in actual use, valves inevitably experience jamming when the valve stem reaches a certain point. The cylinder can forcefully open or close the valve to eliminate the jamming by using external force, reducing troubleshooting and maintenance time. The level sensor and proximity switch provide linked feedback signals, which can transmit the valve status and provide alarms for the type of fault when abnormalities occur.

[0013] Based on the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solution to be protected by this invention are as follows:

[0014] First, the valve is structurally equipped with a sensor to monitor the liquid level and a proximity switch to provide feedback on the valve's opening and closing. The valve also has a cylinder assembly for forced opening or closing. If the liquid level is higher than the set upper limit and the valve is not yet open, the cylinder will force the valve to open; if the liquid level is lower than the lower limit and the valve is not yet closed, the cylinder will force the valve to close.

[0015] This invention connects a valve to a control terminal, enabling real-time monitoring of the valve's opening and closing status. In case of abnormalities, it can control a cylinder to intervene in the valve's operation. During normal operation, the valve opens and closes automatically due to its own technical structure, ensuring it opens when a certain liquid level is reached and closes when the liquid level is reached; the cylinder does not participate in the control.

[0016] Secondly, existing level control valve technologies are prone to problems such as liquid leakage, valve core jamming, and inaccurate level monitoring during use, leading to unstable valve opening and closing, which in turn affects the normal operation of the entire system. Furthermore, existing valve operations are mostly manual or simple automated control, lacking sophisticated feedback systems and automatic adjustment functions, making them unable to cope with complex level changes, particularly in terms of float control accuracy and valve response speed.

[0017] This invention successfully solves the problems of poor sealing, valve core jamming, and inaccurate level control in traditional level control valves by designing a self-resetting level control valve. The device introduces a float to control the opening and closing of the valve core, combined with the forced control function of a cylinder assembly, ensuring that the valve can open or close promptly and reliably at the upper and lower liquid levels. Furthermore, the valve employs a multi-layer sealing and feedback mechanism internally, greatly reducing the risk of liquid leakage and enhancing the stability and safety of the overall system.

[0018] Compared with traditional level control valves, this invention achieves several significant technological advancements. First, the linkage design between the float and the valve core improves the automation of level control and reduces manual intervention. Second, the forced switching function of the cylinder assembly effectively solves the valve core jamming problem, ensuring valve reliability under complex operating conditions. Third, the linkage feedback system between the level sensor and the proximity switch can monitor the valve status in real time, providing more precise level control and fault alarm functions, thus improving the system's intelligence level.

[0019] This invention has significant application prospects in the field of industrial automation level control, especially in scenarios requiring high-precision level control, such as those in the chemical, pharmaceutical, and petroleum industries. Its automated and intelligent design greatly improves system efficiency and safety, reducing manual intervention and maintenance costs. Furthermore, through a precise control and feedback system, this level control valve can operate stably for extended periods, significantly reducing downtime caused by equipment failures and providing a highly efficient and reliable level control solution for related industries. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the self-resetting liquid level control valve provided in an embodiment of the present invention;

[0021] Figure 2This is a schematic diagram illustrating the working principle of the self-resetting liquid level control valve when it is closed, as provided in this embodiment of the invention.

[0022] Figure 3 This is a schematic diagram illustrating the working principle of the self-resetting liquid level control valve when it is opened, as provided in this embodiment of the invention.

[0023] Figure 4 This is a curve showing the temperature-pressure change of the heater during the valve closing to opening process provided in an embodiment of the present invention;

[0024] Figure 5 This is a temperature-pressure change curve provided in an embodiment of the present invention for each valve discharge completion;

[0025] Figure 6 This is a graph showing the change in unit consumption provided in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the unit consumption change curve provided in an embodiment of the present invention;

[0027] In the diagram: 001, O-ring seal; 002, packing seal; 003, plug; 004, spring; 005, screw; 006, upper limit level sensor; 007, level sensor; 100, valve body; 200, intermediate auxiliary plate; 300, end cap assembly; 301, end cap; 302, round head pin; 303, spring; 304, plug; 400, valve core assembly; 401, valve stem; 402, float; 403, support pad; 404, valve core seal; 405, clamping pad; 406, washer; 407, nut; 500, cylinder assembly; 501, proximity switch; 502, proximity switch. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Example 1: Application in a chemical plant storage tank level control system

[0030] In chemical plant storage tank level control, liquid needs to be transferred between different tanks according to production requirements. Traditional level control valves suffer from leakage or unstable flow during liquid transfer due to poor sealing or valve core jamming. The self-resetting level control valve provided by this invention solves these problems.

[0031] In this application, the liquid level in the storage tank is monitored in real time by a level sensor. When the liquid level reaches the set upper limit, the buoyancy of the float pushes the valve assembly upward, automatically opening the valve and allowing liquid to flow out. Simultaneously, a proximity switch provides feedback on the valve's open state, ensuring smooth liquid discharge. When the liquid level drops to the set lower limit, the level sensor and proximity switch work together to control the valve to close, preventing over- or under-limit liquid flow. Furthermore, the cylinder assembly provides a forced-open / close function when the valve movement is sluggish, ensuring stable system operation in complex chemical environments and reducing maintenance requirements.

[0032] Example 2: Application in an automatic liquid level control system for a wastewater treatment plant

[0033] In the automatic level control system of a wastewater treatment plant, accurately controlling the liquid level in each treatment tank is a crucial step in ensuring treatment efficiency. Traditional valves, when controlling wastewater levels, are prone to valve core jamming and valve malfunction due to impurities in the wastewater, thus affecting the entire wastewater treatment process.

[0034] The self-resetting level control valve of this invention controls the liquid level via a float and combines this with a cylinder assembly for forced switching, effectively addressing impurities and floating debris in wastewater. A level sensor monitors the liquid level in each treatment tank in real time. When the level reaches the set upper limit, the valve automatically opens to discharge wastewater. When the level drops to the set lower limit, the valve automatically closes, maintaining a suitable liquid level in the treatment tank. The cylinder assembly can forcibly activate the valve when impurities cause it to jam, avoiding the malfunctions of traditional valves. Furthermore, the level sensor and proximity switch provide reliable real-time feedback and alarm functions, ensuring stable operation of the wastewater treatment process.

[0035] The self-resetting liquid level control valve provided in this embodiment of the invention includes an intermediate auxiliary plate 200. An end cap assembly 300 and a valve body 100 are respectively mounted on the upper and lower sides of the intermediate auxiliary plate 200. The intermediate auxiliary plate 200, end cap assembly 300, and valve body 100 are fastened together using screws 005. The intermediate auxiliary plate 200 and valve body 100 are sealed by an O-ring seal 001. A packing seal 002 is installed in the center hole of the intermediate auxiliary plate 200. Liquid will not leak when the valve core assembly 400 moves up and down. The valve is initially normally closed, with liquid flowing into the valve from the valve inlet. As the liquid level increases and reaches a certain level, the valve opens, and liquid is discharged from the valve outlet. Valve closure and opening are fed back by a proximity switch signal. The valve body contains an upper limit liquid level sensor 006 and a lower limit sensor 007. When the liquid level is below the lower limit or above the upper limit, the valve is either not closed or not open. The controller forcibly closes or opens the valve by controlling the cylinder assembly 500.

[0036] The valve core assembly 400 includes a valve stem 401, a float 402, a support pad 403, a valve core seal 404, a pressure pad 405, a washer 406, and a nut 407. In the initial state, the valve core assembly 400 closes the valve. At this time, the valve core seal 404 and the center hole of the valve body 100 are tightly pressed together. The valve stem 401 is equipped with a float 402. As the liquid level inside the valve continuously rises, the buoyancy of the float 402 continuously increases. When the buoyancy overcomes the pressure of closing the valve, the valve core assembly 400 moves upward rapidly, thereby opening the valve.

[0037] The valve core assembly 400 moves upward until the spherical surface of the round head pin 302 is in contact with the concave surface of the valve stem 401. Under the push of the spring force, the round head pin 302 locks the valve stem 401, the valve core assembly 400 stops moving and remains stationary. At this time, the valve remains open and the liquid flows out from the valve outlet.

[0038] The end cap assembly 300 includes an end cap 301, a round-headed pin 302, a spring 303, and a plug 304. The end cap 301 has four evenly distributed side holes. Structurally and functionally, each hole is controlled by the plug 304 pushing the spring 303, which in turn pushes the round-headed pin 302. Under the spring force, the spherical surface of the round-headed pin 302 radially engages with the valve stem 401. The plug 304 can adjust the thrust of the round-headed pin 302. A greater thrust requires more buoyancy for the valve core assembly 400 when the valve is open, and vice versa when the valve is closed.

[0039] When the liquid flows out of the valve outlet, the buoyancy decreases, but the valve stem assembly 400 does not immediately move downward to close the valve. As the liquid level decreases, the buoyancy gradually decreases. When the sum of the weight of the valve core assembly 400 and the pressure of the spring 004 is greater than the sum of the total resistance of the four round head pins 302 and the buoyancy, the valve core assembly 400 moves downward to close the valve.

[0040] The cylinder assembly 500 includes proximity switches 501 and 502. A mounting bracket is welded to the plug 003, and the cylinder assembly 500, proximity switches 501 and 502 are fixed on this mounting bracket. Proximity switch 501 provides feedback on the maximum valve opening (fully open). When the liquid level reaches the upper limit (feedback from liquid level sensor 006), proximity switch 501 has no feedback signal, and the controller briefly forces the valve open via the cylinder. When the valve is open, proximity switch 502 provides feedback on the valve closing. When the liquid level is below the lower limit (feedback from liquid level sensor 007), the controller briefly forces the valve close via the cylinder.

[0041] The valve body 100 uses a flange connection, and the inner cavity of the valve body is equipped with a lower limit liquid level sensor 007 and an upper limit liquid level sensor 006.

[0042] In actual use, valves inevitably experience jamming when the valve stem reaches a certain point. The cylinder can forcefully open or close the valve to eliminate the jamming by using external force, reducing troubleshooting and maintenance time. The liquid level sensor and proximity switch provide feedback signals to transmit the valve status and provide alarms for the type of fault when abnormalities occur.

[0043] The self-resetting liquid level control valve provided by this invention forms an integral structure through the tight connection of the intermediate auxiliary plate 200, the end cap assembly 300, and the valve body 100. An O-ring seal 001 is used to seal the mating surface between the intermediate auxiliary plate 200 and the valve body 100, ensuring that the liquid does not leak when the valve core assembly 400 moves up and down. The valve is initially closed, and liquid enters through the valve inlet. As the liquid level increases, when the liquid level reaches the preset upper limit, the buoyancy generated by the float ball 402 overcomes the pressure of closing the valve, pushing the valve core assembly 400 upward, opening the valve, and discharging the liquid from the outlet. The entire system achieves automatic liquid discharge and valve opening / closing switching through sealing and buoyancy control.

[0044] The valve core assembly 400 includes a valve stem 401 and a float 402. The buoyancy of the float is a key factor in controlling the valve opening. As the liquid level rises, the buoyancy of the float increases. When the buoyancy is sufficient to overcome the pressure when the valve is closed, the valve core assembly 400 moves upward, and the valve opens. When the valve is open, the float pushes the valve stem upward until the spherical surface of the round-headed pin 302 engages with the concave surface of the valve stem. Under the action of the spring 303, the valve core assembly 400 is locked, keeping the valve in the open state. Liquid flows out from the outlet until the liquid level drops to the lower limit.

[0045] When the valve core assembly 400 moves upward to the open position, the locking device consisting of the round-headed pin 302 and the spring 303 fixes the valve stem. The round-headed pin is pushed against the valve stem by the spring, ensuring its stability. The plug 304 adjusts the buoyancy required for the valve to open and close by changing the spring's thrust. This design ensures that the valve opens smoothly when the float moves upward, and as the liquid level drops, the buoyancy gradually decreases. When the buoyancy is less than the sum of gravity and spring pressure, the valve core assembly 400 moves downward to close the valve.

[0046] To prevent jamming caused by friction during valve core movement, the cylinder assembly 500 can forcefully open or close the valve. When the level sensor 006 or 007 sends an upper or lower limit signal, the controller determines the position based on the signals from proximity switches 501 and 502. The cylinder assembly can then intervene briefly with external force to maintain normal valve operation and eliminate jamming. This function reduces the need for manual intervention and improves valve reliability and efficiency.

[0047] Liquid level sensors 006 and 007 are installed within the valve body to monitor the upper and lower limits of the liquid level. When the liquid level reaches the upper or lower limit, the sensor sends a signal to the controller, which then determines whether the valve needs to be opened or closed based on the feedback signal. Simultaneously, proximity switches 501 and 502 also provide feedback on the valve's status, ensuring that the valve's state when fully open or closed is clearly defined. This sensor-switch linkage mechanism allows for real-time monitoring of the valve's status, preventing malfunctions.

[0048] When a valve malfunctions during operation, such as failing to open or close properly, the system can diagnose the fault using feedback signals from the level sensor and proximity switch. If the level signal and proximity switch signal do not match, the controller will automatically alarm to alert the operator for maintenance. This design reduces fault finding and repair time, improves system safety and maintenance efficiency, and ensures the reliability and stability of the level control valve in actual use.

[0049] A self-resetting level control valve includes an end cap assembly 300, an O-ring seal 001, a packing seal 002, a plug 003, a spring 004, a screw 005, a level sensor 006, a level sensor 007, a cylinder assembly 500, a valve body 100, a valve core assembly 400, and an intermediate auxiliary plate 200. Its characteristic is that condensate generated by steam heating flows into the self-resetting level control valve from a pipeline. The valve is initially in a normally closed state, and condensate continuously accumulates (see appendix). Figure 2 When the liquid level reaches a certain height (the liquid level height is determined by the spring forces of springs 303 and 004), the valve passage opens, and the valve stem 401 moves upward and is locked by the round-head pin 302 (see appendix). Figure 3 Condensate is discharged from the outlet. When the valve is open, condensate is continuously discharged, and the liquid level drops to a certain height. The sum of the spring force of spring 004 and the weight of valve core assembly 400 is greater than the sum of the thrust and buoyancy of spring 303, and valve stem 401 moves down to close the valve.

[0050] The valve is set with a maximum upper limit and a minimum lower limit. When the valve is closed, the condensate level is higher than the lower limit, preventing water vapor from escaping and thus reducing steam waste. The upper limit level sensor 006, lower limit level sensor 007, proximity switch 501, and indirect switch 502 send feedback signals to the PLC. When the condensate level reaches the lower limit, if the valve is not closed, the PLC controls a cylinder to forcibly close the valve. This forced control method avoids steam waste and reduces energy consumption. When the condensate level reaches the upper limit, if the valve is not open, the PLC also controls a cylinder to forcibly open the valve. Excessive condensate affects heating efficiency; forcibly opening the valve ensures the correct temperature, especially important for product manufacturing processes with high temperature requirements, thus guaranteeing a high yield of high-quality products.

[0051] In practical applications, valve jamming is unavoidable. This jamming affects normal discharge, and the resulting malfunctions require significant time to troubleshoot. However, this does not necessarily mean the valve is damaged. Simply using external force to push the valve stem out of the jamming point will restore the valve to normal operation. If the valve opens or closes abnormally, it can be reset by using a cylinder to force it open or close.

[0052] The self-resetting level control valve is an energy-saving and consumption-reducing valve that can be applied to pipeline systems for liquid discharge control. It is suitable for situations where the discharged liquid has a gradual accumulation process, especially in equipment and pipelines using steam heating. As heat is continuously consumed during steam heating, some of the steam will condense into water when it encounters cold air. The more water accumulates, the more it will affect the heating effect. The discharge of condensate is crucial. In order to achieve efficiency, it is often necessary to both heat steam and reduce energy consumption. The self-resetting level control valve continuously collects the accumulated condensate. When the collected condensate reaches a certain volume, it is discharged. During the discharge of condensate, the steam is isolated and does not escape, which greatly reduces the waste caused by steam discharge. Taking a steam-heated vulcanizing machine as an example, during the vulcanization process of a tire, steam flows through pipes into the hot plate to heat the vulcanized tire blank. During the heating process, the steam will condense into water. If too much condensate accumulates in the hot plate, the heating effect will be poor and the heating temperature will drop. If the temperature does not meet the process requirements, it will result in defective products. In order to ensure the heating temperature, the condensate must be discharged. The amount and time of condensate discharge cannot be controlled. The only option is to continuously discharge condensate to maintain the temperature. At this time, steam will also be discharged, which will not achieve energy saving and consumption reduction. Using a self-resetting liquid level control valve can ensure that only condensate is discharged without wasting steam, thus truly achieving the effect of energy saving and consumption reduction.

[0053] In nature, whether liquid or gas, substances with higher density will rise to the bottom. Water has a density of 10. 3 kg / m 3 Water vapor concentration at 210℃ and 4MPa is 22.1 kg / m³. 3 Under normal circumstances, the density of steam is much lower than that of water, so the condensate produced by steam always stays at the bottom. Theoretically, the conversion between steam and condensate is 1:1, meaning that the amount of steam consumed will produce an equal mass of condensate. The self-resetting level control valve discharges condensate based on the condensate level, discharging only condensate and not steam during the process. This results in very high steam utilization without waste, and efficient steam utilization can reduce energy consumption.

[0054] Taking steam heating in a vulcanizing machine as an example, steam heats the hot plate, producing condensate. The condensate gradually accumulates and remains at the bottom of the hot plate. It flows into the pipe through the outlet and is collected and accumulated in the self-resetting level control valve. The larger the cavity of the self-resetting level control valve, the more condensate is collected. The water vapor inside is above the condensate. When a certain volume is reached, the valve is opened, and the condensate is continuously discharged from the valve outlet. When the condensate level drops to a certain level, the valve closes. Throughout the entire working process, from opening to closing, a certain level of condensate is maintained. The retained condensate has a sealing effect, preventing steam from escaping.

[0055] To improve the reliability of the self-resetting level control valve, the valve is equipped with upper and lower limit level sensors. The upper limit sensor ensures that the heating temperature is not affected if water fails to be discharged due to factors such as jamming, while the lower limit level sensor ensures that steam is not wasted if condensate fails to be discharged due to factors such as jamming. When the upper or lower limit level sensor provides feedback, the control system controls the cylinder to forcibly open or close the valve. The forced control by the cylinder can eliminate abnormalities caused by temporary jamming or back pressure, giving the valve a certain reset effect and improving the reliability of the valve.

[0056] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A self-resetting liquid level control valve, characterized in that, The system includes an intermediate auxiliary plate, on which end cap assemblies and valve bodies are respectively mounted on the upper and lower sides. The intermediate auxiliary plate, end cap assemblies, and valve bodies are secured with screws. The intermediate auxiliary plate and valve body are sealed with O-rings, and the central hole of the intermediate auxiliary plate is sealed with packing material. Liquid will not leak when the valve core assembly moves up and down. The valve is initially normally closed, with liquid flowing into the valve from the inlet. As the liquid level increases to a certain level, the valve opens, and liquid is discharged from the outlet. Valve closure and opening are fed back by proximity switch signals. The valve body contains an upper limit liquid level sensor and a lower limit sensor. If the liquid level is below the lower limit or above the upper limit, and the valve is not closed or open, the controller forces the valve to close or open via a control cylinder assembly. The valve core assembly includes a valve stem, a float, a support pad, a valve core seal, a pressure pad, a washer, and a nut. In the initial state, the valve core assembly closes the valve. At this time, the valve core seal and the valve body center hole are tightly pressed together. The valve stem is equipped with a float. As the liquid level inside the valve continuously rises, the buoyancy of the float continuously increases. When the buoyancy overcomes the pressure of closing the valve, the valve core assembly moves upward rapidly, thereby opening the valve. The valve core assembly moves upward until the spherical surface of the round-headed pin fits against the concave surface of the valve stem. Under the push of the spring force, the round-headed pin locks the valve stem, the valve core assembly stops moving and remains stationary. At this time, the valve remains open and the liquid flows out from the valve outlet. The end cap assembly includes an end cap, a round-headed pin, a spring, and a plug. The four side holes of the end cap are evenly distributed. In terms of structure and function, the plug pushes the spring inside each hole, and the spring pushes the round-headed pin. Under the action of the spring force, the spherical surface of the round-headed pin is radially engaged with the valve stem. The plug can adjust the magnitude of the thrust of the round-headed pin. The greater the thrust, the greater the buoyancy required by the valve core assembly when the valve is open, and vice versa when the valve is closed.

2. The self-resetting liquid level control valve as described in claim 1, characterized in that, When liquid flows out of the valve outlet, the buoyancy decreases, but the valve stem assembly does not immediately move downward to close the valve. As the liquid level decreases, the buoyancy gradually decreases. When the sum of the weight of the valve core assembly and the spring pressure is greater than the sum of the total resistance of the four round pins and the buoyancy, the valve core assembly moves downward to close the valve.

3. The self-resetting liquid level control valve as described in claim 1, characterized in that, The cylinder assembly includes a proximity switch and a proximity switch. A mounting bracket is welded to the plug. The cylinder assembly, proximity switch, and proximity switch are fixed on this mounting bracket. The proximity switch provides feedback on the maximum opening of the valve. When the liquid level reaches the upper limit, the proximity switch provides no feedback signal, and the controller briefly forces the valve to open through the cylinder. When the valve is open, the proximity switch provides feedback that the valve is closed. When the liquid level is below the lower limit, the controller briefly forces the valve to close through the cylinder.

4. The self-resetting liquid level control valve as described in claim 1, characterized in that, The valve body uses a flange connection, and the inner cavity of the valve body is equipped with a lower limit liquid level sensor and an upper limit liquid level sensor.

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