Composite exhaust and air inlet valve with high working reliability

Abstract

The combined type exhaust air inlet valve comprises a valve body and a valve cover arranged on an opening in the top of the valve body, a lifting cover is arranged in the valve body below a sealing rubber plate and fixed to the lower end of a guide rod vertically sliding up and down, and a floating ball capable of floating up and down is arranged on the valve body below the lifting cover. The lower end of the guide rod is provided with a channel composed of an axial micropore and a radial micropore, the axial micropore is located above the lifting cover, the channel is communicated with the upper space and the lower space of the lifting cover, the upper surface of the floating ball is provided with a sealing plug opposite to the radial micropore in the lower end of the guide rod, and the floating ball is movably connected with a combined structure formed by the guide rod and the lifting cover through a connecting structure. The combined type high-speed exhaust air inlet valve is structurally improved on the basis of an original combined type high-speed exhaust air inlet valve, the movement reliability of a movable part of the exhaust air inlet valve is improved, the working reliability of the exhaust air inlet valve can be remarkably improved by being matched with an improved structure and a maintenance method, and water supply safety is effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of intake and exhaust valve technology, specifically a composite intake and exhaust valve with high operational reliability. Background Technology

[0002] Composite air intake and exhaust valves for water supply pipelines are typically installed at relatively high points in the pipe network, or at intervals. When the pressure inside the pipeline is lower than the external atmospheric pressure, the valve core actuates, opening the air intake channel to allow air into the pipeline, preventing deformation and damage caused by negative pressure. When the empty pipe is filled with water, the pressure inside the pipeline is higher than the external atmospheric pressure, and the air inside the pipe is discharged through the exhaust channel. Since the intake and exhaust share the same channel, it is called an air intake and exhaust valve. The large amount of air discharged when the empty pipe is filled with water is called the "large exhaust" or "primary exhaust" process. After the primary exhaust is completed, the valve core, mainly composed of a float, rises, the main exhaust channel closes, and the pipeline enters normal operation. However, due to incomplete primary exhaust or natural water release, a small amount of gas may remain in the pipeline. If not discharged in time, this can increase pipeline air resistance, affecting the stability and continuity of water flow, and even causing pressure fluctuations and water hammer. Therefore, the air intake and exhaust valve also needs to have a "micro-exhaust" or "secondary exhaust" function to discharge these small amounts of gas. Because it has both large and micro-exhaust functions, it is also called a "composite air intake and exhaust valve."

[0003] Smooth venting is essential for the successful completion of the water filling process. Therefore, the venting flow rate under a certain internal and external pressure difference is a crucial technical indicator for venting and intake valves. In real-world engineering projects, intake and large-scale venting operations occur only in rare situations, such as when water is shut off and the pipeline is emptied or a pipe burst occurs. When valve core components are in constant contact for extended periods, the long-term effects of scale and even microorganisms can cause adhesion between the sealing surfaces and jamming between moving parts. This severely affects the smoothness of intake and large-scale venting, and may even jeopardize the operational safety of the pipeline network.

[0004] Because the "large exhaust" operating conditions of the exhaust and intake valves are very rare and difficult to simulate online, most users currently rely on visual inspection for maintenance, lacking scientific and effective testing methods and standardized maintenance procedures. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this invention is to provide a composite exhaust and intake valve with high operational reliability.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a composite exhaust and intake valve with high operational reliability, comprising a valve body and a valve cover disposed on the top opening of the valve body. The valve cover has an opening on one side, and the top opening of the valve body is covered by a sealing plate with a central opening. A lifting cover is disposed in the valve body below the sealing plate and fixed to the lower end of a vertically sliding guide rod. A float ball that can float up and down is disposed in the valve body below the lifting cover. A channel composed of axial micro-holes and radial micro-holes is disposed at the lower end of the guide rod, with the outer end of the radial micro-holes located on the lower end face of the guide rod and the axial micro-holes located above the lifting cover, so that the channel connects the upper and lower spaces of the lifting cover. A sealing gasket is disposed on the upper surface of the float ball, which is opposite to the radial micro-holes at the lower end of the guide rod. The float ball is movably connected to the combined structure formed by the guide rod and the lifting cover through a connecting structure.

[0007] Furthermore, the connecting structure is a lifting member, with both ends of the lifting member bent and fixedly connected to the upper surface of the float. A movable through hole is provided in the center of the lifting member, and the annular groove with a smaller diameter at the lower end of the guide rod slides within the movable through hole in the center of the lifting member.

[0008] Furthermore, the connection structure is a short chain, and the outer edge of the upper surface of the float is fixedly connected to the corresponding part of the lifting cover through multiple short chains.

[0009] Furthermore, the guide rod passes through the guide sleeve provided on the valve cover, and the float is located inside the float cover in the valve body, and moves up and down along the float cover.

[0010] Furthermore, the lower end of the valve body is fixed and connected to the short pipe of the main pipeline through the maintenance valve, the upper end of the guide sleeve is covered with a dustproof screw at the connection point with the outside, and a drain and air inlet valve is provided on one side of the bottom of the valve body, with the outer end of the drain and air inlet valve covered with a dustproof cover.

[0011] Furthermore, the upper end of the guide rod is provided with a connecting threaded hole, and also includes a maintenance handle. The maintenance handle consists of a handle rod and a gauge on one side of the handle rod. The gauge is rotatably connected to the handle rod through a pin. The lower end of the handle rod is provided with a threaded post that can be screwed into the connecting threaded hole at the upper end of the guide rod.

[0012] Furthermore, the upper end of the guide rod is fixedly connected to the inner end of the dustproof screw via a long chain, using the long chain instead of the maintenance handle.

[0013] Furthermore, it also includes a high-pressure gas supply system, which includes a high-pressure gas cylinder and a pressure reducing valve. The pressure reducing valve is sealed to the high-pressure gas cylinder through a high-pressure valve. The high-pressure gas cylinder is filled with food-grade high-pressure gas. The outlet of the pressure reducing valve is sealed to a check valve through a gas supply pipe. The check valve is connected to the drain and gas inlet valve through a lock nut to prevent water from flowing back into the gas supply pipe due to misoperation.

[0014] This utility model also includes a maintenance method for a composite exhaust and intake valve with high operational reliability. The specific steps for inspecting the exhaust and intake functions are as follows:

[0015] Step 1: Open the valve well, ensure adequate ventilation, and guarantee that there are no toxic, harmful, or flammable gases, and no risk of infestation by snakes, insects, or other organisms.

[0016] Step 2: Unscrew the dustproof screw and close the inspection valve;

[0017] Step 3: Insert the handle rod into the guide sleeve and rotate it clockwise until the lower end of the stud is fully screwed into the threaded hole at the upper end of the guide rod. At this time, the handle rod should be in its highest working position. If there is no abnormality, the groove should be flush with the upper surface of the guide sleeve or the distance should be within the allowable range, or the lower end of the gauge should be flush with the upper surface of the guide sleeve or the distance should be within the allowable range. If there is too large a deviation, extra attention should be paid in subsequent operations.

[0018] Step 4: Unscrew the dust cover, open the drain and air inlet valve to drain the water inside the valve body. At this time, the float will drive the guide rod and the handle rod to fall together. If there is no abnormality, the middle step end face of the handle rod will be flush with the upper end face of the guide sleeve or the distance will be within the allowable range.

[0019] Step 5: Slide the knurled part of the upper part of the handle up and down several times to ensure smooth movement, no foreign objects or jamming, and that the upper and lower boundaries are consistent with the above. If there is any abnormality, the cause needs to be identified and the fault eliminated, and the intake and exhaust valves may even need to be disassembled and repaired.

[0020] Step 6: Close the drain and air inlet valve, and slowly open the maintenance valve until it is fully open. At this time, the float will move the guide rod and the handle rod upward together until the handle rod groove is flush with the upper end of the guide sleeve or the distance is within the allowable range, or the lower end of the gauge is flush with the upper end of the guide sleeve or the distance is within the allowable range. At this time, confirm that there is no water flowing out from the upper edge of the valve cover.

[0021] Step 7: Unscrew the handle and tighten the dustproof screw. The maintenance and inspection of the exhaust and intake functions are now complete.

[0022] This utility model also includes a maintenance method for a composite exhaust and intake valve with high operational reliability, further verifying the effectiveness of the micro-exhaust function. The specific operating steps are as follows:

[0023] Step 1: Seal and connect the high-pressure gas supply system according to the connection relationship shown in the attached diagram;

[0024] Step 2: Connect the lock nut tightly to the drain and air inlet valve;

[0025] Step 3: Confirm that the pressure reducing valve is in the closed position;

[0026] Step 4: Slowly open the high-pressure valve and observe the reading of the pressure gauge attached to the pressure reducing valve to confirm that the readings of the high and low pressure gauges are normal.

[0027] Step 5: Slowly open the pressure reducing valve and observe the reading of the pressure gauge attached to the pressure reducing valve. Confirm that the reading of the low pressure gauge is slightly higher than the expected pressure in the water supply pipe.

[0028] Step 6: Slowly open the drain and air intake valve. At the same time, confirm by the exhaust sound and feel that airflow is coming out of the micro-holes on the guide rod, which means that the micro-exhaust function is normal.

[0029] Step 7: If no air escapes, slowly increase the outlet pressure of the pressure reducing valve and appropriately increase the opening of the high-pressure valve. If the reading of the low pressure gauge is higher than the maximum possible pressure of the water supply pipe and air cannot be detected in the micro-orifice, it is determined that the micro-venting function is abnormal. The maintenance valve needs to be closed, and the inlet and outlet valves need to be disassembled for repair until the micro-venting function is normal.

[0030] Step 8: After confirming that the micro exhaust function is normal, close the drain and air inlet valve, unscrew the lock nut, and tighten the dust cover on the drain and air inlet valve outlet. The maintenance work is now complete.

[0031] Through the above settings, this utility model improves the structure of the original composite high-speed exhaust and intake valve, enhancing the reliability of the movement of the moving parts of the exhaust and intake valve. Combined with the improved structure and maintenance methods, it can significantly improve the reliability of the exhaust and intake valve and effectively ensure water supply safety. Attached Figure Description

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] Figure 1 This is a schematic diagram of the structure of this utility model;

[0034] Figure 2 This is a schematic diagram of the internal structure of existing technology;

[0035] Figure 3 This is a schematic diagram of the internal three-dimensional structure of the hanging component used in the connection structure of Embodiment 1 of this utility model;

[0036] Figure 4 This is a schematic diagram of the maintenance handle in Embodiment 1 of this utility model;

[0037] Figure 5 This is a schematic diagram of the internal structure of the connection structure using a short chain in Embodiment 1 of this utility model;

[0038] Figure 6 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of Embodiment 1 of this utility model when a long chain is used instead of a maintenance handle. Detailed Implementation Example 1

[0040] like Figure 1-5 As shown in Figure 7, a composite exhaust and intake valve with high operational reliability includes a valve body 01-1 and a valve cover 01-8 disposed on the top opening of the valve body 01-1. The valve cover 01-8 has an opening on one side, and the top opening of the valve body 01-1 is covered by a sealing plate 01-7 with a central opening. A lifting cover 01-6 is disposed inside the valve body 01-1 below the sealing plate 01-7, fixed to the lower end of a vertically sliding guide rod 01-9. A float ball 01-6 that can float up and down is disposed on the valve body 01-1 below the lifting cover 01-6. 1-2, the lower end of the guide rod 01-9 is provided with a channel 01-16 consisting of axial micro-holes and radial micro-holes, and the outer end of the radial micro-hole is located on the lower end face of the guide rod 01-9, while the axial micro-hole is located above the lifting cover 01-6, so that the channel 01-16 connects the upper and lower spaces of the lifting cover 01-6. The upper surface of the float 01-2 is provided with a sealing gasket 01-4, which is opposite to the radial micro-hole at the lower end of the guide rod 01-9. The float 01-2 is movably connected to the combined structure formed by the guide rod 01-9 and the lifting cover 01-6 through a connecting structure.

[0041] Specifically: The connecting structure is a lifting component 01-5, with both ends of the lifting component 01-5 bent and fixedly connected to the upper surface of the float 01-2. The center of the lifting component 01-5 is provided with a movable through hole, and the lower end of the guide rod 01-9 with a smaller diameter annular groove slides inside the movable through hole in the center of the lifting component 01-5; the connecting structure can also be a short chain 01-13, with the outer edge of the upper surface of the float 01-2 fixedly connected to the corresponding part of the lifting cover 01-6 through multiple short chains 01-13.

[0042] The guide rod 01-9 passes through the guide sleeve 01-10 set in the valve cover 01-8. The float 01-2 is located inside the float cover 01-3 in the valve body 01-1 and moves up and down along the float cover 01-3. The upper end of the guide rod 01-9 is provided with a connecting threaded hole 01-18. It also includes a maintenance handle 03. The maintenance handle 03 consists of a handle rod 03-1 and a gauge 03-3 on one side of the handle rod 03-1. The gauge 03-3 is rotatably connected to the handle rod 03-1 through a pin 03-2. The lower end of the handle rod 03-1 is provided with a threaded post that can be screwed into the connecting threaded hole 01-18 at the upper end of the guide rod 01-9. The upper end of the guide rod 01-9 is fixedly connected to the inner end of the dustproof screw 01-11 through a long chain 01-15. The long chain 01-15 is used instead of the maintenance handle. Figure 7 .

[0043] The lower end of valve body 01-1 is fixed and connected to the short pipe 05 of the main pipeline via maintenance valve 04. The upper end of guide sleeve 01-10, which is connected to the outside, is covered with dustproof screw 01-11. A drain and air inlet valve 02-1 is provided on one side of the bottom of valve body 01-1. The outer end of drain and air inlet valve 02-1 is covered with dust cover 02-2. It also includes a high-pressure gas supply system 06, which includes a high-pressure gas cylinder 06-1 and a pressure reducing valve 06-3. The pressure reducing valve 06-3 is sealed to the high-pressure gas cylinder 06-1 via a high-pressure valve 06-2. The high-pressure gas cylinder 06-1 is filled with food-grade high-pressure gas. The outlet of pressure reducing valve 06-3 is sealed to a check valve 06-5 via a gas supply pipe 06-4. The check valve 06-5 is connected to the drain and air inlet valve 02-1 via a lock nut 06-6 to prevent water from flowing back into the gas supply pipe 06-4 due to misoperation.

[0044] Working principle of this embodiment:

[0045] During production, the lifting cover 01-6 and guide rod 01-9 are welded together, and the lifting component 01-5 and float ball 01-2 are welded together. During on-site installation, the air inlet and outlet valve 01 and maintenance valve 04 are sealed to the short pipe 05, and the external thread of one end of the drain and air inlet valve 02 is sealed to the internal thread of the valve hole 01-12 on the valve body 01-1. During normal operation, the maintenance valve 04 is fully open, the drain and air inlet valve 02 is closed, the dustproof screw 01-11 is tightened in the thread on the upper end of the guide sleeve 01-10, and the maintenance handle 03 and high-pressure air supply system 06 do not participate in the normal operation process.

[0046] When the main pipe is empty, the float 01-2, the lifting cover 01-6, and the guide rod 01-9 fall to their lowest positions under gravity. The sealing pair formed between the lifting cover 06 and the sealing plate 01-7 disengages, and the main water supply pipe is connected to the outside. During the filling process, as water flows into the pipe, the air in the pipe is compressed and discharged through the channel formed by the valve body 01-1, the float cover 01-3, the lifting cover 01-6, the sealing plate 01-7, and the valve cover 01-8 under the action of pressure difference. The process of releasing air into the atmosphere is called "large exhaust" or "single exhaust". When there is negative pressure in the pipe, the positions of the above-mentioned components remain unchanged. The outside air is drawn into the main pipe under the action of pressure difference, which is called the "air intake" process. After the water in the pipe fills the pipe and enters the valve body 01-1, the float ball 01-2 rises under the action of buoyancy, pushing the lifting cover 01-6 and the guide rod 01-9 to rise together until the lifting cover 01-6 and the sealing plate 01-7 are stuck together, preventing water and air from passing through. At this point, the "large exhaust" process ends.

[0047] During normal operation, a small amount of gas that is not discharged during the large exhaust process or gas released during operation accumulates at a relatively high point in the pipeline, which is the preferred installation position of the air intake and exhaust valve. However, at this time, because it is under normal water supply pressure, the pressure of the gas in the upper part is also the water supply pressure. The lifting cover 01-6 will still be tightly fitted under the sealing plate 01-7, and the gas will not escape through the sealing pair between the lifting cover 01-6 and the sealing plate 01-7. As more gas accumulates in the upper part of the valve body 01-1, it causes the water level in it to drop. The float ball 01-2, due to the reduced buoyancy, moves with the water. The lowering of the float causes the sealing gasket 01-4 to descend, causing it to detach from the end face of the guide rod 01-9. Under the action of the pressure difference, the high-pressure gas inside the valve body 01-1 is discharged into the atmosphere through the channel formed by the axial and radial micro-holes in the lower section of the guide rod 01-9. As the accumulated air is discharged, the gas volume decreases and the water level rises. The float rises and causes the sealing gasket 01-4 to rise, tightly fitting against the end face of the guide rod 01-9, thus sealing off the internal water and air from escaping. This is one cycle of "micro-venting" or "secondary venting".

[0048] If scale or microbial contamination causes the sealing pair between the lifting cover 01-6 and the sealing plate 01-7 to stick, or if the moving pair between the guide rod 01-9 and the guide sleeve 01-10 to jam, or if impurities in the water obstruct the descent of the float 01-2, the aforementioned air passages will become blocked, hindering the large exhaust or intake functions and weakening the overall exhaust and intake valve system, potentially even causing safety accidents. (See attached...) Figure 2 As shown, there is no mechanical connection between the existing exhaust and intake valve float ball 01-2 and sealing gasket 01-4 and the lifting cover 01-06. This means that when the pipe is empty, the lifting cover 01-6 falls off by its own weight and separates from the sealing plate 01-7, which results in relatively low reliability of its operation.

[0049] Appendix Figure 3This is a schematic diagram of the valve core components involved in this utility model. The lower circumferential part of the guide rod 01-9 has an annular groove, meaning its diameter is reduced at one end. Correspondingly, the hanger 01-5 is an inverted U-shaped bent plate, welded directly above the float 01-2. A U-shaped notch (i.e., a movable perforation) is opened above the bent plate. During factory assembly, the notch is aligned with the lower annular groove of the guide rod 01-9 and inserted laterally. This ensures that the lower end face of the guide rod 01-9 and the sealing gasket 01-4 can form a reliable seal in the vertical direction, while also limiting the separation distance after a certain period of contact. When the pipeline changes from a full water supply to an empty pipe state... The guide rod 01-9 and the lifting cover 01-6 no longer rely solely on their own gravity to descend and detach from the sealing plate 01-7, which may cause them to stick. Instead, after the float 01-2 and the lifting component 01-5 descend a certain distance, the U-shaped notch of the lifting component 01-5 contacts the side of the lower annular groove of the guide rod 01-9, causing the guide rod 01-9 and the lifting cover 01-6 to descend together. Since the weight of the float 01-2 is much greater than that of the composite of the lifting cover 01-6 and the guide rod 01-9, the separation action between the lifting cover 01-6 and the sealing plate 01-7 is more reliable, thus improving the reliability of large exhaust and intake conditions. Example 2

[0050] like Figure 1 , 6 The maintenance method for a highly reliable composite exhaust and intake valve is shown below. The specific steps for checking the exhaust and intake functions are as follows:

[0051] Step 1: Open the valve well, ensure adequate ventilation, and guarantee that there are no toxic, harmful, or flammable gases, and no risk of infestation by snakes, insects, or other organisms.

[0052] Step 2: Unscrew dustproof screws 01-11 and close inspection valve 04;

[0053] Step 3: Insert the handle rod 03-1 into the guide sleeve 01-10 and rotate it clockwise until the lower end of the stud 03-4 is fully screwed into the threaded hole at the upper end of the guide rod 01-9. At this time, the handle rod 03-1 should be in its highest working position. If there is no abnormality, the groove should be flush with the upper surface of the guide sleeve 01-10 or the distance should be within the allowable range, or the lower end of the gauge 03-3 should be flush with the upper surface of the guide sleeve 01-10 or the distance should be within the allowable range. If there is too large a deviation, extra attention should be paid in subsequent operations.

[0054] Step 4: Unscrew the dust cover 02-2, open the drain and air inlet valve 02-1, and drain the water inside the valve body 01-1. At this time, the float ball 01-2 will drive the guide rod 01-9 and the handle rod 03-1 to fall together. If there is no abnormality, the middle step end face of the handle rod 03-1 will be flush with the upper end face of the guide sleeve 01-10 or the distance will be within the allowable range.

[0055] Step 5: Hold the handle stick 03-1 and slide the knurled part up and down repeatedly several times to confirm that the movement is smooth, there is no foreign object stuck, and the upper and lower boundaries are consistent with the above. If there is any abnormality, the cause needs to be identified and the fault eliminated, and even the intake and exhaust valves need to be disassembled and repaired.

[0056] Step 6: Close the drain and air inlet valve 02, and slowly open the maintenance valve 04 until it is fully open. At this time, the float 01-2 will move the guide rod 01-9 and the handle rod 03-1 upward together until the groove of the handle rod 03-1 is flush with the upper surface of the guide sleeve 01-10 or the distance is within the allowable range, or the lower end of the gauge 03-3 is flush with the upper surface of the guide sleeve 01-10 or the distance is within the allowable range. At this time, confirm that there is no water flowing out from the upper edge of the valve cover 01-8.

[0057] Step 7: Unscrew handle 03-1 and tighten dustproof screw 01-11. The maintenance and inspection of the large exhaust and intake functions are now complete.

[0058] It should be noted that for some exhaust intake valves with separate large and small exhaust structures, such as those attached... Figure 6 (Left) Its float and guide rod are directly fixedly connected without a lifting cover. The original structure does not have an opening in the top cover, so dustproof screw 01-11 is not needed. The alternative solution is to add a threaded hole to the top cover and use maintenance screw 01-14, as shown in the attached diagram. Figure 6 (right). Example 3

[0059] like Figure 1 The following is a maintenance method for a highly reliable composite exhaust and intake valve, which further verifies the effectiveness of the micro-exhaust function. The specific operating steps are as follows:

[0060] Step 1: Install the high-pressure gas supply system 06 according to the attached... Figure 1 Sealed connection;

[0061] Step 2: Tightly connect lock nut 06-6 to drain and air inlet valve 02-1;

[0062] Step 3: Confirm that the pressure reducing valve 06-3 is in the closed position;

[0063] Step 4: Slowly open the high-pressure valve 06-2 and observe the pressure gauge reading attached to the pressure reducing valve 06-3 to confirm that the high and low pressure gauge readings are normal.

[0064] Step 5: Slowly open the pressure reducing valve 06-3 and observe the reading of the pressure gauge attached to the pressure reducing valve 06-3. Confirm that the reading of the low pressure gauge is slightly higher than the expected pressure in the water supply pipe.

[0065] Step 6: Slowly open the drain and air inlet valve 02-1. At the same time, confirm by the exhaust sound and feel that air is being discharged from the micro-hole on the guide rod 01-9, which means that the micro-exhaust function is normal.

[0066] Step 7: If no air escapes, slowly increase the outlet pressure of the pressure reducing valve 06-3 and appropriately increase the opening of the high pressure valve 06-2. If the reading of the low pressure gauge is higher than the maximum possible pressure of the water supply pipe and air cannot be detected in the micro-orifice, it is determined that the micro-venting function is abnormal. The maintenance valve 04 needs to be closed, and the inlet and outlet valves need to be disassembled for repair until the micro-venting function is normal.

[0067] Step 8: After confirming that the micro exhaust function is normal, close the drain and air inlet valve 02-1, unscrew the lock nut 06-6, and tighten the dust cover 02-2 onto the outlet of the drain and air inlet valve 02-1. The maintenance work is now complete.

[0068] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A composite exhaust and intake valve with high operational reliability, comprising a valve body (01-1) and a valve cover (01-8) disposed on the top opening of the valve body (01-1), wherein the valve cover (01-8) has an opening on one side, and the top opening of the valve body (01-1) is covered by a sealing rubber plate (01-7) with a central opening, characterized in that: A lifting cover (01-6) is installed inside the valve body (01-1) below the sealing plate (01-7), which is fixed to the lower end of the vertically sliding guide rod (01-9). A float ball (01-2) that can float up and down is installed inside the valve body (01-1) below the lifting cover (01-6). The float ball (01-2) is located inside the float cover (01-3) inside the valve body (01-1) and moves up and down along the float cover (01-3). The float ball (01-2) is movably connected to the combined structure formed by the guide rod (01-9) and the lifting cover (01-6) through the connecting structure.

2. The composite exhaust and intake valve with high operational reliability as described in claim 1, characterized in that: The lower end of the guide rod (01-9) is provided with a channel (01-16) consisting of axial micro-holes and radial micro-holes, and the upper surface of the float (01-2) is provided with a sealing gasket (01-4) which is opposite to the radial micro-holes at the lower end of the guide rod (01-9).

3. The composite exhaust and intake valve with high operational reliability as described in claim 1, characterized in that: The connecting structure is a hanger (01-5). The two ends of the hanger (01-5) are bent and fixedly connected to the upper surface of the float (01-2). The center of the hanger (01-5) is provided with a movable through hole. The lower end of the guide rod (01-9) with a smaller diameter annular groove slides in the movable through hole in the center of the hanger (01-5).

4. A composite exhaust and intake valve with high operational reliability as described in claim 1, characterized in that: The connection structure is a short chain (01-13). The outer edge of the upper surface of the float (01-2) is fixedly connected to the corresponding part of the lifting cover (01-6) through multiple short chains (01-13).

5. A composite exhaust and intake valve with high operational reliability as described in claim 1, characterized in that: The guide rod (01-9) passes through the guide sleeve (01-10) set in the valve cover (01-8). The outer end of the radial micro-hole is located on the lower end face of the guide rod (01-9), and the axial micro-hole is located above the lifting cover (01-6), so that the channel (01-16) connects the upper and lower spaces of the lifting cover (01-6).

6. A composite exhaust and intake valve with high operational reliability as described in claim 5, characterized in that: The lower end of the valve body (01-1) is fixed and connected to the short pipe (05) of the main pipeline through the maintenance valve (04). The upper end of the guide sleeve (01-10) is covered with a dustproof screw (01-11) at the part that connects to the outside. A drain and air inlet valve (02-1) is provided on one side of the bottom of the valve body (01-1). The outer end of the drain and air inlet valve (02-1) is covered with a dustproof cover (02-2).

7. A composite exhaust and intake valve with high operational reliability as described in claim 6, characterized in that: The upper end of the guide rod (01-9) is provided with a connecting threaded hole (01-18), and also includes a maintenance handle (03). The maintenance handle (03) consists of a handle rod (03-1) and a gauge (03-3) on one side of the handle rod (03-1). The gauge (03-3) is rotatably connected to the handle rod (03-1) through a pin (03-2). The lower end of the handle rod (03-1) is provided with a threaded post that can be screwed into the connecting threaded hole (01-18) at the upper end of the guide rod (01-9).

8. A composite exhaust and intake valve with high operational reliability as described in claim 7, characterized in that: The upper end of the guide rod (01-9) is fixedly connected to the inner end of the dustproof screw (01-11) via a long chain (01-15), and the long chain (01-15) is used instead of the maintenance handle.

9. A composite exhaust and intake valve with high operational reliability as described in claim 6, characterized in that: It also includes a high-pressure gas supply system (06), which includes a high-pressure gas cylinder (06-1) and a pressure reducing valve (06-3). The pressure reducing valve (06-3) is sealed to the high-pressure gas cylinder (06-1) through a high-pressure valve (06-2). The high-pressure gas cylinder (06-1) is filled with food-grade high-pressure gas. The outlet of the pressure reducing valve (06-3) is sealed to a check valve (06-5) through a gas supply pipe (06-4). The check valve (06-5) is connected to the drain and inlet valve (02-1) through a lock nut (06-6) to prevent water from flowing back into the gas supply pipe 06-4 due to misoperation.

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