Spring-damped breather valve and method of operation thereof

Abstract

The application provides a spring damping type breather valve and a working method thereof, and relates to the technical field of fluid machinery, which comprises a valve body, an intermediate flange is arranged in the middle of the valve body, the intermediate flange is connected with an oil tank pipeline, a connecting flange is arranged on the upper left and right sides of the valve body, and the connecting flanges are connected with exhaust pipelines; a first cavity is formed above the inside of the valve body, the first cavity is connected with the connecting flanges, an adjusting sleeve, a pressure valve disc, a spring upper disc, a pressure valve disc spring, a guide rod and a pressure valve seat are arranged in the first cavity; the application is mainly used for a ship oil tank breather system, can release or supplement the oil gas pressure in the oil tank, ensures that the oil tank maintains normal pressure, the oil tank is not damaged and the oil tank combustible gas is discharged in time under the conditions of medium injection, transfer and external conditions, and prevents the oil gas from being backfired into the oil tank to cause danger.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, and more particularly to a spring-damped vent valve and its operating method. Background Technology

[0002] With the rapid development of naval equipment technology, the safety requirements for ships' piping systems and accessories are becoming increasingly stringent. When the volume of oil and gas in the fuel tank changes due to the working environment or operating conditions, the pressure of the oil and gas in the tank changes accordingly. The oil and gas are discharged or enter through the venting system to stabilize the pressure inside the tank and prevent damage to the fuel tank due to pressure changes.

[0003] Currently, breather valves or breathing valves are commonly installed in oil tank venting systems for the discharge / inhalation of oil and gas. According to their working principle, breather valves or breathing valves are mainly classified into gravity type, spring type, pilot type and combined type.

[0004] However, existing oil tank pressure stabilization solutions have certain shortcomings, including: 1. Gravity-type structures are prone to frequent tripping under low-flow conditions, failing to quickly establish force balance during dynamic valve opening. When the main seal is a hard seal, friction can generate a large amount of static electricity, posing an explosion risk. 2. The spring stiffness of spring-type structures is difficult to control. Under operating conditions, the valve disc's opening height may not reach the design target, and the springs are prone to corrosion and aging after long-term use. 3. Pilot-operated structures are complex. Compared to gravity and spring-type structures, they offer better valve sealing and faster opening and closing, but their single-valve manufacturing cost is high, limiting their application to storage tanks with high technical requirements. Furthermore, pilot-operated structures do not significantly improve the vibration problem of throttling components. Summary of the Invention

[0005] To address the aforementioned technical problem of frequent valve jumping in existing oil tank pressure stabilization schemes, this invention provides a spring-damped vent valve and its operating method. The invention primarily utilizes a damper at the lower end of the pressure valve disc to provide damping for the disc's movement, applying a force opposite to the direction of motion to prolong the take-off or return-to-seat time and prevent frequent valve jumping.

[0006] The technical means employed in this invention are as follows:

[0007] A spring-damped vent valve includes a valve body, a central flange in the middle of the valve body, the central flange being connected to an oil tank pipeline, and a connecting flange on each of the left and right sides of the upper part of the valve body, the connecting flange being connected to an exhaust pipeline.

[0008] A first cavity is formed at the upper part of the valve body, which is connected to a connecting flange. An adjusting sleeve, a pressure valve disc, an upper spring disc, a pressure valve disc spring, a guide rod, and a pressure valve seat are disposed within the first cavity. The upper end of the valve body is connected to the valve cover. A valve stem and an adjusting sleeve are disposed inside the valve body and the valve cover. The adjusting sleeve is disposed outside the valve stem. The valve body and the valve cover share the medium pressure. The lower part of the adjusting sleeve is connected to the upper spring disc, and the lower part of the upper spring disc is connected to the upper part of the pressure valve disc spring. The lower end of the valve cover is connected to the guide rod, and the lower end of the guide rod is connected to the upper spring disc. A second cotter pin is disposed at the end of the guide rod. The lower surface of the valve stem contacts the upper surface of the pressure valve disc. The pressure valve seat is disposed below the pressure valve disc and forms a sealing pair with the pressure valve disc.

[0009] A second cavity is formed at the lower part of the valve body. The second cavity is connected to the intermediate flange. A vacuum valve seat, a vacuum valve disc, a vacuum valve disc spring, an adjusting shim, a damper, and a split ring are arranged in the second cavity. The lower part of the vacuum valve disc spring is connected to the upper part of the vacuum valve disc. A vacuum valve seat is arranged below the vacuum valve disc and forms a sealing pair with the vacuum valve seat. The lower part of the pressure valve disc is connected to the upper part of the damper through a split ring. A second bushing is arranged on the outer side of the split ring. A shaft retaining ring is arranged at the lower part of the second bushing.

[0010] The lower end of the valve body is connected to the air intake cover, and a filter screen is installed inside the air intake cover, with a stainless steel filter screen on the filter screen.

[0011] Furthermore, the valve body and valve cover are fitted together by a stop, and a gasket is provided at the stop to achieve a soft seal between the valve body and the valve cover.

[0012] Furthermore, the valve stem and the adjusting sleeve are sealed by a first O-ring, the valve cover and the adjusting sleeve are sealed by a second O-ring, and the vacuum valve seat and the valve body are sealed by a third O-ring.

[0013] Furthermore, the top of the valve stem is connected to a pull ring, which is fixed by a hexagonal nut, and the hexagonal nut is connected to a first cotter pin.

[0014] Furthermore, the adjusting sleeve is threadedly connected to the upper disc of the spring, and the adjusting sleeve is used to adjust the pressure valve disc spring; when the adjusting sleeve rotates clockwise, the opening pressure of the pressure valve increases; when the adjusting sleeve rotates counterclockwise, the opening pressure of the pressure valve decreases.

[0015] Furthermore, when the pressure reaches the start-up pressure, the pressure valve disc opens; when the pressure reaches the reseating pressure, the pressure valve disc reseats.

[0016] Furthermore, a second gasket is provided at the connection between the lower end of the valve body and the outer cover of the air intake.

[0017] Furthermore, the pressure valve disc is provided with a sealing groove, and vulcanized rubber is provided in the sealing groove. When the pressure valve disc returns to its seat, the vulcanized rubber is squeezed against the sealing surface of the valve body to form a sealing pressure, thereby achieving pressure valve sealing.

[0018] The vacuum valve seat is provided with a sealing groove, and a third O-ring is assembled in the sealing groove. When the vacuum valve disc returns to its seat, the sealing surface of the vacuum valve disc squeezes the third O-ring until the sealing surface of the vacuum valve disc is in contact with the sealing surface of the vacuum valve seat, so as to achieve a hard seal between the sealing surface of the vacuum valve disc and the sealing surface of the vacuum valve seat and a soft seal between the sealing surface of the vacuum valve disc and the third O-ring.

[0019] The adjusting sleeve is provided with a sealing groove, and a first O-ring is assembled in the sealing groove to achieve a soft seal between the valve stem and the first O-ring and between the valve cover and the first O-ring.

[0020] The present invention also provides a method for operating a spring-damped vent valve, which is based on any of the above-mentioned spring-damped vent valves, including a normal operating condition method and an emergency operating condition method.

[0021] The normal operating procedure includes: injecting oil into the oil tank, increasing the oil and gas pressure inside the tank; when the pressure inside the tank rises to the pressure valve disc's opening pressure, the pressure valve disc opens; when the pressure valve disc gradually opens to the pressure valve disc's force balance position, the rated exhaust condition is reached, i.e., the exhaust volume is met, and the oil and gas are discharged from the connecting flanges on both sides of the valve body; when the oil tank is draining oil, the oil and gas pressure inside the tank decreases to the vacuum condition, at which point the pressure valve disc returns to its seat, and the pressure valve disc and the pressure valve seat sealing surface are squeezed to form a sealing pressure ratio, achieving pressure valve sealing; at the same time, the vacuum valve disc opens; when it gradually opens to the vacuum valve disc's force balance position, the rated intake condition is reached, i.e., the intake volume is met, and the oil and gas enter the oil tank from the valve body's middle flange;

[0022] The emergency operating method includes: when the pressure valve disc or vacuum valve disc cannot jump or reseat normally, the pressure valve disc or vacuum valve disc is jumped or reseated by lifting or pressing the pull ring.

[0023] Furthermore, when the pressure valve disc jumps or reseats, the damper at the lower end of the pressure valve disc provides damping for the movement of the pressure valve disc, providing a force opposite to the direction of movement, extending the jump or reseat time to stabilize the movement of the pressure valve disc and avoid frequent jumps of the pressure valve disc.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. This invention provides a solution for emergency situations: when the pressure valve disc or vacuum valve disc cannot jump or reseat normally, the pressure valve disc or vacuum valve disc can be jumped or reseated by lifting or pressing down the pull ring on the top of the valve.

[0026] 2. Both the pressure valve and vacuum valve of this invention have double sealing, resulting in better sealing performance. When the pressure valve disc and vacuum valve disc return to their seats, the highly elastic vulcanized rubber provides a certain buffering effect, reducing the impact of instantaneous force on the valve seat sealing surface and improving the stress on the valve seat. The highly encapsulating vulcanized rubber can effectively prevent impurities in the flowing medium from damaging the sealing surface during the opening and closing of the valve disc, extending the service life of the sealing surface. At the same time, the pressure valve disc and vacuum valve disc also have a metal sealing surface. When the soft sealing surface wears down to the metal sealing surface or burns out, the metal sealing surface can still provide a sealing effect, improving sealing reliability.

[0027] 3. When the pressure valve disc jumps or reseats, the damper at the lower end of the pressure valve disc provides damping for the movement of the pressure valve disc, providing a force opposite to the direction of movement, prolonging the jump or reseat time, avoiding the pressure and velocity oscillations in the pipe caused by excessively long vent pipe, which would cause the valve disc to change too quickly, affecting the stable movement of the valve disc, and preventing the pressure valve disc from jumping frequently. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a cross-sectional view of the present invention.

[0030] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0031] In the diagram: 1. Valve body; 2. First gasket; 3. Valve cover; 4. First hexagonal head bolt; 5. First O-ring; 6. First screw; 7. First bushing; 8. Second screw; 9. Pull ring; 10. Hexagonal nut; 11. First cotter pin; 12. Valve stem; 13. Adjusting sleeve; 14. Second O-ring; 15. Guide rod; 16. Upper spring plate; 17. Second cotter pin; 18. Pressure valve disc spring; 19. Pressure valve disc; 20. Pressure valve seat; 21. Third O-ring; 22. Inlet cover; 23. Filter screen cover; 24. Stainless steel filter screen; 25. Second hexagonal head bolt; 26. Vacuum valve seat; 27. Vacuum valve disc; 28. Vacuum valve disc spring; 29. ​​Second gasket; 30. Adjusting shim; 31. Shaft retaining ring; 32. Second bushing; 33. Split ring; 34. Hexagonal thin nut; 35. Damper. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0035] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0036] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0037] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0038] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0039] like Figure 1 and 2 As shown, the present invention provides a spring-damped vent valve, including a valve body 1, a middle flange in the middle of the valve body 1, the middle flange being connected to the oil tank pipeline, and a connecting flange on each of the left and right sides of the upper part of the valve body 1, the connecting flange being connected to the exhaust pipeline.

[0040] A first cavity is formed inside the upper part of the valve body 1. The first cavity is connected to the connecting flange. An adjusting sleeve 13, a pressure valve disc 19, a spring upper disc 16, a pressure valve disc spring 18, a guide rod 15, and a pressure valve seat 20 are provided in the first cavity. The upper end of the valve body 1 is connected to the valve cover 3. The valve body 1 and the valve cover 3 are fitted by a stop joint. A first gasket 2 is provided at the stop joint to achieve a soft seal between the valve body 1 and the valve cover 3. The valve body 1 and valve cover 3 are internally provided with a valve stem 12 and an adjusting sleeve 13. The adjusting sleeve 13 is located outside the valve stem 12. The valve body 1 and valve cover 3 share the medium pressure. The lower part of the adjusting sleeve 13 is connected to the upper spring plate 16. The lower part of the upper spring plate 16 is connected to the upper part of the pressure valve disc spring 18. The lower end of the valve cover 3 is connected to the guide rod 15. The lower end of the guide rod 15 is connected to the upper spring plate 16. The end of the guide rod 15 is provided with a second cotter pin 17. The lower surface of the valve stem 12 is in contact with the upper surface of the pressure valve disc 19. The pressure valve seat 20 is located below the pressure valve disc 19 and forms a sealing pair with the pressure valve disc 19.

[0041] A second cavity is formed at the lower part of the valve body 1. The second cavity is connected to the intermediate flange. A vacuum valve seat 26, a vacuum valve disc 27, a vacuum valve disc spring 28, an adjusting shim 30, a damper 35, and a split ring 33 are arranged in the second cavity. The lower part of the vacuum valve disc spring 28 is connected to the upper part of the vacuum valve disc 27. The vacuum valve seat 26 is arranged below the vacuum valve disc 27 and forms a sealing pair with the vacuum valve seat 27. The lower part of the pressure valve disc 19 is connected to the upper part of the damper 35 through the split ring 33. A second bushing 32 is arranged on the outside of the split ring 33. A shaft retaining ring 31 is arranged at the lower part of the second bushing 32.

[0042] The lower end of the valve body 1 is connected to the air inlet cover 22. A filter screen cover 23 is provided inside the air inlet cover 22, and a stainless steel filter screen 24 is provided on the filter screen cover 23.

[0043] The valve stem 12 and the adjusting sleeve 13 are sealed by the first O-ring 5, the valve cover 3 and the adjusting sleeve 13 are sealed by the second O-ring 14, and the vacuum valve seat 26 and the valve body 1 are sealed by the third O-ring 21.

[0044] The top of the valve stem 12 is connected to the pull ring 9, which is fixed by a hexagonal nut 10, which is connected to the first cotter pin 11.

[0045] The adjusting sleeve 13 is threadedly connected to the upper spring disc 16. The adjusting sleeve 13 is used to adjust the pressure valve disc spring 18. When the adjusting sleeve 13 rotates clockwise, the pressure valve opening pressure increases. When the adjusting sleeve 13 rotates counterclockwise, the pressure valve opening pressure decreases.

[0046] In this invention, the stiffness of the pressure valve disc spring 18 and the vacuum valve spring 28 is:

[0047]

[0048] Where h is the valve opening height, and D m P is the diameter of the valve disc sealing surface. dr For the rated discharge pressure, ρ h To determine the valve disc lift coefficient at opening height h, P s To adjust the pressure.

[0049] The assembly relationship of this invention is as follows: The first O-ring 5 and the second O-ring 14 are installed into the sealing groove in the adjusting sleeve 13. Before installation, the first O-ring 5 and the second O-ring 14 should be lubricated. After installation, they should not be twisted or twisted, and the rings should be kept flat. The sealing surfaces of the pressure valve disc 19, pressure valve seat 20, vacuum valve seat 26, and vacuum valve disc 27 are ground. The damper 35 is screwed into the pressure valve disc 19 via threads, and the hexagonal thin nut 34 is tightened to lock the damper 35 and prevent it from falling off. The split ring 33 is inserted into the pressure valve seat 20, so that the piston rod head of the damper 35 is locked in the split ring 33. The second bushing 32 is installed on the pressure valve seat 20 to prevent the split ring 33 from falling off. The shaft retaining ring 31 is locked in the groove of the pressure valve seat 20 to prevent the second bushing 32 from falling off. Install the first bushing 7 into the valve cover 3, drill a hole and thread it at the connection, and tighten it with the second screw 8. Install the adjusting sleeve 13 into the valve cover 3, ream the threaded hole according to the drawing, screw the upper spring plate 16 into the adjusting sleeve 13 and adjust it. Install the guide rod 15 into the valve cover 3 and tighten it. Install the pressure valve seat 20 and the first hexagonal head bolt 4 of the middle flange into the valve body. After installing the valve stem 12 into the valve cover 3 assembly, install the pressure valve disc spring 18 according to the drawing requirements. Install the valve cover 3 assembly, valve stem 12, and pressure valve disc 19 into the valve body 1 and tighten it with the first hexagonal head bolt 4. Install the vacuum valve disc 27, vacuum valve seat 26 (with the third O-ring 21), filter screen cover 23 and stainless steel filter screen 24 in sequence from the bottom of the valve according to the drawing, and tighten them with the second hexagonal head bolt 25. After adjusting the opening pressure of the pressure valve disc 19, tighten the valve cover 3 and adjusting sleeve 13 with hexagonal nut 10.

[0050] The functions of each component in this invention are as follows: The valve body 1 has three flanges, with the middle flange connected to the oil tank pipeline, and the left and right side flanges connected to the exhaust pipeline. During exhaust operation, oil and gas enter through the channel at the middle flange, flow through the channel between the pressure valve disc 19 and the valve body 1, and exit through the channels at the left and right side flanges. A machined threaded blind hole is located at the upper end of the valve body 1 for fastening to the valve cover 3 using a first hexagonal head bolt 4. A machined through hole is located at the lower end of the valve body 1 for fastening to the filter screen 23 using a second hexagonal head bolt 25. The first gasket 2 is pressed by the stop joint between the valve body 1 and the valve cover 3, achieving a soft seal between them. The valve cover 3 is connected to the valve body 1 and shares the medium pressure. The first hexagonal head bolt 4 connects the valve body 1 and the valve cover 3. The first O-ring 5 seals the valve stem 12 and the adjusting sleeve 13. The first screw 6 secures the adjusting sleeve 13 to prevent rotation. The pull ring 9 is used to manually open the valve in emergency situations. Hex nut 10 is used to secure pull ring 9 and prevent it from falling off. First cotter pin 11 is used to prevent hex nut 10 from falling off. Valve stem 12 is used to drive and guide the pressure valve disc 19 to open or reseat. Adjusting sleeve 13 is threadedly connected to upper spring plate 16 and can adjust pressure valve disc spring 18; clockwise rotation increases the opening pressure of the pressure valve, and counterclockwise rotation decreases it. Second O-ring 14 is used for sealing between valve cover 3 and adjusting sleeve 13. Guide rod 15 provides guidance when adjusting pressure valve disc spring 18. Upper spring plate 16 is used to secure pressure valve disc spring 18 and prevent it from deviating. Second cotter pin 17 prevents upper spring plate 16 from exceeding its limit when adjusting pressure valve disc spring 18. Pressure valve disc spring 18 is the main component for adjusting the opening pressure. Pressure valve disc 19 is the main component for releasing pressure and reseating seal; when the pressure reaches the opening pressure, pressure valve disc 19 opens; conversely, when the pressure reaches the reseating pressure, pressure valve disc 19 reseats. The pressure valve seat 20 forms a sealing pair with the pressure valve disc 19 and is fixed inside the valve body 1. The third O-ring 21 seals the valve body 1 with the vacuum valve seat 26. The intake port cover 22 supports the filter screen cover 23 and the pressure valve seat 20. The filter screen cover 23 secures the stainless steel filter screen 24. The stainless steel filter screen 24 is welded to the filter screen cover 23 to prevent dust and foreign matter from entering the valve cavity. The second hexagonal head bolt 25 secures the intake port cover 22 to the valve body 1. The vacuum valve seat 26 forms a sealing pair with the vacuum valve disc 27. The vacuum valve disc 27 opens when the pressure reaches its opening pressure during oil discharge. The vacuum valve disc spring 28 is a key component for adjusting the opening pressure of the vacuum valve disc 27. The first and second gaskets 29 prevent the intake port cover 22 from loosening. Adjusting shim 30 is used to slightly change its thickness, which can adjust the vacuum valve disc spring 28. Increasing the thickness raises the vacuum valve opening pressure, and vice versa. Shaft retaining ring 31 prevents the second bushing 32 from falling off. The second bushing 32 prevents the split ring 33 from falling off. The split ring 33 secures the damper 35. Hexagonal thin nut 34 prevents the damper 35 from rotating.The damper 35 is a key component used to ensure that there is no vibration or hammering under normal operating conditions.

[0051] The present invention also provides a working method for a spring-damped vent valve, which is based on the spring-damped vent valve and includes a normal working condition working method and an emergency working condition working method.

[0052] The normal operating procedure includes: when oil is injected into the oil tank, the oil and gas pressure inside the tank increases. When the pressure inside the tank rises to the pressure valve disc 19's activation pressure, the pressure valve disc 19 activates. As it gradually activates to the force equilibrium position, the rated exhaust condition is reached, i.e., the exhaust volume is met, and the oil and gas are discharged from the exhaust ports on both sides of the valve body 1. Conversely, when oil is discharged from the oil tank, the oil and gas pressure inside the tank decreases to the vacuum condition. At this time, the pressure valve disc 19 re-seated, and the pressure valve disc 19 and the pressure valve seat 20 sealing surfaces are pressed together to form a sealing pressure, achieving pressure valve sealing. Simultaneously, the vacuum valve disc 27 activates. As it gradually activates to the force equilibrium position, the rated intake condition is reached, i.e., the intake volume is met, and the oil and gas enter the oil tank through the intake inlet of the valve body 1.

[0053] The emergency working method includes the following: when the pressure valve disc 19 and vacuum valve disc 27 cannot be opened or reseated normally, the opening or reseating of the pressure valve disc 19 and vacuum valve disc 27 can be achieved by lifting or pressing down the pull ring 9 on the top of the valve.

[0054] When the pressure valve disc 19 jumps or reseats, the damper 35 at the lower end of the pressure valve disc 19 provides motion damping for the pressure valve disc 19, providing a force opposite to the direction of motion, prolonging the jump or reseat time to stabilize the movement of the pressure valve disc 19 and avoid frequent jumping of the pressure valve disc 19.

[0055] The adjustment principle of the present invention is as follows: when the pressure valve disc 19 cannot jump to the position under the rated working condition, the preload of the pressure valve disc 19 spring can be adjusted by rotating the adjusting sleeve 13.

[0056] The sealing principle of the pressure valve of the present invention is as follows: a sealing groove is machined on the pressure valve disc 19, and rubber is vulcanized in the sealing groove. When the pressure valve disc 19 returns to its seat, the vulcanized rubber is squeezed against the sealing surface of the valve body 1 to form a sealing pressure, thereby achieving the sealing of the pressure valve.

[0057] The sealing principle of the vacuum valve of the present invention is as follows: a sealing groove is machined on the vacuum valve seat 26, and an O-ring is assembled in the sealing groove. When the vacuum valve disc 27 returns to its seat, the sealing surface of the vacuum valve disc 27 squeezes the O-ring until the sealing surface of the vacuum valve disc 27 and the sealing surface of the vacuum valve seat 26 are in contact, thus achieving a double seal, including a hard seal between the sealing surface of the vacuum valve disc 27 and the sealing surface of the vacuum valve seat 26 and a soft seal between the sealing surface of the vacuum valve disc 27 and the O-ring.

[0058] The sealing principle of the valve stem 12 of the present invention is as follows: a sealing groove is machined on the adjusting sleeve 13, and a first O-ring 5 is assembled in the sealing groove to achieve a double seal, including a soft seal between the valve stem 12 and the first O-ring 5 and a soft seal between the valve cover 3 and the first O-ring 5.

[0059] The anti-vibration hammer principle of the present invention is as follows: when the pressure valve disc 19 jumps or reseats, the damper 35 at the lower end of the pressure valve disc 19 provides motion damping for the pressure valve disc 19, provides a force opposite to the direction of motion, prolongs the jump or reseat time, avoids the pressure and velocity oscillation in the pipe caused by the excessive length of the vent pipe, which would cause the pressure valve disc 19 to change too quickly, affect the stable movement of the pressure valve disc 19, and prevent the pressure valve disc 19 from jumping frequently.

[0060] The dustproof principle of this invention is as follows: a filter screen cover 23 is installed at the lower end of the valve body 1 to filter impurities in the gas during the air intake process.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A spring-damped breather valve characterized by: Includes a valve body (1), with an intermediate flange in the middle of the valve body (1) connected to the oil tank pipeline, and a connecting flange on each of the left and right sides of the upper part of the valve body (1) connected to the exhaust pipeline. The valve body (1) has a first cavity at its upper interior, which is connected to a connecting flange. The first cavity contains an adjusting sleeve (13), a pressure valve disc (19), a spring plate (16), a pressure valve disc spring (18), a guide rod (15), and a pressure valve seat (20). The upper end of the valve body (1) is connected to the valve cover (3). The valve body (1) and valve cover (3) contain a valve stem (12) and an adjusting sleeve (13). The adjusting sleeve (13) is located outside the valve stem (12). The valve body (1) and valve cover (3) share the load. The lower part of the adjusting sleeve (13) is connected to the upper spring plate (16), the lower part of the upper spring plate (16) is connected to the upper part of the pressure valve plate spring (18), the lower end of the valve cover (3) is connected to the guide rod (15), the lower end of the guide rod (15) is connected to the upper spring plate (16), the end of the guide rod (15) is provided with a second cotter pin (17), the lower surface of the valve rod (12) is in contact with the upper surface of the pressure valve plate (19), and the pressure valve seat (20) is located below the pressure valve plate (19) and forms a sealing pair with the pressure valve plate (19); The valve body (1) has a second cavity at the bottom, which is connected to the intermediate flange. The second cavity is provided with a vacuum valve seat (26), a vacuum valve disc (27), a vacuum valve disc spring (28), an adjusting shim (30), a damper (35), and a split ring (33). The lower part of the vacuum valve disc spring (28) is connected to the upper part of the vacuum valve disc (27). The vacuum valve seat (26) is provided below the vacuum valve disc (27) and forms a sealing pair with the vacuum valve seat (26). The lower part of the pressure valve disc (19) is connected to the upper part of the damper (35) through the split ring (33). A second bushing (32) is provided on the outside of the split ring (33). A shaft retaining ring (31) is provided at the lower part of the second bushing (32). The lower end of the valve body (1) is connected to the air inlet cover (22), and a filter screen cover (23) is provided inside the air inlet cover (22), and a stainless steel filter screen (24) is provided on the filter screen cover (23).

2. The spring-damped breather valve of claim 1, wherein, The valve body (1) and the valve cover (3) are fitted together by a stop, and a gasket (2) is provided at the stop to achieve a soft seal between the valve body (1) and the valve cover (3).

3. The spring-damped breather valve of claim 1, wherein, The valve stem (12) is sealed to the adjusting sleeve (13) by a first O-ring (5), the valve cover (3) is sealed to the adjusting sleeve (13) by a second O-ring (14), and the vacuum valve seat (26) is sealed to the valve body (1) by a third O-ring (21).

4. The spring-damped breather valve of claim 1, wherein, The top of the valve stem (12) is connected to the pull ring (9), which is fixed by a hexagonal nut (10) and connected to the first cotter pin (11).

5. The spring-damped vent valve of claim 1, wherein, The adjusting sleeve (13) is threadedly connected to the upper spring disc (16). The adjusting sleeve (13) is used to adjust the pressure valve disc spring (18). When the adjusting sleeve (13) rotates clockwise, the pressure valve opening pressure increases. When the adjusting sleeve (13) rotates counterclockwise, the pressure valve opening pressure decreases.

6. The spring-damped vent valve of claim 1, wherein, When the pressure reaches the start-up pressure, the pressure valve disc (19) opens; when the pressure reaches the reseating pressure, the pressure valve disc (19) reseats.

7. The spring-damped vent valve according to claim 1, characterized in that, A second gasket (29) is provided at the connection between the lower end of the valve body (1) and the air intake cover (22).

8. The spring-damped vent valve according to claim 1, characterized in that, The pressure valve disc (19) is provided with a sealing groove, and vulcanized rubber is provided in the sealing groove. When the pressure valve disc (19) is reseated, the vulcanized rubber is squeezed against the sealing surface of the valve body (1) to form a sealing pressure, thereby achieving the sealing of the pressure valve. The vacuum valve seat (26) is provided with a sealing groove, and a third O-ring (21) is assembled in the sealing groove. When the vacuum valve disc (27) returns to its seat, the sealing surface of the vacuum valve disc (27) presses the third O-ring (21) until the sealing surface of the vacuum valve disc (27) and the sealing surface of the vacuum valve seat (26) are in contact, so as to achieve a hard seal between the sealing surface of the vacuum valve disc (27) and the sealing surface of the vacuum valve seat (26) and a soft seal between the sealing surface of the vacuum valve disc (27) and the third O-ring (21). The adjusting sleeve (13) is provided with a sealing groove, and a first O-ring (5) is assembled in the sealing groove to achieve a soft seal between the valve stem (12) and the first O-ring (5) and a soft seal between the valve cover (3) and the first O-ring (5).

9. A method for operating a spring-damped vent valve, implemented based on the spring-damped vent valve according to any one of claims 1-8, characterized in that: This includes working methods under normal operating conditions and working methods under emergency operating conditions; The normal operating method includes: injecting oil into the oil tank, increasing the oil and gas pressure in the tank, and when the pressure in the tank rises to the pressure valve disc (19) start-up pressure, the pressure valve disc (19) starts to open. When the pressure valve disc (19) gradually opens to the pressure valve disc (19) force balance position, the rated exhaust condition is reached, that is, the exhaust volume is satisfied, and the oil and gas are discharged from the connecting flanges on both sides of the valve body (1); when the oil tank is drained, the oil and gas pressure in the tank drops to the vacuum condition. At this time, the pressure valve disc (19) returns to its seat, and the pressure valve disc (19) and the pressure valve seat (20) sealing surface are squeezed to form a sealing pressure ratio, realizing the sealing of the pressure valve. At the same time, the vacuum valve disc (27) opens. When it gradually opens to the vacuum valve disc (27) force balance position, the rated intake condition is reached, that is, the intake volume is satisfied, and the oil and gas enter the oil tank from the middle flange of the valve body (1); The emergency working method includes: when the pressure valve disc (19) and vacuum valve disc (27) cannot jump or reseat normally, the pressure valve disc (19) and vacuum valve disc (27) are jumped or reseated by lifting or pressing the pull ring (9).

10. The operating method of the spring-damped vent valve according to claim 9, characterized in that: When the pressure valve disc (19) jumps or reseats, the damper (35) at the lower end of the pressure valve disc (19) provides damping for the movement of the pressure valve disc (19), provides a force opposite to the direction of movement, prolongs the jump or reseat time, so that the pressure valve disc (19) moves stably and avoids frequent jumping of the pressure valve disc (19).

Images