Pneumatic cushioning angle seat valve

Abstract

The present invention provides a pneumatic buffer angle seat valve, which belongs to the field of valve technology. It solves the problem that the existing pneumatic angle seat valve cannot accurately control the flow rate. The present invention includes a valve core assembly that can control the opening and closing of the valve body by sliding, and a cylinder body connected to the valve core assembly. The cylinder body has an inner cavity one, and the inner cavity one is provided with a piston one for driving the valve core assembly to slide. The cylinder body also has an inner cavity two, and the inner cavity two is slidably provided with a piston two. A push rod fixedly connected to the piston two is passed through the piston two. The upper end of the push rod passes through the top wall of the inner cavity two and extends out of the cylinder body and is provided with a limiter for adjusting the maximum stroke of the piston two. The lower end of the push rod extends into the inner cavity one and can abut against the upper end face of the piston one. An air inlet hole is also provided on the inner cavity two side wall on the upper side of the piston two. The present invention can realize the precise adjustment of the opening height of the valve core assembly to control the flow rate in the valve body.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves and relates to an angle seat valve, in particular to a pneumatic buffer angle seat valve. Background Art

[0002] Pneumatic angle seat valves are widely used and are often found in industries such as papermaking, printing and dyeing, environmental water treatment, beer and beverages, and pharmaceuticals. Existing pneumatic angle seat valves have a relatively simple structure, typically consisting of a stop valve and a cylinder. The cylinder is equipped with a piston that forms a circumferential seal with the inner wall of the cylinder. The piston divides the cylinder's internal cavity into two sealed upper and lower chambers. A spring is typically installed between the upper end face of the piston and the top wall of the upper chamber. Under the action of the spring, the piston always tends to move toward the lower chamber. The valve stem on the stop valve extends into the lower chamber and is fixed to the lower end of the piston. This is done by the spring force, which drives the piston downward, and the stop valve is normally closed under the action of the valve stem. An air inlet is provided on the side wall of the lower chamber to inflate the lower chamber. This inflates the lower chamber, overcoming the spring force and opening the stop valve.

[0003] The pneumatic angle seat valve described above is the most common type on the market. When inflating the lower chamber, the amount of gas entering is not controlled; instead, a large amount of gas is instantly introduced, opening the valve. Consequently, these valves often have only two states: normally open and normally closed, and are unable to precisely control the flow rate within the valve. Improvements have been made to pneumatic angle seat valves, such as the pneumatic two-position, two-way, piston-type, multi-media, cushioned angle seat valve described in Application No. 200810201418.3. While this valve features air inlets in the upper and lower chambers of the piston, these valves still cannot precisely control the piston's travel distance, thereby controlling the valve core's travel distance and thus precisely regulating the flow rate within the valve. Therefore, addressing these issues is an urgent task. Summary of the Invention

[0004] The present invention aims to solve the above-mentioned problems in the prior art and proposes a pneumatic buffer angle seat valve, which solves the technical problem that the prior art pneumatic angle seat valve cannot accurately control the flow rate.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The pneumatic buffer angle seat valve includes a valve core assembly that can open and close the valve body by sliding control and a cylinder body connected to the valve core assembly. The cylinder body has an inner cavity one, and the inner cavity one is provided with a piston one for driving the valve core assembly to slide. It is characterized in that the cylinder body also has an inner cavity two, and a piston two is slidably provided in the inner cavity two. A push rod fixedly connected to the piston two is passed through the piston two. The upper end of the push rod passes through the top wall of the inner cavity two and extends out of the cylinder body and is provided with a limit piece for adjusting the maximum stroke of the piston two. The lower end of the push rod extends into the inner cavity one and can abut against the upper end face of the piston one. An air inlet hole is also provided on the side wall of the inner cavity two on the upper side of the piston two.

[0007] The valve body of this product is controlled by the valve core assembly. The principle is that the valve body has a water hole connecting the water outlet and water inlet, and the valve core assembly rests on the water hole to seal. When the valve core assembly slides upward and away from the water hole, the valve body opens. The valve core assembly is driven up and down by piston 1 within the cylinder body. The cylinder body contains inner chamber 1 and inner chamber 2. Inner chamber 1 is located below inner chamber 2, and piston 1 is located within inner chamber 1. The upper end of the valve core assembly is fixed to the lower end face of piston 1. Piston 1 slides relative to inner chamber 1, driving the valve core assembly up and down, thereby controlling the opening and closing of the valve body. Movement of piston 1 toward the top wall of inner chamber 1 opens the valve body to maximum flow. A piston 2 is provided in the inner chamber 2, and a push rod is passed through the piston 2. The piston 2 slides up and down relative to the inner chamber 2 to drive the push rod to slide together. The lower end of the push rod is located in the inner chamber 1 and abuts against the upper end surface of the piston 1 when the valve body is opened to the maximum extent. The upper end of the push rod extends out of the upper end surface of the cylinder body. A limiter is provided on the portion of the push rod exposed outside the cylinder body. The distance between the limiter and the upper end surface of the cylinder body is adjustable. After adjustment, the piston 2 drives the push rod downward by inflating the air inlet hole on the inner chamber 2 side wall above the piston 2. Due to the setting of the limiter, the displacement distance of the push rod is the distance between the limiter and the upper end surface of the cylinder body. At the same time, the piston 1 also drives the valve core assembly to move the same distance. This setting makes the opening height of the valve core assembly controllable and the opening height of the valve core assembly can be accurately adjusted by simply adjusting the distance between the limiter and the upper end surface of the cylinder body.

[0008] The stopper, ejector rod, and piston 2 are interlocked, so their displacement distances are identical. When the valve body opens to maximum flow, piston 1 also moves to its maximum distance. Due to the inlet pressure, the ejector rod is driven by piston 2, which presses against the upper end face of piston 1 and drives piston 1 toward the bottom wall of chamber 1, tending to close the valve body. Therefore, adjusting the distance between the stopper and the upper end face of the cylinder body during this interlocking process effectively controls the distance of piston 1's movement. The valve body's opening is related to the opening and closing height of the spool assembly, which in turn is related to the distance piston 1 moves toward the top wall of chamber 1. This distance between piston 1 and the top wall is actually controlled by the ejector rod. Inflating the inlet pressure causes piston 2 to slide downward, driving the ejector rod downward. The ejector rod's movement distance is, in turn, controlled by the stopper on the ejector rod, which is exposed outside the cylinder body. Therefore, by adjusting the distance between the stopper and the upper end face of the cylinder body, the valve body's opening height can be precisely adjusted, thereby controlling the flow rate within the angle seat valve.

[0009] In the above-mentioned pneumatic buffer angle seat valve, the second top wall of the inner cavity is the lower end surface of a detachable upper cover, and a cylindrical protrusion is provided on the lower end surface of the upper cover, and a stopper is provided on the upper end surface of the upper cover and is coaxial with the protrusion. A positioning hole is provided on the stopper that passes through the stopper and the protrusion, and the upper end of the push rod is exposed outside through the positioning hole. A resist portion is also provided on the upper end of the second piston. When the upper end surface of the piston abuts against the lower end surface of the push rod, the upper end surface of the resist portion abuts against the lower end surface of the protrusion.

[0010] When the upper end face of piston 1 abuts against the lower end face of push rod, the upper end face of the blocking part abuts against the lower end face of the protrusion. The setting of the protrusion and the blocking part is equivalent to playing a returning role. Since when the valve body is in the closed state, the push rod and piston 1 are not fixedly connected, but the push rod and piston 2 are fixedly connected, and piston 2 is movably set in the inner cavity 2, so when the push rod needs to be used to adjust the height of the valve core assembly, the initial position of the push rod will change. A reference is required to adjust the actual required flow rate, otherwise the adjustment distance of the limiter at the upper end of the push rod may have an error. When the valve body is at the maximum flow rate, piston 1 abuts against the lower end face of the push rod and the push rod protrusion abuts against the blocking part, so that the part of the upper end of the push rod exposed outside the cylinder reaches the maximum value, which is equivalent to playing the role of a scale. After each adjustment, the push rod is in this state when the valve body is opened to the maximum flow next time. This setting further improves the accuracy of our adjustment of the flow rate in the valve body.

[0011] In the above-mentioned pneumatic buffer angle seat valve, the push rod includes a rod body and a connecting head exposed outside the upper end surface of the upper cover, and the limiting member is arranged on the connecting head.

[0012] In the above-mentioned pneumatic buffer angle seat valve, the limit member is a nut threadedly connected to the connecting head, and the nut can slide relative to the connecting head through circumferential rotation and the lower end surface of the nut can abut against the upper end surface of the stop block.

[0013] When the valve body is opened and reaches the maximum flow rate, the distance between the nut and the stopper is adjusted by turning the nut. In this way, when the push rod moves downward, the movement of the push rod will stop when the lower end face of the nut abuts against the upper end face of the stopper. This setting is simple, convenient and practical to operate, and has high adjustment accuracy.

[0014] In the above-mentioned pneumatic buffer angle seat valve, a plurality of annular grooves are evenly formed on the outer peripheral surface of the connector, and the limiting member is a retaining ring detachably arranged in the annular groove, and the lower end surface of the retaining ring can abut against the upper end surface of the stop block.

[0015] This is another technical solution for the limiter. The limiter is a retaining ring. Since there are multiple ring grooves and the distances between the retaining ring and the block are different, the retaining ring can be disassembled and installed in different ring grooves to adjust the distance between the retaining ring and the block, thereby limiting its movement distance when the push rod slides downward.

[0016] In the above-mentioned pneumatic buffer angle seat valve, the inner cavity 1 includes an upper cavity portion and a lower cavity portion with a diameter larger than that of the upper cavity portion. The piston 1 is located in the lower cavity portion and can slide relative to the upper cavity portion. When the piston 1 moves to the uppermost end of the lower cavity portion, the lower end surface of the push rod abuts against the piston 1.

[0017] Since the lower cavity is larger than the upper cavity, a circumferential seal is formed between piston 1 and the side wall of the lower cavity, so piston 1 cannot move into the upper cavity. This arrangement can further limit the range of motion of piston 1, preventing the instantaneous impact of piston 1 from being too large due to excessive inflation, which may cause the upper cover at the upper end of the ejector rod to loosen and affect the sealing of inner cavity 2.

[0018] In the above-mentioned pneumatic buffer angle seat valve, a stop joint is provided on the upper end surface of the piston 1, and when the piston 1 moves to the uppermost end of the lower cavity, the lower end surface of the push rod abuts against the upper end surface of the stop joint.

[0019] When the valve body reaches the maximum flow rate, piston 1 abuts against the upper side wall of the lower cavity. At this time, there is still a distance between the upper end face of piston 1 and the lower end face of the push rod. The abutment with the upper end face of piston 1 could be achieved by adjusting the position of the push rod. However, if the lower end of the push rod extends excessively into the inner cavity 1, the push rod exposed in the inner cavity 1 will be longer, and the stability will be poor and it will be easily damaged under the instantaneous impact of piston 1. Therefore, an extended stop joint is provided on the upper end face of piston 1 to make up for the lack of this section, so that the fit between piston 1 and the push rod is better.

[0020] In the above-mentioned pneumatic buffer angle seat valve, a spring seat is provided on the top wall of the inner cavity one, a guide hole penetrating the spring seat is opened on the spring seat, and the lower end of the push rod extends into the inner cavity one through the guide hole.

[0021] Since the length of the ejector rod is relatively long during actual use, a guide hole is required to limit its radial position to prevent the ejector rod or cylinder body from being damaged due to excessive instantaneous impact of pneumatic opening and closing, thereby improving the safety and stability of this product.

[0022] In the above-mentioned pneumatic buffer angle seat valve, a spring is further provided between the top wall of the inner cavity and the upper end face of the piston. The upper end of the spring surrounds the outside of the spring seat, and the lower end of the spring surrounds the outside of the stop joint. The piston always maintains a tendency to slide downward under the action of the spring elastic force.

[0023] Another function of the spring seat and the stop joint is to make the installation of the spring more stable. The setting of the spring makes it possible for the piston to always push the valve core assembly to keep the valve body in a closed state when the cylinder body is not inflated.

[0024] Compared with the existing technology, the advantages of this product are: this product is linked by the push rod and piston one, and the displacement distance of the two is the same, so by adjusting the distance between the limiter and the stop block set at the upper end of the push rod, the movement distance of the piston one can be precisely regulated during the linkage process, and the opening and closing of the valve body is controlled by the valve core assembly, and the valve core assembly is linked with piston one, so this product can achieve precise adjustment of the opening height of the valve core assembly to achieve the effect of controlling the flow in the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 It is a half-section schematic diagram of the present invention.

[0027] In the figure, 1. valve body; 2. valve core assembly; 3. cylinder body; 31. inner cavity 1; 311. upper cavity; 312. lower cavity; 32. inner cavity 2; 33. air inlet; 34. spring seat; 341. guide hole; 4. piston 1; 41. stop joint; 5. piston 2; 51. stop part; 6. push rod; 61. connector; 62. rod body; 7. limiter; 8. upper cover; 81. bump; 82. stop block; 83. positioning hole; 9. spring. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0029] Example 1

[0030] like Figure 1 and Figure 2The pneumatically operated angle seat valve shown in FIG. comprises a valve body 1 with a water inlet on the left and a water outlet on the right. A water passage connecting the inlet and outlet is provided within the valve body 1. A mounting end is provided on the side of the valve body 1, which is inclined. The mounting end houses a valve core assembly 2 that abuts against the water passage to close it. The valve core assembly 2 comprises a valve core and a valve stem. The valve core assembly 2 also includes a conical sealing gasket fixed to the lower end surface of the valve core. The sealing gasket abuts against the opening of the water passage to enhance sealing. Due to the high impact force generated when the valve core is pneumatically opened and closed, the conical sealing gasket forms a recess that mates with the water passage, enhancing sealing. A valve seat is also connected to the mounting end. A bushing assembly is located within the valve seat. The valve stem extends through the bushing assembly, with the upper end of the valve stem protruding from the bushing. The bushing assembly ensures smoother sliding of the valve stem relative to the valve seat and improves the seal between the valve stem and the valve seat. The bushing assembly includes an upper bushing and a lower bushing, and the double bushing further enhances the sealing effect. The pneumatic cushioning angle seat valve also includes a cylinder body 3 connected to the valve stem. The cylinder body 3 includes an annular cylindrical body and an upper cover 8 and a lower cover detachably connected to the upper and lower ends of the body. The upper cover 8, the lower cover, and the body together form a larger inner cavity. The upper cover 8 is located inside the upper end of the body, forming a circumferential seal with the inner wall of the body and is fixed in place by a retaining spring. The lower cover is located inside the lower end of the body, also forming a circumferential seal with the inner wall of the body and is also fixed in place by a retaining spring. A protrusion is provided on the side wall of the inner cavity, which divides the inner cavity into two approximately identical inner cavities, cavity 1 31 and cavity 2 32. Inner cavity 2 32 is located above cavity 1 31. A movable piston 1 4 is provided in cavity 1 31. The upper end of the valve stem passes through the bottom wall of cavity 1 31 and is fixed to the lower end face of piston 1 4. A spring 9 is installed between piston 4 and the top wall of cavity 31. The spring's force causes piston 4 to move toward the bottom wall of cavity 31, causing the valve core to rest against the water hole, closing valve body 1. An air inlet, connected to an air pump, is also located on the inner wall of cavity 31 below piston 4. Inflating cavity 31 below piston 4 causes piston 4 to overcome the spring's force and move toward the top wall of cavity 31, thereby lifting the valve core and opening the water hole. Inner chamber 1 31 comprises an upper chamber 311 and a lower chamber 312, which has a larger diameter than upper chamber 311. Piston 1 4 is located within lower chamber 312 and can slide relative to upper chamber 311. Because lower chamber 312 is larger than upper chamber 311, a circumferential seal is formed between piston 1 4 and the sidewalls of lower chamber 312, preventing piston 1 4 from moving into upper chamber 311. This arrangement limits the range of motion of piston 1 4. Piston 2 5 is also located within inner chamber 2 32, dividing inner chamber 2 32 into an upper chamber and a lower chamber. As piston 2 5 slides, either the upper or lower chamber may disappear while the other reaches its maximum size. Piston 2 5 is also provided with a push rod 6, which drives push rod 6 along with it as it slides up and down.The lower end of the push rod 6 extends through the protrusion into the inner cavity 31. A stopper is also provided on the upper end surface of the piston. As the piston 4 moves toward the top wall of the inner cavity 31 to its maximum displacement, the upper end surface of the stopper abuts against the lower end surface of the push rod 6. This abutment between the upper end surface of the stopper and the lower end surface of the push rod 6 provides a smoother and more stable contact. The push rod 6 comprises a shaft 62 and a connector 61 exposed on the upper end surface of the upper cover 8. A nut is attached to the connector 61. The nut is rotatable and can slide up and down relative to the connector 61 through rotation. An air inlet 33 that can be connected to an air pump is provided on the inner wall of the upper chamber. When piston 14 moves to the maximum displacement distance and abuts against the lower end surface of the push rod 6, the upper chamber is inflated so that piston 25 drives the push rod 6 to move toward the lower chamber, and piston 14 is pressed against the bottom wall of the inner chamber 31. The valve core will also move toward the water hole due to the movement of piston 14, so that the flow in the valve body gradually decreases from the maximum state. However, since a nut is threadedly connected to the connector 61, it can limit the excessive movement of the push rod 6. The flow control is achieved by adjusting the distance between the valve core and the water hole through the limit of the nut.

[0031] The lower end surface of the upper cover 8 of this product is provided with a cylindrical protrusion 81. A stopper 82 is also provided on the upper end surface of the upper cover 8, coaxially arranged with the protrusion 81. A positioning hole 83 is formed in the stopper 82, extending through both the stopper 82 and the protrusion 81. The upper end of the ejector pin 6 is exposed through the mounting hole. A stopper 51 is also provided on the upper end of the piston 5. When the upper end surface of the piston 1 4 abuts the lower end surface of the ejector pin 6, the upper end surface of the stopper 51 abuts against the lower end surface of the protrusion 81. The protrusion 81 and the stopper 51 serve as a limit. Since the piston 1 4 does not contact the lower end surface of the ejector pin 6 when the valve body 1 is closed, the upper end of the piston 1 4 abuts against the ejector pin 6 when the piston 1 4 reaches its maximum displacement. The ejector pin 6 then slides with the piston 2 5 relative to the inner chamber 2 32. Therefore, the displacement of the piston 2 5 toward the upper chamber needs to be limited, serving as a reference. The portion of the upper end of push rod 6 exposed outside cylinder body 3 is equipped with a nut for adjusting the length of push rod 6. The nut's function is to pre-adjust the distance between the nut and the stopper 82 before inflating the upper chamber. After adjustment, the upper chamber is inflated, and piston 2 5 drives push rod 6 toward the lower chamber. At this time, the exposed upper end of push rod 6 gradually extends into the upper chamber. When it moves to the pre-adjusted position, the nut comes into contact with the stopper 82, and push rod 6, piston 2 5, and piston 1 4 all stop moving due to the contact between the nut and the stopper 82. Because push rod 6, piston 2 5, and piston 1 4 are linked, they move the same distance. Therefore, adjusting the distance between the nut and the upper end surface of cylinder body 3 is equivalent to precisely controlling the movement distance of piston 1 4 during this linkage process. The valve stem is connected to the lower end of piston 1 4, and the distance between the valve core and the water hole is controlled by piston 1 4. The movement distance of piston 1 4 toward the top wall of inner cavity 1 31 is actually controlled by push rod 6. By inflating the air inlet 33, piston 2 5 slides downward to drive push rod 6 to move downward. The movement distance of push rod 6 is adjusted and controlled by the nut on push rod 6 exposed outside cylinder body 3. Therefore, this product can achieve precise adjustment of the valve core opening height of valve body 1 to control the flow rate in valve body 1. This product has two nuts and they are in contact with each other. The advantage of this setting is that the limiting strength is further improved, preventing the push rod 6 from loosening due to excessive instantaneous impact caused by excessive pressure in inner cavity 1 31. The two nuts in contact with each other can further improve the accuracy of adjustment.

[0032] The convex portion is also provided with a guide block, which has a guide hole 341 extending through the guide block and the convex portion. The lower end of the push rod 6 extends through the guide hole 341 into the inner cavity 1 31. Because the push rod 6 is relatively long in actual use, the guide hole 341 is required to limit its radial position to prevent it from tilting due to the excessive force of the pneumatic opening and closing, which could damage the push rod 6 or the cylinder body 3. This improves the safety and stability of this product.

[0033] Example 2

[0034] This embodiment has essentially the same structure and principles as the first embodiment, differing in that: in this embodiment, a plurality of annular grooves are uniformly formed on the outer circumference of the connector 61, and the limiting member 7 is a retaining ring removably disposed within the annular grooves, the lower end of which can abut against the upper end of the stopper 82. Because the retaining ring 7 has multiple annular grooves and the distances between the retaining ring and the stopper 82 vary, the retaining ring can be removed and installed in different annular grooves to adjust the distance between the retaining ring and the stopper 82, thereby limiting the travel distance of the push rod 6 as it slides downward. This provides the same technical effect as a nut threaded onto the connector 61.

[0035] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. A pneumatic cushioning angle seat valve, comprising a valve core assembly (2) capable of controlling the opening and closing of a valve body (1) and a cylinder body (3) connected to the valve core assembly (2), wherein the cylinder body (3) has an inner cavity (31), and a piston (4) is provided in the inner cavity (31) for driving the valve core assembly (2) to slide, wherein: The cylinder body (3) further comprises an inner cavity (32), a piston (5) being slidably disposed in the inner cavity (32), a push rod (6) being inserted into the piston (5) and being fixedly connected to the piston (5), the upper end of the push rod (6) passing through the top wall of the inner cavity (32) and extending out of the cylinder body (3), and a stopper (7) for adjusting the maximum stroke of the piston (5) being disposed on the push rod (6), the lower end of the push rod (6) extending into the inner cavity (31) and being able to abut against the upper end surface of the piston (4), an air inlet hole (33) being provided on the side wall of the inner cavity (32) on the upper side of the piston (5), and the top wall of the inner cavity (32) being A lower end surface of a detachable upper cover (8), wherein a cylindrical protrusion (81) is provided on the lower end surface of the upper cover (8), a stopper (82) coaxially arranged with the protrusion (81) is provided on the upper end surface of the upper cover (8), a positioning hole (83) penetrating the stopper (82) and the protrusion (81) is opened on the stopper (82), the upper end of the push rod (6) passes through the positioning hole (83) and is exposed outside, and a stopper (51) is further provided on the upper end of the piston 2 (5), and when the upper end surface of the piston 1 (4) abuts against the lower end surface of the push rod (6), the upper end surface of the stopper (51) abuts against the lower end surface of the protrusion (81).

2. The pneumatic cushioning angle seat valve according to claim 1, characterized in that: The top rod (6) comprises a rod body (62) and a connecting head (61) exposed outside the upper end surface of the upper cover (8), and the limiting member (7) is arranged on the connecting head (61).

3. The pneumatic cushioning angle seat valve according to claim 2, characterized in that: The limiting member (7) is a nut threadedly connected to the connecting head (61); the nut can slide relative to the connecting head (61) through circumferential rotation and the lower end surface of the nut can abut against the upper end surface of the stopper (82).

4. The pneumatic cushioning angle seat valve according to claim 2, characterized in that: A plurality of annular grooves are evenly formed on the outer circumferential surface of the connector (61); the limiting member (7) is a retaining ring detachably disposed in the annular groove; the lower end surface of the retaining ring can abut against the upper end surface of the stopper (82).

5. The pneumatic cushioning angle seat valve according to any one of claims 1 to 4, characterized in that: The inner cavity one (31) comprises an upper cavity part (311) and a lower cavity part (312) having a larger diameter than the upper cavity part (311); the piston one (4) is located in the lower cavity part (312) and can slide relative to the upper cavity part (311); when the piston one (4) moves to the uppermost end of the lower cavity part (312), the lower end surface of the push rod (6) abuts against the piston one (4).

6. The pneumatic cushioning angle seat valve according to claim 5, characterized in that: A stop joint (41) is provided on the upper end surface of the piston one (4), and when the piston one (4) moves to the uppermost end of the lower chamber (312), the lower end surface of the push rod (6) abuts against the upper end surface of the stop joint (41).

7. The pneumatic cushioning angle seat valve according to claim 6, characterized in that: A spring seat (34) is provided on the top wall of the inner cavity one (31), and a guide hole (341) penetrating the spring seat (34) is provided on the spring seat (34), and the lower end of the push rod (6) passes through the guide hole (341) and extends into the inner cavity one (31).

8. The pneumatic cushioning angle seat valve according to claim 7, characterized in that: A spring (9) is further provided between the top wall of the inner cavity (31) and the upper end surface of the piston (4); the upper end of the spring (9) surrounds the outer side of the spring seat (34), and the lower end of the spring (9) surrounds the outer side of the stop joint (41); the piston (4) always maintains a tendency to slide downward under the action of the elastic force of the spring (9).

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