Automatic-adjustment leakproof center line-type butterfly valve

Abstract

A self-adjusting leakproof center line-type butterfly valve comprises a valve body, a valve rod is arranged in the valve body, a butterfly plate is connected to the valve rod, padding is further arranged between the valve rod and the valve body, a padding pressing ring is arranged on the padding, a gasket is arranged on the padding pressing ring, a first gap is formed between the padding pressing ring and the valve body, and a second gap is formed between the padding pressing ring and the gasket. The packing compression ring comprises a first position and a second position, the first position is in a slight compression state when leakage does not occur, and the second position is in a state that medium compresses the packing compression ring downwards, the first gap distance becomes small and the second gap distance becomes large after leakage occurs. In a natural mounting state, slight pre-tightening is realized, at the moment, the contact surface of the filler and the valve rod is only preliminarily pre-tightened, and only a low-pressure sealing effect can be realized; when the main sealing O-shaped ring on the lower portion is seriously damaged, the leakage amount is increased, a leaked medium can push the packing to be compressed, sealing between the packing and the valve rod is achieved, and leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an automatically adjustable anti-leakage centerline butterfly valve. Background Art

[0002] Since the stem seal of the lined butterfly valve generally adopts a pure double O-ring sealing structure, with the aging of the rubber and the switch wear of the O-ring and the stem diameter, as time goes by, the valve will leak at the stem after a few years of use. This leakage cannot be repaired online. The commonly used solution is to replace the O-ring or replace the entire valve. Now a more convenient remedial measure is needed to solve this technical problem. Summary of the invention

[0003] In order to solve the technical defects in the prior art, the utility model provides an automatically adjustable anti-leakage center line butterfly valve.

[0004] The technical solution adopted by the utility model is: an automatically adjusted anti-leakage centerline butterfly valve, comprising a valve body, a valve stem is arranged in the valve body, a butterfly plate is connected to the valve stem, a packing is arranged between the valve stem and the valve body, a packing pressure ring is arranged on the packing, a gasket is arranged on the packing pressure ring, a first gap is formed between the packing pressure ring and the valve body, a second gap is formed between the packing pressure ring and the gasket, the packing pressure ring comprises a first position in which the packing pressure ring is in a slightly compressed state when there is no leakage, and a second position in which the medium compresses the packing pressure ring downward after leakage occurs, the spacing of the first gap becomes smaller, and the spacing of the second gap becomes larger.

[0005] The packing pressure ring is formed with a first step and a second step structure, the first gap is located between the first step and the valve body, and the second gap is located between the second step and the gasket.

[0006] A process hole is also formed in the valve body, and the process hole is located on the side wall of the valve body.

[0007] The gasket is also provided with a gasket pressing ring.

[0008] A first O-ring is arranged between the packing pressure ring and the valve body, between the packing pressure ring and the gasket, and between the gasket and the valve body.

[0009] The first O-ring includes a first state in which it does not contact the medium and bears the medium pressure when there is no leakage, and a second state in which the first O-ring between the packing ring, the valve body and the gasket is deformed under force to achieve sealing after leakage occurs.

[0010] A second O-ring is also provided between the valve stem and the valve body.

[0011] A packing pad is also provided at the bottom of the packing.

[0012] The process hole is connected to the side wall of the valve body above the second O-ring and the packing pressure ring.

[0013] The beneficial effects of the utility model are as follows: the utility model provides an automatically adjustable anti-leakage centerline butterfly valve, including a valve body, a valve stem is arranged in the valve body, a butterfly plate is connected to the valve stem, a packing is further arranged between the valve stem and the valve body, a packing pressure ring is arranged on the packing, a gasket is arranged on the packing pressure ring, a first gap is formed between the packing pressure ring and the valve body, a second gap is formed between the packing pressure ring and the gasket, the packing pressure ring includes a first position in which the packing pressure ring is in a slightly compressed state when there is no leakage and a second position in which the medium compresses the packing pressure ring downward after leakage occurs, the first gap spacing becomes smaller, and the second gap spacing becomes larger, the utility model adds a packing and a packing pressure ring above the original valve stem sealing O-ring, in the natural installation state, it is slightly pre-tightened, at this time, the contact surface between the packing and the valve stem is only pre-tightened, and can only play a role of low-pressure sealing; when the main sealing O-ring below is seriously damaged, the leakage amount increases, and the leakage medium will push the packing to be compressed to achieve the sealing between the packing and the valve stem to avoid external leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the sealing structure of a conventional lined butterfly valve.

[0015] Figure 2 It is a schematic diagram of the structure of the utility model.

[0016] Figure 3 This is a schematic diagram of the low-pressure sealing structure of the utility model.

[0017] Figure 4 It is a schematic diagram of the sealing structure of the utility model when leaking.

[0018] Among them, 1-valve body, 2-valve stem, 3-packing, 4-packing pressure ring, 5-gasket, 6-first gap, 7-second gap, 8-first O-ring, 9-second O-ring, 11-process hole, 31-packing pad, 41-first step, 42-second step, 51-gasket pressure ring. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The automatic adjustment anti-leakage centerline butterfly valve comprises a valve body 1, a valve stem 2 is arranged in the valve body 1, a butterfly plate is connected to the valve stem 2, a packing 3 is arranged between the valve stem 2 and the valve body 1, a packing ring 4 is arranged on the packing 3, a gasket 5 is arranged on the packing ring 4, a first gap 6 is formed between the packing ring 4 and the valve body 1, and a second gap 7 is formed between the packing ring 4 and the gasket 5. The packing ring 4 comprises a first position where the packing ring 4 is in a slightly compressed state when there is no leakage, and a second position where the medium compresses the packing ring 4 downward after leakage, the first gap 6 becomes smaller, and the second gap 7 becomes larger. The packing ring 4 is formed with a first step 41 and a second step 42 structure, the first gap 6 is located between the first step 41 and the valve body 1, and the second gap 7 is located between the second step 42 and the gasket 5. A process hole 11 is also formed in the valve body 1, and the process hole 11 is located on the side wall of the valve body 1. The process hole 11 is connected to the side wall of the valve body 1 above the second O-ring and the packing ring 4. The gasket 5 is also provided with a gasket ring 51. A first O-ring 8 is provided between the packing ring 4 and the valve body 1, between the packing ring 4 and the gasket 5, and between the gasket 5 and the valve body 1. The first O-ring 8 includes a first state in which it does not contact the medium and bears the medium pressure when there is no leakage, and a second state in which the first O-ring 8 between the packing ring 4, the valve body 1 and the gasket 5 is deformed by force to achieve sealing after leakage. In case of slight leakage, the leaking medium cannot push the packing ring to move, but it cannot penetrate the packing seal; when the leakage is large, the second O-ring in contact with the valve stem is completely damaged, and the pressure of the leaking medium is close to the pipeline pressure. The leaking medium preferentially flows to the packing ring position above the packing through the process hole next to it, pushing the packing ring downward to press tightly, and realizing the high-pressure sealing of the packing; in this pressing and sealing process, no manual intervention is required, and the valve can remain leak-free.

[0021] A second O-ring 9 is also provided between the valve stem 2 and the valve body 1 .

[0022] A packing pad 31 is also provided at the bottom of the packing 3 .

[0023] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent.

[0024] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An automatically adjustable anti-leakage centerline butterfly valve, comprising a valve body (1), wherein a valve stem (2) is arranged in the valve body (1), and a butterfly plate is connected to the valve stem (2), wherein: A packing (3) is further provided between the valve stem (2) and the valve body (1), a packing pressure ring (4) is provided on the packing (3), a gasket (5) is provided on the packing pressure ring (4), a first gap (6) is formed between the packing pressure ring (4) and the valve body (1), a second gap (7) is formed between the packing pressure ring (4) and the gasket (5), and the packing pressure ring (4) includes a first position in which the packing pressure ring (4) is in a slightly compressed state when there is no leakage, and a second position in which the medium compresses the packing pressure ring (4) downward after leakage occurs, the spacing of the first gap (6) becomes smaller, and the spacing of the second gap (7) becomes larger.

2. The automatic adjustment and leakage-proof centerline butterfly valve according to claim 1 is characterized in that: A first step (41) and a second step (42) structure are formed on the packing pressure ring (4), the first gap (6) is located between the first step (41) and the valve body (1), and the second gap (7) is located between the second step (42) and the gasket (5).

3. The automatic adjustment and leakage-proof centerline butterfly valve according to claim 2 is characterized in that: A process hole (11) is also formed in the valve body (1), and the process hole (11) is located on the side wall of the valve body (1).

4. The automatic adjustment and leakage-proof centerline butterfly valve according to claim 1 is characterized in that: The gasket (5) is also provided with a gasket pressing ring (51).

5. The automatic adjustment and leakage-proof centerline butterfly valve according to claim 1 is characterized in that: A first O-ring (8) is provided between the packing pressure ring (4) and the valve body (1), between the packing pressure ring (4) and the gasket (5), and between the gasket (5) and the valve body (1).

6. The automatic adjustment anti-leakage centerline butterfly valve according to claim 5 is characterized in that: The first O-ring (8) comprises a first state in which it does not contact the medium and bears the medium pressure when there is no leakage, and a second state in which the first O-ring (8) between the packing pressure ring (4), the valve body (1) and the gasket (5) is deformed under force to achieve sealing after leakage occurs.

7. The automatic adjustment and leakage-proof centerline butterfly valve according to claim 3 is characterized in that: A second O-ring (9) is also provided between the valve stem (2) and the valve body (1).

8. The automatic adjustment and leakage-proof centerline butterfly valve according to claim 1 is characterized in that: A filling pad (31) is also provided at the bottom of the filler (3).

9. The automatically adjustable anti-leakage centerline butterfly valve according to claim 7, characterized in that: The process hole (11) is connected to the side wall of the valve body (1) above the second O-ring and the packing pressure ring (4).

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