Upper seat type anti-leakage valve

Abstract

The utility model belongs to the field of control valves, and particularly relates to an upper seat type anti-leakage valve which comprises a valve body, a valve cover, a valve core, a valve rod, a valve seat and a corrugated pipe component, the corrugated pipe control valve solves the problem of leakage control of toxic, highly corrosive, volatile and other special media, guarantees personal safety of a production site, protects the environment from being polluted, and meanwhile, the corrugated pipe of the corrugated pipe control valve is of an upper seat type structure, so that the corrugated pipe control valve is convenient to use. According to the static sealing structure, a medium is isolated in the containing cavity between the corrugated pipe and the valve cover, the outside of the corrugated pipe is subjected to pressure from the medium, the pressure bearing mode is an external pressure mode, compared with an internal pressure mode, the corrugated pipe adopts the pressure bearing mode, the action service life is prolonged, the service time is longer, the service life of the corrugated pipe control valve is correspondingly prolonged, and the service life of the corrugated pipe control valve is prolonged. The maintenance and replacement period of the control valve by a user is prolonged, the efficiency is improved, and the cost is reduced.

Description

Technical Field

[0001] The utility model relates to the field of control valves, in particular to an upper seat type anti-leakage valve. Background Art

[0002] For control valves used in ordinary working conditions, the seal at the valve stem, a key component, is a dynamic seal, and generally uses molded packing made of PTFE or graphite (high temperature). This packing sealing structure is only suitable for ordinary media that are non-toxic, non-corrosive, and non-volatile (such as water, steam, slurry, etc.). Since the packing is a wearing part, it rubs against the valve stem during use, and will wear and loosen over time, and the medium will inevitably leak out of the valve stem. Under ordinary working conditions, the packing can be reinforced or replaced online. However, under some special working conditions, such as the control of highly toxic, volatile and rare media, the sealing requirements at the valve stem are extremely stringent, and no leakage is allowed, let alone online maintenance of the packing. The aforementioned ordinary packing dynamic sealing structure cannot meet the requirements of such working conditions. Therefore, those skilled in the art have provided an upper seat anti-leakage valve to solve the problems raised in the above background technology. Utility Model Content

[0003] In order to make up for the deficiencies of the prior art, the utility model proposes an upper seat type anti-leakage valve.

[0004] The technical solution adopted by the utility model to solve its technical problems is: an upper seat anti-leakage valve, including a valve body, a valve cover, a valve core, a valve stem, a valve seat, a bellows component, a guide ring and a stuffing box, a valve cover is provided on the top of the valve body, a bellows component is inserted into the interior of the valve cover, a valve stem is inserted into the interior of the bellows component, a valve core is threadedly connected to the bottom of the valve stem, a pin is inserted into the interior of the valve core and the valve stem, the interior of the valve body is threadedly connected to the valve seat, and the bottom of the valve core passes through the interior of the valve seat.

[0005] Preferably, the bellows component includes a bellows inserted into the inside of the valve cover, a bellows upper ring fixedly installed at the step on the top of the valve cover, and a bellows lower ring fixedly welded to the bottom of the valve stem. The bellows lower ring and the bellows upper ring are respectively welded to the bellows to form a bellows component. The bellows lower ring is welded to the bottom of the valve stem, and the bellows upper ring is fixedly placed in the step groove formed by the valve cover and the stuffing box.

[0006] Preferably, a second sealing ring is provided at the top and bottom of the bellows upper ring, and the bellows upper ring and the second sealing ring are located in a groove where the upper end of the valve cover is connected to the stuffing box.

[0007] Preferably, a stuffing box is provided on the top of the valve cover and located on the outside of the valve stem, an upper connecting flange is provided on the outside of the stuffing box, and a lower connecting flange is provided on the top of the valve cover. The upper connecting flange and the lower connecting flange are fixedly connected by a first bolt.

[0008] Preferably, the stuffing box is provided with packing and a packing gland inside, and a pressure plate is provided on the top of the stuffing box, and the pressure plate is fixedly connected to the stuffing box by a second bolt.

[0009] Preferably, a guide ring is provided inside the valve body, and the guide ring is located in the groove of the valve body and the valve cover. A first sealing ring is provided on the upper and lower surfaces of the guide ring, and the valve body and the valve cover are tightly connected by a third bolt.

[0010] The utility model is beneficial in that:

[0011] The present invention greatly expands the application field of the control valve, solves the problem of leakage control of special media such as toxic, highly corrosive, and volatile media, ensures the personal safety of people at the production site, and protects the environment from pollution. At the same time, the bellows control valve designed by the present invention has a bellows of "upper seat type" (fixed upper end) structure, which isolates the medium in the static sealing cavity between the bellows and the valve cover without entering the dynamic sealing cavity of the stuffing box, and the outside of the bellows is subjected to pressure from the medium. This pressure mode is "external pressure type". Compared with the "internal pressure type" (fixed lower end of the bellows), the bellows adopts this pressure mode, which increases the action life and the service life, and correspondingly increases the service life of the bellows control valve. The user's maintenance and replacement cycle of the control valve is extended, which not only improves efficiency but also reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0013] Figure 1 It is a structural diagram of the utility model;

[0014] Figure 2 This is a schematic diagram of the bellows component and valve cover structure of the utility model;

[0015] Figure 3 This is a schematic diagram of the bellows component, valve core and valve stem structure of the utility model;

[0016] Figure 4 This is a schematic diagram of the bellows component and valve stem structure of the utility model;

[0017] Figure 5 This is a schematic diagram of the structure of the bellows component of the present utility model.

[0018] In the figure: 1. Valve body; 2. Valve cover; 3. Valve seat; 4. Guide ring; 5. Valve core; 6. Bellows component; 7. Stuffing box; 8. Valve stem; 9. First bolt; 10. Second bolt; 11. Pressure plate; 12. Upper connecting flange; 13. Lower connecting flange; 14. First sealing ring; 15. Third bolt; 16. Pin; 17. Bellows lower ring; 18. Bellows; 19. Bellows upper ring; 20. Second sealing ring. DETAILED DESCRIPTION

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

[0020] The following is combined with Figure 1-5 To further explain this application,

[0021] The embodiment of the present application discloses an upper seat type anti-leakage valve. Figure 1 and Figure 2 , an upper-seat anti-leakage valve comprises a valve body 1, a valve cover 2, a valve core 5, a valve stem 8, a valve seat 3, a bellows component 6, a guide ring 4 and a stuffing box 7. A valve cover 2 is provided on the top of the valve body 1, a bellows component 6 is inserted into the interior of the valve cover 2, a valve stem 8 is inserted into the interior of the bellows component 6, a valve core 5 is threadedly connected to the bottom of the valve stem 8, a pin 16 is inserted into the interior of the valve core 5 and the valve stem 8, the interior of the valve body 1 is threadedly connected to the valve seat 3, and the bottom of the valve core 5 passes through the interior of the valve seat 3.

[0022] Reference Figure 2 and Figure 3 The bellows component 6 includes a bellows 18 inserted into the inside of the valve cover 2, a bellows upper ring 19 fixedly installed at the step on the top of the valve cover, and a bellows lower ring 17 fixedly welded to the bottom of the valve stem. The bellows lower ring 17 and the bellows upper ring 19 are respectively welded to the bellows to form a bellows component. The bellows lower ring is welded to the bottom of the valve stem to prevent the medium from flowing from here to the dynamic sealing cavity of the stuffing box. The bellows upper ring is fixedly placed in the step groove formed by the valve cover and the stuffing box.

[0023] Reference Figure 4 and Figure 5 A second sealing ring 20 is provided at the top and bottom of the bellows upper ring 19. The bellows upper ring 19 and the second sealing ring 20 are located in the groove between the upper end of the valve cover 2 and the stuffing box 7 to form a static seal to prevent the medium from leaking.

[0024] Reference Figure 1 and Figure 2 A stuffing box 7 is provided on the top of the valve cover 2 and located on the outside of the valve stem 8. An upper connecting flange 12 is provided on the outside of the stuffing box 7. A lower connecting flange 13 is provided on the top of the valve cover 2. The upper connecting flange 12 and the lower connecting flange 13 are fixedly connected by a first bolt 9.

[0025] Reference Figure 1 and Figure 2 The stuffing box 7 is provided with packing and a packing gland inside, and a pressure plate 11 is provided on the top of the stuffing box 7. The pressure plate 11 is fixedly connected to the stuffing box 7 by a second bolt 10.

[0026] Reference Figure 2 and Figure 3 A guide ring 4 is provided inside the valve body 1. The guide ring 4 is located in the groove of the valve body 1 and the valve cover 2. A first sealing ring 14 is provided on the upper and lower surfaces of the guide ring 4. The valve body 1 and the valve cover 2 are tightly connected by a third bolt 15. The setting of the first sealing ring 14 ensures that the medium does not leak from between the valve body 1 and the valve cover 2.

[0027] Working principle: Since the bellows upper ring 19 of the bellows component 6 is fixed between the valve cover 2 and the stuffing box 7, the bellows lower ring 17 is welded to the valve stem 8. When the valve stem 8 moves up and down, the bellows 18 and the bellows lower ring 17 are driven to produce corresponding displacements at the same time, realizing the adjustment function of the control valve. The sealing structure of the entire bellows component 6 ensures that when the valve stem 8 moves up and down in the inner cavity of the valve body 1, the driven medium can only enter the cavity between the bellows component 6 and the valve cover 2. As before, this cavity is determined by the design structure and is leak-proof.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention as claimed.

Claims

1. Upper seat anti-leakage valve, characterized by: The valve body (1) comprises a valve cover (2), a valve core (5), a valve stem (8), a valve seat (3), a bellows component (6), a guide ring (4) and a stuffing box (7), wherein the valve body (1) is provided with a valve cover (2) on the top, the valve cover (2) is provided with a bellows component (6) inserted in the interior, the bellows component (6) is plugged with a valve stem (8), the bottom of the valve stem (8) is threadedly connected to the valve core (5), the interior of the valve core (5) and the valve stem (8) are plugged with a pin (16), the interior of the valve body (1) is threadedly connected to the valve seat (3), The bottom of the valve core (5) passes through the interior of the valve seat (3), and the bellows component (6) includes a bellows (18) inserted into the interior of the valve cover (2), a bellows upper ring (19) fixedly installed at the top step of the valve cover (2), and a bellows lower ring (17) fixedly welded to the bottom of the valve stem (8). The bellows lower ring (17) and the bellows upper ring (19) are respectively welded to the bellows (18) to form a bellows component. The bellows lower ring (17) is welded to the bottom of the valve stem (8), and the bellows upper ring (19) is fixedly placed between the valve cover (2) and the bottom of the valve stem (8). In the step groove formed by the stuffing box (7), the top and bottom of the bellows upper ring (19) are both provided with a second sealing ring (20), the bellows upper ring (19) and the second sealing ring (20) are located in the groove connected to the stuffing box (7) at the upper end of the valve cover (2), the top of the valve cover (2) and the outer side of the valve stem (8) are provided with a stuffing box (7), the outer side of the stuffing box (7) is provided with an upper connecting flange (12), the top of the valve cover (2) is provided with a lower connecting flange (13), and the upper connecting flange (12) and the lower connecting flange (13) are provided. The valve body (1) and the valve cover (2) are fixedly connected by a first bolt (9), the stuffing box (7) is provided with a stuffing and a stuffing gland inside, the top of the stuffing box (7) is provided with a pressure plate (11), and the pressure plate (11) is fixedly connected to the stuffing box (7) by a second bolt (10), the valve body (1) is provided with a guide ring (4), the guide ring (4) is located in the groove of the valve body (1) and the valve cover (2), the upper and lower surfaces of the guide ring (4) are both provided with a first sealing ring (14), and the valve body (1) and the valve cover (2) are tightly connected by a third bolt (15).

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