Double-pressing-plate combined type sealing plug valve

Abstract

The utility model belongs to the technical field of valves, and relates to a double-pressing-plate combined type sealing plug valve which comprises a valve body, the upper end of a middle cavity of the valve body is connected with an upper cover in a sealing mode, a plug cock and a lining are installed in the middle cavity of the valve body, the lining is placed in the valve body in the radial direction of the middle cavity of the valve body, and the plug cock is pressed on the lining. A plug rod at the upper part of the plug cock extends out of the upper cover; a first O-shaped ring and a packing group are sequentially arranged at a packing box of the upper cover from bottom to top, and the packing group is pressed and limited through a packing pressing plate; the cock is pressed and limited through the adjusting pressing plate, and the sealing specific pressure of the cock can be adjusted. According to the plug valve, double-pressing-plate type double redundancy sealing is adopted, the adjusting pressing plate and the packing pressing plate respectively press the plug cock and the packing set, double sealing is achieved, and the leakage risk is solved. The spiral-wound gasket and the O-shaped ring are installed between the valve body and the upper cover at the same time, when one sealing piece loses efficacy, the other sealing piece can achieve the sealing effect, and the leakage risk is effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to valve technical field relates to a double pressure plate combination formula sealed plug valve. BACKGROUND

[0002] With the rapid development demand of salt chemical industry, silicon chemical industry, tail gas treatment, pry dress and other industries in our country, it is more and more urgent to develop the reliable performance plug valve that meets the working condition requirement.Currently, the soft sealing plug valve on the market generally has the problem of external leakage, and the product quality is extremely unstable, which causes serious loss to the environment, personnel and equipment.Once the valve fails, the device is forced to stop running in order to maintain or replace the valve, which causes unnecessary economic loss and time waste. SUMMARY

[0003] The utility model provides a double pressure plate combination formula sealed plug valve for the above problem, the plug valve adopts double pressure plate formula double redundancy sealing, and the adjusting pressure plate and the packing pressure plate are respectively pressed tightly to the plug and the packing group, double sealing, and the external leakage risk is solved.The winding gasket and the O-shaped ring are installed between the upper cover of the valve body at the same time, and when one of the sealing members fails, the other sealing member can realize the sealing effect, thereby effectively reducing the external leakage risk.The stud at the adjusting pressure plate is locked by two locking nuts at the same time, thereby effectively solving the problem that the stud is loose and the plug is moved upward, thereby causing the main sealing surface to leak due to the long-time operation of the valve and the vibration of the equipment.

[0004] According to the technical scheme of the utility model: a double pressure plate combination formula sealed plug valve, characterized by: including the valve body, the upper end of the middle cavity of the valve body is sealingly connected with the upper cover, the middle cavity of the valve body is provided with a plug and a bushing, wherein the bushing is arranged in the valve body along the radial direction of the middle cavity of the valve body, the plug is pressed tightly on the bushing, and the plug rod of the upper part of the plug extends from the upper cover;

[0005] The packing gland of the upper cover is sequentially provided with a first O-shaped ring and a packing group from bottom to top, and the packing group is pressed tightly and limited by the packing pressure plate.

[0006] The plug is pressed tightly and limited by the adjusting pressure plate, and the sealing specific pressure of the plug can be adjusted.

[0007] As a further improvement of the utility model, the upper cover and the valve body are tightly connected by bolts, and a winding gasket and a second O-shaped ring are arranged between the upper cover and the valve body, wherein the winding gasket is arranged in the inner ring of the second O-shaped ring.

[0008] As a further improvement of the utility model, the adjusting pressing plate is locked on the upper cover by the first stud, the first locking nut and the second locking nut, wherein the first stud is screwed on the adjusting pressing plate, the lower end of the first stud is screwed on the connecting column of the upper cover, the second locking nut is screwed on the first stud and is screwed on the top surface of the connecting column of the upper cover, and the first locking nut is screwed on the first stud and is screwed on the upper surface of the adjusting pressing plate.

[0009] As a further improvement of the utility model, the packing pressing plate is locked and fixed on the upper cover by the second stud.

[0010] As a further improvement of the utility model, the arc-shaped part of the bottom surface of the packing pressing plate is pressed on the arc-shaped surface at the upper end of the packing group.

[0011] As a further improvement of the utility model, the lower end of the tap is pressed on the inner wall of the conical cavity of the bushing.

[0012] As a further improvement of the utility model, the outer surfaces of the upper end and the lower end of the bushing are both provided with clamping grooves, and each clamping groove is clamped on the corresponding annular protruding part in the inner cavity of the valve body.

[0013] The technical effect of the utility model lies in that the adjusting pressing plate of the utility model is pressed on the tap by screwing the first locking nut, the sealing specific pressure of the tap and the bushing is adjusted on line to realize sealing, which is the first sealing; the first O-shaped ring is arranged below the packing group to prevent the sealing of the first O-shaped ring in the case of failure of the first sealing, which is the second sealing; in the case of failure of the first sealing and the second sealing, the packing group is pressed by adjusting the packing pressing plate to achieve the purpose of sealing, which not only prevents medium leakage but also plays a fireproof role, which is the third sealing. The adjusting pressing plate and the packing pressing plate press the tap and the packing group respectively, the structure is a double-pressing-plate combined sealing, and the risk of external leakage is effectively solved.

[0014] The stud used in the adjusting pressing plate of the utility model is locked by the first locking nut and the second locking nut at the same time, the risk of leakage at the sealing surface of the tap caused by loosening of the stud under long-time operation of the valve is solved, and the reliability of the bushing sealing is ensured.

[0015] The upper cover packing chamber of the utility model is provided with the packing group and the first O-shaped ring at the same time, the first O-shaped ring plays a sealing role in the case of failure of the main sealing; in the case of failure of the main sealing and the first O-shaped ring, the packing group can also be used for sealing and playing a fireproof role, and the redundant sealing structure solves the risk of leakage of the medium from the upper cover.

[0016] The valve body and the upper cover are provided with a winding gasket and a second O-shaped ring, the second O-shaped ring between the valve body and the upper cover can play a sealing role in the case of main sealing failure, and the winding gasket can be used for sealing and playing a fireproof role in the case that both the main sealing and the second O-shaped ring fail, so that the risk of medium leakage from the valve body and the upper cover is solved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a valve structure schematic diagram of the utility model.

[0018] Figure 2 It is a partial enlarged view of the double-pressing plate structure of the utility model.

[0019] Figure 3 It is a partial enlarged view of the packing gland of the upper cover.

[0020] Figure 4 It is a partial enlarged view of the connection between the upper cover and the valve body.

[0021] Figure 5 It is a structure schematic diagram of the bushing.

[0022] Figure 6 It is a perspective view of the utility model. DETAILED DESCRIPTION

[0023] The specific embodiments of the utility model will be further described below in combination with the drawings.

[0024] In order to make the person skilled in the art better understand the utility model scheme, the technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0025] Figures 1-6 In the embodiment, including stud 1, first locking nut 2a, second locking nut 2b, gasket 3, adjusting pressing plate 4, plug 5, packing pressing plate 6, packing group 7, upper cover 8, first O-shaped ring 9, valve body 10, winding gasket 11, second O-shaped ring 12, bushing 13 and the like.

[0026] As Figures 1-6As shown, the utility model relates to a kind of double compression plate combined type sealing plug valve, including valve body 10, the upper end sealing connection upper cover 8 of the middle cavity of valve body 10, plug 5 and bushing 13 are installed in the middle cavity of valve body 10, wherein the bushing 13 is put into valve body 10 along the radial direction of the middle cavity of valve body 10, plug 5 is pressed on the bushing 13, and the plug rod of the upper portion of plug 5 extends from upper cover 8.

[0027] First O-ring 9, packing group 7 are sequentially arranged from bottom to top at the packing chamber of upper cover 8, and the packing group 7 is pressed and positioned by packing compression plate 6. By installing first O-ring 9 and packing group 7 at the packing chamber of upper cover 8 respectively, double sealing is realized to reduce the risk of external leakage.

[0028] Plug 5 is pressed and positioned by adjusting plate 4, and the sealing specific pressure of plug 5 can be adjusted. In specific production practice, the adjustment structure of the sealing specific pressure of plug 5 is as follows: adjusting plate 4 is locked above upper cover 8 by first stud 1, first locking nut 2a and second locking nut 2b, wherein the lower end of first stud 1 is threadedly connected with the connecting column of upper cover 8 after penetrating through adjusting plate 4, second locking nut 2b is threadedly connected on first stud 1 and tightened on the top surface of the connecting column of upper cover 8, and first locking nut 2a is threadedly connected on first stud 1 and tightened on the upper surface of adjusting plate 4. By the above structure, the risk of external leakage of plug valve can be effectively reduced, and first locking nut 2a and second locking nut 2b can effectively prevent plug 5 from moving upward due to loosening of first stud 1, thereby preventing the sealing surface from leaking.

[0029] Upper cover 8 and valve body 10 are connected by bolt fastening, and winding gasket 11 and second O-ring 12 are arranged between upper cover 8 and valve body 10, wherein winding gasket 11 is arranged in the inner ring of second O-ring 12. Winding gasket 11 and second O-ring 12 are simultaneously arranged between valve body 10 and upper cover 8, so as to realize double sealing to reduce the risk of external leakage.

[0030] Packing compression plate 6 is locked and fixed on upper cover 8 by second stud.

[0031] It can be understood that the arc-shaped part at the bottom of packing compression plate 6 is pressed on the arc-shaped surface at the upper end of packing group 7.

[0032] In order to realize reliable sealing between plug 5 and bushing 13, the lower end tapered part of plug 5 is pressed on the inner wall of the tapered cavity of bushing 13. In work, plug 5 rotates, plug 5 is provided with a through hole, plug 5 is rotated to a position, valve body 10 is axially penetrated, and valve body 10 is rotated to another position, and valve body 10 is closed.

[0033] As Figure 5As shown, the outer surface of the bushing 13 at both upper and lower ends is configured with a clamping groove, and each clamping groove is clamped to a corresponding annular protruding part in the inner cavity of the valve body 10. The bushing 13 is a cylindrical structure, and the bushing 13 is provided with a through hole corresponding to the axial direction of the inner hole of the valve body 10, and the circumferential surface of the bushing 13 is further provided with a protruding part, and the protruding part on the surface of the bushing 13 is matched and arranged in the limiting groove configured on the inner wall of the valve body 10.

[0034] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A dual-ram modular-seal globe valve characterized by: The valve body (10) is sealed and connected with the upper cover (8) at the upper end of the middle cavity of the valve body (10), the plug (5) and the bushing (13) are installed in the middle cavity of the valve body (10), the bushing (13) is put into the valve body (10) along the radial direction of the middle cavity of the valve body (10), the plug (5) is pressed on the bushing (13), and the plug rod at the upper part of the plug (5) extends from the upper cover (8); The first O-shaped ring (9) and the packing group (7) are sequentially arranged from bottom to top at the packing box of the upper cover (8), the packing group (7) is tightly positioned by the packing pressing plate (6); The plug (5) is tightly positioned by the adjusting pressing plate (4), and the sealing specific pressure of the plug (5) can be adjusted.

2. The dual-ram modular seal globe valve of claim 1, wherein: The upper cover (8) is tightly connected with the valve body (10) by bolts, the winding gasket (11) and the second O-shaped ring (12) are arranged between the upper cover (8) and the valve body (10), and the winding gasket (11) is arranged in the inner ring of the second O-shaped ring (12).

3. The dual-ram modular seal globe valve of claim 1, wherein: The adjusting pressing plate (4) is locked above the upper cover (8) by the first stud (1), the first locking nut (2a) and the second locking nut (2b), the lower end of the first stud (1) is threadedly connected with the connecting column of the upper cover (8) after penetrating through the adjusting pressing plate (4), the second locking nut (2b) is threadedly connected on the first stud (1) and is tightly screwed on the top surface of the connecting column of the upper cover (8), and the first locking nut (2a) is threadedly connected on the first stud (1) and is tightly screwed on the upper surface of the adjusting pressing plate (4).

4. The dual-ram assembly seal globe valve of claim 1, wherein: The packing pressing plate (6) is locked and fixed on the upper cover (8) by the second stud.

5. The dual-ram assembly seal globe valve of claim 1, wherein: The arc-shaped part at the bottom of the packing pressing plate (6) is tightly pressed on the arc-shaped surface at the upper end of the packing group (7).

6. The dual-ram assembly seal globe valve of claim 1, wherein: The lower end of the plug (5) is tightly pressed on the inner wall of the conical cavity of the bushing (13).

7. The dual-ram assembly seal globe valve of claim 1, wherein: The outer surfaces of the upper end and the lower end of the bushing (13) are both provided with clamping grooves, and each clamping groove is clamped on the corresponding annular protruding part in the inner cavity of the valve body (10).

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