CN216895852U

CN216895852U - Multiple sealed gate valve of preventing leaking

Info

Publication number: CN216895852U
Application number: CN202220651761.3U
Authority: CN
Inventors: 张景皓; 张建静; 潘建福
Original assignee: Hongchang Valve Co ltd
Current assignee: Hongchang Valve Co ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-07-05
Anticipated expiration: 2032-03-22

Abstract

The utility model provides a multiple-sealing leakage-proof gate valve, which belongs to the technical field of gate valves and comprises a valve body and a gate plate, wherein a valve seat is arranged in the valve body, a metal sealing surface and an elastic sealing surface are arranged between the gate plate and the valve seat, double sealing is realized, the sealing is reliable, meanwhile, a first sealing step and a second sealing step are arranged between the gate plate and the valve body to form further sealing, when the gate plate is closed, the first sealing step is propped against the second sealing step, and an elastic cushion is arranged at the joint of the first sealing step and the second sealing step, so that the stability of the gate plate under medium impact can be improved, and the reduction of the sealing area between the gate plate and the valve body due to the descending transition of the gate plate in the closing process can be avoided; in addition, a spring is arranged between the valve seat and the valve body, so that elastic compensation can be realized to ensure that the sealing surface of the gate plate is always in close contact with the sealing surface of the valve seat, the influence of environmental factors on each sealing surface of the gate valve is reduced, the flexible opening and closing of the gate valve is ensured, and the service life of the gate valve is prolonged.

Description

Multiple sealed gate valve of preventing leaking

Technical Field

The utility model relates to the technical field of gate valves, in particular to a multiple-seal leakage-proof gate valve.

Background

The gate valve is widely applied to various fields of petroleum, chemical industry, steel, metallurgy, electric power, natural gas and the like, and is used as an opening and closing device for connecting or cutting off a medium in a pipeline.

The gate valve in the prior art usually adopts single-side hard sealing between the gate plate and the valve seat, namely, hard metal sealing surfaces are arranged on the end surfaces of the gate plate, which are in contact with the valve seat, only by the single sealing surfaces, the sealing effect is poor, the gate valve can be worn under the pressure of a medium, the service life of the gate valve is shortened, and therefore the gate valve with a multiple sealing structure needs to be designed.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a multi-seal leakage-proof gate valve.

The technical scheme adopted by the utility model is as follows: a multi-seal anti-leakage gate valve comprises a valve body and a gate plate, wherein a valve seat used for being in seal fit with two sides of the gate plate is arranged in the valve body, first metal sealing end faces are arranged on two sides of the gate plate, a first elastic sealing ring and a second elastic sealing ring used for being in seal fit with the first metal sealing end faces are arranged on the valve seat, the first elastic sealing ring and the second elastic sealing ring are different in diameter, a second metal sealing end face is arranged between the first elastic sealing ring and the second elastic sealing ring, the first elastic sealing ring, the second elastic sealing ring and the second metal sealing end face are simultaneously in seal fit with the first metal sealing end faces, a spring mounting groove is arranged on the end face, connected with the valve body, of the valve seat, a spring is arranged in the spring mounting groove, a first sealing step is arranged on the upper side of the gate plate, a second sealing step is arranged on the lifting path of the valve body, when the gate plate is closed, the first sealing step is propped against the second sealing step, and elastic pads are arranged on the end faces of the first sealing step, which are propped against the second sealing step, and are propped against the second sealing step.

The valve body is provided with two medium channels, and the end faces of the flashboard, opposite to the two medium channels, are provided with arc-shaped recesses.

The flashboard upside is connected with the valve rod, the valve body upside is equipped with the valve gap, the valve rod runs through the valve gap just is equipped with the packing box between the two.

The stuffing box is internally provided with stuffing, and the upper side and the lower side of the stuffing are respectively provided with a stuffing pressing sleeve and a sealing base.

And the packing pressing sleeve is provided with a packing pressing plate, and the packing pressing plate is connected with the valve cover through a slipknot bolt.

The valve body is connected with the valve cover through the bolt assembly, and a metal winding gasket is arranged between the valve body and the valve cover.

The valve cap upper end is equipped with the support, the valve rod runs through the support and be equipped with valve-stem nut between the two, the valve-stem nut overcoat is equipped with stop nut.

The part of the valve rod extending out of the support is connected with a hand wheel and a locking nut used for fixing the hand wheel in a linkage manner.

The bottom of the valve body is provided with a dirt storage groove and a drain outlet.

And the ports of the two medium channels are provided with connecting flanges, and the end faces of the connecting flanges are provided with a plurality of connecting holes.

The utility model has the following beneficial effects: according to the utility model, the metal sealing surface and the elastic sealing surface are arranged between the flashboard and the valve seat, double sealing is realized, the sealing is reliable, meanwhile, a first sealing step and a second sealing step are arranged between the flashboard and the valve body to form further sealing, when the flashboard is closed, the first sealing step is propped against the second sealing step, and an elastic cushion is arranged at the joint of the first sealing step and the second sealing step, so that the stability of the flashboard under medium impact can be improved, and the reduction of the sealing area between the flashboard and the valve body caused by descending transition of the flashboard in the closing process can be avoided; in addition, a spring is arranged between the valve seat and the valve body, so that elastic compensation can be realized to ensure that the sealing surface of the gate plate is always in close contact with the sealing surface of the valve seat, the influence of environmental factors on each sealing surface of the gate valve is reduced, the flexible opening and closing of the gate valve is ensured, and the service life of the gate valve is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

FIG. 1 is a full sectional view of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

FIG. 3 is a half sectional view of the present invention;

in the figure, 1-valve body, 2-valve seat, 3-flashboard, 4-valve rod, 5-bolt, 6-nut, 7-metal wound gasket, 8-valve cover, 9-sealing base, 10-packing, 11-packing pressing sleeve, 12-packing pressing plate, 13-valve rod nut, 14-handwheel, 15-first metal sealing end face, 16-first elastic sealing ring, 17-second elastic sealing ring, 18-second metal sealing end face, 19-spring, 20-spring mounting groove, 21-second sealing step, 22-first sealing step, 23-elastic pad, 24-dirt storage groove, 25-dirt discharge outlet, 26-connecting flange, 27-connecting hole, 28-limiting nut, 29-locking nut, 30-bracket, 31-arc concave.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.

The terms of direction and position of the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., refer to the direction and position of the attached drawings. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

As shown in fig. 1 to 3, an embodiment of the present invention is provided:

a multi-seal leakage-proof gate valve comprises a valve body 1 and a gate plate 3, wherein a valve seat 2 used for being in sealing fit with two sides of the gate plate 3 is arranged in the valve body 1, first metal sealing end faces 15 are arranged on two sides of the gate plate 3, a first elastic sealing ring 16 and a second elastic sealing ring 17 used for being in sealing fit with the first metal sealing end faces 15 are arranged on the valve seat 2, the first elastic sealing ring 16 and the second elastic sealing ring 17 are different in diameter, a second metal sealing end face 18 is arranged between the first elastic sealing ring 16 and the second elastic sealing ring 17, the first elastic sealing ring 16, the second elastic sealing ring 17 and the second metal sealing end face 18 are simultaneously in sealing fit with the first metal sealing end faces 15, and a metal sealing face and an elastic sealing face are arranged between the gate plate 3 and the valve seat 2, so that double sealing is realized, and the sealing is reliable; wherein, the surfaces of the first metal sealing end face 15 and the second metal sealing end face 18 are sprayed with a high wear-resistant hard alloy layer, for example, a nickel-based alloy coating is adopted.

The terminal surface that disk seat 2 and valve body 1 meet is equipped with spring mounting groove 20, be equipped with spring 19 in the spring mounting groove 20, can elastic compensation guarantee that the sealed face of flashboard 3 all the time with the sealed face in close contact with of disk seat 2, reduce the influence of environmental factor to each sealed face of gate valve, guaranteed that the flexibility of gate valve is opened and is closed, prolonged the life of gate valve.

3 upsides of flashboard are equipped with first sealed step 22, valve body 1 is located and is equipped with the sealed step 21 of second on the 3 lift routes of flashboard when flashboard 3 is closed, first sealed step 22 supports the sealed step 21 of second, first sealed step 22 supports the terminal surface that the sealed step 21 of second is inconsistent and all is equipped with cushion 23, can promote the stability of flashboard 3 under the medium impact, can also avoid flashboard 3 to descend transition and make the seal area between flashboard 3 and the valve body 1 reduce or sealed the inefficacy closing the in-process.

The valve body 1 is provided with two medium channels, the end faces of the flashboards 3, opposite to the two medium channels, are provided with arc-shaped recesses 31, compared with a plane flashboard, when a medium exists in the medium channels, the flashboards 3 are closed, the medium can flow back along the arc-shaped recesses 31, the flashboards 3 are closed more easily, and materials can be saved.

The upper side of the flashboard 3 is connected with a valve rod 4, the upper side of the valve body 1 is provided with a valve cover 8, the valve rod 4 penetrates through the valve cover 8, and a packing box is arranged between the valve rod and the valve cover 8; the packing box is internally provided with packing 10, the upper side and the lower side of the packing 10 are respectively provided with a packing pressing sleeve 11 and a sealing base 9, the packing pressing sleeve 11 is provided with a packing pressing plate 12, the packing pressing plate 12 is connected with the valve cover 8 through a loose joint bolt, when the loose joint bolt is locked, the packing pressing plate 12 presses the packing pressing sleeve 11 to enable the packing pressing sleeve 11 to tightly press the packing 10 in the packing box, the difficulties of maintenance and packing replacement caused by the integration of the traditional packing box and the valve cover 8 can be avoided, the packing box can be detached and is convenient to maintain, and when the packing pressing plate 12, the packing pressing sleeve 11 and the sealing base 9 are arranged to enable the packing box to float up and down under the influence of medium pressure, the self-tightening function of the packing box is realized, the sealing performance between the valve rod 4 and the valve cover 8 is improved, micro leakage can be prevented, and the production safety is further ensured.

The valve body 1 and the valve cover 8 are connected through a bolt assembly, a metal winding gasket 7 is arranged between the valve body 1 and the valve cover 8, the metal winding gasket is formed by alternately overlapping and spirally winding SUS304 and graphite, a metal band is fixed at the beginning and the tail end in a spot welding mode, the sealing performance between the valve body 1 and the valve cover 8 can be improved, the service life is prolonged, and the bolt assembly comprises a stud 5 and a nut 6.

A support 30 is arranged at the upper end of the valve cover 8, the valve rod 4 penetrates through the support 30, a valve rod nut 13 is arranged between the support and the valve rod 4, a limit nut 28 is sleeved outside the valve rod nut 13, and the part of the valve rod 4 extending out of the support 30 is connected with a hand wheel 14 and a locking nut 29 for fixing the hand wheel 14 in a linkage manner; the linkage of the hand wheel 14 and the valve rod 4 can be realized, and the gate valve is opened or closed by controlling the lifting of the gate plate 3 through operating the hand wheel 14.

The bottom of the valve body 1 is provided with a sewage storage tank 24 and a sewage discharge port 25, and some residual media on the flashboard 3 can flow into the sewage storage tank 24 and be cleaned through the sewage discharge port 25 at any time.

And the ports of the two medium channels are provided with connecting flanges 26, the end faces of the connecting flanges 26 are provided with a plurality of connecting holes 27, and the stability of connection between the connecting holes and the pipelines is improved.

The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the utility model is not limited by the scope of the appended claims.

Claims

1. A multiple-seal leakage-proof gate valve comprises a valve body (1) and a gate plate (3), wherein a valve seat (2) which is used for being in sealing fit with two sides of the gate plate (3) is arranged in the valve body (1), the multiple-seal leakage-proof gate valve is characterized in that first metal sealing end faces (15) are arranged on two sides of the gate plate (3), a first elastic sealing ring (16) and a second elastic sealing ring (17) which are used for being in sealing fit with the first metal sealing end faces (15) are arranged on the valve seat (2), the diameters of the first elastic sealing ring (16) and the second elastic sealing ring (17) are different, a second metal sealing end face (18) is arranged between the first elastic sealing ring (16) and the second elastic sealing ring (17), the first elastic sealing ring (16), the second elastic sealing ring (17) and the second metal sealing end face (18) are simultaneously in sealing fit with the first metal sealing end face (15), a spring mounting groove (20) is arranged on the end face of the valve seat (2) and the valve body (1), be equipped with spring (19) in spring mounting groove (20), flashboard (3) upside is equipped with first sealed step (22), valve body (1) is located and is equipped with the sealed step of second (21) on flashboard (3) lifting path when flashboard (3) are closed, first sealed step (22) support the sealed step of second (21) inconsistent terminal surface all be equipped with cushion (23).

2. A multiple seal leakage preventing gate valve according to claim 1, characterized in that said valve body (1) is provided with two medium passages, and said gate plate (3) is provided with an arc-shaped recess (31) at its end face opposite to the two medium passages.

3. A multiple-seal leakage-proof gate valve according to claim 1, wherein a valve rod (4) is connected to the upper side of said gate plate (3), a valve cover (8) is provided on the upper side of said valve body (1), said valve rod (4) penetrates said valve cover (8) and a stuffing box is provided therebetween.

4. A multiple-seal leakage-proof gate valve according to claim 3, characterized in that a packing (10) is arranged in said packing box, and a packing pressing sleeve (11) and a seal base (9) are respectively arranged on the upper and lower sides of said packing (10).

5. A multiple seal leakage preventing gate valve according to claim 4, characterized in that a packing press plate (12) is provided on said packing press sleeve (11), said packing press plate (12) and said valve cover (8) are connected by a slipknot bolt.

6. A multiple seal leak-proof gate valve according to claim 3, characterized in that said valve body (1) and said valve cover (8) are connected by a bolt assembly with a metal wound gasket (7) therebetween.

7. A multiple-seal leakage-proof gate valve according to claim 3, wherein a support (30) is provided at the upper end of said valve cover (8), said valve rod (4) penetrates said support (30) and a valve rod nut (13) is provided therebetween, and a limit nut (28) is provided around said valve rod nut (13).

8. Multiple seal leakage prevention gate valve according to claim 7, characterized in that the part of the valve stem (4) extending out of the support (30) is linked with a hand wheel (14) and a lock nut (29) for fixing the hand wheel (14).

9. A multiple seal leakage preventing gate valve according to claim 1, characterized in that a dirt storage tank (24) and a dirt discharge outlet (25) are provided at the bottom of said valve body (1).

10. Multiple seal leakage gate valve according to claim 2, characterized in that at both media passage ports there is a connection flange (26), and that the end face of the connection flange (26) is provided with connection holes (27).