CN216789299U

CN216789299U - Fixed ball valve of high leakproofness

Info

Publication number: CN216789299U
Application number: CN202220484545.4U
Authority: CN
Inventors: 袁仕敏
Original assignee: Zhejiang Mingao Valve Co ltd
Current assignee: Zhejiang Mingao Valve Co ltd
Priority date: 2022-03-08
Filing date: 2022-03-08
Publication date: 2022-06-21
Anticipated expiration: 2032-03-08

Abstract

The utility model provides a high-sealing fixed ball valve, which belongs to the technical field of ball valves and comprises a valve body, wherein a ball body and a valve seat which are matched in a sealing mode are arranged in the valve body, a valve cover and a bottom cover are arranged on the valve body, a valve rod is connected onto the ball body, a packing box is arranged between the valve rod and the valve cover, packing and double-lip sealing rings are arranged in the packing box, sealing assemblies are arranged at the joints of the valve cover, the bottom cover and the valve body and comprise X-shaped sealing rings and a plurality of O-shaped sealing rings, a plurality of sealing assemblies are arranged between the circumferential side wall of the valve seat and the valve body, a valve seat pressing ring is arranged on one side, away from the ball body, of the valve seat, a first elastic piece and a metal winding sealing pad are arranged between the valve seat pressing ring and a radial step of a valve body channel, and a sealing device is arranged between the second elastic piece and the radial step of the valve body channel; the utility model adopts the double-lip sealing ring, the sealing assembly and the sealing device to comprehensively improve the sealing performance of the ball valve.

Description

Fixed ball valve of high leakproofness

Technical Field

The utility model relates to the technical field of ball valves, in particular to a fixed ball valve with high sealing performance.

Background

Ball valves, valves in which the closure member (ball) is driven by the valve stem and rotates about the axis of the ball valve, can also be used for fluid regulation and control. The fixed ball valve is a new generation high-performance ball valve, is suitable for long-distance pipelines and general industrial pipelines, is specially considered in design for strength, safety, severe environment resistance and the like, and is suitable for various corrosive and non-corrosive media. Compared with a floating ball valve, when the ball valve works, the acting force generated by the fluid pressure in front of the valve on the ball body is completely transmitted to the bearing, the ball body cannot move to the valve seat, and therefore the valve seat cannot bear overlarge pressure, the fixed ball valve is small in torque, small in deformation of the valve seat, stable in sealing performance and long in service life, and is suitable for high-pressure and large-caliber occasions.

The sealing effect of the sealing structure that present fixed ball valve considered not comprehensive enough or set up is not good enough in sealing performance, and the sealed effect of fixed ball valve is not good can lead to the medium to leak, then causes the incident seriously, causes economic loss and endangers health.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a comprehensive fixed ball valve with high sealing performance.

The technical scheme adopted by the utility model is as follows: a fixed ball valve with high sealing performance comprises a valve body, wherein a ball body and a valve seat which are in sealing fit are arranged in the valve body, a valve cover and a bottom cover are arranged on the valve body, a valve rod is connected on the ball body, a packing box is arranged between the valve rod and the valve cover, packing and double-lip sealing rings arranged above and below the packing are arranged in the packing box, a packing gland which is detachably connected with the valve cover is arranged on the valve cover, sealing components are arranged at the joints of the valve cover, the bottom cover and the valve body and comprise an X-shaped sealing ring and a plurality of O-shaped sealing rings which are tightly attached and arranged, one side of each X-shaped sealing ring supports against the valve body, the other side of each X-shaped sealing ring supports against the plurality of O-shaped sealing rings, a plurality of sealing components are arranged between the circumferential side wall of the valve seat and the valve body, a valve seat pressing ring is arranged at one side of the valve seat, which is far away from the ball body, and a first elastic piece and a metal winding sealing gasket are arranged between the valve seat and the valve seat pressing ring, and a second elastic piece is arranged between the valve seat pressing ring and the radial step of the valve body channel, and a sealing device is arranged between the second elastic piece and the radial step of the valve body channel.

The sealing device comprises a first sealing gasket, a metal winding sealing gasket and a second sealing gasket, an annular convex shoulder and an annular groove are arranged between the joint of the first sealing gasket and the second sealing gasket and matched with each other, and the metal winding sealing gasket is arranged on two sides of the annular convex shoulder.

And a connecting flange is arranged at the medium inlet and the medium outlet of the valve body, a connecting sleeve is arranged outside the connecting flange, and the connecting flange and the connecting sleeve are connected through threads.

And rotary grooves are uniformly formed on the surface of the connecting flange around the connecting flange.

The end face of the connecting flange is provided with at least one sealing ring groove.

The valve rod penetrates through the valve cover and is connected with a driving device.

The valve seat is provided with a sealing surface and is sprayed with a hard alloy layer.

The valve rod and the ball body are of an integrated structure formed by welding.

The utility model has the following beneficial effects: according to the utility model, a double-lip sealing ring is adopted in the stuffing box to seal the stuffing, and the double-lip sealing ring is provided with a double lip opening to have double sealing effect; meanwhile, special sealing assemblies are adopted at the joints of the valve cover, the bottom cover and the valve body and the joints of the valve seat and the valve body, and the sealing assemblies use X-shaped sealing rings and a plurality of O-shaped sealing rings, wherein the X-shaped sealing rings have larger compression deformation and elastic compensation compared with common sealing rings, so that the sealing performance can be further improved, and reliable sealing performance can be provided even if the connecting gap at the joints is enlarged due to vibration or environmental factor influence; in addition, set up disk seat clamping ring and sealing device and can provide stable sealed pretightning force for between disk seat and the spheroid, guarantee the leakproofness between disk seat and the spheroid, the sealing performance of this ball valve obtains the comprehensive promotion.

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 schematic view of the present invention;

FIG. 2 is an enlarged view of FIG. 1 at A;

FIG. 3 is an enlarged view at B of FIG. 1;

FIG. 4 is a schematic view of a seal assembly of the present invention;

in the figure, 1-driving device, 2-packing gland, 3-valve cover, 4-connecting thread, 5-valve body, 6-connecting flange, 61-sealing ring groove, 7-connecting sleeve, 8-rotating groove, 9-bottom cover, 10-valve rod, 11-packing box, 111-packing, 112-double-lip sealing ring, 12-ball, 13-valve seat, 14-sealing component, 141-X-shaped sealing ring, 142-O-shaped sealing ring, 15-valve seat pressing ring, 16-first sealing gasket, 17-second sealing gasket, 18-second elastic piece, 19-metal winding sealing gasket and 20-first elastic piece.

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, which 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 4, in the embodiment of the present invention,

the utility model provides a fixed ball valve of high leakproofness, includes valve body 5, be equipped with sealed complex spheroid 12 and disk seat 13 in the valve body 5, be equipped with valve gap 3 and bottom 9 on the valve body 5, be connected with valve rod 10 on the spheroid 13, be equipped with packing box 11 between valve rod 10 and the valve gap 3, be equipped with packing 111 in the packing box 11 and set up two lip sealing washer 112 about packing 111, two lip sealing washer 112 are equipped with two lip and have the double seal effect, can be equipped with the storage lubricating grease that the oil storage tank comes more on two lip sealing washer 112, guarantee that the ball valve can not swell up under the high temperature operating mode to can effectual reduction ball valve operating torque, make its nimble open and close.

The valve cover 3 is provided with a packing gland 2 which is detachably connected, so that a sealed cavity is formed by the packing box 11, the joint of the valve cover 3, the bottom cover 9 and the valve body 5 is provided with a sealing component 14, the sealing component 14 comprises an X-shaped sealing ring 141 and a plurality of O-shaped sealing rings 142, the O-shaped sealing rings 142 are closely attached and arranged, one side of the X-shaped sealing ring 141 props against the valve body 5, the other side props against a plurality of O-shaped sealing rings 142, a plurality of sealing components 14 are arranged between the circumferential side wall of the valve seat 13 and the valve body 5, by adopting the sealing component 14 to provide expansion allowance for parts such as the valve body 5, the valve seat 13 and the like, because the X-shaped sealing ring has larger compression deformation and elastic compensation than the common sealing ring, the sealing performance can be further improved, reliable sealing performance can be provided even if the joint gap becomes large due to vibration or environmental factors.

A valve seat pressing ring 15 is arranged on one side, away from the sphere 12, of the valve seat 13, a first elastic piece 20 and a metal winding sealing gasket 19 are arranged between the valve seat 13 and the valve seat pressing ring 15, a second elastic piece 18 is arranged between the valve seat pressing ring 15 and a radial step of a channel of the valve body 5, a sealing device is arranged between the second elastic piece 18 and the radial step of the channel of the valve body 5, the elastic piece ensures enough pretightening force of the valve seat 13, and when a sealing surface of the valve seat 13 is abraded in the using process of the ball valve, the ball valve continues to ensure good sealing performance under the action of the elastic piece; the first elastic member 20 and the second elastic member 18 may be disc springs or cylindrical springs, and INCONEL X750 material may be used, so that the high temperature resistance and the high strength are excellent, and reliable pre-tightening compensation force can be provided.

The sealing device comprises a first sealing gasket 16, a metal winding sealing gasket 19 and a second sealing gasket 17, wherein an annular convex shoulder and an annular groove are arranged between the joint of the first sealing gasket 16 and the second sealing gasket 17 and matched with each other, in the embodiment, the first sealing gasket 16 is provided with the annular convex shoulder, the second sealing gasket 17 is provided with the annular groove, the protruding height of the annular convex shoulder is greater than the concave depth of the annular groove, the metal winding sealing gasket 19 is arranged on two sides of the annular convex shoulder, and the sealing performance of the cavity where the second elastic part 18 is located is ensured.

The medium access point department of valve body 5 is equipped with flange 6, flange 6 is equipped with adapter sleeve 7 outward and passes through threaded connection between the two, 7 surperficial circumferences of adapter sleeve evenly set up

rotation groove

8, 6 terminal surfaces of flange are equipped with one at least sealed annular 61, make adapter sleeve 7 rotatory can realize valve body 5 and outside pipeline quick installation and dismantlement through rotation groove 8, compare traditional flange joint faster more laborsaving, and the valve body both ends are provided with two seal grooves, and are sealed effectual.

The valve rod 10 is connected with a driving device 1 through a valve cover 3, and the power source of the driving device can be electric, pneumatic or manual.

The valve seat 13 is provided with a sealing surface and is sprayed with a hard alloy layer, and the hard alloy layer is made of STL alloy. STL stellite alloys, have high dimensional stability, very high wear, corrosion, oxidation and sulfidisation capacities, and have high wear resistance at temperatures below 870 ℃ due to high hot hardness.

The valve rod 10 and the ball body 12 are of an integrated structure formed by welding, the lower end of the ball body 12 is connected with a bottom cover, the ball body 12 is supported by upper and lower bearings, friction is reduced, and overlarge torque caused by huge sealing load formed by pushing the ball body 12 and the valve seat 13 by inlet pressure is eliminated.

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 high-sealing fixed ball valve comprises a valve body (5), wherein a ball body (12) and a valve seat (13) which are in sealing fit are arranged in the valve body (5), a valve cover (3) and a bottom cover (9) are arranged on the valve body (5), a valve rod (10) is connected onto the ball body (12), a stuffing box (11) is arranged between the valve rod (10) and the valve cover (3), the high-sealing fixed ball valve is characterized in that a stuffing (111) and double-lip sealing rings (112) which are arranged above and below the stuffing (111) are arranged in the stuffing box (11), a detachably connected stuffing cover (2) is arranged on the valve cover (3), sealing assemblies (14) are arranged at the joints of the valve cover (3), the bottom cover (9) and the valve body (5), each sealing assembly (14) comprises an X-shaped sealing ring (141) and a plurality of O-shaped sealing rings (142), and the O-shaped sealing rings (142) are tightly attached and arranged, x shape sealing washer (141) one side supports valve body (5), and the opposite side supports a plurality of O shape sealing washer (142), be equipped with a plurality of seal assembly (14) between disk seat (13) circumference lateral wall and valve body (5), spheroid (12) one side is kept away from in disk seat (13) is equipped with disk seat clamping ring (15), be equipped with between disk seat (13) and disk seat clamping ring (15) first elastic component (20) and the sealed pad (19) of metal winding, set up second elastic component (18) between disk seat clamping ring (15) and valve body (5) the radial step of passageway, be equipped with sealing device between second elastic component (18) and the radial step of valve body (5) passageway.

2. A high-tightness fixed ball valve according to claim 1, characterized in that said sealing means comprises a first sealing gasket (16), a metal-wound sealing gasket (19) and a second sealing gasket (17), an annular shoulder and an annular groove are provided between the joints of said first sealing gasket (16) and said second sealing gasket (17) for mutual engagement, and said metal-wound sealing gasket (19) is provided on both sides of said annular shoulder.

3. The fixed ball valve with high sealing performance according to claim 1, wherein a connecting flange (6) is arranged at a medium inlet and a medium outlet of the valve body (5), a connecting sleeve (7) is arranged outside the connecting flange (6), and the connecting flange and the connecting sleeve are connected through threads.

4. A high-sealing fixed ball valve according to claim 3, characterized in that the surface of the connecting sleeve (7) is uniformly provided with rotating grooves (8) around the circumference.

5. A high-sealing fixed ball valve according to claim 3, characterized in that the connecting flange (6) has at least one sealing ring groove (61) on its end surface.

6. A high-tightness fixed ball valve according to claim 1, characterized in that the valve rod (10) is connected with the driving device (1) through the valve cover (3).

7. A high-sealing fixed ball valve according to claim 1, wherein the valve seat (13) is provided with a sealing surface and is coated with a hard alloy layer.

8. A high-sealing fixed ball valve according to claim 1, wherein the valve stem (10) and the ball body (12) are welded and formed into an integral structure.