CN219139896U

CN219139896U - Low-leakage valve rod packing sealing device for ball valve

Info

Publication number: CN219139896U
Application number: CN202320176379.6U
Authority: CN
Inventors: 邓晓斌; 石明; 张莹
Original assignee: Xingyou Valve Shanghai Co ltd
Current assignee: Xingyou Valve Shanghai Co ltd
Priority date: 2023-02-10
Filing date: 2023-02-10
Publication date: 2023-06-06
Anticipated expiration: 2033-02-10

Abstract

The utility model discloses a low-leakage valve rod packing sealing device for a ball valve, which relates to the technical field of ball valves and comprises a valve body, a ball body and a valve rod, wherein the valve rod is connected with the valve body through a sealing device, an extrusion device for pressing the sealing device is sleeved at the top of the valve rod, four studs are fixedly connected to the top of the valve body, the extrusion device is sleeved on the outer side walls of the four studs at the same time, and nuts for fixing the extrusion device are sleeved on the outer side walls of the studs in a threaded manner. Through installing packing gland and packing jacket on the valve rod, utilize packing gland and packing jacket to prevent extruding ring, packing, prevent extruding ring and packing gasket down on, four double-screw bolts of top installation of valve body simultaneously, cup jointed a live load dish spring and nut on every double-screw bolt, can avoid the long-term pressure fluctuation of ball valve to exert the influence of pressing force to packing jacket down, reduce leakage risk.

Description

Low-leakage valve rod packing sealing device for ball valve

Technical Field

The utility model relates to the technical field of ball valves, in particular to a low-leakage valve rod packing sealing device for a ball valve.

Background

The ball valve is driven by the valve rod and rotates around the axis of the ball valve. The device can also be used for regulating and controlling fluid, wherein the hard seal V-shaped ball valve has strong shearing force between the V-shaped ball core and the metal valve seat of the hard alloy for surfacing, and is particularly suitable for mediums containing fibers, tiny solid particles and the like. The multi-way ball valve can flexibly control the confluence, the diversion and the flow direction switching of the medium on the pipeline, and simultaneously can close any channel to connect the other two channels. The valve should be installed generally horizontally in the pipeline.

Referring to fig. 1, the packing between the valve rod and the valve body of the existing ball valve is sealed only by adopting a conventional square packing, and simultaneously, the packing gland is pressed downwards by using the cooperation of two fixing studs and nuts, so that the sealing between the valve rod and the valve body is completed.

To this end, we propose a low leakage valve stem packing seal for ball valves to address the above problems.

Disclosure of Invention

The utility model aims to solve the problems in the prior art, and provides a low-leakage valve rod packing sealing device for a ball valve.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the low-leakage valve rod packing sealing device for the ball valve comprises a valve body, a ball body arranged in the valve body and a valve rod arranged at the top of the ball valve, wherein the top of the valve rod penetrates through the valve body and extends towards the top of the valve body, the valve rod is connected with the valve body through a sealing device, an extrusion device for pressing the sealing device is sleeved at the top of the valve rod, four studs are fixedly connected to the top of the valve body, the extrusion device is sleeved on the outer side walls of the four studs at the same time, and nuts for fixing the extrusion device are sleeved on the outer side walls of the studs in a threaded manner;

the sealing device comprises a packing gasket, a lower anti-extrusion ring, packing and an upper anti-extrusion ring which are sleeved on the outer side wall of the valve rod.

Preferably, the packing gasket, the lower anti-extrusion ring, the packing and the upper anti-extrusion ring are sequentially arranged from bottom to top.

Preferably, the filler gasket is a graphite gasket.

Preferably, the filler is wedge-shaped in shape.

Preferably, the extrusion device comprises a packing pressing sleeve sleeved on the outer side wall of the valve rod, the bottom of the packing pressing sleeve is propped against the top of the upper extrusion preventing ring, the outer side wall of the valve rod is sleeved with a packing gland, and the bottom of the packing gland is propped against the top of the packing pressing sleeve.

Preferably, the top of the packing gland is arranged in an arc shape, and the bottom of the packing gland is provided with an arc-shaped groove which is matched with the packing gland.

Preferably, the outer side wall of the stud is sleeved with a movable disc spring, and the movable disc spring is positioned between the nut and the packing gland.

The technical scheme provided by the embodiment of the utility model can comprise the following beneficial effects:

1. the packing gasket, the lower anti-extrusion ring, the packing and the upper anti-extrusion ring are filled between the valve rod and the valve body, so that the tightness between the valve rod and the valve body can be greatly improved, and the leakage risk is reduced;

2. through installing packing gland and packing jacket on the valve rod, utilize packing gland and packing jacket to prevent the extrusion ring on to, pack, prevent extrusion ring and packing gasket down, four double-screw bolts of top installation of valve body simultaneously, cup jointed a live load dish spring and nut on every double-screw bolt, can avoid the long-term pressure fluctuation of ball valve to the influence of packing jacket down exerting the holding pressure force, prevent to influence packing gasket, prevent extrusion ring down, packing and go up the sealing effect of extrusion ring between valve rod and the valve body, reduce leakage risk.

Drawings

FIG. 1 is a schematic view of a conventional ball valve;

FIG. 2 is a schematic diagram of a low leakage valve stem packing seal apparatus for a ball valve according to the present utility model;

FIG. 3 is a schematic diagram of the structure shown at A in FIG. 2;

fig. 4 is a schematic top view of a packing gland in a low leakage valve stem packing sealing device for a ball valve according to the present utility model.

In the figure: 1. a valve body; 2. a sphere; 3. a valve stem; 4. a filler gasket; 5. a lower anti-extrusion ring; 6. a filler; 7. an upper anti-extrusion ring; 8. packing pressing sleeve; 9. a packing gland; 10. a stud; 11. a nut; 12. a movable disc spring.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

Referring to fig. 2-4, a low leakage valve rod packing sealing device for a ball valve comprises a valve body 1, a ball body 2 arranged in the valve body 1 and a valve rod 3 arranged at the top of the ball valve, wherein the top of the valve rod 3 penetrates through the valve body 1 and extends towards the top of the valve body 1, the valve rod 3 is connected with the valve body 1 through a sealing device, an extrusion device for pressing the sealing device is sleeved at the top of the valve rod 3, four studs 10 are fixedly connected at the top of the valve body 1, the extrusion device is sleeved on the outer side walls of the four studs 10 at the same time, and nuts 11 for fixing the extrusion device are sleeved on the outer side walls of the studs 10 in a threaded manner.

In the utility model, more specifically, the sealing device comprises a packing gasket 4, a lower anti-extrusion ring 5, packing 6 and an upper anti-extrusion ring 7 which are sleeved on the outer side wall of the valve rod 3, and the packing gasket 4, the lower anti-extrusion ring 5, the packing 6 and the upper anti-extrusion ring 7 are sequentially arranged from bottom to top. The packing spacer 4 can prevent the packing 6 from being pressed to the clearance between the valve rod 3 and the valve body 1; the lower anti-extrusion ring 5 prevents the packing 6 from being crushed, and protects the bottom of the packing 6; the packing 6 adopts a specially designed wedge packing, the inner diameter of the packing tightly hugs the outer diameter of the valve rod 3 after being pressed, the outer diameter tightly expands to the inner diameter of a packing cavity of the valve body, and the tightness between the valve rod 3 and the valve body 1 is kept; the upper anti-extrusion ring 7 prevents the packing 6 from being crushed, protects the top of the packing 6, and the lower anti-extrusion ring 5 has the same function.

In the utility model, more specifically, the filler gasket 4 is a graphite gasket, and the reinforcing effect can be achieved by adding metal wires into the graphite.

In the present utility model, more specifically, the filler 6 has a wedge shape.

In the utility model, more specifically, the extrusion device comprises a packing pressing sleeve 8 sleeved on the outer side wall of the valve rod 3, the bottom of the packing pressing sleeve 8 is propped against the top of the upper anti-extrusion ring 7, the outer side wall of the valve rod 3 is sleeved with a packing gland 9, and the bottom of the packing gland 9 is propped against the top of the packing pressing sleeve 8.

In the utility model, more specifically, the top of the packing sleeve 8 is arranged in an arc shape, and the bottom of the packing cover 9 is provided with an arc-shaped groove with the packing sleeve 8.

In the utility model, more specifically, the outer side wall of the stud 10 is sleeved with the movable disc spring 12, the movable disc spring 12 is positioned between the nut 11 and the packing gland 9, the movable disc spring 12 can compensate temperature and pressure fluctuation, abrasion to the packing 6 caused by long-term use is avoided, and the movable disc spring has the effect of preventing the stud 10 and the nut 11 from loosening.

According to the utility model, the upper anti-extrusion ring 7, the wedge-shaped packing 6, the lower anti-extrusion ring 5 and the packing gasket 4 are sleeved on the outer side wall of the valve rod 3, the packing gland 9 and the packing gland 8 apply lower pressure to the upper anti-extrusion ring 7, the inner diameter of the packing 6 tightly holds the outer diameter of the valve rod 3 after being pressed, the outer diameter is tightly expanded to the inner diameter of a packing cavity of the valve body, the tightness between the valve rod 3 and the valve body 1 is maintained, the upper anti-extrusion ring 7 and the lower anti-extrusion ring 5 can also play a role of preventing the packing 6 from being crushed, in addition, nuts 11 and movable disc springs 12 are arranged on four studs 10, the movable disc springs 12 can compensate temperature and pressure fluctuation, abrasion to the packing 6 caused by long-term use is avoided, and the effect of preventing the studs 10 and the nuts 11 from loosening is achieved, so that good tightness is kept between the valve body 1 and the valve rod 3 for a long term, and leakage of the ball valve is avoided.

The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.

Claims

1. The utility model provides a low leakage valve rod packing sealing device for ball valve, includes valve body (1), setting ball (2) in valve body (1) and installs valve rod (3) at the ball valve top, the top of valve rod (3) runs through valve body (1) and extends to the top of valve body (1), a serial communication port, valve rod (3) are connected with valve body (1) through sealing device, extrusion device for pressing sealing device has been cup jointed at the top of valve rod (3), four double-screw bolts (10) are fixedly connected with at the top of valve body (1), extrusion device cup joints simultaneously on the lateral wall of four double-screw bolts (10), the lateral wall screw thread cup joints nut (11) that are used for fixing extrusion device;

the sealing device comprises a packing gasket (4), a lower anti-extrusion ring (5), packing (6) and an upper anti-extrusion ring (7) which are sleeved on the outer side wall of the valve rod (3).

2. The low-leakage valve rod packing sealing device for the ball valve according to claim 1, wherein the packing gasket (4), the lower anti-extrusion ring (5), the packing (6) and the upper anti-extrusion ring (7) are sequentially arranged from bottom to top.

3. A low leakage valve stem packing apparatus for ball valves according to claim 1, wherein said packing spacer (4) is a graphite spacer.

4. A low leakage valve stem packing seal for ball valves according to claim 1, wherein said packing (6) is wedge-shaped in shape.

5. The low-leakage valve rod packing sealing device for the ball valve according to claim 1, wherein the extruding device comprises a packing pressing sleeve (8) sleeved on the outer side wall of the valve rod (3), the bottom of the packing pressing sleeve (8) is propped against the top of the upper anti-extrusion ring (7), the outer side wall of the valve rod (3) is sleeved with a packing pressing cover (9), and the bottom of the packing pressing cover (9) is propped against the top of the packing pressing sleeve (8).

6. The low-leakage valve rod packing sealing device for the ball valve according to claim 5, wherein the top of the packing pressing sleeve (8) is arranged in an arc shape, and an arc-shaped groove which is matched with the packing pressing sleeve (8) is formed in the bottom of the packing pressing cover (9).

7. The low-leakage valve rod packing sealing device for the ball valve according to claim 5, wherein a movable disc spring (12) is sleeved on the outer side wall of the stud (10), and the movable disc spring (12) is positioned between the nut (11) and the packing gland (9).