Large-diameter ball valve

Abstract

The utility model discloses a large-caliber ball valve which comprises a valve body, a valve cover, a ball body and a valve seat and further comprises an annular check ring arranged between the valve cover and the valve seat, a check ring groove is formed in the inner wall of the valve cover, the outer side of the check ring is clamped in the check ring groove, and the check ring is arranged in the check ring groove. The valve seat comprises a valve seat ring and a spring seat ring detachably connected with the valve seat ring, a limiting groove is formed in the connecting position of the valve seat ring and the spring seat ring, and the inner side of the check ring is arranged in the limiting groove. And the use safety of the large-diameter ball valve is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve field, concretely relates to a large -caliber ball valve. BACKGROUND

[0002] Ball valve is mainly by valve body, valve seat, ball, valve rod and drive device etc. component composition. Valve body is the shell of ball valve, provides the basis of installation and support other components. Valve seat usually adopts wear -resisting, corrosion -resisting material and is made, is used for sealing the clearance between ball and valve body. Ball is the core component of ball valve, and there is a circular through hole on the ball, when the ball rotates, the through hole coincides with the pipeline axis or is perpendicular, realizes the opening and closing of valve. Valve rod connects ball and drive device, and transmits driving force to make the ball rotate. Drive device can be manual, electric, pneumatic or liquid driven, is used for operating the opening and closing of ball valve.

[0003] Large -caliber ball valve is usually used in the transportation of petroleum, gas, chemical industry and other industries, and the pressure involved is large, so if the large -caliber valve seat structure has the risk of falling off, it will cause personal injury. SUMMARY

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a large -caliber ball valve capable of preventing the valve seat from falling off.

[0005] In order to realize the above purpose, the technical scheme of the utility model is: a large -caliber ball valve, it includes valve body, valve cover, ball and valve seat, it still includes the annular check ring that is arranged between the valve cover with the valve seat, the inner wall of the valve cover is provided with check ring groove, the outer side of the check ring is clamped in the check ring groove, the valve seat includes valve seat ring and spring seat ring that is detachably connected with the valve seat ring, the connecting place of the valve seat ring with the spring seat ring is provided with limit groove, the inner side of the check ring is arranged in the limit groove.

[0006] Preferably, the check ring includes a plurality of check pieces, and the plurality of check pieces are connected after the end to form the check ring.

[0007] Further preferably, the check piece is provided with four.

[0008] Preferably, the limit groove of the valve seat ring includes a first step groove and a second step groove away from the valve cover in turn, an O-ring is arranged in the first step groove, and the bottom of the second step groove is tightly matched with the inner surface of the check ring.

[0009] Preferably, a sealing ring is fixedly arranged on the valve seat ring, and the sealing ring provides sealing between the valve seat ring and the ball.

[0010] Further preferably, a graphite ring is arranged on the outer side of the spring seat ring, and the graphite ring provides sealing between the spring seat ring and the valve cover.

[0011] Further preferably, a plurality of springs are provided between the valve cover and the spring seat ring.

[0012] Preferably, the valve seat ring and the spring seat ring are detachably connected by an inner hexagonal screw.

[0013] The utility model has the advantages of:

[0014] 1. The utility model discloses a stop ring is clamped between the valve seat ring and the spring seat ring, can effectively avoid the falling of the valve seat, promotes the use safety of large -diameter ball valve.

[0015] 2. Some big -grained impurities in medium will follow medium and flush the sealing surface, just use the structure of the utility model, and the stop ring and the O -ring can prevent the flushing of these big -grained impurities to the sealing element, prolong the service life of the ball valve. DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment description, the drawing in the following description is only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.

[0017] The utility model will be further described below in combination with the drawings and embodiments:

[0018] Figure 1 It is the structural schematic diagram of the embodiment;

[0019] Figure 2 It is the local enlarged view A of the structural schematic diagram of the embodiment;

[0020] Figure 3 It is the explosion schematic diagram of the embodiment.

[0021] Wherein: 1, valve cover;2, spring;3, spring seat ring;4, graphite ring;5, stop ring;6, valve seat ring;7, inner hexagonal screw;8, sealing ring;9, ball;10, valve body;11, O -ring. SPECIFIC IMPLEMENTATION

[0022] Referring to the drawings Figures 1-2 As shown in the figure, a large -diameter ball 9 valve includes valve body 10, valve cover 1, ball 9 body and valve seat, and it also includes annular stop ring 5 arranged between valve cover 1 and valve seat, the inner wall of valve cover 1 is provided with stop ring 5 groove, the outer side of stop ring 5 is clamped in stop ring 5 groove, and the valve seat includes valve seat ring 6 and spring seat ring 3 detachably connected with valve seat ring 6, the connecting place of valve seat ring 6 and spring seat ring 3 is provided with limit groove, and the inner side of stop ring 5 is arranged in limit groove.

[0023] The stop ring 5 comprises four stop pieces which are connected to form the stop ring 5.

[0024] The limiting groove of the valve seat ring 6 comprises a first step groove and a second step groove which are away from the bonnet 1 in sequence, the O-ring 11 is arranged in the first step groove, and the bottom of the second step groove is tightly matched with the inner surface of the stop ring 5.

[0025] The sealing ring 8 is fixedly arranged on the valve seat ring 6, the sealing ring 8 provides sealing between the valve seat ring 6 and the ball 9, the graphite ring 4 is arranged on the outer side of the spring seat ring 3, the graphite ring 4 provides sealing between the spring seat ring 3 and the bonnet 1, and the bonnet 1 and the spring seat ring 3 are provided with a plurality of springs 2.

[0026] The installation sequence is as follows: firstly, the sealing ring 8 is arranged in the valve seat ring 6 to form an assembly, the graphite ring 4 is arranged in the spring seat ring 3 to form an assembly, then the springs 2 are arranged in the bonnet 1 (the secondary valve body) in sequence, the spring seat ring 3 assembly is arranged in the bonnet 1 (the secondary valve body) and contacts the springs 2, then the stop ring 5 is arranged in the clamping groove, the valve seat sealing ring 8 assembly is arranged, finally, the valve seat sealing ring 8 assembly and the spring seat ring 3 assembly are connected by the inner hexagonal screw 7; in this way, the large-diameter ball 9 valve seat structure is installed.

[0027] Principle: after the valve seat is installed, the bonnet 1 (the secondary valve body) will appear a turning action in the whole valve process, the stop ring 5 of the valve seat structure will stop the sliding behavior of the valve seat in the process of the large-diameter ball 9 valve seat sliding down, after the whole valve is assembled, some large-particle impurities in the medium will flush the sealing surface together with the medium in the process of pressure entering the valve channel from the back of the valve seat, the stop ring 5 and the O-ring 11 can well stop the flushing of the large-particle impurities to the sealing element.

Claims

1. A large-diameter ball valve, comprising a valve body, a valve cover, a ball, and a valve seat, characterized in that: It also includes an annular retaining ring disposed between the valve cover and the valve seat. The inner wall of the valve cover is provided with a retaining ring groove, and the outer side of the retaining ring is engaged in the retaining ring groove. The valve seat includes a valve seat ring and a spring seat ring detachably connected to the valve seat ring. A limit groove is provided at the connection between the valve seat ring and the spring seat ring, and the inner side of the retaining ring is disposed in the limit groove.

2. The large-diameter ball valve according to claim 1, characterized in that: The retaining ring includes multiple retaining plates, which are joined together at their ends to form the retaining ring.

3. A large-diameter ball valve according to claim 2, characterized in that: There are four baffles.

4. A large-diameter ball valve according to claim 1, characterized in that: The limiting groove of the valve seat ring includes a first stepped groove and a second stepped groove that are sequentially away from the valve cover. An O-ring is provided in the first stepped groove, and the bottom of the second stepped groove is in close contact with the inner surface of the retaining ring.

5. A large-diameter ball valve according to claim 1, characterized in that: A sealing ring is fixedly provided on the valve seat ring, and the sealing ring provides a seal between the valve seat ring and the ball.

6. A large-diameter ball valve according to claim 5, characterized in that: A graphite ring is provided on the outer side of the spring seat, and the graphite ring provides a seal between the spring seat and the valve cover.

7. A large-diameter ball valve according to claim 6, characterized in that: Multiple springs are provided between the valve cover and the spring seat.

8. A large-diameter ball valve according to claim 1, characterized in that: The valve seat ring and the spring seat ring are detachably connected by an internal hex screw.

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