A low-temperature vertical-mounted ball valve and an assembly method thereof

Abstract

The present invention discloses a cryogenic vertical ball valve, which comprises a valve body, a valve cover, a ball and a valve seat. The ball is rotatably arranged in the valve body, and the valve seat is arranged on both sides of the ball. It is characterized in that: a support seat is arranged at the rear side of the valve seat, and the valve body is provided with a support seat hole for the support seat to be axially movably arranged therein. An outer ball groove is arranged on the outer circumferential surface of the support seat, and an inner ball groove is arranged on the inner hole surface of the support seat hole. Steel balls are embedded in the inner and outer ball grooves. The steel balls axially limit the support seat in the support seat hole and enable the support seat to perform low-friction circumferential rolling in the support seat hole. The valve body is provided with a steel ball introduction hole for introducing the outer steel balls into the inner and outer ball grooves. A spring is arranged between the support seat and the valve seat to make the valve seat tightly contact the surface of the ball; an outer pull ring groove is arranged in the inner hole of the valve seat, and an inner pull ring groove is arranged in the inner hole of the support seat. The present invention is applicable to cryogenic working occasions, can better ensure sealing and improve the service life. At the same time, the present invention provides an assembly method for the cryogenic vertical ball valve.

Description

Technical Field

[0001] The present invention relates to an improved invention of a cryogenic vertical ball valve and an assembly method thereof. Background Art

[0002] Ball valves are widely used in the pipeline transportation media cutting and circulation in industries such as petroleum, chemical industry, medicine, and textile. The vertical ball valve of the prior art includes a valve body, a valve cover, a ball, a valve seat, and a valve stem. The ball is rotatably arranged in the valve body. The upper end of the ball is connected to the valve stem, and the valve seat is arranged on both sides of the ball. The force of the tight contact between the valve seat and the surface of the ball is generally adjusted by rotating the fine-threaded screw provided in the inner hole or outer circle of the valve seat. However, under the influence of low temperature, the fine-threaded screw is not easy to rotate and is easily damaged, resulting in insufficient tight contact force between the valve seat and the surface of the ball, leading to poor contact and sealing, and affecting the service life. In addition, if a spring is used to push the valve seat to make the valve seat tightly contact the surface of the ball for sealing, then in order to enable the ball to be inserted into the valve body from the upper direction, the action stroke of the spring pushing the valve seat is often relatively large, and the length of the spring is relatively long, so the tight contact force between the valve seat and the surface of the ball is not easy to control. There is also a most crucial point. For the adjustment of rotating the fine-threaded screw and the adjustment of spring pushing, the tight contact position between the valve seat and the surface of the ball does not change during the operation of the ball valve. Due to factors such as installation errors, it is easy to cause excessive local wear of the tight contact between the valve seat and the surface of the ball, affecting the service life. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, first, the purpose of the present invention is to provide a cryogenic vertical ball valve applicable to low-temperature working occasions, which can better ensure sealing and improve the service life. The technical solution adopted is:

[0004] A cryogenic vertical ball valve includes a valve body, a valve cover, a ball, and a valve seat. The ball is rotatably arranged in the valve body. The upper end of the ball is connected to the upper valve stem, and the lower end is connected to the lower valve stem. The valve seat is arranged on both sides of the ball. It is characterized in that: a support seat is arranged at the rear side of the valve seat, and the valve body is provided with a support seat hole for the support seat to be axially movable therein. An outer ball groove is arranged on the outer circumferential surface of the support seat, and an inner ball groove is arranged on the inner hole surface of the support seat hole. Steel balls are embedded in the inner and outer ball grooves. The steel balls axially limit the support seat in the support seat hole and enable the support seat to perform low-friction circumferential rolling in the support seat hole. The valve body is provided with a steel ball introduction hole for introducing the outer steel balls into the inner and outer ball grooves. A spring is arranged between the support seat and the valve seat to make the valve seat tightly contact the surface of the ball. An outer pull ring groove is arranged in the inner hole of the valve seat, and the outer pull ring groove is used for a tool to pull the valve seat away from the ball so that the ball can be placed in the middle of the valve body. An inner pull ring groove is arranged in the inner hole of the support seat, and the inner pull ring groove is used for a tool to pull the support seat close to the ball so that the steel balls can be pressed into the inner and outer ball grooves.

[0005] The cryogenic vertical-mounted ball valve adopting the above technical solution firstly has no rotational adjustment setting of the fine-thread of the valve seat, which can be better applied to cryogenic working occasions. Secondly, through the free movement of the support seat, the action stroke of the spring pushing the valve seat can be very small, and when the ball valve is working, the valve seat can roll circumferentially with low friction along with the support seat, so that the tight contact position between the valve seat and the sphere surface can be adaptively adjusted as the sphere wears, eliminating the excessive local wear of the tight contact between the valve seat and the sphere surface caused by factors such as installation errors, and thus better ensuring sealing and extending the service life.

[0006] In addition, the present invention provides an assembly method for the cryogenic vertical-mounted ball valve adopting the above technical solution, and the technical solution adopted is:

[0007] An assembly method for a cryogenic vertical-mounted ball valve, characterized in that: the support seats and valve seats on both sides are sequentially placed into the support seat holes on both sides of the valve body, a spring is placed between the support seat and the valve seat, the lower valve stem is placed at the bottom of the valve body. Firstly, the valve seats on both sides are pulled outwards through the outer pull ring groove provided in the inner hole of the valve seat, so that the valve seats on both sides are separated from each other. Then, the sphere is placed into the valve body. Next, the support seat is pulled close to the sphere through the inner pull ring groove provided in the inner hole of the support seat, so that the outer ball groove on the outer circumferential surface of the support seat and the inner ball groove on the inner hole surface of the support seat hole are aligned with each other. Then, the required steel balls are pressed into the steel ball introduction hole provided in the valve body, so that the steel balls enter the inner and outer ball grooves. Subsequently, the opening of the steel ball introduction hole is blocked with a plug. Then, the installation of other components of the ball valve is carried out, and finally the assembly of the cryogenic vertical-mounted ball valve is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 is a schematic structural diagram of the cryogenic vertical-mounted ball valve of the present invention,

[0009] Figure 2 is Figure 1 a partial enlarged view of the lower half part,

[0010] Figure 3 is Figure 2 a side view of

[0011] Figure 4 is Figure 2 an enlarged view of part I of DETAILED DESCRIPTION OF THE EMBODIMENTS

[0012] As shown in the figure, a cryogenic vertical-mounted ball valve of the present invention, the cryogenic vertical-mounted ball valve, includes a valve body 4, a valve cover 5, a ball 1 and a valve seat 2. The ball 1 is rotatably arranged in the valve body 4. The upper end of the ball 1 is connected to the upper valve stem 6, and the lower end of the ball 1 is connected to the lower valve stem 13. The valve seats 2 are arranged on both sides of the ball 1. A support seat 3 is arranged at the rear side of the valve seat 2. The valve body 4 is provided with a support seat hole 11 for the support seat 3 to be axially movably arranged therein. An outer ball groove 32 is arranged on the outer circumferential surface of the support seat 3, and an inner ball groove 41 is arranged on the inner hole surface of the support seat hole 11. Steel balls 7 are embedded in the inner and outer ball grooves. The steel balls 7 axially limit the support seat 3 in the support seat hole 11 and enable the support seat 3 to perform low-friction circumferential rolling in the support seat hole 11. The valve body 4 is provided with a steel ball introduction hole 8 for introducing the outer steel balls into the inner and outer ball grooves. The opening of the steel ball introduction hole 8 is blocked by a plug 9. A spring 12 is arranged between the support seat 3 and the valve seat 2 to make the valve seat 2 tightly contact the surface of the ball 1. The rear half of the valve seat 2 is provided with a reduced-diameter section located in the support seat hole 11, and an energy storage sealing ring 10 is arranged on the outer circumference of the reduced-diameter section. An outer pull ring groove 21 is arranged in the inner hole of the valve seat 2. The outer pull ring groove 21 is used for a tool to pull the valve seat 2 away from the ball 1 so that the ball 1 can be placed in the middle of the valve body 4. An inner pull ring groove 31 is arranged in the inner hole of the support seat 3. The inner pull ring groove 31 is used for a tool to pull the support seat 3 close to the ball 1 so that the steel balls 7 can be pressed into the inner and outer ball grooves.

[0013] The assembly method of the above cryogenic vertical-mounted ball valve is as follows: The support seats and valve seats on both sides are sequentially placed into the support seat holes on both sides of the valve body. A spring is placed between the support seat and the valve seat. The lower valve stem is placed at the bottom of the valve body. First, use a pull rod to pass through the flow passage hole and buckle the outer pull ring groove arranged in the inner hole of the valve seat with a telescopic pressing plate, and pull the valve seats on both sides away from each other. Then, put the ball into the valve body. Next, use the pull rod to pass through the opposite flow passage hole and buckle the inner pull ring groove arranged in the inner hole of the support seat with a telescopic pressing plate, pull the support seat close to the ball and align the outer ball groove on the outer circumferential surface of the support seat and the inner ball groove on the inner hole surface of the support seat hole. Then, use a plastic rod to press the required steel balls into the steel ball introduction hole arranged in the valve body so that the steel balls enter the inner and outer ball grooves. Subsequently, block the opening of the steel ball introduction hole with a plug. Then, install other components of the ball valve. Finally, complete the assembly of the cryogenic vertical-mounted ball valve.

Claims

1. A cryogenic vertical-mounted ball valve, comprising a valve body, a valve cover, a ball and a valve seat. The ball is rotatably arranged in the valve body. The upper end of the ball is connected to an upper valve stem, and the lower end is connected to a lower valve stem. The valve seats are arranged on both sides of the ball, and it is characterized in that: A support seat is provided at the rear side of the valve seat, and the valve body is provided with a support seat hole for the support seat to be axially movably arranged therein. An outer ball groove is provided on the outer circumferential surface of the support seat, and an inner ball groove is provided on the inner hole surface of the support seat hole. Steel balls are embedded in the inner ball groove and the outer ball groove. The steel balls axially limit the support seat in the support seat hole and enable the support seat to perform low-friction circumferential rolling in the support seat hole. The valve body is provided with a steel ball introduction hole for introducing the outer steel balls into the inner ball groove and the outer ball groove. A spring is provided between the support seat and the valve seat to make the valve seat closely contact the sphere surface; an outer pull ring groove is provided in the inner hole of the valve seat, and the outer pull ring groove is used for a tool to pull the valve seat away from the sphere so that the sphere can be placed in the middle of the valve body. An inner pull ring groove is provided in the inner hole of the support seat, and the inner pull ring groove is used for a tool to pull the support seat close to the sphere so that the steel balls can be pressed into the inner ball groove and the outer ball groove.

2. The assembly method of a cryogenic vertical-mounted ball valve according to claim 1, characterized in that: The support seats and valve seats on both sides are sequentially placed into the support seat holes on both sides of the valve body. A spring is placed between the support seat and the valve seat. The lower valve stem is placed at the bottom of the valve body. First, the valve seats on both sides are pulled outwards through the outer pull ring groove provided in the inner hole of the valve seat, so that the valve seats on both sides are separated from each other. Then, the sphere is placed into the valve body. Next, the support seat is pulled close to the sphere through the inner pull ring groove provided in the inner hole of the support seat, so that the outer ball groove on the outer circumferential surface of the support seat and the inner ball groove on the inner hole surface of the support seat hole are aligned with each other. Then, the required steel balls are pressed into the steel ball introduction hole provided in the valve body, so that the steel balls enter the inner ball groove and the outer ball groove. Subsequently, the opening of the steel ball introduction hole is blocked with a plug. Then, the installation of other components of the ball valve is carried out. Finally, the assembly of the cryogenic vertical installation ball valve is completed.

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