Deep cooling track ball valve seat structure

Abstract

The utility model relates to valve technical field especially relates to a deep cold track ball valve seat structure. It includes the valve body, the ball body in the valve body, the valve seat for cooperating with ball body installation, the valve rod for driving the ball body rotation realizes the valve body switch closing, the valve seat is used for cooperating with ball body installation, and forms the spherical surface sealing contact with the ball body, the valve seat rear end is provided with the wire spring, the valve seat is provided with the elastic U type groove, is provided with the elastic energy storage sealing ring between the valve seat and the valve body, and the positioning pressure plate that is used to limit the movement amount of valve seat and elastic energy storage sealing ring is through fastener and spring pad. The utility model has the advantages of: the technical scheme sets up the elastic U type groove on the valve seat, solves the sealing failure problem that the valve seat leads to thermal expansion and cold shrinkage under the low temperature working condition, sets up the elastic energy storage sealing ring and the positioning pressure plate between the valve body and the valve seat, effectively prevents the energy storage ring failure problem that leads to the valve seat displacement.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a valve seat structure for a cryogenic track ball valve. Background Technology

[0002] In recent years, with the rapid development of the petrochemical industry, cryogenic rail ball valves have been increasingly widely used in air separation units (such as oxygen and nitrogen production) and other cryogenic applications. These applications typically require valves to operate stably at extremely low temperatures (below -183°C), while also possessing advantages such as low flow resistance, excellent sealing performance, low torque, long service life, and no liquid accumulation in the single-seat cavity. Therefore, rail ball valves have become the preferred equipment in this field.

[0003] The existing technology, authorized by CN113503375B, describes a pressure self-balancing bidirectional sealing valve seat structure. In low-temperature environments, gaps arise between the valve ball and the valve seat due to material contraction, leading to sealing failure. Furthermore, the reverse high-pressure sealing performance is insufficient, easily causing internal leakage. The accumulator ring fails due to displacement or uneven stress during long-term use. Additionally, the inability to replace the valve seat online increases maintenance costs and downtime.

[0004] Therefore, a cryogenic orbital ball valve seat structure needs to be designed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a cryogenic orbital ball valve seat structure to overcome the aforementioned shortcomings of the existing technology.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A cryogenic orbital ball valve seat structure includes a valve body, a ball placed inside the valve body, a valve seat for mounting the ball, and a valve stem for driving the ball to rotate to achieve valve body opening and closing. The valve seat is characterized in that it is used to mount the ball and forms a spherical sealing contact with the ball; a wire spring is provided at the rear end of the valve seat; an elastic U-shaped groove is provided on the valve seat; an elastic energy-storing sealing ring is provided between the valve seat and the valve body; and a positioning pressure plate is used to limit the movement of the valve seat and the elastic energy-storing sealing ring by fasteners and spring washers.

[0007] Preferably, a positioning gasket and a sealing gasket are also provided between the valve seat and the coil spring.

[0008] Preferably, a gap is left between the positioning plate and the valve seat, and the gap is denoted as the floating amount S.

[0009] Preferably, the size of the floating amount S is greater than the deformation displacement that may occur on the valve stem during operation.

[0010] Preferably, the material of the elastic energy storage sealing ring is a low-temperature resistant rubber composite material.

[0011] Preferably, the elastic U-shaped groove is located near the position where the ball and valve seat make sealing contact.

[0012] The beneficial effects of this utility model are: by setting an elastic U-shaped groove on the valve seat, this technical solution solves the problem of sealing failure caused by thermal expansion and contraction of the valve seat under low temperature conditions; An elastic energy storage sealing ring and a positioning pressure plate are installed between the valve body and the valve seat, which effectively prevents the energy storage ring from failing due to valve seat displacement, while ensuring reverse high pressure sealing performance.

[0013] By incorporating a coil spring and sealing gaskets, the valve can operate stably for extended periods under cryogenic, high-frequency conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a cryogenic track ball valve seat according to the present invention; Figure 2 This is a partial enlarged view of the valve seat structure of a cryogenic track ball valve according to this utility model; Figure 3 This is a partial schematic diagram of the valve opening of a cryogenic track ball valve seat structure according to this utility model; In the diagram: 1. Valve body; 3. Stuffing gland; 4. Ball; 5. Valve seat; 51. Elastic U-groove; 6. Wire spring; 7. Positioning gasket; 8. Sealing gasket; 9. Elastic energy storage sealing ring; 10. Positioning pressure plate; 11. Fastener; 12. Spring washer. Detailed Implementation

[0015] Reference Figures 1 to 3 A cryogenic orbital ball valve seat structure includes a valve body 1 and a stuffing box 3 connected to the valve body 1 by fasteners. The valve body 1 has a hollow structure and an internal cavity for accommodating a ball 4 and other components. The stuffing box and the valve body 1 are connected to form a complete cavity structure.

[0016] A valve seat 5 is provided inside the valve body 1. The valve seat 5 is used to cooperate with the ball 4 for installation and forms a sealing contact with the ball, that is, a dynamic spherical seal. A coil spring 6 is provided at the rear end of the valve seat to provide initial sealing force. Its elastic properties ensure that the valve seat 5 always maintains tight contact with the ball 4. During valve operation, the elastic force of the coil spring 6 can automatically adjust with the position change of the valve seat 5, thereby maintaining stable sealing performance. In order to improve sealing performance and provide fire protection, a positioning gasket 7 and a sealing gasket 8 are also provided between the valve seat and the coil spring 6. To achieve reliable sealing under cryogenic conditions, the valve seat 5 is provided with an elastic U-shaped groove 51. When the valve seat contracts at low temperatures, it can compensate for the gap between the valve seat 5 and the ball 4. The design of the elastic U-shaped groove 51 can compensate for the gap between the valve seat 5 and the ball 4 caused by contraction through elastic deformation in cryogenic environments. When the valve seat 5 undergoes thermal expansion and contraction due to cryogenic conditions, the elastic deformation of the elastic U-shaped groove 51 is large enough to completely fill the gap between the valve seat 5 and the ball 4, thereby ensuring a tight seal. In addition, the shape and size of the elastic U-shaped groove 51 are precisely calculated so that it can provide sufficient elastic compensation under cryogenic conditions without causing material fatigue or damage due to excessive deformation.

[0017] An elastic energy storage sealing ring 9 is provided between the valve seat 5 and the valve body 1 to ensure the sealing performance between the valve seat 5 and the valve body 1. A positioning pressure plate 10 is used to limit the movement of the valve seat 5 and the elastic energy storage sealing ring 9 by means of fasteners 11 and spring washers 12. By adjusting the fasteners 11, a precise mechanical fit is achieved to ensure that the elastic energy storage sealing ring 9 remains stationary during the displacement of the valve seat 5. The elastic energy storage sealing ring is made of low-temperature resistant rubber composite material, which effectively prevents the failure of the elastic energy storage sealing ring 9 due to the displacement of the valve seat 5, and significantly extends the service life of the elastic energy storage sealing ring 9.

[0018] A gap, S, is maintained between the positioning plate 10 and the valve seat 5. This gap is precisely calculated to ensure that the floating amount S is greater than the possible deformation displacement X of the valve stem during operation. When the valve operates in reverse sealing mode, even if the valve stem deforms, the valve seat 5 can still maintain a tight fit with the ball 4 through the compensation effect of the floating amount S, avoiding internal leakage caused by valve stem deformation. Furthermore, the floating amount S is smaller than the disengagement amount W when the valve is opened, thus ensuring no wear on the ball seat during opening and closing, significantly extending the valve's service life. The floating amount S fully considers the actual requirements of valve stem deformation under cryogenic conditions, while also taking into account wear control during valve opening and closing, achieving an optimal balance between sealing performance and service life.

[0019] The valve seat 5 features a detachable design for easy online replacement. This detachable structure is achieved through the engagement of the positioning plate 10 and fasteners 11, solving the problem of traditional cryogenic orbital ball valves being unable to be maintained online. In practical applications, when the valve seat 5 needs replacement, simply loosening the fasteners 11 and removing the positioning plate 10 allows for quick disassembly and replacement. This design significantly improves maintenance efficiency, reduces downtime, and is particularly suitable for cryogenic operating conditions requiring high-frequency switching.

[0020] In addition, there are also packing assemblies, supports, valve stems and other structures, which are the same as existing technologies. You can refer to Baidu structures or background basic structures.

[0021] In actual operation, the cryogenic orbital ball valve works as follows: When the valve is closed, the ball 4 and the valve seat 5 form a tight spherical dynamic seal. The coil spring 6 provides the initial sealing force, and the elastic energy-storing sealing ring 9 ensures the sealing performance between the valve seat 5 and the valve body 1. When the valve is opened, the valve stem rotates, opening the fluid passage. When the valve is closed, the ball 4 re-fits the valve seat 5. The design of the floating amount S ensures that even if the valve stem deforms, the valve seat 5 can still maintain a tight fit with the ball 4, avoiding internal leakage. In addition, the design of the elastic U-groove 51 can compensate for the gap between the valve seat 5 and the ball 4 through elastic deformation in low-temperature environments, thereby ensuring a tight seal.

[0022] The advantages of this utility model are that by setting an elastic U-shaped groove on the valve seat, the sealing failure of the valve seat caused by thermal expansion and contraction under low temperature conditions is solved. An elastic energy storage sealing ring and a positioning pressure plate are installed between the valve body and the valve seat, which effectively prevents the energy storage ring from failing due to valve seat displacement, while ensuring reverse high pressure sealing performance.

[0023] By incorporating a coil spring and sealing gaskets, the valve can operate stably for extended periods under cryogenic, high-frequency conditions.

[0024] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cryogenic orbital ball valve seat structure, comprising a valve body, a ball disposed within the valve body, a valve seat for mounting the ball, and a valve stem for driving the ball to rotate to achieve opening and closing of the valve body, characterized in that: The valve seat is used to install with the ball and forms a spherical sealing contact with the ball. A wire spring is provided at the rear end of the valve seat. An elastic U-shaped groove is provided on the valve seat. An elastic energy storage sealing ring is provided between the valve seat and the valve body. A positioning pressure plate is used to limit the movement of the valve seat and the elastic energy storage sealing ring by fasteners and spring washers.

2. The cryogenic orbital ball valve seat structure according to claim 1, characterized in that: A positioning gasket and a sealing gasket are also provided between the valve seat and the coil spring.

3. The cryogenic orbital ball valve seat structure according to claim 1, characterized in that: A gap is left between the positioning plate and the valve seat, and the gap is denoted as the floating amount S.

4. The cryogenic orbital ball valve seat structure according to claim 3, characterized in that: The size of the floating amount S is greater than the deformation displacement that the valve stem may undergo during operation.

5. The cryogenic orbital ball valve seat structure according to claim 1, characterized in that: The elastic energy storage sealing ring is made of low-temperature resistant rubber composite material.

6. The valve seat structure of a cryogenic orbital ball valve according to claim 1, characterized in that: The elastic U-shaped groove is located near the position where the ball and valve seat make sealing contact.

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