High-temperature high-pressure hard-seal control ball valve

Abstract

High temperature and high pressure hard sealing control ball valve, including main valve body and vice valve body, be equipped with ball in main valve body, be connected with valve stem on ball, be equipped with fixed valve seat between main valve body and vice valve body, fixed valve seat is composed of middle way metal lens gasket and outlet end valve seat, middle way metal lens gasket and outlet end valve seat form integrated fixed valve seat structure, hard alloy is built up on the sealing surface of main valve body and vice valve body, main valve body and vice valve body and fixed valve seat are hard sealed by hard alloy, the sealing valve seat of outlet end is integrated design of middle way lens metal sealing gasket of main and vice valve body and metal valve seat, namely can realize high temperature and high pressure leakage-proof of main and vice valve body, also realize high temperature and high pressure sealing effect of outlet valve seat and valve body, realize the miniaturization of outlet sealing valve seat, facilitate process production, facilitate the build up of outlet valve seat and ball, finishing, and the cooperation of grinding problem of ball.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a high-temperature and high-pressure hard-seal control ball valve. Background Technology

[0002] High-temperature and high-pressure hard-seal control ball valves present significant technical challenges because the seal relies on the pre-tightening force between the ball and seat, as well as the force of the medium. Due to the need for high temperature resistance, the seat sealing surface must be a hard seal surface, requiring increased hardness, wear resistance, and high-temperature resistance. For high-pressure 2500Lb ball valves, the sealing surface must undergo precision machining after welding, and the mutual grinding of the seat and ball surfaces is necessary to ensure the required smoothness and spherical fit for a hard-on-hard seal. This necessitates a separate seat structure to facilitate welding, machining, and grinding processes. However, sealing the seat and valve body separately is also a major technical challenge. Typical high-temperature valves operating at 300-400 degrees Celsius use graphite-metal wire composite seals, but graphite oxidizes and fails at temperatures of 500-600 degrees Celsius and higher. The dynamic seal of the 2500Lb high-pressure graphite-metal wire seat is also prone to failure. Therefore, high-temperature and high-pressure hard-seal ball valves represent a major industry challenge requiring in-depth research and development.

[0003] For ball valves operating at temperatures above 500-600 degrees Celsius and pressures of 2500 lb and above, the reliability of their seals and the flexibility of their operation pose significant challenges to the industry. This is also a crucial reason why ball valves cannot be used in critical processes of key equipment under harsh high-temperature and high-pressure conditions. Currently, gate valves and globe valves are generally used in critical high-temperature and high-pressure applications. However, these valves require large installation spaces, have long opening and closing times, and struggle to meet rapid opening and closing requirements in emergencies, potentially leading to accidents. Ball valves, with their 90-degree rotary opening and closing mechanism, can achieve switching within seconds, preventing major safety accidents. Therefore, high-temperature and high-pressure hard-seal ball valves are core control products for major projects and a critical piece of equipment urgently requiring breakthroughs. Utility Model Content

[0004] In order to overcome the technical defects of the existing technology, this utility model provides a high temperature and high pressure hard seal control ball valve.

[0005] The technical solution adopted in this utility model is: a high-temperature and high-pressure hard-seal control ball valve, including a main valve body and a secondary valve body. The main valve body contains a ball, and a valve stem is connected to the ball. A fixed valve seat is provided between the main valve body and the secondary valve body. The fixed valve seat is composed of a middle metal lens gasket and an outlet valve seat. The middle metal lens gasket and the outlet valve seat form an integrated fixed valve seat structure. Hard alloy is welded onto the sealing surfaces of the main valve body and the secondary valve body. The main valve body and the secondary valve body are connected to the fixed valve seat through a hard seal by welding hard alloy.

[0006] The main valve body is provided with a floating valve seat at its inlet end. The floating valve seat is located between the ball and the main valve body. A disc spring assembly is also provided between the floating valve seat and the main valve body.

[0007] The main valve body is also provided with a heightening neck, which is connected to the main valve body by bolts.

[0008] The raised neck is also equipped with heat sinks.

[0009] The fixed valve seat has a metal lens gasket with bosses on both the top and bottom, and both sides of the bosses are sealing slopes.

[0010] The connection between the main valve body and the auxiliary valve body and the fixed valve seat is formed with a bevel structure corresponding to the sealing bevel of the middle metal lens gasket, and hard alloy is also welded onto the bevel structure.

[0011] Both the main valve body and the auxiliary valve body are made of forgings.

[0012] A metal lens gasket is also provided between the heightened neck and the main valve body, and a hard alloy is welded onto the heightened neck and the main valve body to achieve a seal with the metal lens gasket.

[0013] The beneficial effects of this utility model are as follows: This utility model provides a high-temperature and high-pressure hard-seal control ball valve, including a main valve body and a secondary valve body. A ball is provided inside the main valve body, and a valve stem is connected to the ball. A fixed valve seat is provided between the main valve body and the secondary valve body. The fixed valve seat is composed of a central metal lens gasket and an outlet valve seat. The central metal lens gasket and the outlet valve seat form an integrated fixed valve seat structure. Hard alloy is welded onto the sealing surfaces of the main valve body and the secondary valve body. The main valve body and the secondary valve body are hard-sealed with the fixed valve seat by hard alloy welding. The outlet sealing valve seat adopts an integrated design of the central lens metal sealing gasket of the main and secondary valve bodies and the metal valve seat. This can achieve the high-temperature and high-pressure resistance and non-leakage of the main and secondary valve bodies, and also achieve the high-temperature and high-pressure sealing effect between the outlet valve seat and the valve body. It also achieves the miniaturization of the outlet sealing valve seat, which is convenient for manufacturing. It also facilitates the welding, precision machining, and mating grinding of the outlet valve seat and the ball. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the structure of this utility model.

[0016] Figure 3 This is a schematic diagram of the fixed valve seat structure of this utility model.

[0017] Wherein: 1-Main valve body; 2-Subsidiary valve body; 3-Ball; 4-Fixed valve seat; 5-Floating valve seat; 6-Disc spring assembly; 7-Metal lens pad; 11-Heightened neck; 12-Heat sink; 41-Middle metal lens pad; 42-Outlet valve seat; 43-Boss structure. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] A high-temperature, high-pressure hard-seal control ball valve includes a main valve body 1 and a secondary valve body 2. The main valve body 1 contains a ball 3, and a valve stem is connected to the ball 3. A fixed valve seat 4 is provided between the main valve body 1 and the secondary valve body 2. The fixed valve seat 4 consists of a central metal lens gasket 41 and an outlet valve seat 42, forming an integrated fixed valve seat 4 structure. Hard alloy is welded onto the sealing surfaces of the main valve body 1 and the secondary valve body 2, and the main valve body 1 and the secondary valve body 2 are connected to the fixed valve seat 4 through a hard seal by welding hard alloy. This design integrates the central lens metal sealing gasket of the main and secondary valve bodies with the metal valve seat, achieving both high-temperature, high-pressure resistance and leak-proof operation of the main and secondary valve bodies, as well as a high-temperature, high-pressure sealing effect between the outlet valve seat and the valve body. It also minimizes the size of the outlet sealing valve seat, facilitating manufacturing and simplifying the welding, precision machining, and mating grinding of the outlet valve seat with the ball. The hardness of the hard alloy overlay is higher than that of the sealing spherical surface of the lens gasket. The larger hardness difference can generate a larger sealing specific pressure under the forced tightening force of the high-temperature and high-pressure bolt, thereby achieving high-temperature and high-pressure sealing and ensuring that the high-temperature and high-pressure medium does not leak out.

[0020] The main valve body 1 is provided with a floating valve seat 5 at the inlet end. The floating valve seat 5 is located between the ball 3 and the main valve body 1. A disc spring assembly 6 is also provided between the floating valve seat 5 and the main valve body 1. The floating structure achieves sealing at the valve seat at the medium outlet end and provides sealing pre-tightening at the inlet end. The pre-tightening specific pressure is provided to achieve initial sealing. Then, the medium thrust pushes the valve seat at the outlet end to achieve high temperature and high pressure sealing between the ball and the outlet valve seat. The inlet end adopts a movable valve seat and disc spring structure. The disc spring can provide pre-tightening thrust and absorb the dimensional elongation caused by the expansion of internal parts at high temperature to avoid high temperature jamming.

[0021] The main valve body 1 is also provided with a heightening neck 11, which is connected to the main valve body 1 by bolts.

[0022] The heightened neck 11 is also equipped with heat sink 12 to ensure that the temperature at the bottom of the stuffing box is low enough to ensure reliable sealing under high pressure.

[0023] The fixed valve seat 4 has a boss structure 43 on both the top and bottom of the middle metal lens gasket 41, and both sides of the boss structure 43 are sealing slopes.

[0024] The connection between the main valve body 1 and the auxiliary valve body 2 and the fixed valve seat 4 is formed with a bevel structure corresponding to the sealing bevel of the middle metal lens gasket 41, and hard alloy is also welded onto the bevel structure.

[0025] Both the main valve body 1 and the auxiliary valve body 2 are made of forgings to ensure the density of the material and its ability to withstand high temperature and high pressure.

[0026] A metal lens gasket is also provided between the heightened neck and the main valve body. Hard alloy is welded onto the heightened neck and the main valve body to achieve a seal with the metal lens gasket, ensuring that no external leakage will occur under high temperature and high pressure.

[0027] The valve of this invention requires installation according to the arrow direction to determine the flow direction, ensuring a valve seat seal in the outlet direction. For bidirectional sealing, two valves installed back-to-back on the same pipeline can achieve this. The main structural feature of this valve is that the portion below the stuffing box achieves a complete metal-to-metal seal, with a main seal between the ball and the outlet valve seat, all-metal lens gasket seals between the main and auxiliary valve bodies, and a metal lens gasket seal between the main valve body and the raised neck. Therefore, it has excellent high-temperature resistance; using a high-temperature alloy, it can achieve sealing at temperatures above 600℃. The all-metal seals are also pressure-resistant, meeting high-pressure sealing requirements above 4500Lb. This valve can be used in high-temperature, high-pressure main steam pipelines of power plants, and in high-temperature, high-pressure saturated steam pipelines of ultra-supercritical units. It can also be used in pipelines requiring control in other high-temperature, high-pressure equipment.

[0028] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of patent protection of this patent.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A high-temperature, high-pressure hard-seal control ball valve, comprising a main valve body (1) and a secondary valve body (2), wherein a ball (3) is provided inside the main valve body (1), and a valve stem is connected to the ball (3), characterized in that, A fixed valve seat (4) is provided between the main valve body (1) and the auxiliary valve body (2). The fixed valve seat (4) is composed of a middle metal lens gasket (41) and an outlet valve seat (42). The middle metal lens gasket (41) and the outlet valve seat (42) form an integral fixed valve seat (4) structure. Hard alloy is welded onto the sealing surfaces of the main valve body (1) and the auxiliary valve body (2). The main valve body (1) and the auxiliary valve body (2) are connected to the fixed valve seat (4) by hard sealing through hard alloy welding.

2. The high-temperature and high-pressure hard-seal control ball valve according to claim 1, characterized in that, The main valve body (1) is provided with a floating valve seat (5) at its inlet end. The floating valve seat (5) is located between the ball (3) and the main valve body (1). A disc spring assembly (6) is also provided between the floating valve seat (5) and the main valve body (1).

3. The high-temperature and high-pressure hard-seal control ball valve according to claim 1, characterized in that, The main valve body (1) is also provided with a heightening neck (11), and the heightening neck (11) is connected to the main valve body (1) by bolts.

4. The high-temperature and high-pressure hard-seal control ball valve according to claim 3, characterized in that, The heightened neck (11) is also provided with heat sinks (12).

5. The high-temperature and high-pressure hard-seal control ball valve according to claim 1, characterized in that, The fixed valve seat (4) has a boss structure (43) formed on both the top and bottom of the middle metal lens gasket (41), and both sides of the boss structure (43) are sealing slopes.

6. The high-temperature and high-pressure hard-seal control ball valve according to claim 5, characterized in that, The connection between the main valve body (1) and the auxiliary valve body (2) and the fixed valve seat (4) is formed with a slope structure corresponding to the sealing slope of the middle metal lens gasket (41), and hard alloy is also welded on the slope structure.

7. The high-temperature and high-pressure hard-seal control ball valve according to claim 1, characterized in that, Both the main valve body (1) and the auxiliary valve body (2) are made of forgings.

8. The high-temperature and high-pressure hard-seal control ball valve according to claim 3, characterized in that, A metal lens pad (7) is also provided between the heightened neck and the main valve body. Hard alloy and metal lens pads are welded onto both the heightened neck and the main valve body to achieve sealing.

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