Ultrahigh-temperature gate valve

Abstract

The ultrahigh-temperature gate valve comprises a valve body, an elastic valve seat and a rigid valve seat are further arranged on the valve body, the ultrahigh-temperature gate valve further comprises a valve rod nut, and the valve rod nut and a valve rod move synchronously. A bearing and a bearing pressing ring are further arranged between the valve rod nut and the disc spring assembly, the valve rod extends upwards at high temperature to drive the valve rod nut to act on the bearing upwards, the bearing drives the bearing pressing ring to be elastically matched with the disc spring assembly, the adjusting screw is fixed to the upper end of the high-temperature support in a threaded mode, and an adjusting ball head is further arranged at the bottom of the adjusting screw. The bottom of the adjusting ball head penetrates through the through hole to act on a disc spring pressing ring above the disc spring assembly and is in elastic fit with the disc spring assembly through the disc spring pressing ring. Through the combined design that the disc spring assembly and the double valve seats are arranged at the rear end of the valve rod nut, the extension amount of the valve rod under the high-temperature condition can be absorbed, the axial thrust of the valve rod can be measured and calculated by adjusting the tightening torque of the screw, the initial closing force of the valve rod can be adjusted, and the situation that after closing is too large at the normal temperature, the anti-jamming allowance set at the high temperature is insufficient is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to an ultra-high temperature gate valve. Background Art

[0002] The main technical difficulty of existing high-temperature gate valves is that they are prone to high-temperature jamming. Since the temperatures of various parts of the valve are not exactly the same after the temperature rises, the expansion of various components is inconsistent, which will cause jamming and cause the valve to fail to open or close tightly, or the valve to be damaged. Wedge-type gate valves have better temperature resistance, but are prone to the technical defect that the valve stem after the temperature rises and the elongation of the valve stem will jam the gate plate, resulting in the inability to open after closing with excessive torque. Therefore, it is urgent to consider the design of fixed thrust and absorption of the adverse effects of uneven expansion in high-temperature gate valves. Summary of the invention

[0003] In order to solve the technical defects in the prior art, the present invention provides an ultra-high temperature gate valve.

[0004] The technical solution adopted by the present invention is: an ultra-high temperature gate valve, comprising a valve body, a valve stem is arranged in the valve body, a gate plate is connected to the valve stem, a valve cover is arranged on the valve body, and also comprises: A valve stem nut, wherein the valve stem nut is sleeved on the valve stem and moves synchronously with the valve stem; Disc spring assembly, the disc spring assembly is arranged on the valve stem nut, and a bearing and a bearing pressure ring are also arranged between the valve stem nut and the disc spring assembly. The valve stem elongates upward at high temperature to drive the valve stem nut to act upward on the bearing, and the bearing drives the bearing pressure ring to elastically cooperate with the disc spring assembly, and the disc spring assembly compresses and absorbs the upward elongation of the valve stem under high temperature conditions; A mounting bracket, the mounting bracket is arranged on the valve cover, a high-temperature bracket is also arranged on the mounting bracket, the high-temperature bracket and the mounting bracket are connected by threads and spot-welded to prevent retreat, a first step is formed on the inner side of the high-temperature bracket, the bearing pressure ring and the first step are limitedly matched, a second step is also formed on the inner side of the high-temperature bracket, and the second step and the disc spring assembly are limitedly matched; An adjusting screw, wherein the plurality of adjusting screws are threadedly fixed on the circumference of the upper end of the high-temperature bracket, an adjusting ball head is also provided at the bottom of the adjusting screw, a through hole is also provided in the high-temperature bracket, and the bottom of the adjusting ball head passes through the through hole to act on the disc spring pressure ring above the disc spring assembly through elastic cooperation between the disc spring pressure ring and the disc spring assembly; A first gap A, wherein the first gap A is the distance between the first step and the bearing pressure ring, and the first gap is the limit position of the valve stem expanding upward under high temperature conditions, and is used to prevent the butterfly spring assembly from being over-compressed; The second gap B is the distance that the adjusting ball head moves downward. The second gap B is the range in which the adjusting screw compresses the disc spring assembly downward through the adjusting ball head, that is, the adjustment range of the valve stem axial thrust of the initial thrust for closing the valve.

[0005] A boss is formed on the valve stem nut, and the boss acts on the disc spring assembly through the bearing and the bearing pressure ring.

[0006] The head of the adjusting ball head is a hemispherical structure, the width of the hemispherical structure is greater than the diameter of the through hole of the high-temperature bracket, the left and right sides of the hemispherical structure are limitedly matched with the upper end surface of the through hole of the high-temperature bracket, and the top of the hemispherical structure is in contact with the bottom of the adjusting screw.

[0007] It also includes a double valve seat assembly, which is arranged on the valve body and seals with the sealing surface of the gate plate.

[0008] The double valve seat assembly includes an elastic valve seat and a rigid valve seat from top to bottom. The elastic valve seat participates in sealing under normal temperature and medium and low pressure conditions, and the rigid valve seat participates in sealing after contacting the gate sealing surface after the elastic valve seat is heated and compressed under high temperature and high pressure conditions.

[0009] The gate is an elastic wedge-shaped gate, and the sealing surface width of the gate is more than twice that of an ordinary gate, which is beneficial to the contact sealing between the gate and the rigid valve seat after the elastic valve seat is compressed.

[0010] A two-step structure is formed in the valve body, and the elastic valve seat and the rigid valve seat are arranged on the two-step structure in sequence.

[0011] The elastic valve seat is composed of a corrugated structure and an annular structure.

[0012] A metal ring gasket is also arranged between the valve cover and the valve body.

[0013] A hand wheel is arranged on the top of the valve stem, and a locking nut and a limiting nut are also arranged on the valve stem above the hand wheel.

[0014] The beneficial effects of the present invention are as follows: the present invention provides an ultra-high temperature gate valve, including a valve body, a valve stem is arranged in the valve body, a gate plate is connected to the valve stem, a valve cover is also arranged on the valve body, and a valve stem nut is also included, the valve stem nut is sleeved on the valve stem, and the valve stem nut moves synchronously with the valve stem; a disc spring assembly is arranged on the valve stem nut, and a bearing and a bearing pressure ring are also arranged between the valve stem nut and the disc spring assembly. The valve stem elongates upward at high temperature and drives the valve stem nut to act upward on the bearing, and the bearing drives the bearing pressure ring to elastically cooperate with the disc spring assembly, and the disc spring assembly compresses and absorbs the upward elongation of the valve stem under high temperature conditions; the mounting bracket is provided It is placed on the valve cover, and a high-temperature bracket is also provided on the mounting bracket. A first step is formed on the inner side of the high-temperature bracket, and a bearing pressure ring is limitedly matched with the first step. A second step is also formed on the inner side of the high-temperature bracket, and the second step is limitedly matched with the disc spring assembly; a plurality of adjusting screws are threadedly fixed on the circumferential surface of the upper end of the high-temperature bracket, and an adjusting ball head is also provided at the bottom of the adjusting screw. A through hole is also provided in the high-temperature bracket, and the bottom of the adjusting ball head passes through the through hole to act on the disc spring pressure ring above the disc spring assembly through the elastic fit between the disc spring pressure ring and the disc spring assembly; the first gap A is the distance between the first step and the bearing pressure ring The first gap is the limit position of the valve stem expanding and extending upward under high temperature conditions, which is used to prevent the butterfly spring assembly from being over-compressed; the second gap B is the distance of the downward movement of the adjusting ball head. The second gap B is the range of the adjusting screw compressing the disc spring assembly downward through the adjusting ball head, that is, the adjustment range of the valve stem axial thrust of the initial thrust of closing the valve; the double valve seat assembly prevents the gate from being stuck and unable to open when the valve stem extends downward at high temperature. Its function is to push the gate downward when the valve stem expands downward due to heat, and the wedge-shaped gate compresses the elastic valve seat and then moves downward flexibly, and contacts the rigid valve seat when it moves to the designed limit position. A double seal is formed, and the function of the rigid valve seat is to increase the sealing surface width under high pressure, and can withstand greater sealing force to make the high-pressure sealing effect better. It also provides a downward extension limit for the high-temperature and high-pressure valve stem. At this time, the valve stem can only extend upward after the limit, and then the disc spring assembly on the upper part of the bracket absorbs the impact of the upward extension; the present invention arranges a disc spring assembly at the rear end of the valve stem nut, which can absorb the elongation of the valve stem under high temperature conditions, and can also calculate the axial thrust of the valve stem through the tightening torque of multiple adjusting screws, adjust the initial closing force of the valve stem, and avoid insufficient anti-jamming margin when setting at high temperature after closing too much at normal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention. Figure 2 This is an enlarged view of the structure of location I of the present invention.

[0016] Among them, 1-valve body, 2-valve stem, 3-gate, 4-valve cover, 5-valve stem nut, 6-high temperature bracket, 7-elastic valve seat, 8-rigid valve seat, 9-handwheel, 11-metal ring gasket, 21-locking nut, 22-limit nut, 41-mounting bracket, 51-disc spring assembly, 52-bearing, 53-bearing pressure ring, 61-adjusting screw, 62-adjusting ball head, 63-disc spring pressure ring. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] The ultra-high temperature gate valve comprises a valve body 1, wherein a valve stem 2 is arranged in the valve body 1, a gate plate 3 is connected to the valve stem 2, and the gate plate 3 is a wedge-shaped gate plate. A valve cover 4 is also arranged on the valve body 1, and further comprises: A valve stem nut 5, wherein the valve stem nut 5 is sleeved on the valve stem 2, and the valve stem nut 5 moves synchronously with the valve stem 2; Disc spring assembly 51, the disc spring assembly 51 is arranged on the valve stem nut 5, and a bearing 52 and a bearing pressure ring 53 are also arranged between the valve stem nut 5 and the disc spring assembly 51. The valve stem 2 elongates upward at high temperature and drives the valve stem nut 5 to act on the bearing 52 upward. The bearing 52 drives the bearing pressure ring 53 to elastically cooperate with the disc spring assembly 51, and the disc spring assembly 51 compresses and absorbs the upward elongation of the valve stem 2 under high temperature. A boss is formed on the valve stem nut 5, and the boss acts on the disc spring assembly 51 through the bearing 52 and the bearing pressure ring 53; A mounting bracket 41, wherein the mounting bracket 41 is arranged on the valve cover 4, and a high-temperature bracket 6 is also arranged on the mounting bracket 41, wherein a first step is formed on the inner side of the high-temperature bracket 6, and the bearing pressure ring 53 is limitedly matched with the first step, and a second step is also formed on the inner side of the high-temperature bracket 6, and the second step is limitedly matched with the disc spring assembly 51; Adjusting screw 61, the multiple adjusting screws 61 are threadedly fixed on the circumference of the upper end of the high-temperature bracket 6, the bottom of the adjusting screw 61 is also provided with an adjusting ball head 62, and the high-temperature bracket 6 is also provided with a through hole, the bottom of the adjusting ball head 62 passes through the through hole to act on the disc spring pressure ring 63 above the disc spring assembly 51 through the elastic cooperation between the disc spring pressure ring and the disc spring assembly 51, the head of the adjusting ball head 62 is a hemispherical structure, the width of the hemispherical structure is greater than the diameter of the through hole of the high-temperature bracket 6, the left and right sides of the hemispherical structure are limitedly cooperated with the upper end surface of the through hole of the high-temperature bracket 6, the top of the hemispherical structure is in contact with the bottom of the adjusting screw 61, the axial thrust of the valve stem can be measured by the tightening torque of the multiple adjusting screws, the initial closing force of the valve stem can be adjusted, and the anti-jamming margin of the high-temperature setting can be avoided to be insufficient after the closing force is too large at normal temperature; A first gap A, wherein the first gap A is the distance between the first step and the bearing pressure ring 53, and the first gap is the limit position of the valve stem 2 expanding upward under high temperature conditions, and is used to prevent the butterfly spring assembly from being over-compressed; The second gap B is the distance that the adjusting ball head 62 moves downward. The second gap B is the range in which the adjusting screw 61 compresses the disc spring assembly 51 downward through the adjusting ball head 62, that is, the adjustment range of the axial thrust of the valve stem 2 of the initial thrust for closing the valve.

[0019] It also includes a double valve seat assembly, which is arranged on the valve body 1 and seals with the sealing surface of the gate 3. The double valve seat assembly includes an elastic valve seat 7 and a rigid valve seat 8 from top to bottom. The elastic valve seat 7 is composed of a corrugated structure and a ring structure. The elastic valve seat 7 participates in sealing under normal temperature and medium and low pressure conditions, and the rigid valve seat 8 participates in sealing after the elastic valve seat 7 is heated and compressed under high temperature and high pressure conditions. The specific implementation is that when the valve stem 2 and the valve body 1 are heated, the internal temperature of the valve stem 1 will be high. Due to the temperature difference, the thermal elongation of the valve stem 2 is large. The valve stem 2 can only extend upward or downward when it is elongated, and pushes the gate plate 3 to move downward when it extends downward. The downward movement of the gate plate 3 pushes the elastic valve seat compression 7 to compress. Due to elasticity, the gate plate 3 moves downward more flexibly. When the temperature is too high, the gate plate 3 moves downward to a large extent and contacts and seals with the rigid valve seat 8. At this time, the gate plate 3 cannot continue to move downward, and the rigid valve seat 8 is rigidly limited. The valve stem 3 can only extend upward, and then the disc spring assembly on the upper part of the bracket absorbs the impact of the upward extension; through the high-temperature expansion and elongation compensation design of the upper and lower ends of the valve stem 3, it is ensured that the gate plate 2 and the valve stem 3 will not be blocked by excessive force during the whole process, ensuring flexible switching.

[0020] A two-step structure is formed in the valve body 1, and the elastic valve seat 7 and the rigid valve seat 8 are respectively arranged on the two-step structure in sequence.

[0021] A metal ring gasket 11 is also provided between the valve cover 4 and the valve body 1 .

[0022] A hand wheel 9 is provided on the top of the valve stem 2, and a locking nut 21 and a limit nut 22 are also provided on the valve stem 2 above the hand wheel. The limit nut 22 is a pair of nuts. The valve is closed in a cold state, and its axial thrust is calculated by the tightening torque of multiple adjusting screws 61. Then the sum of the axial forces is the axial thrust of the valve stem 3. After setting the total axial thrust of the valve stem 3, a pair of limit nuts are locked so that the valve stem 3 cannot move downward. The high-temperature elongation of the valve stem 3 is calculated by the thermal expansion coefficient of the valve stem 3 and the valve body 1 material, as well as the maximum design temperature of the valve. This expansion is compensated by the disc spring assembly at the double valve seat and the high-temperature bracket to eliminate its adverse effects.

[0023] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

[0024] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An ultra-high temperature gate valve, comprising a valve body (1), wherein a valve stem (2) is arranged in the valve body (1), a gate plate (3) is connected to the valve stem (2), and a valve cover (4) is also arranged on the valve body (1), characterized in that: Also included are: A valve stem nut (5), wherein the valve stem nut (5) is sleeved on the valve stem (2), and the valve stem nut (5) moves synchronously with the valve stem (2); A disc spring assembly (51), wherein the disc spring assembly (51) is arranged on the valve stem nut (5), and a bearing (52) and a bearing pressure ring (53) are further arranged between the valve stem nut (5) and the disc spring assembly (51); the valve stem (2) elongates upward at high temperature, driving the valve stem nut (5) to act upward on the bearing (52); the bearing (52) drives the bearing pressure ring (53) to elastically cooperate with the disc spring assembly (51), and the disc spring assembly (51) compresses and absorbs the upward elongation of the valve stem (2) at high temperature; A mounting bracket (41), the mounting bracket (41) being arranged on the valve cover (4), the mounting bracket (41) also being provided with a high-temperature bracket (6), a first step being formed on the inner side of the high-temperature bracket (6), the bearing pressure ring (53) being limitedly engaged with the first step, a second step being formed on the inner side of the high-temperature bracket (6), the second step being limitedly engaged with the disc spring assembly (51); An adjusting screw (61), wherein a plurality of the adjusting screws (61) are threadedly fixed on the circumference of the upper end of the high-temperature bracket (6), an adjusting ball head (62) is also provided at the bottom of the adjusting screw (61), and a through hole is also provided in the high-temperature bracket (6), and the bottom of the adjusting ball head (62) passes through the through hole and acts on the disc spring pressure ring (63) above the disc spring assembly (51) to elastically cooperate with the disc spring pressure ring and the disc spring assembly (51); a first gap A, wherein the first gap A is the distance between the first step and the bearing pressure ring (53), and the first gap is the limit position of the valve stem (2) expanding and extending upward under high temperature conditions, and is used to prevent the butterfly spring assembly from being over-compressed; The second gap B is the distance that the adjusting ball head (62) moves downward. The second gap B is the range in which the adjusting screw (61) compresses the disc spring assembly (51) downward through the adjusting ball head (62), that is, the adjustment range of the axial thrust of the valve stem (2) for the initial thrust of closing the valve.

2. The ultra-high temperature gate valve according to claim 1, characterized in that: A boss is formed on the valve stem nut (5), and the boss acts on the disc spring assembly (51) through a bearing (52) and a bearing pressure ring (53).

3. The ultra-high temperature gate valve according to claim 1, characterized in that: The head of the adjusting ball head (62) is a hemispherical structure, the width of the hemispherical structure is greater than the diameter of the through hole of the high-temperature bracket (6), the left and right sides of the hemispherical structure are limitedly matched with the upper end surface of the through hole of the high-temperature bracket (6), and the top of the hemispherical structure is in contact with the bottom of the adjusting screw (61).

4. The ultra-high temperature gate valve according to claim 1, characterized in that: It also includes a double valve seat assembly, which is arranged on the valve body (1) and seals with the sealing surface of the gate plate (3).

5. The ultra-high temperature gate valve according to claim 4, characterized in that: The double valve seat assembly comprises, from top to bottom, an elastic valve seat (7) and a rigid valve seat (8), wherein the elastic valve seat (7) participates in sealing under normal temperature and medium and low pressure conditions, and the rigid valve seat (8) contacts and seals with the sealing surface of the gate plate (3) after the elastic valve seat (7) is heated and compressed under high temperature and high pressure conditions.

6. The ultra-high temperature gate valve according to claim 1, characterized in that: The gate plate (3) is an elastic wedge-shaped gate plate.

7. The ultra-high temperature gate valve according to claim 5, characterized in that: A two-step structure is formed in the valve body (1), and the elastic valve seat (7) and the rigid valve seat (8) are respectively arranged on the two-step structure in sequence.

8. The ultra-high temperature gate valve according to claim 5, characterized in that: The elastic valve seat (7) consists of a corrugated structure and an annular structure.

9. The ultra-high temperature gate valve according to claim 1, characterized in that: A metal ring gasket (11) is also provided between the valve cover (4) and the valve body (1).

10. The ultra-high temperature gate valve according to claim 1, characterized in that: A hand wheel (9) is provided on the top of the valve stem (2), and a locking nut (21) and a limiting nut (22) are also provided on the valve stem (2) above the hand wheel.

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