High-temperature and high-pressure thermal recovery flat gate valve

Abstract

The utility model relates to the technical field of gate valves, in particular to a high-temperature and high-pressure thermal recovery flat gate valve which comprises a valve rod seat, a supporting seat, a valve cover, a main valve body, a valve rod, a valve rod nut, a valve plate, a left valve seat and a right valve seat. The lower side of the valve cover and the upper side of the main valve body are fixedly installed together, an upper valve rod cavity which is vertically through is formed in the valve rod seat, a middle valve rod cavity which is vertically through is formed in the supporting seat, and a lower valve rod cavity which is vertically through is formed in the valve cover. The check valve is reasonable and compact in structure and convenient to use, the valve rod drives the valve plate to move up and down by rotating the valve rod nut, so that after the valve plate moves downwards, the main valve hole is located below the liquid inlet hole, the valve cavity is blocked, the liquid inlet hole and the liquid outlet hole are not communicated any more, and the check valve has the advantages of being stable, reliable and good in sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of parallel gate valves and is a high-temperature and high-pressure thermal recovery flat gate valve. Background Art

[0002] At present, in the heavy oil production process, there are two major types of thermal recovery valves installed on the Christmas tree: one is the parallel gate valve and the other is the wedge gate valve. Among them, the main sealing pair (valve seat and valve body) and the secondary sealing pair (valve stem and valve cover) of the parallel gate valve adopt the structure of radially embedded O-rings in the valve seat and metal skeleton graphite packing to achieve sealing. Under the working environment of high temperature (337°C) and high pressure (14MPa), this sealing method has certain problems and shortcomings, mainly the following two points: (1) Due to the lack of axial end face sealing design, the structure is not perfect; (2) The seal is prone to rapid aging, damage or even disintegration and failure, which not only has a short life, but also has complex logistics support, and is difficult to repair, maintain and replace. These two points make the sealing reliability of the parallel gate valve unable to reach the best state, and are also the fundamental factors for its internal leakage and external leakage. Summary of the invention

[0003] The utility model provides a high-temperature and high-pressure thermal recovery flat gate valve, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problem of poor sealing effect of the existing parallel gate valve.

[0004] The technical scheme of the utility model is realized through the following measures: a high-temperature and high-pressure thermal recovery flat gate valve comprises a valve stem seat, a support seat, a valve cover, a main valve body, a valve stem, a valve stem nut, a valve plate, a left valve seat and a right valve seat, a support seat is fixedly installed on the outer side of the lower end of the valve stem seat, the lower side of the support seat is fixedly installed with the upper side of the valve cover, the lower side of the valve cover is fixedly installed with the upper side of the main valve body, an upper valve stem cavity which is connected up and down is provided in the valve stem seat, a middle valve stem cavity which is connected up and down is provided in the support seat, a lower valve stem cavity which is connected up and down is provided in the valve cover, a valve cavity which opens upward is provided on the upper side of the main valve body, a liquid inlet hole which can be connected with the valve cavity is provided on the left side of the main valve body, and a liquid inlet hole which can be connected with the valve cavity is provided on the right side of the main valve body corresponding to the position of the liquid inlet hole. a liquid outlet hole connected to the valve cavity; a valve stem nut is provided in the upper valve stem cavity, and a valve stem with its lower end located in the valve cavity is fixedly installed in the valve stem nut through a threaded connection, a valve plate which can move up and down as the valve stem rotates is installed at the lower end of the valve stem, a main valve hole which passes through left and right is provided on the valve plate corresponding to the position of the liquid inlet hole, a left valve seat located in the valve cavity is provided on the left side of the valve plate, a left valve hole is provided on the left valve seat corresponding to the position of the liquid inlet hole, a right valve seat located in the valve cavity is provided on the right side of the valve plate, and a right valve hole is provided on the right valve seat corresponding to the position of the liquid outlet hole; a rotating connector is provided between the valve stem seat and the valve stem nut, a rod seal is provided between the valve cover and the valve stem, and valve seat seals are provided between the left side of the left valve seat and the right side of the right valve seat and the main valve body.

[0005] The following are further optimizations and / or improvements to the above utility model technical solution:

[0006] The above-mentioned rod sealing assembly may include an upper sealing assembly, a lower sealing assembly and a pressure cap. An upper clamping ring groove is provided on the inner side of the lower end of the support seat, and a lower sealing ring groove is provided on the inner side of the upper end of the valve cover. The lower sealing ring groove is provided with a pressure cap, an upper sealing assembly and a lower sealing assembly located on the outer side of the valve stem from top to bottom in sequence, and the upper end of the pressure cap is located in the upper clamping ring groove.

[0007] The above-mentioned upper sealing assembly may include an upper pressure ring, a metal special-shaped sealing ring and a lower pressure ring. An upper ring groove is provided on the upper side of the metal special-shaped sealing ring, and the upper ring groove is in a parabolic shape with an opening upward. A lower ring groove is provided on the lower side of the metal special-shaped sealing ring, and the lower ring groove is in a parabolic shape with an opening downward. An inner ring groove is provided on the inner side of the metal special-shaped sealing ring, and the inner ring groove is in an isosceles trapezoidal shape with a wide outer side and a narrow inner side. An outer ring groove is provided on the outer side of the metal special-shaped sealing ring, and the outer ring groove is in an isosceles trapezoidal shape with a wide outer side and a narrow inner side. An upper convex ring platform matching the upper ring groove is provided on the lower side of the upper pressure ring, and a lower convex ring platform matching the lower ring groove is provided on the upper side of the lower pressure ring.

[0008] The lower sealing assembly may include an upper gasket, a packing assembly and a lower gasket which are arranged in sequence from top to bottom.

[0009] The above may also include an injection valve, a refueling hole that can communicate with the lower valve stem cavity is provided on the outer side of the valve cover corresponding to the position below the lower sealing assembly, and an injection valve is provided on the outer side of the valve cover corresponding to the position of the refueling hole.

[0010] The above-mentioned rotating connecting part may include a handwheel, an upper bearing, a lower bearing and a bearing cap. A stem nut with an upper end located above the stem seat is provided in the upper valve stem cavity, and a handwheel is fixedly installed on the outer side of the upper end of the stem nut; a supporting ring is provided on the outer side of the middle part of the valve plate nut, an upper bearing is provided between the stem nut and the stem seat corresponding to the position above the supporting ring, a lower bearing is provided between the stem nut and the stem seat corresponding to the position below the supporting ring, and a bearing cap is fixedly installed on the inner side of the upper end of the stem seat, the lower end of which is against the upper side of the upper bearing and is located on the outer side of the stem nut.

[0011] The valve seat seal can be a metal X-shaped sealing ring. A metal X-shaped sealing ring is provided between the left side of the left valve seat and the main valve body, and a metal X-shaped sealing ring is provided between the right side of the right valve seat and the main valve body.

[0012] The utility model has a reasonable and compact structure and is easy to use. The valve stem drives the valve plate to move up and down by rotating the valve stem nut. Therefore, after the valve plate moves downward, the main valve hole is located below the liquid inlet hole, thereby blocking the valve cavity so that the liquid inlet hole and the liquid outlet hole are no longer connected. The utility model has the characteristics of stability, reliability and good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the front cross-sectional structure of embodiments 1 to 7 of the present invention.

[0014] Attached Figure 2 For attachment Figure 1 Schematic diagram of the main cross-section and enlarged structure of the metal special-shaped sealing ring.

[0015] Attached Figure 3 For attachment Figure 1 Schematic diagram of the main cross-sectional enlarged structure of the middle and upper pressure ring.

[0016] The codes in the accompanying drawings are: 1 is the valve stem seat, 2 is the support seat, 3 is the valve cover, 4 is the main valve body, 5 is the valve stem, 6 is the valve stem nut, 7 is the valve plate, 8 is the left valve seat, 9 is the right valve seat, 10 is the pressure cap, 11 is the metal special-shaped sealing ring, 12 is the upper pressure ring, 13 is the upper gasket, 14 is the packing assembly, 15 is the lower gasket, 16 is the injection valve, 17 is the handwheel, 18 is the upper bearing, 19 is the lower bearing, 20 is the bearing pressure cap, 21 is the metal X-shaped sealing ring, 22 is the valve cavity, 23 is the liquid inlet hole, 24 is the liquid outlet hole, 25 is the left valve hole, 26 is the main valve hole, 27 is the right valve hole, 28 is the upper ring groove, 29 is the lower ring groove, 30 is the inner ring groove, 31 is the outer ring groove, 32 is the upper convex ring platform, 33 is the oil filling hole, and 34 is the support ring platform. DETAILED DESCRIPTION

[0017] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0018] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached manual. Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0019] The present invention is further described below in conjunction with the embodiments and drawings:

[0020] Embodiment 1: As attached Figure 1 , 2As shown in Figures 3 and 4, the high-temperature and high-pressure thermal recovery flat gate valve includes a valve stem seat 1, a support seat 2, a valve cover 3, a main valve body 4, a valve stem 5, a valve stem nut 6, a valve plate 7, a left valve seat 8 and a right valve seat 9. The support seat 2 is fixedly installed on the outer side of the lower end of the valve stem seat 1, the lower side of the support seat 2 is fixedly installed with the upper side of the valve cover 3, and the lower side of the valve cover 3 is fixedly installed with the upper side of the main valve body 4. An upper valve stem 5 cavity that passes through from top to bottom is provided in the valve stem seat 1, a middle valve stem 5 cavity that passes through from top to bottom is provided in the support seat 2, and a lower valve stem 5 cavity that passes through from top to bottom is provided in the valve cover 3. A valve cavity 22 opening upward is provided on the upper side of the main valve body 4, a liquid inlet hole 23 that can be communicated with the valve cavity 22 is provided on the left side of the main valve body 4, and a liquid outlet hole 24 that can be communicated with the valve cavity 22 is provided on the right side of the main valve body 4 corresponding to the position of the liquid inlet hole 23; A valve stem nut 6 is provided in the valve stem 5 cavity, and the valve stem 5 with the lower end located in the valve cavity 22 is fixedly installed in the valve stem nut 6 through a threaded connection. A valve plate 7 is installed at the lower end of the valve stem 5, and can move up and down with the rotation of the valve stem 5. A main valve hole 26 that passes through the left and right is provided on the valve plate 7 corresponding to the position of the liquid inlet hole 23. A left valve seat 8 located in the valve cavity 22 is provided on the left side of the valve plate 7, and a left valve hole 25 is provided on the left valve seat 8 corresponding to the position of the liquid inlet hole 23. A right valve seat 9 located in the valve cavity 22 is provided on the right side of the valve plate 7, and a right valve hole 27 is provided on the right valve seat 9 corresponding to the position of the liquid outlet hole 24; a rotating connector is provided between the valve stem seat 1 and the valve stem nut 6, a rod seal is provided between the valve cover 3 and the valve stem 5, and valve seat seals are provided between the left side of the left valve seat 8 and the right side of the right valve seat 9 and the main valve body 4. During use, the valve stem 5 drives the valve plate 7 to move up and down by rotating the valve stem nut 6, so that after the valve plate 7 moves downward, the main valve hole 26 is located below the liquid inlet hole 23, thereby blocking the valve cavity 22 so that the liquid inlet hole 23 and the liquid outlet hole 24 are no longer connected; by arranging the stem seal, the sealing between the valve stem 5 and the valve stem 5 is achieved; by arranging the valve seat seal, the sealing between the left valve seat 8 and the right valve seat 9 and the main valve body 4 is achieved, which effectively solves the problem of poor sealing effect of the existing parallel gate valve.

[0021] The above-mentioned high temperature and high pressure thermal recovery flat gate valve can be further optimized and / or improved according to actual needs:

[0022] Embodiment 2: As attached Figure 1 , 2 As shown in Figures 3 and 4, the stem sealing assembly includes an upper sealing assembly, a lower sealing assembly and a pressure cap 10. An upper clamping ring groove is provided on the inner side of the lower end of the support seat 2, and a lower sealing ring groove is provided on the inner side of the upper end of the valve cover 3. The pressure cap 10, the upper sealing assembly and the lower sealing assembly located on the outer side of the valve stem 5 are provided in the lower sealing ring groove from top to bottom. The upper end of the pressure cap 10 is located in the upper clamping ring groove. During use, the upper sealing assembly and the lower sealing assembly are installed between the valve stem 5 and the valve cover 3, and the pressure cap 10 is adjusted through the support seat 2, so as to change the axial pressure applied to the upper sealing assembly and the lower sealing assembly; in addition, a gap is left between the pressure cap 10 and the valve cover 3 to increase the heat dissipation area.

[0023] Embodiment 3: As attached Figure 1 , 2 As shown in , 3, the upper sealing assembly includes an upper pressure ring 12, a metal special-shaped sealing ring 11 and a lower pressure ring. An upper ring groove 28 is provided on the upper side of the metal special-shaped sealing ring 11, and the upper ring groove 28 is in a parabolic shape with an opening upward. A lower ring groove 29 is provided on the lower side of the metal special-shaped sealing ring 11, and the lower ring groove 29 is in a parabolic shape with an opening downward. An inner ring groove 30 is provided on the inner side of the metal special-shaped sealing ring 11, and the inner ring groove 30 is in an isosceles trapezoidal shape with a wide outer side and a narrow inner side. An outer ring groove 31 is provided on the outer side of the metal special-shaped sealing ring 11, and the outer ring groove 31 is in an isosceles trapezoidal shape with a wide outer side and a narrow inner side. An upper convex ring platform 32 matching the upper ring groove 28 is provided on the lower side of the upper pressure ring 12, and a lower convex ring platform matching the lower ring groove 29 is provided on the upper side of the lower pressure ring. During use, the pressure cap squeezes the metal profiled seal ring 11 between the valve stem 5 and the valve cover 3, causing the metal profiled seal ring 11 to deform in both the axial and radial directions, filling the gap between the valve cover 3 and the valve stem 5, and integrating the radial seal and the axial seal with the metal profiled seal ring 11, thereby increasing the heat dissipation area of ​​the secondary seal pair, optimizing its axial adjustment structure, and extending the service life under high temperature and high pressure conditions. The utility model adopts metal materials and new structures to extend the service life of the seal, and can solve the internal leakage and external leakage problems of the thermal recovery parallel gate valve used in heavy oil production to the greatest extent, reduce the labor intensity of maintenance, repair, and replacement, and reduce the pressure of logistics supply.

[0024] Embodiment 4: As attached Figure 1 , 2 As shown in FIG. 3 , the lower sealing assembly includes an upper gasket 13, a packing assembly 14 and a lower gasket 15 arranged in sequence from top to bottom. In use, the sealing performance between the valve cover 3 and the valve stem 5 is guaranteed by such an arrangement.

[0025] Embodiment 5: As attached Figure 1 , 2 3, it also includes an injection valve 16, and a refueling hole 33 that can communicate with the cavity of the lower valve stem 5 is provided on the outer side of the valve cover 3 corresponding to the position below the lower sealing assembly, and an injection valve 16 is provided on the outer side of the valve cover 3 corresponding to the position of the refueling hole 33. During use, such a setting makes it easy to add sealing grease or lubricating oil to improve the sealing performance between the valve cover 3 and the valve stem 5.

[0026] Embodiment 6: As attached Figure 1 , 2As shown in Figure 3, the rotating connecting member includes a hand wheel 17, an upper bearing 18, a lower bearing 19 and a bearing cap 20. A valve stem nut 6 with its upper end located above the valve stem seat 1 is provided in the cavity of the upper valve stem 5, and a hand wheel 17 is fixedly installed on the outer side of the upper end of the valve stem nut 6; a support ring 34 is provided on the outer side of the middle part of the nut of the valve plate 7, an upper bearing 18 is provided between the valve stem nut 6 and the valve stem seat 1 at the position above the support ring 34, a lower bearing 19 is provided between the valve stem nut 6 and the valve stem seat 1 at the position below the support ring 34, and a bearing cap 20 with its lower end against the upper side of the upper bearing 18 and located on the outer side of the valve stem nut 6 is fixedly installed on the inner side of the upper end of the valve stem seat 1. In use, through such a setting, it is convenient to rotate the valve stem nut 6 to move the valve stem 5 up and down, thereby driving the valve plate 7 to open and close.

[0027] Embodiment 7: As attached Figure 1 , 2 As shown in Figures 3 and 4, the valve seat seal is a metal X-shaped seal ring 21. A metal X-shaped seal ring 21 is provided between the left side of the left valve seat 8 and the main valve body 4, and a metal X-shaped seal ring 21 is provided between the right side of the right valve seat 9 and the main valve body 4. During use, the valve plate 7 squeezes the left valve seat 8 and the right valve seat 9 on both sides against the inner end surface of the main valve body 4, causing the metal X-shaped seal ring 21 to deform in the axial and radial directions at the same time, filling the gap between the left valve seat 8 and the right valve seat 9 and the main valve body 4. The metal X-shaped seal ring 21 made of metal material integrates the radial seal and the axial seal into one, increases the heat dissipation area of ​​the secondary seal pair, optimizes its axial adjustment structure, and prolongs the service life under high temperature and high pressure conditions.

[0028] The above technical features constitute the embodiments of the present utility model, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A high temperature and high pressure thermal recovery flat gate valve, characterized in that It includes a valve stem seat, a support seat, a valve cover, a main valve body, a valve stem, a valve stem nut, a valve plate, a left valve seat and a right valve seat. A support seat is fixedly installed on the outer side of the lower end of the valve stem seat, the lower side of the support seat is fixedly installed with the upper side of the valve cover, the lower side of the valve cover is fixedly installed with the upper side of the main valve body, an upper valve stem cavity which passes through from top to bottom is arranged in the valve stem seat, a middle valve stem cavity which passes through from top to bottom is arranged in the support seat, a lower valve stem cavity which passes through from top to bottom is arranged in the valve cover, a valve cavity which opens upward is arranged on the upper side of the main valve body, a liquid inlet hole which can be connected with the valve cavity is arranged on the left side of the main valve body, and a liquid outlet hole which can be connected with the valve cavity is arranged on the right side of the main valve body corresponding to the position of the liquid inlet hole; a valve is arranged in the upper valve stem cavity A stem nut, in which a valve stem with its lower end located in the valve cavity is fixedly installed through a threaded connection, a valve plate which can move up and down as the valve stem rotates is installed at the lower end of the valve stem, a main valve hole which passes through left and right is provided on the valve plate corresponding to the position of the liquid inlet hole, a left valve seat located in the valve cavity is provided on the left side of the valve plate, a left valve hole is provided on the left valve seat corresponding to the position of the liquid inlet hole, a right valve seat located in the valve cavity is provided on the right side of the valve plate, and a right valve hole is provided on the right valve seat corresponding to the position of the liquid outlet hole; a rotating connector is provided between the valve stem seat and the stem nut, a stem seal is provided between the valve cover and the valve stem, and valve seat seals are provided between the left side of the left valve seat and the right side of the right valve seat and the main valve body.

2. The high temperature and high pressure thermal recovery flat gate valve according to claim 1 is characterized in that The rod sealing assembly includes an upper sealing assembly, a lower sealing assembly and a pressure cap. An upper clamping ring groove is provided on the inner side of the lower end of the support seat, and a lower sealing ring groove is provided on the inner side of the upper end of the valve cover. The lower sealing ring groove is provided with a pressure cap, an upper sealing assembly and a lower sealing assembly located on the outer side of the valve stem from top to bottom, and the upper end of the pressure cap is located in the upper clamping ring groove.

3. The high temperature and high pressure thermal recovery flat gate valve according to claim 2 is characterized in that The upper sealing assembly includes an upper pressure ring, a metal special-shaped sealing ring and a lower pressure ring. An upper ring groove is provided on the upper side of the metal special-shaped sealing ring, and the upper ring groove is in a parabolic shape with an opening upward. A lower ring groove is provided on the lower side of the metal special-shaped sealing ring, and the lower ring groove is in a parabolic shape with an opening downward. An inner ring groove is provided on the inner side of the metal special-shaped sealing ring, and the inner ring groove is in an isosceles trapezoidal shape with a wide outer side and a narrow inner side. An outer ring groove is provided on the outer side of the metal special-shaped sealing ring, and the outer ring groove is in an isosceles trapezoidal shape with a wide outer side and a narrow inner side. An upper convex ring platform matching the upper ring groove is provided on the lower side of the upper pressure ring, and a lower convex ring platform matching the lower ring groove is provided on the upper side of the lower pressure ring.

4. The high temperature and high pressure thermal recovery flat gate valve according to claim 2 or 3, characterized in that The lower sealing assembly comprises an upper gasket, a packing assembly and a lower gasket which are arranged in sequence from top to bottom.

5. The high temperature and high pressure thermal recovery flat gate valve according to claim 4 is characterized in that It also includes an injection valve. A refueling hole that can communicate with the lower valve stem cavity is provided on the outer side of the valve cover corresponding to the position below the lower sealing assembly, and an injection valve is provided on the outer side of the valve cover corresponding to the position of the refueling hole.

6. The high-temperature and high-pressure thermal recovery flat gate valve according to claim 1, 2, 3 or 5, characterized in that The rotating connecting part includes a handwheel, an upper bearing, a lower bearing and a bearing cap. A stem nut with an upper end located above the stem seat is provided in the upper valve stem cavity, and a handwheel is fixedly installed on the outer side of the upper end of the stem nut; a supporting ring is provided on the outer side of the middle part of the valve plate nut, an upper bearing is provided between the stem nut and the stem seat corresponding to the position above the supporting ring, a lower bearing is provided between the stem nut and the stem seat corresponding to the position below the supporting ring, and a bearing cap is fixedly installed on the inner side of the upper end of the stem seat, the lower end of which is against the upper side of the upper bearing and is located on the outer side of the stem nut.

7. The high temperature and high pressure thermal recovery flat gate valve according to claim 4 is characterized in that The rotating connecting part includes a handwheel, an upper bearing, a lower bearing and a bearing cap. A stem nut with an upper end located above the stem seat is provided in the upper valve stem cavity, and a handwheel is fixedly installed on the outer side of the upper end of the stem nut; a supporting ring is provided on the outer side of the middle part of the valve plate nut, an upper bearing is provided between the stem nut and the stem seat corresponding to the position above the supporting ring, a lower bearing is provided between the stem nut and the stem seat corresponding to the position below the supporting ring, and a bearing cap is fixedly installed on the inner side of the upper end of the stem seat, the lower end of which is against the upper side of the upper bearing and is located on the outer side of the stem nut.

8. The high-temperature and high-pressure thermal recovery flat gate valve according to claim 1, 2, 3, 5 or 7, characterized in that The valve seat seal is a metal X-shaped sealing ring. A metal X-shaped sealing ring is provided between the left side of the left valve seat and the main valve body, and a metal X-shaped sealing ring is provided between the right side of the right valve seat and the main valve body.

9. The high temperature and high pressure thermal recovery flat gate valve according to claim 4 is characterized in that The valve seat seal is a metal X-shaped sealing ring. A metal X-shaped sealing ring is provided between the left side of the left valve seat and the main valve body, and a metal X-shaped sealing ring is provided between the right side of the right valve seat and the main valve body.

10. The high temperature and high pressure thermal recovery flat gate valve according to claim 6, characterized in that The valve seat seal is a metal X-shaped sealing ring. A metal X-shaped sealing ring is provided between the left side of the left valve seat and the main valve body, and a metal X-shaped sealing ring is provided between the right side of the right valve seat and the main valve body.

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