175MPa surface safety valve

Abstract

The invention relates to the technical field of safety valves, in particular to a 175MPa ground safety valve, which comprises a valve body, a valve cover, a connecting sleeve, a connecting joint, a shell and a hydraulic cylinder joint, a vertically through first mounting hole is formed in the middle of the valve cover, the valve body is fixedly mounted on the lower side of the valve cover, a horizontally through flow channel is formed in the middle of the valve body, and a mounting groove with an upward opening is formed in the middle of the valve body; a connecting sleeve is installed on the upper side of the valve deck, a shell is installed on the outer side of the upper end of the connecting sleeve, a limiting ring groove is formed in the upper side of the connecting sleeve, and a spring with the upper portion located in the shell is arranged in the limiting ring groove. The valve is reasonable and compact in structure and convenient to use, the valve is connected with the valve rod through the connector and the connecting rod, internal quick-wear parts can be replaced and maintained without disassembling the valve body and the valve cover, and the function that a giant spring is installed by a single person without the help of a special tool is achieved through the mode that the baffle is combined with the connector and the connecting rod.

Description

Technical Field

[0001] The invention relates to the technical field of safety valves and relates to a 175MPa ground safety valve. Background Art

[0002] There are many hidden dangers in the ground metering test of high-pressure wells, such as: abnormal high pressure in the pipeline causing overpressure explosion of equipment, corrosive gas erosion of equipment causing leakage of toxic gas, high temperature causing accelerated aging of equipment, etc. These conditions will cause immeasurable consequences to personnel and equipment. In order to achieve the safety and controllability of the entire ground metering process, by installing a ground safety valve upstream of the pipeline, the upstream pressure can be cut off in time at the initial stage of an accident, and the ejection of the output in the well can be controlled, which can effectively avoid risks and reduce losses.

[0003] As exploration and development advances to ultra-deep layers of 9,000m and 10,000m, the existing ground safety valves with a pressure-bearing performance of 140MPa can no longer meet the needs of ground testing. It is crucial to increase the pressure-bearing performance from 140MPa to 175MPa. Innovative designs are needed to improve the sealing reliability, emergency shutdown reliability, and ease of maintenance of ground safety valves. Summary of the invention

[0004] The present invention provides a 175MPa ground safety valve, which overcomes the shortcomings of the above-mentioned prior art and can effectively solve the problem that the existing ground safety valve with a pressure bearing performance of 140MPa is difficult to meet the needs of ground testing, as well as the problems of sealing reliability, emergency shutdown reliability, and ease of maintenance of the ground safety valve.

[0005] The technical solution of the present invention is achieved through the following measures: a 175MPa ground safety valve, including a valve body, a valve cover, a connecting sleeve, a connecting joint, a shell and a hydraulic cylinder joint, a first mounting hole penetrating from top to bottom is provided in the middle of the valve cover, a valve body is fixedly installed on the lower side of the valve cover, a flow channel penetrating from left to right is provided in the middle of the valve body, a mounting groove opening upward is provided in the middle of the valve body, the mounting groove is communicated with the flow channel, the first mounting hole is communicated with the mounting groove, a connecting sleeve is installed on the upper side of the valve cover, a shell is installed on the outer side of the upper end of the connecting sleeve, a limiting ring groove is provided on the upper side of the connecting sleeve, a spring with an upper part located in the shell is provided in the limiting ring groove, a T-shaped baffle is provided on the upper side of the spring, a second mounting hole penetrating from top to bottom is provided in the middle of the baffle, the connecting joint is cross-shaped, the upper seat of the connecting joint is on the upper side of the second mounting hole, and the lower part of the connecting joint is Located in the spring, a piston is mounted on the outer side of the upper part of the connecting joint, and a hydraulic cylinder joint is mounted on the outer side of the lower part and installed together with the shell body. A hydraulic hole connected to the inside and outside is provided on the upper part of the hydraulic cylinder joint, and a third mounting hole which passes through the upper and lower parts is provided in the middle part of the connecting joint. A connecting rod located in the spring is installed on the third mounting hole, and a valve stem which passes through the connecting sleeve and is located in the lower part of the first mounting hole is installed on the inner side of the lower part of the connecting rod. A valve plate whose lower end is located in the mounting groove is connected to the lower end of the valve stem. A first connecting hole which passes through the left and right parts is provided on the upper part of the valve plate, and a valve seat is seated in the mounting groove corresponding to the position of the flow channel. A second connecting hole which passes through the left and right parts is provided in the middle part of the valve seat, and the second connecting hole is connected to the flow channel. A fourth mounting hole which passes through the upper and lower parts is provided in the middle part of the valve seat, and the lower part of the valve plate is located in the fourth mounting hole and can block the second connecting hole.

[0006] The following are further optimizations and / or improvements to the above technical solutions: A square suspension nut may be installed at the lower end of the valve stem, and a T-shaped slot opening upward and penetrating front to back is provided at the upper portion of the valve plate, and the square suspension nut is located in the T-shaped slot.

[0007] The valve seat and valve plate can be made of 4130 material with mirror-grade surface finish and sprayed with tungsten carbide, and the valve stem is made of 725 material.

[0008] The above may also include a push rod and a short cap. A boss is integrally provided in the middle of the upper side of the hydraulic cylinder joint. A fifth mounting hole which passes through the middle of the hydraulic cylinder joint is provided. The push rod is in an inverted T shape. A pressure cover is mounted on the lower part of the push rod. The pressure cover is fixedly installed with the middle part of the upper side of the piston by bolts. The upper part of the push rod passes through the fifth mounting hole and is located above the hydraulic cylinder joint. A short cap is fixedly installed on the outer side of the upper end of the push rod, and the short cap can be threadedly connected with the boss.

[0009] The lower part of the shell body may be provided with at least one breathing hole which is connected inside and outside, and a breathing screw plug is provided in the breathing hole.

[0010] The above may also include a support plate, an inner ring groove is provided on the inner side of the lower end of the first mounting hole, a support plate is provided between the upper side of the valve seat and the top of the inner ring groove, and the lower part of the valve stem and the upper part of the valve plate are located on the inner side of the support plate.

[0011] The above-mentioned may also include sealing packing, packing spacer rings, and packing glands. The outer side of the valve stem corresponding to the upper position of the first mounting hole is provided with sealing packing, packing spacer rings, sealing packing and packing glands in sequence from bottom to top. The packing gland is threadedly connected to the inner side of the first mounting hole, and a sealing assembly is provided between the packing gland and the valve cover; a dust ring, two sealing rings and a wear-resistant ring are provided in sequence at upper and lower intervals between the inner side of the boss and the push rod, two sealing rings and a wear-resistant ring are provided in sequence at upper and lower intervals between the inner side of the hydraulic cylinder joint and the piston, a sealing gasket ring is provided between the valve cover and the valve body at the outer side of the corresponding mounting groove, and two energy storage sealing rings are provided at upper and lower intervals on the outer side of the upper part and the outer side of the lower part of the valve seat respectively.

[0012] The present invention has a reasonable and compact structure and is easy to use. It is connected to the valve stem through a connecting joint and a connecting rod. Internal wearing parts can be replaced and maintained without disassembling the valve body and the valve cover. Through the combination of the baffle plate, the connecting joint and the connecting rod, the function of a single person installing a giant spring without the aid of special tools can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0014] The codes in the accompanying drawings are: 1 is the valve body, 2 is the valve cover, 3 is the connecting sleeve, 4 is the shell, 5 is the hydraulic cylinder joint, 6 is the flow channel, 7 is the mounting groove, 8 is the limit ring groove, 9 is the spring, 10 is the baffle, 11 is the connecting joint, 12 is the piston, 13 is the hydraulic hole, 14 is the third mounting hole, 15 is the connecting rod, 16 is the valve stem, 17 is the valve plate, 18 is the first connecting hole, 19 is the valve seat, 20 is the second connecting hole, 21 is the square suspension nut, 22 is the push rod, 23 is the short cap, 24 is the boss, 25 is the pressure cover, 26 is the breathing screw plug, 27 is the inner ring groove, 28 is the support plate, 29 is the sealing packing, 30 is the packing spacer ring, 31 is the packing pressure cover, 32 is the dust ring, 33 is the sealing ring, 34 is the wear-resistant ring, 35 is the sealing gasket ring, and 36 is the energy storage sealing ring. DETAILED DESCRIPTION

[0015] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0016] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached 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.

[0017] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 As shown, the 175MPa ground safety valve includes a valve body 1, a valve cover 2, a connecting sleeve 3, a connecting joint 11, a shell 4 and a hydraulic cylinder joint 5. A first mounting hole is provided in the middle of the valve cover 2, and the valve body 1 is fixedly installed on the lower side of the valve cover 2. A flow channel 6 is provided in the middle of the valve body 1 and is connected to the left and right. A mounting groove 7 with an opening upward is provided in the middle of the valve body 1, and the mounting groove 7 is connected with the flow channel 6. The first mounting hole is connected with the mounting groove 7. A connecting sleeve 3 is installed on the upper side of the valve cover 2, and a shell 4 is installed on the outer side of the upper end of the connecting sleeve 3. A limiting ring groove 8 is provided on the upper side of the connecting sleeve 3, and a spring 9 whose upper part is located in the shell 4 is provided in the limiting ring groove 8. A T-shaped baffle 10 is provided on the upper side of the spring 9, and a second mounting hole is provided in the middle of the baffle 10 and is connected to the upper side. The connecting joint 11 is cross-shaped, and the upper part of the connecting joint 11 is seated on the upper side of the second mounting hole, and the lower part of the connecting joint 11 is located in the spring 9. The upper part of the connecting joint 11 is located outside the spring 9. A piston 12 is sleeved on the side, and a hydraulic cylinder joint 5 is sleeved on the outer side of the piston 12, and the outer side of the lower part is installed with the housing 4. A hydraulic hole 13 communicating with the inside and outside is provided on the upper part of the hydraulic cylinder joint 5. A third mounting hole 14 penetrating from top to bottom is provided in the middle of the connecting joint 11. A connecting rod 15 located at the lower part in the spring 9 is installed in the third mounting hole 14. A valve stem 16 located at the lower part of the first mounting hole after the lower end passes through the connecting sleeve 3 is installed on the inner side of the lower part of the connecting rod 15. A valve plate 17 with the lower end located in the mounting groove 7 is connected to the lower end of the valve stem 16. A first communicating hole penetrating from left to right is provided on the upper part of the valve plate 17. A valve seat 19 is seated in the mounting groove 7 corresponding to the position of the flow channel 6. A second communicating hole 20 penetrating from left to right is provided in the middle part of the valve seat 19. The second communicating hole 20 is communicated with the flow channel 6. A fourth mounting hole penetrating from top to bottom is provided in the middle part of the valve seat 19. The lower part of the valve plate 17 is located in the fourth mounting hole and can block the second communicating hole 20.

[0018] Working process of gate valve: inject hydraulic oil into the upper part of piston 12 through hydraulic hole 13, drive piston 12 downward, and then compress spring 9. Piston 12 pushes connecting joint 11, connecting rod 15, valve stem 16 to drive valve plate 17 to move downward until first connecting hole, second connecting hole 20 are connected with flow channel 6, thus opening gate valve. Once leakage occurs in high pressure process, hydraulic oil is discharged by installing pressure relief valve on hydraulic hole 13; spring 9 drives valve stem 16 and valve plate 17 to move upward rapidly, closing gate valve. Hydraulic hole 13 can be blocked by hexagonal pipe plug when not in working state.

[0019] According to requirements, the valve seat 19 is composed of two halves, the hydraulic cylinder joint 5 is threadedly connected to the housing 4 and fixed by a set screw, the housing 4 is threadedly connected to the connecting sleeve 3 and fixed by a set screw, the connecting joint 11 is threadedly connected to the connecting rod 15 and fixed by a locking screw, and the connecting rod 15 is threadedly connected to the valve stem 16.

[0020] During installation, the baffle 10 is placed on the spring 9, the connecting rod 15 is threadedly connected to the valve stem 16, the valve stem 16 is lifted to the highest point, and the connecting joint 11 is buckled with the connecting rod 15, and then the spring 9 is compressed by rotating the connecting joint 11 to complete the installation operation, thereby realizing the function of a single person installing the giant spring 9 without the aid of special tools.

[0021] The above 175MPa ground safety valve can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 As shown, a square floating nut 21 is installed at the lower end of the valve stem 16, and a T-shaped slot with an upward opening and a front-to-back through-hole is provided on the upper part of the valve plate 17, and the square floating nut 21 is located in the T-shaped slot. This connection method can ensure floating sealing, and according to the pressure of the fluid, the valve plate 17 is pushed against the valve seat 19 on the other side to achieve sealing, which reduces the processing accuracy and installation difficulty.

[0022] Embodiment 3: As attached Figure 1 As shown, the valve seat 19 and the valve plate 17 are made of 4130 material, with mirror-grade surface finish and sprayed with tungsten carbide, and the valve stem 16 is made of 725 material. The valve seat 19 and the valve plate 17 are made of 4130 material, which has wear resistance, corrosion resistance and low friction coefficient, and achieves a pressure bearing performance of 175MPa through metal rigid sealing; the valve stem 16 is made of 725 material to avoid sealing failure caused by corrosion of the valve stem 16 during long-term operation.

[0023] Embodiment 4: As attached Figure 1 As shown, it also includes a push rod 22 and a short cap 23. A boss 24 is integrally provided in the middle of the upper side of the hydraulic cylinder joint 5. A fifth mounting hole that passes through the middle of the hydraulic cylinder joint 5 is provided. The push rod 22 is in an inverted T shape. A pressure cover 25 is mounted on the lower part of the push rod 22. The pressure cover 25 is fixedly installed with the middle part of the upper side of the piston 12 by bolts. The upper part of the push rod 22 passes through the fifth mounting hole and is located above the hydraulic cylinder joint 5. A short cap 23 is fixedly installed on the outer side of the upper end of the push rod 22, and the short cap 23 can be threadedly connected with the boss 24.

[0024] When the hydraulic cylinder is abnormal and leaks oil, it needs to be locked forcibly, otherwise the spring 9 will reset and close automatically. Therefore, the push rod 22 can be pressed down to open the flow channel 6 in the valve body 1, and then the short cap 23 can be threadedly connected with the boss 24 to keep the valve body 1 normally open.

[0025] Embodiment 5: As attached Figure 1 As shown, at least one breathing hole is provided at the lower part of the housing 4, and a breathing screw plug 26 is provided in the breathing hole. By providing the breathing hole, the gas in the cavity is discharged when the piston 12 is compressed during the operation of the valve. In the non-operating state, the breathing screw plug 26 is installed to prevent sand and dust from entering.

[0026] Embodiment 6: As attached Figure 1 As shown, a support plate 28 is also included, an inner ring groove 27 is provided inside the lower end of the first mounting hole, a support plate 28 is provided between the upper side of the valve seat 19 and the top of the inner ring groove 27, and the lower part of the valve stem 16 and the upper part of the valve plate 17 are located inside the support plate 28. The support plate 28 is provided to ensure the centering degree of the valve plate 17 entering the valve cavity.

[0027] Embodiment 7: As attached Figure 1 As shown, it also includes a sealing packing 29, a packing spacer ring 30, and a packing gland 31. The outer side of the valve stem 16 corresponding to the upper position of the first mounting hole is provided with a sealing packing 29, a packing spacer ring 30, a sealing packing 29 and a packing gland 31 from bottom to top. The packing gland 31 is threadedly connected to the inner side of the first mounting hole, and a sealing assembly is provided between the packing gland 31 and the valve cover 2; a dust ring 32, two sealing rings 33 and a wear-resistant ring 34 are provided in sequence between the inner side of the boss 24 and the push rod 22, two sealing rings 33 and a wear-resistant ring 34 are provided in sequence between the inner side of the hydraulic cylinder joint 5 and the piston 12, a sealing gasket ring 35 is provided between the valve cover 2 and the valve body 1 at the outer side of the corresponding mounting groove 7, and two energy storage sealing rings 36 are provided at intervals on the upper and lower outer sides of the valve seat 19.

[0028] The sealing packing 29 is provided to seal the outside of the valve stem 16 to avoid fluid leakage. The valve seat 19 is installed with an energy storage sealing ring 36. When the pressure is lower than 100Psi, the sealing ring 33 elastically ensures the low-pressure floating sealing of the valve plate 17. The connecting joint 11, the connecting rod 15 and the valve stem 16 are connected in such a way that the internal sealing packing 29, the sealing assembly, the packing gland 31 and other wearing parts can be replaced and maintained without disassembling the valve body 1 and the valve cover 2.

[0029] The above technical features constitute the embodiments of the present invention, 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 175MPa ground safety valve, characterized in that It includes a valve body, a valve cover, a connecting sleeve, a connecting joint, a shell and a hydraulic cylinder joint. A first mounting hole that runs through from top to bottom is provided in the middle of the valve cover. The valve body is fixedly installed on the lower side of the valve cover. A flow channel that runs through from left to right is provided in the middle of the valve body. A mounting groove that opens upward is provided in the middle of the valve body. The mounting groove is connected with the flow channel, and the first mounting hole is connected with the mounting groove. A connecting sleeve is installed on the upper side of the valve cover. A shell is installed on the outer side of the upper end of the connecting sleeve. A limiting ring groove is provided on the upper side of the connecting sleeve. A spring whose upper part is located in the shell is provided in the limiting ring groove. A T-shaped baffle is provided on the upper side of the spring. A second mounting hole that runs through from top to bottom is provided in the middle of the baffle. The connecting joint is cross-shaped. The upper seat of the connecting joint is on the upper side of the second mounting hole. The lower part of the connecting joint is located in the spring. The upper outer side of the connecting joint is sleeved with The piston has a hydraulic cylinder joint mounted on the outer side of the lower part and installed together with the shell body, a hydraulic hole connected inside and outside is arranged on the upper part of the hydraulic cylinder joint, a third mounting hole penetrating up and down is arranged in the middle of the connecting joint, a connecting rod located in the spring is installed in the third mounting hole, a valve stem is installed on the inner side of the lower part of the connecting rod and the lower end passes through the connecting sleeve and is located in the lower part of the first mounting hole, a valve plate is connected to the lower end of the valve stem and the lower end is located in the mounting groove, a first connecting hole penetrating left and right is arranged on the upper part of the valve plate, a valve seat is seated in the mounting groove corresponding to the position of the flow channel, a second connecting hole penetrating left and right is arranged in the middle of the valve seat, the second connecting hole is connected to the flow channel, a fourth mounting hole penetrating up and down is arranged in the middle of the valve seat, the lower part of the valve plate is located in the fourth mounting hole and can block the second connecting hole.

2. The 175MPa ground safety valve according to claim 1, characterized in that A square floating nut is installed at the lower end of the valve stem, and a T-shaped slot with an opening facing upward and running through front and back is provided on the upper part of the valve plate, and the square floating nut is located in the T-shaped slot; or / and, the valve seat and valve plate are made of 4130 material, with mirror-grade surface finish, sprayed with tungsten carbide, and the valve stem is made of 725 material.

3. The 175MPa ground safety valve according to claim 1 or 2, characterized in that It also includes a push rod and a short cap. A boss is integrally provided in the middle of the upper side of the hydraulic cylinder joint. A fifth mounting hole that passes through the middle of the hydraulic cylinder joint is provided. The push rod is in an inverted T shape. A pressure cover is mounted on the lower part of the push rod. The pressure cover is fixed to the middle of the upper side of the piston by bolts. The upper part of the push rod passes through the fifth mounting hole and is located above the hydraulic cylinder joint. A short cap is fixedly installed on the outer side of the upper end of the push rod, and the short cap can be threadedly connected to the boss.

4. The 175MPa ground safety valve according to claim 1 or 2, characterized in that The lower part of the shell body is provided with at least one breathing hole which is connected inside and outside, and a breathing screw plug is arranged in the breathing hole.

5. The 175MPa ground safety valve according to claim 3, characterized in that The lower part of the shell body is provided with at least one breathing hole which is connected inside and outside, and a breathing screw plug is arranged in the breathing hole.

6. The 175MPa ground safety valve according to claim 1, 2 or 5, characterized in that It also includes a support plate, an inner ring groove is provided on the inner side of the lower end of the first mounting hole, a support plate is provided between the upper side of the valve seat and the top of the inner ring groove, and the lower part of the valve stem and the upper part of the valve plate are located on the inner side of the support plate.

7. The 175MPa ground safety valve according to claim 3, characterized in that It also includes a support plate, an inner ring groove is provided on the inner side of the lower end of the first mounting hole, a support plate is provided between the upper side of the valve seat and the top of the inner ring groove, and the lower part of the valve stem and the upper part of the valve plate are located on the inner side of the support plate.

8. The 175MPa ground safety valve according to claim 4, characterized in that It also includes a support plate, an inner ring groove is provided on the inner side of the lower end of the first mounting hole, a support plate is provided between the upper side of the valve seat and the top of the inner ring groove, and the lower part of the valve stem and the upper part of the valve plate are located on the inner side of the support plate.

9. The 175MPa ground safety valve according to claim 5, 7 or 8, characterized in that It also includes sealing packing, packing spacer ring, and packing gland. The outer side of the valve stem corresponding to the upper position of the first mounting hole is provided with sealing packing, packing spacer ring, sealing packing and packing gland in sequence from bottom to top, and the packing gland is threadedly connected to the inner side of the first mounting hole; a dust ring, two sealing rings and a wear-resistant ring are provided in sequence between the inner side of the boss and the push rod at upper and lower intervals, two sealing rings and a wear-resistant ring are provided in sequence between the inner side of the hydraulic cylinder joint and the piston at upper and lower intervals, a sealing gasket ring is provided between the valve cover and the valve body at the outer position of the corresponding mounting groove, and two energy storage sealing rings are provided at upper and lower intervals on the outer side of the upper part and the outer side of the lower part of the valve seat.

10. The 175MPa ground safety valve according to claim 3, characterized in that It also includes sealing packing, packing spacer ring, and packing gland. The outer side of the valve stem corresponding to the upper position of the first mounting hole is provided with sealing packing, packing spacer ring, sealing packing and packing gland in sequence from bottom to top. The packing gland is threadedly connected to the inner side of the first mounting hole, and a sealing assembly is provided between the packing gland and the valve cover; a dust ring, two sealing rings and a wear-resistant ring are provided in sequence at upper and lower intervals between the inner side of the boss and the push rod, two sealing rings and a wear-resistant ring are provided in sequence at upper and lower intervals between the inner side of the hydraulic cylinder joint and the piston, a sealing gasket ring is provided between the valve cover and the valve body at the outer side of the corresponding mounting groove, and two energy storage sealing rings are provided at upper and lower intervals on the outer side of the upper part and the outer side of the lower part of the valve seat respectively.

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