Integrated pilot operated safety valve for ultrahigh-pressure vibration working condition

Abstract

An integrated pilot operated safety valve for an ultrahigh-pressure vibration working condition comprises a main valve and a pilot valve which are connected through a pipeline. The main valve and the pilot valve share one valve body and are designed into an integrated structure, and connecting pipeline channels of the main valve, the pilot valve, the cavity and the like are all designed in the valve body; the upper portion of a valve clack of the main valve and the lower portion of a valve clack pressing plug are both designed to be of a spherical surface structure, so that the valve clack and the valve clack pressing plug have certain swing amount, and automatic alignment of the valve clack can be achieved when the valve returns to a seat. A guide sleeve ring and a guide sleeve of the main valve are designed in a split mode, and alignment connection of a medium channel and a main valve air chamber cavity can be adjusted conveniently after the guide sleeve is installed. Risks of looseness or leakage caused by frequent vibration of an external connecting pipeline and a connector are avoided, and reliability of the valve is enhanced.

Description

Technical Field

[0001] The invention relates to an integrated pilot-operated safety valve used in ultra-high pressure vibration working conditions, belonging to the field of overpressure protection devices. Background Art

[0002] Ultra-high pressure pilot valves are often used in typical situations such as overpressure protection of gas storage gas injection compressors, overpressure protection of oil field gas injection and oil production compressors, and overpressure protection of offshore platform compressors. Such high-pressure compressors usually require four to six stages of boosting to reach the required pressure, and each stage of the compressor outlet requires a safety valve for overpressure protection. The maximum pressure of the required pilot safety valve exceeds 100MPa.

[0003] Currently, in the field of high-pressure safety valves, there are only spring-type safety valves suitable for small compressors. However, due to the relatively limited displacement capacity, they are unable to meet the large flow rate requirements of high-pressure compressors. In addition, when faced with harsh working conditions where the working pressure is extremely close to the set pressure, the adaptability of spring-type safety valves is also insufficient. In the past, pilot-operated safety valves usually adopted an external pipe connection structure as the main valve, which resulted in limited pipe pressure under high pressure, easy loosening and leakage of pipes under vibration conditions, and easy breakage of joints. They were unable to meet the requirements of ultra-high pressure vibration conditions, and there was an urgent need for a more advanced and reliable innovative pilot-operated safety valve technology to lead a new round of technological innovation in the field of ultra-high pressure safety protection. Summary of the invention

[0004] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide an integrated pilot safety valve for ultra-high pressure vibration conditions, thereby solving the problem that conventional pilot safety valves are not suitable for ultra-high pressure vibration conditions due to limited external pipe pressure, and greatly expanding the application range of pilot safety valves.

[0005] The technical solution of the present invention is: an integrated pilot-operated safety valve for ultra-high pressure vibration working conditions, comprising: a main valve and a pilot valve, which are connected by a pipeline, wherein:

[0006] The main valve includes: valve body, valve seat, valve disc, valve disc plug, guide sleeve, main valve spring, guide sleeve ring, cover plate; the connection method of each structure in the main valve is:

[0007] The valve seat is installed in the valve body, the valve disc is screwed into the valve disc plug through the thread release type, the valve disc plug is installed in the guide sleeve, and the guide sleeve and guide sleeve ring are installed in the valve body in sequence; the main valve spring is located in the guide sleeve and the guide sleeve ring, one end is located in the valve disc plug, and the other end contacts the cover plate; the cover plate is pressed and fixed on the valve body to ensure the sealing between the valve seat and the valve body, and between the valve seat and the valve disc;

[0008] The pilot valve and the main valve share the same valve body. The pilot valve also includes: valve body, valve cover joint, valve cover, valve bonnet, adjustment screw, pilot valve spring, outlet valve seat, valve shaft, inlet valve seat, feedback piston, piston sleeve; the connection method of each structure in the pilot valve is:

[0009] The valve cover joint is fixed on the valve body through threads; the valve cover is fixed on the valve cover joint; the pilot valve spring is located inside the valve cover, one end of the pilot valve spring acts on the feedback piston through the spring seat, and the other end of the pilot valve spring is connected to the lower end of the adjusting screw through the spring seat; the valve cap is fixed above the adjusting screw; the adjusting screw is set on the upper part of the valve cover and inside the valve cap;

[0010] The outlet valve seat, valve shaft, inlet valve seat, feedback piston and piston sleeve are located in the valve body, wherein the piston sleeve is sleeved on the periphery of the feedback piston, the inlet valve seat and the outlet valve seat are arranged in sequence at the lower end of the feedback piston, and the valve shaft passes through the outlet valve seat and the inlet valve seat from bottom to top;

[0011] The pipeline includes a first channel, a second channel and a third channel, wherein the first channel connects the main valve inlet and the pilot valve inlet; the second channel connects the inlet valve seat of the pilot valve and the main valve air chamber cavity; the third channel connects the pilot valve outlet and the main valve outlet; wherein: the main valve inlet is located below the valve seat, the main valve outlet is located on the valve body, the pilot valve inlet is located below the valve shaft, the pilot valve outlet is located on the outlet valve seat and connected to the main valve outlet; the main valve air chamber cavity is a cavity composed of a guide sleeve, a guide sleeve ring, a valve disc press plug and a cover plate.

[0012] Preferably, the upper part of the valve flap and the lower part of the valve flap plug are both designed to be spherical structures. The valve flap plug adopts a large sphere and the valve flap adopts a relatively small sphere, so that the valve flap and the valve flap plug have a certain amount of swing, which is used for automatic alignment of the valve flap when the valve returns to its seat.

[0013] Preferably, the valve body and the guide sleeve, the guide sleeve ring, and the valve disc press plug and the guide sleeve are sealed by O-rings.

[0014] Preferably, the pipelines where the first channel, the second channel and the third channel are located are all arranged inside the valve body.

[0015] Preferably, four through holes are designed at the position where the inlet valve seat communicates with the second channel of the valve body, and during installation, one of the through holes is aligned with the second channel of the valve body through simple adjustment.

[0016] Preferably, a through hole is designed on the guide sleeve ring for aligning and connecting with the second channel, and the guide sleeve ring and the guide sleeve are designed to be separated, so as to facilitate adjustment of the alignment and connection between the second channel and the main valve air chamber cavity after the guide sleeve is installed.

[0017] Preferably, the main valve utilizes the medium pressure and forms a metal-to-metal self-sealing structure through the area difference between below the valve disc and above the valve disc press plug.

[0018] Preferably, there is an opening height limit structure design between the valve disc pressure plug and the guide sleeve in the main valve structure: the valve disc pressure plug and the guide sleeve adopt a step-type structure combination, when the valve is closed, there is a certain distance between the step surfaces of the valve disc pressure plug and the guide sleeve, when the valve is open, the two step surfaces are in contact, and the distance when closed is the valve opening height; the high limit structure design makes it possible to adjust the height of the limit structure by adjusting the throat diameter of the integrated pilot safety valve within a certain range of the valve opening height.

[0019] Preferably, the guide sleeve acts directly on the valve seat, and the valve seat and valve disc both cooperate with the guide section of the guide sleeve inner hole. The guide sleeve inner hole and the valve seat and valve disc cooperate with the guide section for one-time processing, which ensures the guidance and centering of the main valve and realizes good sealing of the valve under high pressure.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] In response to the overpressure protection needs in the field of ultra-high pressure vibration conditions, the present invention solves the pressure-bearing and vibration problems faced by the high-pressure pilot valve through the integrated structural design of the main valve, special piping design, main sealing structure design, and split guide sleeve design, improves the sensitivity of the main valve response, the reliability of action and sealing, reduces the complexity of installation, and successfully realizes the application of the pilot valve in the field of ultra-high pressure vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a conventional pilot-operated safety valve;

[0023] Figure 2 It is a schematic diagram of an integrated pilot-operated safety valve for ultra-high pressure vibration conditions;

[0024] Figure 3 This is a schematic diagram of the automatic disc alignment solution;

[0025] Figure 4 It is a schematic diagram of the split guide sleeve solution. DETAILED DESCRIPTION

[0026] An integrated pilot-operated safety valve for ultra-high pressure vibration conditions is mainly composed of a main valve and a pilot valve, and has the following three characteristics:

[0027] 1) Integrated structure of main valve and special pipeline design:

[0028] Since the compressor vibrates frequently and the pressure is extremely high during operation, higher requirements are placed on the connection pipes and joints of the high-pressure pilot valve in terms of pressure bearing and vibration resistance. Once loosened and leaking, it is very easy to cause a shutdown accident. The connection pipes and joints of conventional pilot safety valves are set outside the valve, while the integrated pilot safety valve for ultra-high pressure vibration conditions has an integrated structure design for the main valve and the pilot valve. The main valve and the pilot valve share a valve body, and the connection pipe channels of the main valve, the pilot valve, the chamber and other parts are designed inside the valve body. Compared with conventional pilot safety valves (such as Figure 1 This structure not only saves costs and installation space, but also greatly improves safety. In addition, the integrated structure design solves the problem of limited pressure bearing of the connecting pipes and joints between the main valve and the pilot valve. The pressure bearing capacity is consistent with the valve body, meeting the requirements of ultra-high pressure conditions. At the same time, it also avoids the risk of loosening or leakage of external connecting pipes and joints under frequent vibration, enhancing the reliability of the valve. The structure of the integrated pilot safety valve for ultra-high pressure vibration conditions is shown in Figure 1. Figure 2 shown.

[0029] The main valve connection pipelines of the integrated pilot-operated safety valve for ultra-high pressure vibration conditions are designed inside the main valve body ( Figure 2 ), the pipeline consists of a first channel, a second channel and a third channel. The first channel consists of two sections of horizontal and vertical channels, and its function is to connect the main valve inlet and the pilot valve inlet; the second channel is an oblique channel, and its function is to connect the inlet valve seat 16 of the pilot valve and the main valve air chamber cavity; the third channel is a horizontal channel, and its function is to connect the pilot valve outlet and the main valve outlet; wherein: the main valve inlet is located below the valve seat 2, the main valve outlet is located on the valve body 1, the pilot valve inlet is located below the valve shaft 15, the pilot valve outlet is located on the outlet valve seat 14, and the main valve air chamber cavity is a cavity composed of a guide sleeve 5, a guide sleeve ring 7, a valve disc press plug 4 and a cover plate 8. Before the system pressure reaches the set point, the system pressure enters the valve shaft 15 through the first channel through the main valve inlet, flows into the second channel through the channel between the outlet valve seat 16 and the piston sleeve 18, and communicates with the main valve air chamber cavity. Four through holes are designed at the position where the inlet valve seat 16 communicates with the second channel of the valve body 1. During installation, the position of the through hole of the inlet valve seat 16 can be aligned with the second channel of the valve body 1 through simple adjustment, so that the system pressure can enter the main valve air chamber cavity in time. At this time, the pressure between the main valve inlet and the main valve air chamber cavity is the same. Because there is a sealing area difference between the main valve inlet and the main valve air chamber cavity, the main valve is sealed. When the main valve inlet pressure reaches the set pressure, the pilot valve opens, and the main valve air chamber cavity pressure enters the pilot valve from the outlet valve seat 16 through the second channel into the pilot valve channel composed of the outlet valve seat 16 and the valve shaft 15, and then is discharged from the main valve outlet through the third channel. At this time, the air chamber cavity pressure is reduced, and the medium force on the upper part of the main valve disc pressure plug 4 is lower than the medium force on the lower part. At this time, the main valve disc pressure plug 4 moves upward, and the main valve opens.

[0030] The first channel, the second channel and the third channel are shorter in length inside the valve body, have fewer bends and a shorter process, the pressure reduction speed of the main valve air chamber cavity is fast, and the main valve responds quickly when opening and closing.

[0031] 2) Main sealing structure design: By rationally designing the structure of the contact area between the valve disc plug 4 and the valve disc 3, the reliability of its operation can be improved. The upper part of the valve disc 3 and the lower part of the valve disc plug 4 are both designed as spherical structures. The contact surface between the lower part of the valve disc plug 4 and the upper part of the valve disc 3 is a high-finish double-spherical design. The valve disc plug 4 uses a large spherical surface, and the valve disc 3 uses a relatively small spherical surface. This structure allows the valve disc 3 and the valve disc plug 4 to have a certain amount of swing, which can realize the automatic alignment of the valve disc 3 when the valve returns to its seat. This design is beneficial to the swing of the valve disc 3 and the centering of the overall structure, and improves the stability of the structure. The specific structural scheme is as follows: Figure 3 As shown:

[0032] 3) Split guide sleeve design: The conventional guide sleeve integrated structure is designed into a split structure of guide sleeve ring 7 and guide sleeve 5. The upper end is designed as guide sleeve ring 7. A through hole is designed on the guide sleeve ring 7 for alignment and connection with the second channel. The guide sleeve ring 7 and guide sleeve 5 are designed to be split, which is convenient for adjusting the alignment and connection between the second channel and the main valve air chamber cavity after the guide sleeve 5 is installed. The position is easy to adjust, which solves the problem of alignment between the main valve air chamber cavity and the pilot valve air path; it is also easy to install and adjust, and saves processing costs. The lower end guide sleeve is used in conjunction with the valve seat guide surface to ensure good alignment of the valve body, valve disc plug 4, valve disc 3, and valve seat 2, thereby ensuring excellent sealing effect of the main valve. For specific solutions, see Figure 4 .

[0033] like Figure 2 As shown, an integrated pilot safety valve for ultra-high pressure vibration working conditions is composed of a main valve and a pilot valve. The main valve is composed of a valve body 1, a valve seat 2, a valve disc 3, a valve disc press plug 4, a guide sleeve 5, a main valve spring 6, a guide sleeve ring 7, a cover plate 8 and other parts. After the main valve parts are installed, the cover plate 8 is connected to the main valve body 1 by bolts. The valve seat 2 is installed in the valve body 1, the valve disc 3 is screwed in the valve disc press plug 4 by a thread release type, the valve disc press plug 4 is installed in the guide sleeve 5, the guide sleeve 5, the guide sleeve ring 7 and the main valve spring 6 are installed in the valve body 1 in sequence, the main valve spring 6 is located in the guide sleeve 5 and the guide sleeve ring 7, one end is installed in the valve disc press plug 4, and the other end contacts the cover plate 8; the cover plate 8 is tightened and fixed on the valve body 1 by bolt connection to ensure the sealing between the valve seat 2 and the valve body 1, and between the valve seat 2 and the valve disc 3. The valve body 1 and the guide sleeve 5, the guide sleeve ring 7, and the valve disc press plug 4 and the guide sleeve 5 are sealed by O-rings.

[0034] Since this structure is a main valve integrated structure, the main valve body is the pilot valve body, and the pilot valve is mainly composed of a valve body 1, a valve cover joint 10, a valve cover 9, a valve bonnet 12, an adjusting screw 13, a pilot valve spring 11, an outlet valve seat 14, a valve shaft 15, an inlet valve seat 16, a feedback piston 17, a piston sleeve 18, etc. The valve cover joint 10 is fixed on the valve body 1 by threads; the valve cover 9 is fixed on the valve cover joint 10 by threads, the pilot valve spring 11 is located inside the valve cover 9, one end of the pilot valve spring 11 acts on the feedback piston 17 through a spring seat, and the other end of the pilot valve spring 11 is connected to the lower end of the adjusting screw 13 through a spring seat; the valve bonnet 12 is fixed above the adjusting screw 13; the adjusting screw 13 is arranged on the upper part of the valve cover 9 and inside the valve bonnet 12. The outlet valve seat 14, the valve shaft 15, the inlet valve seat 16, the feedback piston 17, and the piston sleeve 18 are installed in the valve body 1, wherein the valve shaft 15, the feedback piston 17 and the piston sleeve 18 are connected by threads. Specifically, the piston sleeve 18 is sleeved on the periphery of the feedback piston 17, and the inlet valve seat 16 and the outlet valve seat 14 are sequentially arranged at the lower end of the feedback piston 17, and the valve shaft 15 passes through the outlet valve seat 14 and the inlet valve seat 16 from bottom to top.

[0035] The main seal of a conventional pilot-operated safety valve generally adopts a non-metallic soft seal made of fluoroplastic or rubber material; under ultra-high pressure vibration conditions, the pilot-operated safety valve has higher requirements in terms of long-term sealing performance and anti-scouring performance. Therefore, the ultra-high pressure pilot-operated safety valve uses the medium pressure and forms a metal-to-metal self-sealing structure through the area difference between the bottom of the valve disc (3) and the top of the valve disc plug (4). This structure has better long-term sealing and anti-scouring capabilities under high pressure conditions than non-metallic soft seals and has a longer service life. Figure 4 .

[0036] In the main valve structure, there is an opening height limit structure design between the valve disc pressure plug 4 and the guide sleeve 5. Figure 4 The valve disc pressure plug 4 and the guide sleeve 5 adopt a stepped structure combination. When the valve is closed, there is a certain distance between the valve disc pressure plug 4 and the guide sleeve 5 step surface. When the valve is opened, the two step surfaces are in contact. The distance when closed is the valve opening height. This opening height limit structure design can ensure that the valve opening height is within a certain range. The limit structure height can be adjusted by adjusting the throat diameter of the integrated pilot safety valve.

[0037] The guide sleeve 5 acts directly on the valve seat 2. The valve seat 2 and the valve disc 3 are matched with the guide section of the inner hole of the guide sleeve 5. The inner hole of the guide sleeve 5 and the guide section of the valve seat 2 and the valve disc 3 are formed in one process. This structure ensures the excellent guidance and centering of the main valve and can achieve good sealing of the valve under high pressure. Figure 4 .

[0038] According to the market demand for overpressure protection of high-pressure compressors, the present invention has made structural innovations in the integrated structural design of the main valve, the special pipeline structure design, the main sealing structure design, and the split guide sleeve structure design. This valve type can be suitable for ultra-high pressure vibration conditions.

[0039] The contents not described in detail in the specification of the present invention belong to the prior art known to the professional and technical personnel in this field.

Claims

1. An integrated pilot-operated safety valve for ultra-high pressure vibration conditions, characterized in that include: The main valve and the pilot valve are connected by pipelines, wherein: The main valve comprises: a valve body (1), a valve seat (2), a valve disc (3), a valve disc pressing plug (4), a guide sleeve (5), a main valve spring (6), a guide sleeve ring (7), and a cover plate (8); the connection method of each structure in the main valve is as follows: The valve seat (2) is installed in the valve body (1), the valve disc (3) is screwed into the valve disc plug (4) by means of a threaded release, the valve disc plug (4) is installed in the guide sleeve (5), the guide sleeve (5) and the guide sleeve ring (7) are installed in the valve body (1) in sequence; the main valve spring (6) is located in the guide sleeve (5) and the guide sleeve ring (7), one end of which is located in the valve disc plug (4) and the other end of which contacts the cover plate (8); the cover plate (8) is pressed and fixed on the valve body (1) to ensure sealing between the valve seat (2) and the valve body (1) and between the valve seat (2) and the valve disc (3); The pilot valve and the main valve share a valve body (1), and the pilot valve further comprises: a valve body (1), a valve cover joint (10), a valve cover (9), a valve cap (12), an adjustment screw (13), a pilot valve spring (11), an outlet valve seat (14), a valve shaft (15), an inlet valve seat (16), a feedback piston (17), and a piston sleeve (18); the connection method of each structure in the pilot valve is as follows: The valve cover joint (10) is fixed on the valve body (1) by means of threads; the valve cover (9) is fixed on the valve cover joint (10); the pilot valve spring (11) is located inside the valve cover (9), one end of the pilot valve spring (11) acts on the feedback piston (17) through a spring seat, and the other end of the pilot valve spring (11) is connected to the lower end of the adjustment screw (13) through the spring seat; the valve cap (12) is fixed above the adjustment screw (13); the adjustment screw (13) is arranged on the upper part of the valve cover (9) and inside the valve cap (12); An outlet valve seat (14), a valve shaft (15), an inlet valve seat (16), a feedback piston (17), and a piston sleeve (18) are located in a valve body (1), wherein the piston sleeve (18) is sleeved around the feedback piston (17), the inlet valve seat (16) and the outlet valve seat (14) are arranged in sequence at the lower end of the feedback piston (17), and the valve shaft (15) passes through the outlet valve seat (14) and the inlet valve seat (16) from bottom to top; The pipeline comprises a first channel, a second channel and a third channel, wherein the first channel connects the main valve inlet and the pilot valve inlet; the second channel connects the inlet valve seat (16) of the pilot valve and the main valve air chamber cavity; the third channel connects the pilot valve outlet and the main valve outlet; wherein: the main valve inlet is located below the valve seat (2), the main valve outlet is located on the valve body (1), the pilot valve inlet is located below the valve shaft (15), the pilot valve outlet is located on the outlet valve seat (14) and connected to the main valve outlet; the main valve air chamber cavity is a cavity composed of a guide sleeve (5), a guide sleeve ring (7), a valve disc press plug (4) and a cover plate (8).

2. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: The upper part of the valve disc (3) and the lower part of the valve disc pressure plug (4) are both designed to be spherical structures. The valve disc pressure plug (4) adopts a large spherical surface, and the valve disc (3) adopts a relatively small spherical surface, so that the valve disc (3) and the valve disc pressure plug (4) have a certain amount of swing, which is used for automatic alignment of the valve disc (3) when the valve returns to its seat.

3. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: The valve body (1) and the guide sleeve (5), the guide sleeve ring (7), and the valve disc pressure plug (4) and the guide sleeve (5) are sealed by O-rings.

4. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: The pipelines where the first channel, the second channel and the third channel are located are all arranged inside the valve body (1).

5. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: Four through holes are designed at the position where the inlet valve seat (16) communicates with the second channel of the valve body (1). During installation, one of the through holes is aligned with the second channel of the valve body (1) through simple adjustment.

6. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: A through hole is designed on the guide sleeve ring (7) for aligning and connecting with the second channel. The guide sleeve ring (7) and the guide sleeve (5) are designed as separate parts, which facilitates the adjustment of the alignment of the second channel with the main valve air chamber after the guide sleeve (5) is installed.

7. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: The main valve utilizes the medium pressure and forms a metal-to-metal self-sealing structure through the area difference between the bottom of the valve disc (3) and the top of the valve disc pressing plug (4).

8. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: In the main valve structure, a high limit structure is designed between the valve disc pressure plug (4) and the guide sleeve (5): the valve disc pressure plug (4) and the guide sleeve (5) are combined in a stepped structure, and when the valve is closed, there is a certain distance between the step surfaces of the valve disc pressure plug (4) and the guide sleeve (5). When the valve is opened, the two step surfaces are in contact, and the distance when closed is the valve opening height; the high limit structure design enables the valve opening height to be within a certain range, and the height of the limit structure can be adjusted by adjusting the throat diameter of the integrated pilot safety valve.

9. The integrated pilot-operated safety valve for ultra-high pressure vibration conditions according to claim 1, characterized in that: The guide sleeve (5) acts directly on the valve seat (2), and the valve seat (2) and the valve disc (3) are both matched with the guide section of the inner hole of the guide sleeve (5). The inner hole of the guide sleeve (5) and the matching guide section of the valve seat (2) and the valve disc (3) are formed in one process, thereby ensuring the guidance and centering of the main valve and achieving good sealing of the valve under high pressure.

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