Safety valve on-line verification connecting device and safety valve on-line verification system

Abstract

The utility model discloses a safety valve on-line verification connecting device and a safety valve on-line verification system, the safety valve on-line verification connecting device comprises a central connecting rod, a sleeve and a limiting piece, the central connecting rod is detachably connected with the top of a safety valve rod; the sleeve is detachably connected with the top of the safety valve and covers the outer side of the top of a valve rod of the safety valve, and a first threaded hole is formed in the center of the top of the sleeve; the limiting piece is used for limiting the lifting height of the valve rod, a first through hole is formed in the center of the limiting piece, a first external thread is arranged on the outer circle of the limiting piece, the center connecting rod penetrates through the first through hole and is in clearance fit with the first through hole, and the first external thread is connected with the first threaded hole. According to the utility model, the on-line setting pressure measurement of the safety valve can be realized through a simple structure, the opening height can be limited, the opening can be forcibly closed to realize the seating function, and the labor intensity of on-line verification is greatly reduced.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to online calibration technology for safety valves. Background Technology

[0002] The online calibration device for safety valves is a commonly used testing device. Its operation involves connecting the structure to the valve stem of the safety valve, applying an upward lifting force to the valve stem, causing the safety valve to slightly open before reaching the opening pressure, measuring the additional force, converting it into the increased system pressure based on the effective working area of ​​the safety valve, and then converting it into the opening pressure of the safety valve.

[0003] Existing online safety valve calibration technology requires complex on-site disassembly of the valve cap and lifting nut, involving numerous components. The complex on-site conditions necessitate sufficient personnel and equipment for disassembly and assembly, significantly increasing the workload for online safety valve calibration. Furthermore, the online testing environment is unsuitable for prolonged operation. Since the safety valve is in operation, existing online calibration devices cannot limit the opening height or force closure, posing a risk of excessive opening or failure to reseat during testing. Such occurrences would severely impact the normal operation of the protected equipment. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a safety valve online calibration connection device and a safety valve online calibration system, which solves the problem that the opening height of the safety valve cannot be controlled during the existing safety valve online calibration process.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] First, an online calibration connection device for safety valves is provided, comprising:

[0007] A central connecting rod, which is detachably connected to the top of the safety valve stem;

[0008] A sleeve is detachably connected to the top of the safety valve and covers the outside of the top of the safety valve stem. A first threaded hole is provided at the center of the top of the sleeve.

[0009] A limiting component is provided, wherein the limiting component has a first through hole at its center and a first external thread on its outer circle, the central connecting rod passes through the first through hole and is clearance-fitted with the first through hole, the first external thread is connected to the first threaded hole, and a limiting structure is provided between the limiting component and the central connecting rod to limit the lifting height of the valve stem.

[0010] Preferably, the central connecting rod is threadedly connected to the safety valve stem.

[0011] Preferably, the lower end of the central connecting rod is provided with a first connecting hole and at least two second threaded holes distributed circumferentially. The first connecting hole is sleeved on the top of the safety valve stem, and the second threaded holes are connected to a first radial screw, which locks the central connecting rod to the valve stem.

[0012] Preferably, the lower end of the central connecting rod is provided with a flange portion, and the first connecting hole is formed in the flange portion.

[0013] Preferably, the top of the flange portion is provided with a first limiting surface, and the bottom of the limiting member is provided with a second limiting surface that cooperates with the first limiting surface to form a limiting structure.

[0014] Preferably, the sleeve is threaded to the top of the safety valve.

[0015] Preferably, the bottom of the sleeve has at least two third threaded holes spaced apart circumferentially, the bottom of the sleeve is provided with a second connecting hole, the second connecting hole is sleeved on the top of the safety valve, and the third threaded holes are connected to a second radial screw, which locks the sleeve and the top of the safety valve together.

[0016] In addition, an online safety valve calibration system is provided, including the aforementioned online safety valve calibration connection device and the online safety valve calibration component. The online safety valve calibration component is sleeved on the upper part of the central connecting rod, and its bottom abuts against the limiting member.

[0017] Furthermore, the online calibration component of the safety valve includes a hydraulic cylinder, a pressure sensor, and a locking element. The hydraulic cylinder abuts against the limiting element, the locking element is fixed to the upper part of the central connecting rod, and the pressure sensor is located between the hydraulic cylinder and the locking element.

[0018] Preferably, the locking component is a locking nut, which is threadedly connected to the upper part of the central connecting rod.

[0019] The technical solution adopted in this utility model, for an open safety valve, firstly selects a central connecting rod with a thread that matches the valve stem of the safety valve, and fixes the central connecting rod to the top of the valve stem through a threaded connection; then selects a sleeve with a thread that matches the top thread of the safety valve, and fixes it to the top of the safety valve through an external thread connection at the bottom of the sleeve; then connects the limiting member to the inside of the sleeve through a threaded connection, with the external thread at the bottom of the limiting member matching the internal thread at the top of the sleeve; the central connecting rod passes through the limiting member and has a clearance fit with the limiting member.

[0020] Therefore, by selecting center connecting rods with different thread specifications to match the valve stem thread, and sleeves with different specifications to match the thread of the opening at the top of the safety valve, it is not necessary to disassemble the safety valve cap on site.

[0021] For a closed-type safety valve, first remove the valve cap, select a suitable-sized center connecting rod, insert the first connecting hole at the lower end of the center connecting rod into the upper end of the safety valve stem, and tighten the first radial screw to effectively connect the valve stem and the center connecting rod; next, select a suitable sleeve and fix the sleeve to the safety valve cover through the bottom internal thread or the second radial screw connected to the bottom of the sleeve; then connect the limiting member to the sleeve through the thread and adjust the limiting member and the center connecting rod to a suitable distance, with the center connecting rod passing through the limiting member and having a clearance fit with the limiting member.

[0022] After connecting the safety valve online calibration connection device to the safety valve, connect the safety valve online calibration connection device to the safety valve online calibration component. The hydraulic cylinder abuts against the limiting component, the locking nut is threaded to the upper part of the central connecting rod, and the pressure sensor is located between the hydraulic cylinder and the locking nut. The hydraulic cylinder applies an upward lifting force to the locking nut, thereby driving the central connecting rod and the safety valve stem to lift, thus opening the safety valve. The pressure sensor can measure the lifting force, and based on this force, the safety valve's set pressure can be determined through data analysis, enabling online measurement of the safety valve's set pressure. This allows for online calibration of spring-loaded safety valves.

[0023] To improve the control of the safety valve's opening height during online calibration, a limiting component is installed to restrict the valve stem's lifting height. A first threaded hole is located at the center of the top of the sleeve, and a first external thread is located on the outer circumference of the limiting component. The external thread connects to the first threaded hole, allowing adjustment of the relative height between the limiting component and the central connecting rod via the thread. The second limiting surface at the bottom of the limiting component engages with the first limiting surface at the top of the flange at the lower end of the central connecting rod. This effectively controls the safety valve's opening height, reducing media discharge loss after opening. If the valve fails to reseat after opening, the forced reseat function can be achieved by adjusting the height of the central connecting rod and the limiting component to 0.

[0024] Therefore, it has the following beneficial effects: safety valves of different specifications can be connected to the safety valve online calibration component by using the safety valve online calibration connection device, so as to realize the online testing of safety valves.

[0025] This invention eliminates the need to disassemble the valve cap, enabling online pressure measurement of safety valves through a simple structure. It also allows for limiting the opening height and forcibly closing and opening to achieve reseating, greatly reducing the labor intensity of online calibration, mitigating the risk of production accidents caused by testing, and reducing the impact of adverse environments on human health. Especially for online calibration of large-diameter safety valves with complex installation positions, it significantly reduces calibration time and effectively improves inspection efficiency.

[0026] The specific technical solution and beneficial effects of this utility model will be described in detail below with reference to the accompanying drawings. Attached Figure Description

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0028] Figure 1 This is a schematic diagram of the online safety valve calibration system provided in this embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of one type of connection structure between the valve stem and the central connecting rod;

[0030] Figure 3 This is a schematic diagram of one type of connection structure between the valve stem and the central connecting rod;

[0031] Figure 4 This is a schematic diagram of one type of connection structure between the sleeve and the safety valve;

[0032] The following numbers are used in the diagram: 1-Central connecting rod; 11-Flange; 111-First connecting hole; 12-First limiting surface; 13-Second threaded hole; 14-First radial screw; 2-Locking nut; 3-Pressure sensor; 4-Hydraulic cylinder; 5-Limiting component; 51-First through hole; 52-First external thread; 6-Sleeve; 61-First threaded hole; 62-Second connecting hole; 63-Third threaded hole; 64-Second radial screw; 7-Safety valve; 71-Valve stem. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0034] Please see Figure 1 As shown, an online safety valve calibration system includes an online safety valve calibration connection device and an online safety valve calibration component. The online safety valve calibration connection device is used to connect to the safety valve 7 and the online safety valve calibration component, and includes:

[0035] Central connecting rod 1, which is detachably connected to the top of the safety valve stem;

[0036] Sleeve 6, which is detachably connected to the top of the safety valve and covers the outside of the top of the safety valve stem 71, and the top center of the sleeve has a first threaded hole 61.

[0037] The limiting component 5 has a first through hole 51 at its center and a first external thread 52 on its outer circle. The central connecting rod 1 passes through the first through hole 51 and is clearance-fitted with the first through hole. The first external thread 52 is connected to the first threaded hole 61. A limiting structure is provided between the limiting component 5 and the central connecting rod 1 to limit the lifting height of the valve stem.

[0038] The safety valve online calibration component is fitted onto the upper part of the central connecting rod, and its bottom abuts against the limiting component.

[0039] The safety valve online calibration component includes a hydraulic cylinder 4, a pressure sensor 3, and a locking component. The locking component is a locking nut 2. The hydraulic cylinder 4 abuts against the limiting component. The locking nut 2 is threadedly connected to the upper part of the central connecting rod. The pressure sensor 3 is located between the hydraulic cylinder 4 and the locking nut 2.

[0040] like Figure 2 As shown, in some embodiments, the central connecting rod 1 is threadedly connected to the safety valve stem 71, specifically, the lower end of the central connecting rod 1 is threadedly connected to the valve stem through a threaded hole.

[0041] like Figure 3 As shown, in some embodiments, the lower end of the central connecting rod has a first connecting hole 111 at its center and at least two second threaded holes 13 spaced apart circumferentially. The first connecting hole 111 is fitted onto the top of the safety valve stem, and the second threaded holes 13 are connected to a first radial screw 14, which locks the central connecting rod to the valve stem. Furthermore, the lower end of the central connecting rod has a flange portion 11, the first connecting hole 111 is located in the flange portion 111, the top of the flange portion has a first limiting surface 12, and the bottom of the limiting member has a second limiting surface that engages with the first limiting surface to form a limiting structure.

[0042] In some embodiments, the sleeve is threaded to the top of the safety valve, and the internal and external threads between the two can be configured as needed.

[0043] like Figure 4 As shown, in some embodiments, the bottom of the sleeve has at least two third threaded holes 63 spaced apart circumferentially, the bottom of the sleeve has a second connecting hole 62, the second connecting hole is fitted onto the top of the safety valve, and the third threaded hole is connected to a second radial screw 64, which locks the sleeve and the top of the safety valve together.

[0044] The connection method between the central connecting rod and the top of the safety valve stem, as well as the connection method between the sleeve and the top of the safety valve, varies depending on the type of safety valve, i.e., open safety valve or closed safety valve.

[0045] Method 1: For an open-type safety valve, the central connecting rod is threadedly connected to the safety valve stem, and the sleeve is threadedly connected to the top of the safety valve. First, a central connecting rod with a thread matching the safety valve stem is selected and fixed to the top of the stem via threaded connection. Then, a sleeve with a thread matching the top thread of the safety valve is selected and fixed to the top of the safety valve via the external thread at the bottom of the sleeve. Next, a limiting member is threaded to the inside of the sleeve, with the external thread at the bottom of the limiting member matching the internal thread at the top of the sleeve. The central connecting rod passes through the limiting member and has a clearance fit with it. Therefore, by selecting central connecting rods with different thread specifications to match the valve stem thread, and sleeves with different specifications to match the thread of the opening at the top of the safety valve, it is not necessary to disassemble the safety valve cap on-site.

[0046] Method 2: For a closed-type safety valve, first remove the valve cap, select a suitable-sized center connecting rod, insert the first connecting hole at the lower end of the center connecting rod into the upper end of the safety valve stem, and tighten the first radial screw to effectively connect the valve stem and the center connecting rod. Next, select a suitable sleeve and fix the sleeve to the safety valve cover through the bottom internal thread or the second radial screw connected to the bottom of the sleeve. Then, connect the limiting member to the sleeve through the thread and adjust the limiting member and the center connecting rod to a suitable distance, with the center connecting rod passing through the limiting member and having a clearance fit with the limiting member.

[0047] After the connecting device is connected to the safety valve, the safety valve online calibration connecting device is connected to the safety valve online calibration component. The pressure sensor and hydraulic cylinder are loaded onto the limiting component in an orderly manner, and the central connecting rod passes through the pressure sensor and hydraulic cylinder. Then, the locking nut is connected to the central connecting rod by thread and adjusted to 0.5-1mm above the force sensor. The hydraulic cylinder applies an upward lifting force to the pressure sensor, and at the same time, the locking nut drives the central connecting rod, so that the safety valve stem drives the spring to apply an upward lifting force until the safety valve is slightly opened. Given the medium force P (MPa) of the safety valve, the lifting force ΔF is measured by the pressure sensor and divided by the sealing surface area of ​​the safety valve, i.e., the flow channel area A (mm 2). Through data analysis, the set pressure of the safety valve Pz = ΔF / A + P is obtained.

[0048] To improve the control of the safety valve opening height during online calibration, a limiting component is installed. By rotating the limiting component, the relative height between the limiting component and the central connecting rod can be adjusted. The limiting component can engage with the limiting surface at the top of the lower flange of the central connecting rod. In this way, the opening height of the safety valve can be effectively controlled by the limiting component, reducing the problem of medium discharge loss after the safety valve is opened.

[0049] Meanwhile, if the safety valve suddenly jumps and fails to reseat during online verification, the distance between the limit component and the central connecting rod can be adjusted to 0 and then tightened further to apply downward pressure to the valve stem, forcing the valve disc to reseat and close, thus realizing the function of forcibly closing and reseating the safety valve.

[0050] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the above specific embodiments. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A safety valve online calibration connection device, characterized in that, include: A central connecting rod, which is detachably connected to the top of the safety valve stem; A sleeve is detachably connected to the top of the safety valve and covers the outside of the top of the safety valve stem. A first threaded hole is provided at the center of the top of the sleeve. A limiting component is provided, wherein the limiting component has a first through hole at its center and a first external thread on its outer circle, the central connecting rod passes through the first through hole and is clearance-fitted with the first through hole, the first external thread is connected to the first threaded hole, and a limiting structure is provided between the limiting component and the central connecting rod to limit the lifting height of the valve stem.

2. The safety valve online calibration connection device according to claim 1, characterized in that, The central connecting rod is threadedly connected to the safety valve stem.

3. The safety valve online calibration connection device according to claim 1, characterized in that, The lower end of the central connecting rod is provided with a first connecting hole and at least two second threaded holes distributed circumferentially. The first connecting hole is sleeved on the top of the safety valve stem, and the second threaded holes are connected to a first radial screw. The central connecting rod and the valve stem are locked together by the first radial screw.

4. The safety valve online calibration connection device according to claim 3, characterized in that, The lower end of the central connecting rod is provided with a flange, and the first connecting hole is opened in the flange.

5. The safety valve online calibration connection device according to claim 4, characterized in that, The top of the flange is provided with a first limiting surface, and the bottom of the limiting member is provided with a second limiting surface that cooperates with the first limiting surface to form a limiting structure.

6. The safety valve online calibration connection device according to claim 1, characterized in that, The sleeve is threadedly connected to the top of the safety valve.

7. The safety valve online calibration connection device according to claim 1, characterized in that, The bottom of the sleeve has at least two third threaded holes spaced apart circumferentially. The bottom of the sleeve is provided with a second connecting hole, which is fitted onto the top of the safety valve. The third threaded holes are connected to a second radial screw, which locks the sleeve and the top of the safety valve together.

8. An online calibration system for safety valves, characterized in that, The device includes the safety valve online calibration connection device and the safety valve online calibration component as described in any one of claims 1 to 7, wherein the safety valve online calibration component is sleeved on the upper part of the central connecting rod and its bottom abuts against the limiting member.

9. The safety valve online calibration system according to claim 8, characterized in that, The online calibration component for the safety valve includes a hydraulic cylinder, a pressure sensor, and a locking element. The hydraulic cylinder abuts against a limiting element, the locking element is fixed to the upper part of the central connecting rod, and the pressure sensor is located between the hydraulic cylinder and the locking element.

10. The safety valve online calibration system according to claim 9, characterized in that, The locking component is a locking nut, which is threadedly connected to the upper part of the central connecting rod.

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