Off-line verification device for closed safety valve
By designing an off-line calibration device for closed safety valves, using sealing covers and sealing rings to form a sealing environment, clamping the safety valves with clamping hooks, and oil pressure jacks to achieve set pressure tests, solving the problems of slag inclusion, inability to quantify leakage rates, and inaccurate pressure gauge display in the existing safety valves, achieving more accurate setting pressures and automatic quantization of leakage rates.
Patent Information
- Application Number
- CN202421548037.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-07-02
AI Technical Summary
During the offline calibration process of existing safety valves, there are problems such as slag inclusion resulting in damage to the sealing surface, the open safety valve cannot quantify leakage rate, inaccurate pressure gauge display, and a single calibration function.
An off-line calibration device for closed safety valves is designed, including sealing cover, clamping hook, calibration disc, calibration platform, inner sealing ring, hydraulic jack, base plate, outer sealing ring, purge tube, pressure gauge tube and calibration tube. A sealing environment is formed through sealing cover and sealing ring, clamping the safety valve, and hydraulic jack realizes a set pressure test, and high-pressure purge and pressure test are carried out through the calibrating channel.
It realizes the safety and reliability of sealing pressure test and leakage rate test in a closed environment, avoids leakage problems caused by slag inclusion, directly measure the pressure in the valve cavity, more accurate setting pressure, and automatically quantify the leakage rate, breaking through the bottleneck of the difficulty of inspection of old equipment.
Smart Images
Figure CN222671356U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to a safety valve inspection and detection device, in particular to a closed safety valve offline inspection device. Background Art
[0002] The verification process of the existing safety valve offline verification is as follows: put the safety valve on the verification disk, turn on the starting device after fixing it, clamp the safety valve, open the pressurizing valve, and the pressure source gas passes through the pressure pipeline and the verification disk to reach the inner cavity of the safety valve. When the preset pressure is reached, the valve disc opens, which is the set pressure; when it drops to 90% of the set pressure, a sealing pressure test is performed, visually check whether the needle of the pressure gauge falls back, and listen to whether there is any leakage on the sealing surface to judge whether it is qualified.
[0003] The shortcomings of the above verification are:
[0004] 1. When the valve disc is opened, it is easy to contain slag, which can easily cause damage to the sealing surface and cause micro-leakage.
[0005] 2. When checking an open safety valve at room temperature and normal conditions, it is difficult to collect bubbles and the leakage rate cannot be measured. This is the bottleneck of the entire inspection and testing of the safety valve mechanism.
[0006] 3. The pressure gauge pipeline is shared with the calibration pipeline, resulting in inaccurate pressure value displayed by the pressure gauge.
[0007] 4. The calibration disk is equipped with a calibration pipeline with a single function. Summary of the invention
[0008] The utility model provides an off-line calibration device for a closed safety valve, so as to solve the problem that the pressure value of old equipment is inaccurate when tested by manpower, and the open safety valve can only be tested by hearing and visual inspection, and the leakage rate cannot be quantified.
[0009] The technical scheme adopted by the utility model is as follows: it comprises a sealing cover, a clamping hook, a calibration disk, a calibration platform, an inner sealing ring, a hydraulic jack, a base plate, an outer sealing ring, a purge pipe, a pressure gauge pipe and a calibration pipe, wherein the base plate is fixedly connected to the bottom of the outer sealing ring, the upper part of the base plate is fixedly connected to the inner sealing ring, the calibration platform is fixedly connected to the top of the inner sealing ring, the bottom of the hydraulic jack is fixedly connected to the upper part of the base plate by bolts, the piston of the hydraulic jack passes through the calibration platform, the top is fixedly connected to the lower part of the calibration disk, the clamping hook is slidably connected to the clamping hook slideway of the calibration platform, the lower end of the sealing cover is placed above the base plate and between the inner sealing ring and the outer sealing ring, the purge pipe, the pressure gauge pipe and the calibration pipe are connected to the calibration disk at the rear and front ends thereof after passing through the calibration platform and the base plate.
[0010] The calibration plate has a purge channel, a pressure gauge channel and a calibration channel, and is respectively connected to the front ends of the purge pipe, the pressure gauge pipe and the calibration pipe.
[0011] The hydraulic jack is provided with an oil pipe for connecting with an external hydraulic pump.
[0012] The base plate and the calibration platform are fixedly connected by fixing bolts.
[0013] The utility model has the advantages of novel structure. The safety valve is clamped by the clamping device. The sealing device formed by the sealing cover, the inner sealing ring and the outer sealing ring is safe and reliable in a closed environment, meeting the requirements of sealing pressure test and leakage rate test. Three channels are arranged in the middle of the calibration disk, which increases the function of high-pressure purge chamber to prevent slag inclusion when the valve disc is opened, and solves the problem of human leakage caused by slag inclusion on the sealing surface. It also provides an effective path for the pressure gauge to directly test the pressure in the safety valve chamber, while retaining the original calibration function, ending the disadvantage of manual detection, and being able to directly measure the pressure in the valve chamber. The set pressure is more accurate, and the leakage rate of the safety valve is automatically quantified, breaking through the bottleneck of the difficulty of inspection of old equipment, adapting to the requirements of transformation and upgrading of detection equipment, and strengthening the precise calibration function. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of the utility model;
[0015] Figure 2 It is a structural schematic diagram of the utility model without the sealing cover;
[0016] Figure 3 It is a cross-sectional view of the utility model;
[0017] Figure 4 It is a structural schematic diagram of the clamping safety valve of the utility model;
[0018] Figure 5 It is a structural schematic diagram of the calibration disk of the utility model;
[0019] Figure 6 It is a cross-sectional view of the calibration disk of the utility model. DETAILED DESCRIPTION
[0020] like Figure 1 , 2As shown in , 3 and 4, it includes a sealing cover 1, a clamping hook 2, a calibration disk 3, a calibration platform 4, an inner sealing ring 5, a hydraulic jack 6, a base plate 8, an outer sealing ring 9, a purge pipe 10, a pressure gauge pipe 11 and a calibration pipe 12, wherein the base plate 8 is fixedly connected to the bottom of the outer sealing ring 9, the upper part of the base plate 8 is fixedly connected to the inner sealing ring 5, the calibration platform 4 is fixedly connected to the top of the inner sealing ring 5, the bottom of the hydraulic jack 6 is fixedly connected to the upper part of the base plate 8 by bolts, the piston of the hydraulic jack 6 passes through the calibration platform 4, and the top is fixedly connected to the lower part of the calibration disk 3, the clamping hook 2 is slidably connected to the clamping hook slideway 401 of the calibration platform 4, the lower end of the sealing cover 1 is placed above the base plate 8 and between the inner sealing ring 5 and the outer sealing ring 9, the purge pipe 10, the pressure gauge pipe 11 and the calibration pipe 12 pass through the calibration platform 4 and the base plate 8, and the rear and front ends are respectively connected to the calibration disk 3.
[0021] like Figure 5 , 6 As shown, the calibration plate 3 has a purge channel 301, a pressure gauge channel 302, and a calibration channel 303, and is connected to the front end of the purge pipe 10, the pressure gauge pipe 11, and the calibration pipe 12 respectively.
[0022] like Figure 3 As shown, the hydraulic jack 6 has an oil pipe 601 for connecting to an external hydraulic pump.
[0023] like Figure 1 , 3 As shown, the base plate 8 and the calibration platform 4 are fixedly connected by fixing bolts 7 .
[0024] Workpiece principle
[0025] The base plate 8 of the utility model is installed on the external equipment, the oil pipe 601 of the hydraulic jack 6 is connected to the external hydraulic pump, the purge pipe 10, the pressure gauge pipe 11, and the calibration pipe 12 are connected to the steam source or the pressure gauge through the pressure-increasing valve and the pressure-relief valve respectively, the safety valve 13 to be inspected is placed on the calibration plate 3, the hydraulic jack 6 lifts up the calibration plate 3, the safety valve 13 is locked by the clamping hook 2, the pressure-increasing valve and the pressure-relief valve are opened, and the inner cavity of the safety valve is purged with high pressure to remove impurities; the pressure-increasing valve is opened to perform a set pressure test; water is injected between the inner sealing ring 5 and the outer sealing ring 9 and the liquid level is maintained at a certain height, the sealing cover 1 is inserted into the liquid level, a sealing pressure test is performed, bubbles are collected to measure the leakage rate, and the calibration is completed.
Claims
1. A closed safety valve offline calibration device, characterized in that: It includes a sealing cover, a clamping hook, a calibration disk, a calibration platform, an inner sealing ring, a hydraulic jack, a base plate, an outer sealing ring, a purge pipe, a pressure gauge pipe and a calibration pipe, wherein the base plate is fixedly connected to the bottom of the outer sealing ring, the upper part of the base plate is fixedly connected to the inner sealing ring, the calibration platform is fixedly connected to the top of the inner sealing ring, the bottom of the hydraulic jack is fixedly connected to the upper part of the base plate by bolts, the piston of the hydraulic jack passes through the calibration platform, the top is fixedly connected to the lower part of the calibration disk, the clamping hook is slidably connected to the clamping hook slideway of the calibration platform, the lower end of the sealing cover is placed above the base plate and between the inner sealing ring and the outer sealing ring, the purge pipe, the pressure gauge pipe and the calibration pipe are connected to the calibration disk at the rear and front ends after passing through the calibration platform and the base plate.
2. A closed safety valve offline calibration device according to claim 1, characterized in that: The calibration plate has a purge channel, a pressure gauge channel and a calibration channel, and is respectively connected to the front ends of the purge pipe, the pressure gauge pipe and the calibration pipe.
3. The closed safety valve offline calibration device according to claim 1, characterized in that: The hydraulic jack is provided with an oil pipe for connecting with an external hydraulic pump.
4. The closed safety valve offline calibration device according to claim 1, characterized in that: The base plate and the calibration platform are fixedly connected by fixing bolts.