Movable large-diameter valve pressure test operation method

Abstract

The invention belongs to the technical field of valve hydraulic pressure tests, and particularly relates to a movable large-diameter valve pressure test operation method, which comprises the following steps of: sending a tested valve to a pressurizing platform of a pressure test device, starting a pressure test pump, pressurizing water into a valve body, closing the pressure test pump when test pressure is reached, and calculating pressure stabilizing time; if the time requirement is met, the valve pressure test is qualified; the pressure testing device is characterized in that the pressure testing device comprises a frame, a pressing platform, a cross beam, a stand column, an upper pressing plate, a lower pressing plate, universal wheels, a screw lifting adjusting mechanism and an escalator, the universal wheels are installed at the bottom of the frame, and the pressing platform is arranged on the frame; a circulating water tank and a pressure test pump are arranged in a space between the pressing platform and the frame; the escalator is composed of frames on the two sides and a plurality of parallel row rollers. The large-caliber valve pressure test device has the advantages of being suitable for large-caliber valve pressure tests above DN200, convenient to move, capable of reducing the working intensity of workers and capable of saving the machine team cost and the labor cost of a crane.

Description

Technical Field

[0001] The invention belongs to the technical field of valve water pressure testing, and in particular relates to an operating method for pressure testing a movable large-caliber valve. Background Art

[0002] Steel valves are widely used in the electromechanical installation industry. As pressure-bearing components, the tightness and strength of valves play a crucial role in the quality and safety of electromechanical equipment installation. According to national construction acceptance regulations, valves must be individually and proportionally pressure-tested before installation. This is especially true in high-pressure construction projects such as pressure piping and boiler installation, where 100% of the valves used must be pressure-tested before installation. Due to the large number and weight of large-diameter steel valves, which are difficult to carry manually, they are often improvised on-site. However, these improvised pressure test devices are often not recognized, are crude, and difficult to operate, posing significant safety risks and resulting in low pressure testing efficiency. Furthermore, after use, these temporary pressure test devices are no longer useful and must be discarded, resulting in significant waste. Summary of the Invention

[0003] The purpose of the present invention is to provide a movable large-diameter valve pressure test operation method to overcome the shortcomings of the existing technology. It adopts a movable independent water pressure test device, which is suitable for large-diameter valve pressure testing and can be carried out in a fixed place or conveniently at a construction site; it adopts a mechanical lifting and adjusting sealing mechanism, and the operation process is safe and reliable; the test device is easy to move, which reduces the valve relocation and improves the sealing efficiency.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions:

[0005] A movable large-caliber valve pressure test operation method, which includes sending the tested valve to a pressure testing platform of a pressure testing device, ensuring that the two flanges of the valve and the pressure testing device are well sealed to avoid eccentricity; starting the pressure test pump, and pressurizing water into the valve body; during the pressure test, ensuring that there is no leakage at the contact between the valve body and the pressure testing device; observing the value of the pressure gauge; closing the pressure test pump when the test pressure is reached; calculating the pressure stabilization time; and judging that the valve pressure test is qualified when the time requirement is met; the pressure testing device includes a frame, a pressure testing platform, a crossbeam, a column, an upper pressure plate, a lower pressure plate, universal wheels, a screw lifting and adjusting mechanism, and a rolling ladder A universal wheel is installed at the bottom of the frame, and a pressure platform is provided on the frame. The crossbeam is connected to the pressure platform through a column, and the crossbeam is connected to the upper pressure plate through a screw lifting and adjusting mechanism. The lower pressure plate is fixedly connected to the pressure platform, and the middle of the lower pressure plate is opened; a circulating water tank and a pressure test pump are provided in the space between the pressure platform and the frame, and the circulating water tank and the pressure test pump inlet are connected through a water pipe, and the pressure test pump outlet is connected to the lower pressure plate through a pipeline; one side of the frame is hinged to one end of the escalator, and the escalator consists of frame frames on both sides and a plurality of parallel rollers. The other end of the escalator is overlapped with the ground after being released, and is flipped upward and connected to the crossbeam after being folded.

[0006] Furthermore, the screw lifting and adjusting mechanism includes a screw, a handwheel and a nut sleeve, the nut sleeve is fixedly connected to the crossbeam, the screw and the nut sleeve are meshed, the top of the screw is connected to the handwheel, and the bottom of the screw is connected to the upper pressure plate.

[0007] Furthermore, a longitudinal row grille is provided between the lower pressing plate and the rolling ladder, the upper surface of the row grille is flush with the upper edge of the lower pressing plate, and the row grille is fixedly connected to the pressing platform.

[0008] Furthermore, the grid is formed by welding a plurality of round steel bars or round steel pipes on a pressing platform, with a gap of 50-100 mm and a rounded and inclined surface on the outside.

[0009] Furthermore, the valve has a diameter specification of DN200 or above.

[0010] Furthermore, the surfaces of the upper pressing plate and the lower pressing plate are adhered or coated with 3-6 mm rubber sealing pads.

[0011] Furthermore, a traction ring is provided on one side of the frame, and the pressure testing device can be moved by being towed by a motor vehicle.

[0012] Furthermore, the outer diameters of the upper and lower pressure plates are at least 50 mm larger than the outer diameter of the flange of the valve being tested.

[0013] Furthermore, the volume of the circulating water tank matches the specifications of the valve being tested and has a capacity margin of at least 20%.

[0014] Furthermore, the pressure test pump is a 90TJ3 high-pressure plunger pump.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) A mobile independent hydraulic test device is used, which is suitable for pressure testing of large-caliber valves above DN200. The device is easy to move, reducing the transportation of valves. It can be carried out in fixed places or on construction sites. After using this device, the valve pressure test is not restricted by the site, is efficient and flexible, saves construction time, effectively avoids safety and quality risks during the valve pressure test, reduces the workload of workers, and saves crane shift costs and labor costs;

[0017] 2) The mechanical lifting and adjusting sealing mechanism is adopted, which greatly improves the sealing efficiency and sealing effect. The operation process is safe and reliable, and the pressure test process is simple and fast. The device has its own water tank, and the water used in the water pressure test can be recycled, which saves water resources on the one hand and helps to keep the environment clean on the other. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an embodiment of a pressure testing device used in the present invention;

[0019] In the figure: 1-tested valve, 2-frame, 3-pressure testing platform, 4-crossbeam, 5-column, 6-upper pressure plate, 7-lower pressure plate, 8-universal wheel, 9-lifting adjustment mechanism, 10-ladder, 11-circulating water tank, 12-pressure test pump, 13-frame, 14-roller, 15-screw, 16-handwheel, 17-nut sleeve, 18-grid, 19-rubber sealing gasket, 20-traction ring, 21-pressure gauge. DETAILED DESCRIPTION

[0020] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying any creative work.

[0022] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.

[0023] See Figure 1 , which is a structural schematic diagram of a pressure test device for a movable large-caliber valve pressure test operation method of the present invention. The tested valve 1 is sent to the pressure testing platform 3 of the pressure testing device to ensure that the two flanges of the valve and the pressure testing device are well sealed to avoid eccentricity; the pressure test pump 12 is turned on to pressurize water into the valve body. During the pressure test, it is ensured that there is no leakage at the contact point between the valve body and the pressure testing device, and the value of the pressure gauge 21 is observed. When the test pressure is reached, the pressure test pump 12 is turned off, and the pressure stabilization time is calculated. When the time requirement is met, the valve pressure test can be determined to be qualified; it is characterized in that the pressure testing device includes a frame 2, a pressure testing platform 3, a crossbeam 4, a column 5, an upper pressure plate 6, a lower pressure plate 7, a universal wheel 8, a screw 15 lifting and adjusting mechanism 9 and a rolling ladder 10. Universal wheels 8 are mounted at the bottom of the frame 2. A pressure platform 3 is mounted on the frame 2. A crossbeam 4 is connected to the pressure platform 3 via columns 5. The crossbeam 4 is connected to the upper pressure plate 6 via a screw 15 lifting and adjusting mechanism 9. The lower pressure plate 7 is fixedly connected to the pressure platform 3 and has a hole in the middle. A circulating water tank 11 and a pressure test pump 12 are located in the space between the pressure platform 3 and the frame 2. The inlets of the circulating water tank 11 and the pressure test pump 12 are connected by water pipes, and the outlet of the pressure test pump 12 is connected to the lower pressure plate 7 via a pipeline. One side of the frame 2 is hinged to one end of a rolling ladder 10. The ladder 10 consists of two side frames 13 and multiple parallel rollers 14. The other end of the ladder 10 overlaps the ground when released and flips upward to connect to the crossbeam 4 when retracted. The caliber of the valve 1 under test is DN200 or larger. The pressure test pump 12 is a 90TJ3 high-pressure plunger pump. The pressure test process is completed in accordance with the provisions of "GBT13927-2008 Industrial Valve Pressure Test".

[0024] The screw 15 lifting and adjusting mechanism 9 includes a screw 15, a handwheel 16 and a nut sleeve 17. The nut sleeve 17 is fixedly connected to the crossbeam 4. The screw 15 is meshed with the nut sleeve 17. The top of the screw 15 is connected to the handwheel 16, and the bottom of the screw 15 is connected to the upper pressure plate 6.

[0025] To ensure a seal with the valve, the outer diameter of the upper and lower pressure plates 6 and 7 must be at least 50 mm larger than the flange outer diameter of the valve under test 1. To improve sealing performance, a 3-6 mm rubber gasket 19 is adhered or coated on the surfaces of the upper and lower pressure plates 6 and 7. The volume of the circulating water tank 11 matches the specifications of the valve under test 1, with at least a 20% capacity margin.

[0026] A longitudinal grating 18 is installed between the lower platen 7 and the rolling ladder 10. Its upper surface is flush with the upper edge of the lower platen 7 and is fixedly connected to the pressure platform 3. The grating 18 is constructed from multiple round steel bars or pipes welded to the pressure platform 3, with a gap of 50-100mm and a rounded, sloped surface on the outside. Its function is to allow the valve under test 1 to slide smoothly from the grating surface onto the lower platen 7. Frictional resistance is minimal, and the grating gap can be opened with the help of a crowbar.

[0027] In order to facilitate the movement of the pressure test device, a traction ring 20 can be provided on one side of the frame 2 so that the pressure test device can be moved by a motor vehicle (forklift, electric trolley, etc.). The number of universal wheels 8 is set according to the maximum load of the pressure test device and is not limited to four.

[0028] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A movable large-caliber valve pressure test operation method, which is to send the tested valve to the pressure test platform of the pressure test device, ensure that the two flanges of the valve and the pressure test device are well sealed to avoid eccentricity; start the pressure test pump, pressurize water into the valve body, and during the pressure test, ensure that there is no leakage at the contact point between the valve body and the pressure test device, observe the pressure gauge value, and turn off the pressure test pump when the test pressure is reached. Calculate the pressure stabilization time, and the valve pressure test can be determined to be qualified when the time requirement is met; it is characterized by: The pressure testing device includes a frame, a pressure platform, a crossbeam, a column, an upper pressure plate, a lower pressure plate, a universal wheel, a screw lifting and adjusting mechanism and a rolling ladder. A universal wheel is installed at the bottom of the frame, and a pressure platform is provided on the frame. The crossbeam is connected to the pressure platform through the column, and the crossbeam is connected to the upper pressure plate through the screw lifting and adjusting mechanism. The lower pressure plate is fixedly connected to the pressure platform, and the middle of the lower pressure plate has an opening; a circulating water tank and a pressure test pump are provided in the space between the pressure platform and the frame, the circulating water tank and the pressure test pump inlet are connected through a water pipe, and the pressure test pump outlet is connected to the lower pressure plate through a pipeline; one side of the frame is hinged to one end of the rolling ladder, and the rolling ladder consists of frames on both sides and a plurality of parallel rollers. The other end of the rolling ladder overlaps with the ground after being released, and is flipped upward and connected to the crossbeam after being folded.

2. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: The screw lifting and adjusting mechanism includes a screw, a handwheel and a nut sleeve. The nut sleeve is fixedly connected to the crossbeam. The screw is meshed with the nut sleeve. The top of the screw is connected to the handwheel, and the bottom of the screw is connected to the upper pressure plate.

3. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: A longitudinal row grid is provided between the lower pressing plate and the rolling ladder, the upper surface of the row grid is flush with the upper edge of the lower pressing plate, and the row grid is fixedly connected to the pressing platform.

4. A method for pressure testing a movable large-caliber valve according to claim 3, characterized in that: The grid is composed of multiple round steel bars or round steel pipes welded on a pressure platform, with a gap of 50-100mm and a rounded and inclined surface on the outside.

5. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: The valve has a diameter of DN200 or above.

6. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: The surfaces of the upper pressing plate and the lower pressing plate are pasted or coated with 3-6 mm rubber sealing pads.

7. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: A traction ring is provided on one side of the vehicle frame, and the pressure testing device can be moved by being towed by a motor vehicle.

8. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: The outer diameters of the upper and lower pressure plates must be at least 50 mm larger than the outer diameter of the flange of the valve being tested.

9. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: The volume of the circulating water tank matches the specifications of the valve being tested, with a capacity margin of at least 20%.

10. A method for pressure testing a movable large-caliber valve according to claim 1, characterized in that: The pressure test pump is a 90TJ3 high-pressure plunger pump.

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