Controllable multifunctional valve pressure test device and use method thereof

Abstract

The present application belongs to the technical field of mechanical assembly, and discloses a controllable multifunctional valve pressure test device and a use method thereof. The device comprises a pressing flat plate, a pressure test main pipe, independent pressure test circuits and a table support. Multiple independent pressure test circuits are connected in parallel to the pressure test main pipe. Each independent pressure test circuit comprises multiple parallel branches. Each branch comprises a pressure test branch pipe, an upper test table plate, a lower test table plate and a fastening mechanism. The device is precise in mechanical assembly, safe in operation, can minimize the total work time of valve pressure test, accurately control the risk of test interruption caused by abnormal branch pipe valves during pressure test, effectively improve the safety factor of personnel and equipment during pressure test, and safely and efficiently complete the pressure test of valves.

Description

Technical Field

[0001] This invention belongs to the field of mechanical assembly technology, specifically relating to a controllable multifunctional valve pressure testing device and its usage method. Background Technology

[0002] A domestic nuclear power plant's Phase I project has installed over 30,000 valves across two WWER-1000 units. Valve connection methods primarily include flange connections, welding, threaded connections, and wafer connections. Nominal valve diameters range from DN8 to DN1200, with most valves below DN400. During operation, valves are required to be free of external leakage, and internal leakage must be controlled within a certain range. For valves installed in critical systems, zero internal leakage is required. However, valve spare parts undergo multiple transportation and storage processes from manufacturer to on-site use, making them highly susceptible to external influences. It cannot be guaranteed that spare parts will not experience internal or external leakage after installation in the system pipelines. To ensure successful installation and commissioning of spare parts, it is essential to conduct sealing and pressure tests on the valves after receipt and before installation in the system pipelines, and these tests must be passed.

[0003] When valve spare parts are installed on the system pipeline after the system is pressurized, the valves have internal leakage defects and need to be disassembled and repaired by re-isolating the valves. After the valves are isolated, the residual medium in the system pipeline needs to be drained, and the system cannot be restored to use in the short term. Some systems cannot be shut down due to operational requirements, resulting in valves being in a state of internal leakage for a long time. When they are disassembled again, the valve sealing surface is severely eroded and cannot be repaired, making the equipment unusable. If pressure testing is to be performed on the valves, special pressure testing tools need to be made according to the valve's structural dimensions and pressure rating.

[0004] Based on past experience with offline valve pressure testing, due to the varying structural lengths of valves produced by different manufacturers, conducting pressure tests before valve installation requires the fabrication of specialized pressure testing tools. Offline pressure testing is then carried out in the maintenance workshop, and only one valve can be pressure tested at a time, making batch testing impossible. This significantly prolongs the valve pressure testing time and reduces work efficiency. Given the large number of valves in Units 1 and 2, conducting pressure tests before valve installation into the system pipeline would require the fabrication of thousands of pressure testing tools. Furthermore, these specialized tools can only test one valve at a time, resulting in lengthy testing times, substantial manpower and material resources, very low work efficiency, and a low success rate for pressure tests.

[0005] For pressure testing of high-pressure valves, due to design flaws in specialized pressure testing tools, each valve requires anywhere from a few to a dozen gaskets. Furthermore, if a gasket is damaged, the entire pressure test must be stopped until a new gasket is installed, requiring a large investment in gasket materials and posing a risk of personnel injury. For valves with larger diameters, specialized pressure testing tools need to be fixed to a pressure testing platform, adding extra manpower and resources. For pressure testing of batches of valves, the timeframe is even longer, making timely completion impossible.

[0006] Therefore, there is an urgent need to develop a testing device that can be used for valve pressure testing, and can complete valve pressure testing efficiently and safely. Summary of the Invention

[0007] The purpose of this invention is to provide a controllable multifunctional valve pressure testing device and its usage method. This pressure testing device has precise mechanical assembly and safe operation. It can minimize the total working time of valve pressure testing and accurately control the risk of test interruption caused by abnormality of branch valves during the pressure test. It effectively improves the safety factor of personnel and equipment during the pressure test and can safely and efficiently complete the valve pressure test.

[0008] Technical solution to achieve the purpose of this invention:

[0009] A controllable multifunctional valve pressure testing device, the valve pressure testing device comprising:

[0010] The pressure plate, pressure test main pipe, independent pressure test circuit and platform support are provided. Multiple independent pressure test circuits are connected in parallel to the pressure test main pipe. Each independent pressure test circuit includes multiple parallel branches. Each branch includes a pressure test branch pipe, an upper test platform, a lower test platform and a fastening mechanism.

[0011] The pressure testing plate is connected to the bottom of the main pressure test pipe, and the main pressure test pipe is connected to the branch pipe, so that the main pressure test pipe is connected to multiple independent pressure test circuits. The upper test platform is connected to the bottom of the branch pipe, and the lower test platform is detachably installed below the upper test platform through a fastening mechanism, so that the gap between the upper and lower test platforms is used to install the valve to be tested. After the valve to be tested is installed, the lower test platform is connected to the upper test platform. A platform bracket is fixedly installed below the upper test platform to fix and support the independent pressure test circuits.

[0012] The valve pressure testing device also includes a valve transfer mechanism. The valve transfer mechanism is connected through the upper test plate and the lower test plate respectively. When the upper test plate and the lower test plate are installed, the end face of the valve transfer mechanism connected to the upper test plate faces downward and the end face of the valve transfer mechanism connected to the lower test plate faces upward.

[0013] The valve transfer mechanism includes a transfer plate and a positioning plate. The positioning plate is connected through to the upper test plate and the lower test plate at the positions corresponding to the pressure test branch pipes, and the transfer plate is connected through to the positioning plate.

[0014] The adapter plate is machined with mounting holes, which are located on a circumference concentric with the adapter plate.

[0015] The adapter plate and the positioning plate are connected by threads.

[0016] A sealing gasket is provided between the adapter plate and the positioning plate for sealing connection between the adapter plate and the positioning plate.

[0017] The valve pressure testing device also includes a main valve, which is located upstream of the independent pressure testing circuit and is used to control the opening and closing of the main pipeline of the pressure testing system.

[0018] The valve pressure testing device includes multiple main valves, with one main valve corresponding to the upstream of each independent pressure test circuit.

[0019] The valve pressure testing device also includes a branch valve, which is provided on the pressure testing branch pipe to control the opening and closing of the pressure testing branch pipe.

[0020] The valve pressure testing device also includes a pressure relief plug. A pressure relief hole is provided at the center of the lower test platform. The pressure relief plug matches the pressure relief hole and is installed on the pressure relief hole by a threaded connection.

[0021] A sealing gasket is provided between the pressure relief plug and the pressure relief hole for sealing connection.

[0022] The fastening mechanism includes adjusting bolts and fastening nuts. Pre-drilled holes are provided at intervals on the outer circumference of the corresponding positioning discs on the upper and lower test plates. The adjusting bolts are matched with the pre-drilled holes, and the upper and lower ends of the adjusting bolts are inserted into the pre-drilled holes of the upper and lower test plates, respectively. The fastening nuts are installed on the upper and lower ends of the adjusting bolts through threaded connections.

[0023] The positioning plate is welded to the upper test platform, and the positioning plate is welded to the lower test platform.

[0024] The main valve is welded to the main pressure test pipe, and the branch valve is welded to the branch pressure test pipe.

[0025] A method for conducting valve sealing tests using a controllable multifunctional valve pressure testing device, the method comprising the following steps:

[0026] Step 1a: Install the valve pressure testing device;

[0027] Step 2a: Install the valve to be tested onto the valve pressure testing device;

[0028] Step 3a: Connect the pressure testing platform and check the test circuit of the valve pressure testing device;

[0029] Step 4a: Perform a valve sealing test on the valve to be tested;

[0030] Step 5a: Depressurize the test circuit of the valve pressure testing device and disassemble the valve to be tested.

[0031] A method for conducting valve strength tests using a controllable multifunctional valve pressure testing device, the method comprising the following steps:

[0032] Step 1b: Install the valve pressure testing device;

[0033] Step 2b: Install the valve to be tested onto the valve pressure testing device;

[0034] Step 3b: Connect the pressure testing platform and check the test circuit of the valve pressure testing device;

[0035] Step 4b: Conduct a valve strength test on the valve to be tested;

[0036] Step 5b: Depressurize the test circuit of the valve pressure testing device and disassemble the valve to be tested.

[0037] Step 1a or step 1b includes:

[0038] Step 1.1: Fabricate sealing gaskets between the adapter plate and the positioning plate, and between the pressure relief plug and the lower test bench plate;

[0039] Step 1.2: Place the sealing gasket into the positioning plate of the upper test bench, connect the adapter plate to the positioning plate, with the end face of the adapter plate having two mounting holes facing downwards;

[0040] Step 1.3: Install a fastening nut on one end of the adjusting bolt and pass it through the pre-drilled hole on the upper test bench.

[0041] Step 1.4: Insert the lower test platform plate with the welding positioning plate into the adjusting bolt from bottom to top, and screw the fastening nut in from below the adjusting bolt to ensure that the lower test platform plate is in a horizontal state;

[0042] Step 1.5: Place the sealing gasket into the positioning plate of the lower test bench, connect the adapter plate and the positioning plate, with the two mounting holes on the end face of the adapter plate facing upwards.

[0043] Step 2a includes:

[0044] Step 2.1a: Insert the valve to be tested between the upper and lower test plates from the side of the test device, and tighten the fastening nuts at both ends of the adjusting bolts so that the valve to be tested is installed between the upper and lower test plates.

[0045] Step 2.2a: Install the other valves to be tested onto the test apparatus according to steps 1.1 to 2.1a respectively;

[0046] Step 2.3a: Adjust the fastening nuts to keep the lower test plate and the upper test plate parallel to each other, and ensure that the lower test plate and the upper test plate are tightly connected.

[0047] Step 2.4a: Place a collection container directly below the lower test bench to collect the water carried out by the airflow during the exhaust process;

[0048] Step 2.5a: Manually close the valve to be tested on the test device so that the valve is fully closed;

[0049] Step 2.6a: Manually open the main pipe valve and branch pipe valve on the test device to ensure that the test circuit is unobstructed.

[0050] Step 2b includes:

[0051] Step 2.1b: Insert the valve to be tested between the upper and lower test plates from the side of the test device, and tighten the fastening nuts at both ends of the adjusting bolts so that the valve to be tested is installed between the upper and lower test plates.

[0052] Step 2.2b: Install the other valves to be tested onto the test apparatus according to steps 1.1 to 2.1b respectively;

[0053] Step 2.3b: Adjust the fastening nuts to ensure that the lower test plate and the upper test plate are parallel and tightly connected.

[0054] Step 2.4b: Place a collection container directly below the lower test bench to collect the water carried out by the airflow during the exhaust process;

[0055] Step 2.5b: Manually open the valve to be tested on the test device to make the valve fully open;

[0056] Step 2.6b: Manually open the main pipe valve and branch pipe valve on the test device to ensure that the test circuit is unobstructed;

[0057] Step 2.7b: Install the sealing gasket at the bottom of the lower test bench plate and screw the pressure relief plug into the pressure relief hole at the bottom of the lower test bench plate.

[0058] Step 3a or 3b includes:

[0059] Step 3.1: Install the pressure plate on the outlet end face of the pressure platform and clamp it with the clamping device;

[0060] Step 3.2: Open the water inlet valve of the pressure testing platform to fill the test circuit with water;

[0061] Step 3.3: Adjust the opening of the air inlet valve on the pressure testing platform to increase the pressure of the test circuit to 0.5MPa. Check for water leakage at the connection of the test circuit. If there is any leakage, tighten it in time.

[0062] Step 4a includes:

[0063] Step 4.1a: Gradually open the valve to be tested on the branch, and vent the gas through the pressure relief hole in the branch where the valve to be tested is located until all the gas in the branch where the valve is located is vented, and then close the valve to be tested.

[0064] Step 4.2a: Continue to adjust the opening of the air inlet valve of the pressure testing platform to increase the pressure of the test circuit until the sealing pressure value is reached. Observe for 15 minutes. If there is no water leakage from the pressure relief hole of the lower test plate during this period, the valve sealing test of this test is qualified.

[0065] Step 4b includes:

[0066] Step 4.1b: Gradually loosen the pressure relief plug at the bottom of the test bench to vent the gas in the corresponding branch until all the gas in the branch is exhausted, then tighten the pressure relief plug.

[0067] Step 4.2b: Continue to adjust the opening of the air inlet valve of the pressure testing platform to increase the pressure of the test circuit until the strength pressure value is reached. Observe for 15 minutes. During this period, observe that there is no water leakage in the valve body to be tested. If there is no leakage, the valve strength test is qualified.

[0068] Step 5a includes:

[0069] Step 5.1a: Adjust the air inlet valve of the pressure testing platform to depressurize the test circuit. After the pressure drops to zero, open the test valve to drain the water accumulated in the circuit.

[0070] Step 5.2a: Loosen the fastening nut at the lower end of the adjusting bolt evenly, remove the test valve from the test device, dry it with compressed air, and place it in the designated storage location.

[0071] Step 5b includes:

[0072] Step 5.1b: Adjust the air inlet valve of the pressure testing platform to depressurize the test circuit. After the pressure drops to zero, remove the pressure relief plug to drain the water accumulated in the circuit.

[0073] Step 5.2b: Loosen the fastening nut at the lower end of the adjusting bolt evenly, remove the test valve from the test device, dry it with compressed air, and place it in the designated storage location.

[0074] The working principle of the controllable multifunctional valve pressure testing device provided by this invention is as follows:

[0075] The controllable multifunctional valve pressure testing device of the present invention includes multiple parallel independent pressure test circuits, each circuit being relatively independent and comprising multiple branches, which are independent of each other. Any one or more branches are controlled by valves on the isolated branches, and similarly, any one or two circuits are controlled by controlling two valves on the main pressure test pipe. Based on the valve's nominal diameter, test pressure, and structural length, a corresponding adapter plate is selected, and the distance between the lower and upper test plates is adjusted. After the valve is installed on the upper and lower test plates, it is fixed by tightening the nuts on the adjusting bolts. Between the upper and lower test benches, a pressure plate is installed and clamped on the pressure platform. Water is injected into the device through the pressure platform to slowly increase the pressure. The pressure relief plugs at the bottom of the lower test bench are opened one by one to release the gas. After the gas in the test device is released, all pressure relief plugs are tightened. The operator pressurizes the test device through the pressure platform. Leak detectors monitor for leaks near the test device. If a leak is found, the relevant fasteners are tightened in time. If the leak cannot be resolved by tightening the bolts, the control valve of that branch is closed, and the pressure test of other valves is continued. The sealing test or strength test is carried out by controlling the opening and closing of the valve to be tested.

[0076] The beneficial technical effects of this invention are as follows:

[0077] 1. The controllable multifunctional valve pressure testing device provided by this invention is designed, measured and manufactured independently based on the structural characteristics of commonly used valves, taking into account the valve material, structural length and sealing pressure. By optimizing the testing device, adding branch pipe valves (isolation valves) on the branch line and installing positioning plates at the sealing gaskets, the utilization rate of sealing gaskets can be effectively improved, the valve pressure test pass rate can be maximized, and the problems of valves being unable to undergo offline pressure testing and the long lead time for batch valve pressure testing can be effectively solved, ensuring the availability of valve spare parts;

[0078] 2. The controllable multi-functional valve pressure testing device provided by the present invention can simultaneously perform pressure tests on multiple types of valves. The valve inlet and outlet can be fixed by adjusting the size of the adapter plate, eliminating the need to manufacture a separate pressure testing device for each type of valve.

[0079] 3. The controllable multifunctional valve pressure testing device provided by the present invention can select adapter plates of different materials according to the valve pressure test level, and prevent valve leakage by measuring the compression rate of the sealing gasket, without the need to manufacture adapter plates of different thicknesses.

[0080] 4. The controllable multifunctional valve pressure testing device provided by the present invention can adjust the vertical height between the upper test plate and the lower test plate according to the valve structure length, without the need to replace fasteners of other sizes;

[0081] 5. By using the controllable multifunctional valve pressure testing device provided by the present invention, one tester can operate the pressure test of multiple valves at the same time, and a single person can witness the sealing performance of multiple valves, saving several times the manpower and time.

[0082] 6. The controllable multifunctional valve pressure testing device provided by the present invention is precisely assembled. By adjusting the gap between the lower test platform plates, the stability of the entire testing device is satisfied, and the stress generated during the pressure test is weakened inside the testing device, without the need to add a fixing device outside the testing device.

[0083] 7. In the controllable multifunctional valve pressure testing device provided by the present invention, a positioning plate of fixed size is installed on the upper test plate and the lower test plate respectively. The positioning plate can prevent the sealing gasket from extending to the free end during the tightening process, which can effectively improve the utilization rate of the sealing gasket, save the time of replacing the sealing gasket, and shorten the total pressure test time.

[0084] 8. The controllable multifunctional valve pressure testing device provided by the present invention has a pressure relief plug installed at the bottom of the lower test plate. The venting speed during the pressure test can be controlled by adjusting the depth of the pressure relief plug inserted into the lower test plate, thereby improving the safety factor of the test process. Furthermore, the pressure of the pressure test circuit can be quickly reduced by removing the pressure relief plug, which effectively improves the safety factor of the test process.

[0085] 9. The controllable multifunctional valve pressure testing device provided by the present invention can simultaneously perform valve sealing tests and shell strength tests;

[0086] 10. The controllable multifunctional valve pressure testing device provided by this invention has potential for widespread application. It is the first of its kind in the domestic and international markets and is applicable to pressure testing of different equipment in different industries, filling a technological gap in this field in China. Attached Figure Description

[0087] Figure 1 A schematic diagram of the structure of a controllable multifunctional valve pressure testing device provided by the present invention;

[0088] Figure 2This is a partially enlarged view of the valve transfer mechanism, which includes a transfer plate and a positioning plate, in a controllable multifunctional valve pressure testing device provided by the present invention.

[0089] Figure 3 This is a partially enlarged view of the pressure relief hole on the lower test platform of a controllable multifunctional valve pressure testing device provided by the present invention.

[0090] In the diagram: 1-Pressure plate; 2-Main pressure test pipe; 3-Main pipe valve; 4-Pressure test branch pipe; 5-Branch valve; 6-Upper test platform; 7-Fastening nut; 8-Adapter plate; 9-Positioning plate; 10-Lower test platform; 11-Pressure relief plug; 12-Adjusting bolt; 13-Platform support; 14-Pressure relief hole; 15-Reserved hole. Detailed Implementation

[0091] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0092] like Figure 1 As shown, the present invention provides a controllable multifunctional valve pressure testing device, comprising: a pressure testing plate 1, a pressure testing main pipe 2, a main pipe valve 3, a pressure testing branch pipe 4, a branch pipe valve 5, an upper test platform 6, a fastening nut 7, an adapter plate 8, a positioning plate 9, a lower test platform 10, a pressure relief plug 11, an adjusting bolt 12, a platform support 13; 14-pressure relief hole; 15-reserved hole.

[0093] The pressure testing plate 1 is located below the pressure test main pipe 2. The pressure testing plate 1 and the pressure test main pipe 2 are connected by welding. The pressure test main pipe 2 mainly includes straight pipes, equal diameter tees, and 90° elbows. The pipes and fittings are connected by welding. Two parallel independent test circuits are connected to the pressure test main pipe 2. Each independent test circuit includes 5 branches, namely 5 pressure test branch pipes 4. The pressure test main pipe 2 is connected to 10 pressure test branch pipes 4 respectively. The 10 pressure test branch pipes 4 are connected to the pressure test main pipe 2 by welding, so that the pressure test main pipe 2 is connected to the two independent pressure test circuits respectively.

[0094] The main pressure test pipe 2 is equipped with a main pipe valve 3, which is located upstream of the pressure test branch pipe 4. The main pipe valve 3 controls the opening and closing of the main pressure test pipe 2. The main pressure test pipe 2 is connected to the two main pipe valves 3 by welding. Figure 1 As shown, in this embodiment, a main valve 3 is provided upstream of each independent pressure test circuit.

[0095] The pressure test branch pipe 4 is equipped with branch pipe valves 5, which are used to control the opening and closing of the pipeline of the pressure test branch pipe 4. The pressure test branch pipe 4 and the 10 branch pipe valves 5 are connected by welding.

[0096] Two parallel upper test plates 6 are located below the pressure test branch pipes 4 in two independent test circuits, that is, the five pressure test branch pipes 4 in each independent test circuit are connected to one upper test plate 6, and each upper test plate 6 and the five pressure test branch pipes 4 are connected by welding.

[0097] Ten lower test plates 10, each corresponding to a pressure test branch pipe 4, are located below two upper test plates 6. The upper test plates 6 and lower test plates 10 are welded to the corresponding pressure test branch pipes 4, and the positioning plates 9 are threadedly connected to the adapter plates 8. A sealing gasket is installed at the connection between the positioning plates 9 and the adapter plates 8 for a sealed connection. Two mounting holes are machined on the adapter plates 8, located on a circle concentric with the adapter plates, with the distance between the two holes being half the distance between the holes. The two holes and their centers are collinear. By machining the mounting holes, a special hook wrench can be inserted into the two mounting holes to easily tighten or loosen the adapter plates, facilitating installation.

[0098] On the upper test plate 6 and the lower test plate 10, there are reserved holes 15 at intervals on the outer circumference of the corresponding connecting positioning plate 9, and the adjusting bolts 12 are matched with the reserved holes 15.

[0099] When the upper test plate 6 and the lower test plate 10 are installed, the end face of the valve transfer mechanism connected to the positioning plate 9 and the transfer plate 8 on the upper test plate 6 faces downward, and the end face of the valve transfer mechanism connected to the positioning plate 9 and the transfer plate 8 on the lower test plate 10 faces upward.

[0100] The upper and lower ends of the adjusting bolt 12 are inserted into the reserved holes 15 of the upper test plate 6 and the lower test plate 10, respectively, and the fastening nut 7 is installed on the upper and lower ends of the adjusting bolt 12 through threaded connection.

[0101] The lower test plate 10 is detachably installed below the upper test plate 6 by means of the fastening mechanism of the adjusting bolt 12 and the fastening nut 7, so that there is a gap between the upper test plate 6 and the lower test plate 10 for installing the valve to be tested. After the valve to be tested is installed, the lower test plate 10 and the upper test plate 6 are connected.

[0102] A pressure relief hole 14 (also called a center hole) is provided at the center of the lower test bench plate 10, and the pressure relief hole 14 is connected to the upper test bench plate 6. The pressure relief plug 11 is matched with the pressure relief hole 14 and is installed on the pressure relief hole 14 by threaded connection; a sealing gasket is installed at the connection between the pressure relief plug 11 and the lower test bench plate 10 for sealing connection between the pressure relief plug 11 and the pressure relief hole 14.

[0103] Two platform supports 13 are located below the upper test platform 6. The two platform supports 13 and the two upper test platforms 6 are connected by welding 3 to fix and support the independent pressure test circuit.

[0104] The valve sealing test is performed using a controllable multifunctional valve pressure testing device provided by this invention, specifically including the following steps:

[0105] Step 1a: Install the valve pressure testing device

[0106] Step 1.1a: Select the material of the sealing gasket according to the pressure level of the valve to be tested, and use a gasket cutter to make the sealing gasket between the adapter plate 8 and the positioning plate 9, the pressure relief plug 11 and the lower test plate 10, and clean the debris from the edge of the sealing gasket.

[0107] Step 1.2a: Place the sealing gasket into the positioning plate 9 of the upper test bench plate 6, and use the adapter plate 8 to screw into the positioning plate 9 to fix the sealing gasket. The end face of the adapter plate 8 with two mounting holes should face down. Use a hook wrench to insert into the two holes and tighten the adapter plate 8.

[0108] Step 1.3a: Install the fastening nut 7 on one end of the adjusting bolt 12, pass it through the reserved hole 15 on the upper test plate 6, and adjust the depth to which the fastening nut 7 is screwed into the adjusting bolt 12 to ensure that the fastening nut 7 leaves a certain amount of tightening in the future.

[0109] Step 1.4a: Insert the lower test plate 10 with the positioning plate 9 welded on into the adjusting bolt 12 from bottom to top, and screw the fastening nut 7 into the adjusting bolt 12 from below. Adjust the depth of screwing in the fastening nut 7 to ensure that the lower test plate 10 is in a horizontal state.

[0110] Step 1.5a: Place the sealing gasket into the positioning plate 9 of the lower test bench plate 10, and use the adapter plate 8 to screw into the positioning plate 9 to fix the sealing gasket. The end face of the adapter plate 8 with two mounting holes should face upwards. Use a hook wrench to tighten the adapter plate 8.

[0111] Step 2a: Install the valve to be tested onto the valve pressure testing device.

[0112] Step 2.1a: Clean the inlet and outlet faces of the valve to be tested. Insert the valve into the test apparatus from the side between the upper test plate 6 and the lower test plate 10. Tighten the fastening nuts 7 at both ends of the adjusting bolt 12 to ensure that the valve to be tested is installed between the upper test plate 6 and the lower test plate 10. The compression rate of the sealing gaskets at the inlet and outlet of the valve to be tested should be 30% (at this compression rate, the sealing gaskets can ensure that the connection between the valve to be tested and the valve pressure test apparatus of this patent meets the test requirements and there is no leakage). The upper test plate 6 and the lower test plate 10 are parallel to each other to meet the requirements for stable installation. In this patent, the function of the adapter plate 8 is to fix the sealing gaskets at the valve inlet and outlet. The adapter plate 8 and the positioning plate 9 are connected by threads and do not participate in the sealing function.

[0113] Step 2.2a: Install the other 9 valves to be tested onto the test apparatus according to steps 1.1a to 2.1a respectively;

[0114] Step 2.3a: Adjust the fastening nut 7, use a vernier caliper to measure the distance of bolt 12 between the lower test plate 10 and the upper test plate 6, ensure that the four distances are equal, keep the lower test plate 10 and the upper test plate 6 parallel, and ensure that the lower test plate 10 is tightly connected.

[0115] Step 2.4a: Place a plastic basin directly below the lower test plate 10. After opening the valve to be tested, ensure that the water carried out by the airflow during the exhaust process can flow out through the pressure relief hole 14 on the lower test plate 10 and drip into the basin.

[0116] Step 2.5a: Manually close the 10 valves to be tested on the test device so that the valves are fully closed. If there are no defects on the valve sealing surface, no water droplets will flow out of the pressure relief hole 14 on the lower test plate 10.

[0117] It should be noted that during the valve sealing test, it is not necessary to screw the pressure relief plug 11 into the bottom pressure relief hole 14 of the lower test plate 10. Simply closing the test valve is sufficient to prevent air leakage from the bottom pressure relief hole 14 of the lower test plate 10.

[0118] Step 2.6a: Manually open the two main pipe valves 3 and the ten branch pipe valves 5 on the test device to ensure that the test circuit is unobstructed;

[0119] Step 3a: Connect the pressure testing platform and check the test circuit of the valve pressure testing device.

[0120] Step 3.1a: Install the pressure plate 1 on the outlet end face of the pressure platform and clamp it with a clamping device. The clamping force should be three times the test pressure to meet the test requirements.

[0121] Step 3.2a: Open the water inlet valve of the pressure testing platform and fill the test circuit with water;

[0122] Step 3.3a: Adjust the opening of the air inlet valve on the pressurization platform to increase the pressure of the test circuit to 0.5MPa. Check for water leakage at the connection of the test circuit. If there is any leakage, tighten it in time.

[0123] Step 4a: Perform a valve sealing test on the valve to be tested.

[0124] Step 4.1a: Gradually open the valves to be tested on the branch, and vent the gas through the pressure relief hole 14 on the lower test plate 10 of the valve pressure testing device of this patent until the gas in the branch where the valve to be tested is located is exhausted, and then close the valve to be tested.

[0125] Step 4.2a: Continue to adjust the opening of the air inlet valve of the pressure testing platform to increase the pressure of the test circuit until the sealing pressure value is reached. Observe for 15 minutes. If there is no water leakage in the pressure relief hole 14 of the lower test plate 10 during this period, the valve sealing test of this test is qualified.

[0126] Step 5a: Depressurize the test circuit of the valve pressure testing device and disassemble the valve to be tested.

[0127] Step 5.1a: Adjust the air inlet valve of the pressure testing platform to depressurize the test circuit. After the pressure drops to zero, open the test valve and drain the water accumulated in the circuit through the pressure relief hole 14 on the lower test plate 10 of the valve pressure testing device of this patent.

[0128] Step 5.2a: Loosen the fastening nuts 7 at the lower ends of the four adjusting bolts 12 evenly, remove the test valve from the test device, dry it with compressed air, and place it in the designated storage location.

[0129] The controllable multifunctional valve pressure testing device provided by this invention is used to conduct valve strength tests, specifically including the following steps:

[0130] Step 1b: Install the valve pressure testing device

[0131] Step 1.1b: Select the material of the sealing gasket according to the pressure level of the valve to be tested, and use a gasket cutter to make the sealing gasket between the adapter plate 8 and the positioning plate 9, the pressure relief plug 11 and the lower test plate 10, and clean the debris from the edge of the sealing gasket.

[0132] Step 1.2b: Place the sealing gasket into the positioning plate 9 of the upper test bench plate 6, and use the adapter plate 8 to screw into the positioning plate 9 to fix the sealing gasket. The end face of the adapter plate 8 with two mounting holes should face down. Use a hook wrench to insert into the two holes and tighten the adapter plate 8.

[0133] Step 1.3b: Install the fastening nut 7 on one end of the adjusting bolt 12, pass it through the reserved hole 15 on the upper test plate 6, and adjust the depth to which the fastening nut 7 is screwed into the adjusting bolt 12 to ensure that the fastening nut 7 leaves a certain amount of tightening in the future.

[0134] Step 1.4b: Insert the lower test plate 10 with the positioning plate 9 welded on into the adjusting bolt 12 from bottom to top, and screw the fastening nut 7 into the adjusting bolt 12 from below. Adjust the depth of screwing in the fastening nut 7 to ensure that the lower test plate 10 is in a horizontal state.

[0135] Step 1.5b: Place the sealing gasket into the positioning plate 9 of the lower test bench plate 10, and use the adapter plate 8 to screw into the positioning plate 9 to fix the sealing gasket. The end face of the adapter plate 8 with two mounting holes should face upwards. Use a hook wrench to tighten the adapter plate 8.

[0136] Step 2b: Install the valve to be tested onto the valve pressure testing device.

[0137] Step 2.1b: Clean the inlet and outlet end faces of the valve to be tested, install the valve from the side of the test device between the upper test plate 6 and the lower test plate 10, tighten the fastening nuts 7 at both ends of the adjusting bolt 12, so that the upper test plate 6 and the lower test plate 10 are parallel to each other, and the compression rate of the valve inlet and outlet sealing gaskets is 30%.

[0138] Step 2.2b: Install the other 9 valves to be tested onto the test apparatus according to steps 1.1b to 2.1b respectively;

[0139] Step 2.3b: Adjust the fastening nut 7, use a vernier caliper to measure the distance of bolt 12 between the lower test plate 10 and the upper test plate 6, ensure that the four distances are equal, keep the lower test plate 10 and the upper test plate 6 parallel, and ensure that the lower test plate 10 is tightly connected.

[0140] Step 2.4b: Place a plastic basin directly under the lower test platform. When the valve to be tested is opened, ensure that the water carried out by the airflow during the exhaust process can drip into the basin.

[0141] Step 2.5b: Manually open the 10 valves to be tested on the test device to make the valves fully open;

[0142] Step 2.6b: Manually open the two main pipe valves 3 and the ten branch pipe valves 5 on the test device to ensure that the test circuit is unobstructed;

[0143] Step 2.7b: Install 10 sealing gaskets at the bottom of the lower test plate 10, and screw the pressure relief plug 11 into the pressure relief hole 14 at the bottom of the lower test plate 10;

[0144] Step 3b: Connect the pressure testing platform and check the test circuit of the valve pressure testing device.

[0145] Step 3.1b: Install the pressure plate 1 on the outlet end face of the pressure platform, clamp it with the clamping device, and adjust the clamping force to 3 times the test pressure;

[0146] Step 3.2b: Open the water inlet valve of the pressure testing platform and fill the test circuit with water;

[0147] Step 3.3b: Adjust the opening of the air inlet valve on the pressurization platform to increase the pressure of the test circuit to 0.5MPa. Check for water leakage at the connection of the test circuit. If there is any leakage, tighten it in time.

[0148] Step 4b: Conduct a valve strength test on the valve to be tested.

[0149] Step 4.1b: Gradually loosen the pressure relief plug 11 at the bottom of the test bench plate 10 to vent the gas in the corresponding branch until the gas in the corresponding branch is exhausted, then tighten the pressure relief plug 11.

[0150] Step 4.2b: Continue to adjust the opening of the air inlet valve of the pressure testing platform to increase the pressure of the test circuit until the strength pressure value is reached. Observe for 15 minutes. During this period, observe that there is no water leakage in the valve body to be tested. If there is no leakage, the valve strength test is qualified.

[0151] Step 5b: Depressurize the test circuit of the valve pressure testing device and disassemble the valve to be tested.

[0152] Step 5.1b: Adjust the air inlet valve of the pressure testing platform to depressurize the test circuit. After the pressure drops to zero, remove the pressure relief plug 11 to drain the water accumulated in the circuit.

[0153] Step 5.2b: Loosen the fastening nuts 7 at the lower ends of the four adjusting bolts 12 evenly, remove the test valve from the test device, dry it with compressed air, and place it in the designated storage location.

[0154] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A controllable multifunctional valve pressure testing device, characterized in that, The valve pressure testing device includes: The pressure plate (1), the pressure test main pipe (2), the independent pressure test circuit and the platform support (13) are connected in parallel to the pressure test main pipe (2). Each independent pressure test circuit includes multiple parallel branches. Each branch includes a pressure test branch pipe (4), an upper test platform (6), a lower test platform (10), and a fastening mechanism. The pressure plate (1) is connected to the bottom of the pressure test main pipe (2), and the pressure test branch pipe (4) is connected to the top of the pressure test main pipe (2), so that the pressure test main pipe (2) is connected to multiple independent pressure test circuits respectively; the upper test plate (6) is connected to the bottom of the pressure test branch pipe (4), and the lower test plate (10) is detachably installed below the upper test plate (6) through a fastening mechanism, so that the gap between the upper test plate (6) and the lower test plate (10) is used to install the valve to be tested. After the valve to be tested is installed, the lower test plate (10) is connected to the upper test plate (6); a plate bracket (13) is fixedly installed below the upper test plate (6) for fixing and supporting the independent pressure test circuits; The valve pressure testing device also includes a valve transfer mechanism. The upper test plate (6) and the lower test plate (10) are respectively connected to the valve transfer mechanism. When the upper test plate (6) and the lower test plate (10) are installed, the end face of the valve transfer mechanism connected to the upper test plate (6) faces downward and the end face of the valve transfer mechanism connected to the lower test plate (10) faces upward. The valve transfer mechanism includes a transfer plate (8) and a positioning plate (9). The positioning plate (9) is connected to the position of the pressure test branch pipe (4) on the upper test plate (6) and the lower test plate (10), respectively. The transfer plate (8) is connected to the positioning plate (9).

2. The controllable multifunctional valve pressure testing device according to claim 1, characterized in that, The adapter plate (8) is machined with mounting holes, which are located on a circumference concentric with the adapter plate.

3. The controllable multifunctional valve pressure testing device according to claim 2, characterized in that, The adapter plate (8) and the positioning plate (9) are connected by threads.

4. The controllable multifunctional valve pressure testing device according to claim 3, characterized in that, A sealing gasket is provided between the adapter plate (8) and the positioning plate (9) for sealing connection between the adapter plate (8) and the positioning plate (9).

5. The controllable multifunctional valve pressure testing device according to claim 4, characterized in that, The valve pressure test device also includes a main valve (3). The main valve (3) is provided on the pressure test main pipe (2). The main valve (3) is located upstream of the independent pressure test circuit and is used to control the opening and closing of the pipeline of the pressure test main pipe (2).

6. The controllable multifunctional valve pressure testing device according to claim 5, characterized in that, The valve pressure testing device includes multiple main valves (3), with a main valve (3) corresponding to the upstream of each independent pressure test circuit.

7. The controllable multifunctional valve pressure testing device according to claim 6, characterized in that, The valve pressure test device also includes a branch valve (5). The pressure test branch pipe (4) is equipped with a branch valve (5) for controlling the opening and closing of the pipeline of the pressure test branch pipe (4).

8. The controllable multifunctional valve pressure testing device according to claim 7, characterized in that, The valve pressure testing device also includes a pressure relief plug (11), and a pressure relief hole is provided at the center of the lower test plate (10). The pressure relief plug (11) matches the pressure relief hole, and the pressure relief plug (11) is installed on the pressure relief hole by a threaded connection.

9. A controllable multifunctional valve pressure testing device according to claim 8, characterized in that, A sealing gasket is provided between the pressure relief plug (11) and the pressure relief hole for sealing connection between the pressure relief plug (11) and the pressure relief hole.

10. A controllable multifunctional valve pressure testing device according to claim 9, characterized in that, The fastening mechanism includes an adjusting bolt (12) and a fastening nut (7). There are reserved holes at intervals on the outer circumference of the positioning plate (9) on the upper test plate (6) and the lower test plate (10). The adjusting bolt (12) matches the reserved holes. The upper and lower ends of the adjusting bolt (12) are inserted into the reserved holes of the upper test plate (6) and the lower test plate (10) respectively. The fastening nut (7) is installed on the upper and lower ends of the adjusting bolt (12) by thread connection.

11. A controllable multifunctional valve pressure testing device according to claim 10, characterized in that, The positioning plate (9) is welded to the upper test platform (6), and the positioning plate (9) is welded to the lower test platform (10).

12. The controllable multifunctional valve pressure testing device according to claim 11, characterized in that, The main valve (3) is welded to the main pressure test pipe (2), and the branch valve (5) is welded to the branch pressure test pipe (4).

13. A method for valve sealing testing, employing a controllable multifunctional valve pressure testing device according to claim 12, characterized in that, The method includes the following steps: Step 1a: Install the valve pressure testing device; Step 2a: Install the valve to be tested onto the valve pressure testing device; Step 3a: Connect the pressure testing platform and check the test circuit of the valve pressure testing device; Step 4a: Perform a valve sealing test on the valve to be tested; Step 5a: Depressurize the test circuit of the valve pressure testing device and disassemble the valve to be tested.

14. The method for valve sealing test according to claim 13, characterized in that, Step 1a includes: Step 1.1: Make sealing gaskets between the adapter plate (8) and the positioning plate (9), and between the pressure relief plug (11) and the lower test bench plate (10); Step 1.2: Place the sealing gasket into the positioning plate (9) of the upper test bench (6), connect the adapter plate (8) and the positioning plate (9), with the two mounting holes on the end face of the adapter plate (8) facing downwards; Step 1.3: Install the fastening nut (7) on one end of the adjusting bolt (12) and pass it through the reserved hole on the upper test plate (6); Step 1.4: Insert the lower test plate (10) with the positioning plate (9) welded on from bottom to top into the adjusting bolt (12), and screw the fastening nut (7) into the adjusting bolt (12) from below to ensure that the lower test plate (10) is in a horizontal state. Step 1.5: Place the sealing gasket into the positioning plate (9) of the lower test bench (10), connect the adapter plate (8) and the positioning plate (9), with the two mounting holes on the end face of the adapter plate (8) facing upwards.

15. A method for valve sealing test according to claim 13, characterized in that, Step 2a includes: Step 2.1a: Insert the valve to be tested from the side of the test device between the upper test plate (6) and the lower test plate (10), and tighten the fastening nuts (7) at both ends of the adjusting bolt (12) so that the valve to be tested is installed between the upper test plate (6) and the lower test plate (10); Step 2.2a: Install the other valves to be tested onto the test apparatus according to steps 1.1 to 2.1a respectively; Step 2.3a: Adjust the fastening nut (7) to keep the lower test plate (10) and the upper test plate (6) parallel, and ensure that the lower test plate (10) is tightly connected. Step 2.4a: Place a collection container directly below the lower test bench (10) to collect the water carried out by the airflow during the exhaust process; Step 2.5a: Manually close the valve to be tested on the test device so that the valve is fully closed; Step 2.6a: Manually open the main pipe valve (3) and branch pipe valve (5) on the test device to ensure that the test circuit is unobstructed.

16. A method for valve sealing test according to claim 13, characterized in that, Step 3a includes: Step 3.1: Install the pressure plate (1) on the outlet end face of the pressure platform and clamp it with a clamping device; Step 3.2: Open the water inlet valve of the pressure testing platform to fill the test circuit with water; Step 3.3: Adjust the opening of the air inlet valve on the pressure testing platform to increase the pressure of the test circuit to 0.5MPa. Check for water leakage at the connection of the test circuit. If there is any leakage, tighten it in time.

17. A method for valve sealing test according to claim 13, characterized in that, Step 4a includes: Step 4.1a: Gradually open the valve to be tested on the branch, and vent the gas through the pressure relief hole in the branch where the valve to be tested is located until all the gas in the branch where the valve is located is vented, and then close the valve to be tested. Step 4.2a: Continue to adjust the opening of the air inlet valve of the pressurization platform to increase the pressure of the test circuit until the sealing pressure value is reached. Observe for 15 minutes. If there is no water leakage in the pressure relief hole of the lower test plate (10) during this period, the valve sealing test of this test is qualified.

18. A method for valve sealing test according to claim 13, characterized in that, Step 5a includes: Step 5.1a: Adjust the air inlet valve of the pressure testing platform to depressurize the test circuit. After the pressure drops to zero, open the test valve to drain the water accumulated in the circuit. Step 5.2a: Loosen the fastening nut (7) at the lower end of the adjusting bolt (12) evenly, remove the test valve from the test device, dry it with compressed air, and place it in the designated storage location.

19. A method for testing the strength of a valve, employing a controllable multifunctional valve pressure testing device according to claim 12, characterized in that, The method includes the following steps: Step 1b: Install the valve pressure testing device; Step 2b: Install the valve to be tested onto the valve pressure testing device; Step 3b: Connect the pressure testing platform and check the test circuit of the valve pressure testing device; Step 4b: Conduct a valve strength test on the valve to be tested; Step 5b: Depressurize the test circuit of the valve pressure testing device and disassemble the valve to be tested.

20. A method for testing the strength of a valve according to claim 19, characterized in that, Step 1b includes: Step 1.1: Make sealing gaskets between the adapter plate (8) and the positioning plate (9), and between the pressure relief plug (11) and the lower test bench plate (10); Step 1.2: Place the sealing gasket into the positioning plate (9) of the upper test bench (6), connect the adapter plate (8) and the positioning plate (9), with the two mounting holes on the end face of the adapter plate (8) facing downwards; Step 1.3: Install the fastening nut (7) on one end of the adjusting bolt (12) and pass it through the reserved hole on the upper test plate (6); Step 1.4: Insert the lower test plate (10) with the positioning plate (9) welded on from bottom to top into the adjusting bolt (12), and screw the fastening nut (7) into the adjusting bolt (12) from below to ensure that the lower test plate (10) is in a horizontal state. Step 1.5: Place the sealing gasket into the positioning plate (9) of the lower test bench (10), connect the adapter plate (8) and the positioning plate (9), with the two mounting holes on the end face of the adapter plate (8) facing upwards.

21. A method for testing the strength of a valve according to claim 19, characterized in that, Step 2b includes: Step 2.1b: Insert the valve to be tested from the side of the test device between the upper test plate (6) and the lower test plate (10), and tighten the fastening nuts (7) at both ends of the adjusting bolt (12) so that the valve to be tested is installed between the upper test plate (6) and the lower test plate (10); Step 2.2b: Install the other valves to be tested onto the test apparatus according to steps 1.1 to 2.1b respectively; Step 2.3b: Adjust the fastening nut (7) to keep the lower test plate (10) and the upper test plate (6) parallel, and ensure that the lower test plate (10) is tightly connected. Step 2.4b: Place a collection container directly below the lower test bench (10) to collect the water carried out by the airflow during the exhaust process; Step 2.5b: Manually open the valve to be tested on the test device to make the valve fully open; Step 2.6b: Manually open the main pipe valve (3) and branch pipe valve (5) on the test device to ensure that the test circuit is unobstructed; Step 2.7b: Install the sealing gasket at the bottom of the lower test plate (10) and screw the pressure relief plug (11) into the pressure relief hole at the bottom of the lower test plate (10).

22. The method for testing the strength of a valve according to claim 19, characterized in that, Step 3b includes: Step 3.1: Install the pressure plate (1) on the outlet end face of the pressure platform and clamp it with a clamping device; Step 3.2: Open the water inlet valve of the pressure testing platform to fill the test circuit with water; Step 3.3: Adjust the opening of the air inlet valve on the pressure testing platform to increase the pressure of the test circuit to 0.5MPa. Check for water leakage at the connection of the test circuit. If there is any leakage, tighten it in time.

23. The method for testing the strength of a valve according to claim 19, characterized in that, Step 4b includes: Step 4.1b: Gradually loosen the pressure relief plug (11) at the bottom of the test bench (10) to vent the gas in the branch until the gas in the branch is exhausted, then tighten the pressure relief plug (11). Step 4.2b: Continue to adjust the opening of the air inlet valve of the pressure testing platform to increase the pressure of the test circuit until the strength pressure value is reached. Observe for 15 minutes. During this period, observe that there is no water leakage in the valve body to be tested. If there is no leakage, the valve strength test is qualified.

24. A method for testing the strength of a valve according to claim 19, characterized in that, Step 5b includes: Step 5.1b: Adjust the air inlet valve of the pressure testing platform to depressurize the test circuit. After the pressure drops to zero, remove the pressure relief plug (11) to drain the water accumulated in the circuit. Step 5.2b: Loosen the fastening nut (7) at the lower end of the adjusting bolt (12) evenly, remove the test valve from the test device, dry it with compressed air, and place it in the designated storage location.

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