A single-channel multi-directional pressurization leak detection control system for valve low-temperature pressure testing

Abstract

The present invention belongs to the field of valve pressure test control, and specifically relates to a single-channel multi-directional pressurization and leak detection control system for low-temperature pressure testing of valves. A single-channel multi-directional pressurization and leak detection control system for low-temperature pressure testing of valves, which includes a system pressure source, a pressure regulating valve, and a four-way pressure distributor that are connected in sequence and then divided into three channels and pressurized and leak detected after passing through the three-way pressure distributor, and respectively connected to the upstream end, middle cavity, and downstream end of the valve to be tested to form a multi-directional pressure test switching circuit system. The effects of the present invention are: (1) forming multiple test switching circuits at the same time, improving test efficiency and reducing production costs. (2) using a self-contained filtering system to reduce the impact of the test medium on the sealing performance of the valve. (3) during the test, there is no need to disassemble the switching test pipeline, thereby improving the test safety. (4) the system provides double cut-off protection, thereby improving the safety of the test process.

Description

Technical Field

[0001] The present invention belongs to the field of valve pressure test control, and in particular relates to a single-channel multi-directional pressurization leak detection control system for a valve low-temperature pressure test. Background Art

[0002] Due to the harsh working conditions of ultra-low temperature valves, in order to verify the product performance, liquid nitrogen is usually used as the cooling medium to conduct multi-directional pressure sealing tests on the valve seats on both sides at a low temperature of -196℃ in accordance with relevant standards before leaving the factory.

[0003] The existing low-temperature pressurization system is one-way. At the same time, due to the volatility of liquid nitrogen and its easy occurrence of frostbite on humans, multi-directional pressurization and leak detection switching cannot be achieved under ultra-low temperature conditions. As a result, the test tooling needs to be disassembled and switched multiple times during the test, resulting in low efficiency, certain safety risks, and high testing costs. Summary of the Invention

[0004] In response to the above-mentioned problems, the present invention provides a single-channel multi-directional pressurization and leak detection control method for low-temperature pressure testing of valves, which fundamentally realizes that after the test system is connected once, through system switching, the test efficiency is improved and the safety risk factors and test costs during the test are minimized.

[0005] The technical solution of the present invention is: a single-channel multi-directional pressurization and leak detection control system for low-temperature pressure testing of valves, which includes a system pressure source, a pressure regulating valve, and a four-way pressure distributor connected in sequence, which are then divided into three channels and pressurized and leak detected after passing through the three-way pressure distributor, and are respectively connected to the upstream end, middle cavity, and downstream end of the valve to be tested to form a multi-directional pressure test switching loop system.

[0006] As described above, a single-channel multi-directional pressurization leak detection control system for a valve low-temperature pressure test adopts a system pressure source to provide pressure for the test circuit.

[0007] As described above, a single-channel multi-directional pressurization leak detection control system for low-temperature pressure testing of valves is used, wherein the system pressure is controlled by a pressure control valve and monitored by a pressure gauge on a four-way pressure distributor, thereby forming three pressure sub-channels.

[0008] As described above, a single-channel multi-directional pressurization leak detection control system for a valve low-temperature pressure test adopts three-channel pressure sub-branching and respectively adopts two-way supporting filters to filter the test medium, and at the same time plays a supporting role for the test pipeline.

[0009] As described above, a single-path multi-directional pressurization and leak detection control system for a valve low-temperature pressure test, wherein the three sub-paths are formed into pressurization and leak detection ends after passing through a three-way pressure distributor.

[0010] As described above, a single-channel multi-directional pressurization leak detection control system for a valve low-temperature pressure test, wherein the three-channel pressure sub-branch pressurization end pipelines are respectively connected to the upstream end, the middle cavity, and the downstream end of the valve to be tested, thereby forming a multi-directional pressure test switching circuit system.

[0011] As described above, a single-channel multi-directional pressurization leak detection control system for a valve low-temperature pressure test is provided, wherein three sub-branches are respectively provided with normally open shut-off valves to prevent abnormal pressure increase at the upstream end and provide double shut-off protection.

[0012] In the above-mentioned single-channel multi-directional pressurization leak detection control system for low-temperature pressure testing of valves, the two-way supporting filter is a capillary filter hole.

[0013] The effects of the present invention are as follows: (1) multiple test switching circuits are formed simultaneously, thereby improving test efficiency and reducing production costs. (2) a built-in filtration system is used to reduce the impact of the test medium on the valve sealing performance. (3) during the test, there is no need to disassemble the switching test pipeline, thereby improving test safety. (4) the system provides double cut-off protection, thereby improving the safety of the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the single-channel multi-directional pressurization leak detection control system for valve low-temperature pressure testing

[0015] Figure 2 Schematic diagram of the A-end leak detection of the single-channel multi-directional pressurization leak detection control system for valve low-temperature pressure testing

[0016] Figure 3 Schematic diagram of the B-end leak detection of the valve low-temperature pressure test single-channel multi-directional pressurization leak detection control system

[0017] Figure 4 Schematic diagram of the C-end leak detection of the valve low-temperature pressure test single-channel multi-directional pressurization leak detection control system

[0018] Figure 5 Structural diagram of four-way pressure distributor

[0019] Figure 6 Schematic diagram of the structure of the four-way pressure distributor in direction A

[0020] Figure 7 Structural diagram of three-way pressure distributor

[0021] Figure 8 Schematic diagram of the structure of the three-way pressure distributor in direction B

[0022] Figure 9 Schematic diagram of two-way support filter structure

[0023] Figure 10 Schematic diagram of the C-direction structure of a two-way support filter

[0024] In the figure: 1. System pressure source; 2. Pressure control valve; 3. Four-way pressure distributor; 3-1. Pressure gauge; 3-2. Pressure inlet; 3-3. Pressure outlet; 3-4. Pressure outlet; 3-5. Pressure outlet; 4. Normally open shut-off valve for line A; 5. Two-way support filter; 5-1. Pressure inlet; 5-2. Capillary filter hole; 5-3. Pressure outlet; 6. Pressure inlet valve A; 7. Three-way pressure distributor; 7-1. Pressure gauge; 7-2. Pressure outlet; 7-3, pressure outlet, 7-4, pressure inlet, 8, leak detection valve A; 9, normally open shut-off valve for line B; 10, two-way support filter; 11, pressure inlet valve B; 12, three-way pressure distributor; 13, leak detection valve B; 14, normally open shut-off valve for line C; 15, two-way support filter; 16, pressure inlet valve C; 17, three-way pressure distributor; 18, valve to be tested; 19, leak detection valve B; 20, line B; 21, line A; 22, line C. DETAILED DESCRIPTION

[0025] The following is a further description of this patent with reference to the accompanying drawings:

[0026] like Figure 1 、 Figures 5-10 As shown, the required pressure of the system is provided by the system pressure source 1, adjusted to the test pressure value by the pressure control valve 2, connected to the pressure inlet 3-2 on the four-way pressure distributor 3, and monitored by the pressure gauge 3-1 for entering the system pressure. The system pressure is divided into three pressure outlets 3-3 connected to the A line pipeline 21, the pressure outlet 3-4 connected to the B line pipeline 20, and the pressure outlet 3-5 connected to the C line pipeline 20. Among them, the A line pipeline 21 is connected to the A line normally open cut-off valve 4 to prevent the abnormal increase of the upstream pipeline pressure and provide double cut-off protection. It is also connected to the pressure inlet 5-1 on the two-way support filter 5, and the test medium is filtered through the capillary filter pore 5-2. The pressure outlet 5-3 is connected to the pressure inlet valve A 6 and then to the pressure inlet 7-4 on the three-way pressure distributor 7. The pressure enters the A line pipeline 21 through the keyway of the pressure gauge 7-1 to form a dual monitoring with the pressure gauge 3-1. The pressure outlet 7-2 is connected to one end of the valve to be tested 18, and the pressure outlet 7-3 is connected to the leak detection valve A. Similarly, the pressure outlet 3-4 on the four-way pressure distributor 3 is connected to the B-line pipeline 20, the pressure outlet 3-5 is connected to the C-line pipeline 20 and connected to the control original in the order of the A-line pipeline 21, and the outlet at one end of the three-way pressure distributor 12 is connected to the other end of the valve to be tested 18, and the outlet at one end of the three-way pressure distributor 17 is connected to the middle cavity of the valve to be tested 18, thereby forming a multi-directional pressurization and leak detection circuit.

[0027] like Figure 2As shown, after closing the pressure control valve 2, leak detection valve A8, pressure inlet valve B11, and pressure inlet valve C16, and opening the pressure inlet valve A6, leak detection valve B13, and leak detection valve C19, a circuit is formed in which pipeline A 21 applies pressure to one end of the valve, and pipeline C 22 detects leakage in the middle cavity of the valve. After slowly opening the pressure control valve 2 and the pressure rises to the specified value required by the test, a leak test is performed on the exhaust end of the leak detection valve C19 within the required test time. After completing the pressure test, close the pressure control valve 2 and open the leak detection valve A8 to release the test pressure.

[0028] like Figure 3 As shown, after completing the leak test on one end of the valve to be tested, close the pressure inlet valve A6, open the pressure inlet valve B11, form the B-line pipeline 20 to supply pressure to the other end of the valve, and the C-line pipeline 22 to the valve middle cavity leak test circuit, slowly open the pressure control valve 2 to increase the pressure to the specified value of the test requirement, and then perform a leak test on the venting end of the leak detection valve C19 within the required test time. After completing the pressure test, close the pressure control valve 2 and open the leak detection valve B13 to release the test pressure.

[0029] like Figure 4 As shown, after completing the leak test at both ends of the valve to be tested, close the pressure inlet valve B11 and the leak detection valve C19, open the pressure inlet valve C16, form the C-line pipeline 22 to pressurize the valve middle cavity, and the A-line pipeline 21 and the B-line pipeline 20 to detect leaks at both ends of the valve. Slowly open the pressure control valve 2 until the pressure rises to the specified value required by the test. At the same time, perform leak tests on the exhaust ends of the leak detection valve A8 and the leak detection valve B13 within the required test time. After completing the pressure test, close the pressure control valve 2 and open the leak detection valve B13 to release the test pressure.

[0030] The present invention has many other embodiments. Without departing from the principles of the present invention, those skilled in the art can make various corresponding changes based on the present invention, but these corresponding changes should all fall within the scope of the claims to which the present invention belongs.

Claims

1. A single-channel multi-directional pressurization leak detection control system for valve low-temperature pressure testing, characterized by: The system comprises a system pressure source (1), a pressure regulating valve (2), and a four-way pressure distributor (3) which are connected in sequence and then divided into three paths and then passed through a three-way pressure distributor (7) to form a pressure boosting and leak detection end, and respectively connected to the upstream end, the middle cavity, and the downstream end of the valve to be tested (18) to form a multi-directional pressure test switching circuit; Use the system pressure source (1) to provide pressure for the test circuit; The system pressure is controlled by a pressure control valve (2) and monitored by a pressure gauge (3-1) on a four-way pressure distributor (3), thereby forming three pressure sub-circuits. A three-way pressure sub-branch is used to filter the test medium using two-way support filters (5) respectively, and at the same time plays a supporting role for the test pipeline; The three sub-branches pass through a three-way pressure distributor (7) to form a pressurization end and a leak detection end; Normally open shut-off valves (4, 9, 14) are respectively provided on the three sub-branches to provide double shut-off protection in case of abnormal pressure increase at the upstream end; The two-way support filter (5) is a capillary filter hole (5-2); Close the pressure control valve (2), leak detection valve A (8), pressure inlet valve B (11), and pressure inlet valve C (16), and open the pressure inlet valve A (6), leak detection valve B (13), and leak detection valve C (19). Then, form a circuit where the A pipeline (21) pressurizes one end of the valve and the C pipeline (22) leaks in the middle cavity of the valve. Slowly open it. After the pressure of the pressure control valve (2) rises to the specified value required by the test, the leakage test is carried out on the emptying end of the leak detection valve C (19) within the required test time. After the pressure test is completed, the pressure control valve (2) is closed and the leak detection valve A (8) is opened to release the test pressure. After completing the leak test on one end of the valve to be tested, close the pressure inlet valve A (6), open the pressure inlet valve B (11), form the B-line pipeline (20) to pressurize the other end of the valve, and the C-line pipeline (22) to detect the leak in the valve cavity. Slowly open the pressure control valve (2) until the pressure rises to the specified value required by the test. Then, perform a leak test on the empty end of the leak detection valve C (19) within the required test time. After completing the pressure test, close the pressure control valve (2) and open the leak detection valve B (13) to release the test pressure. After completing the leak test at both ends of the valve to be tested, close the pressure inlet valve B (11) and the leak detection valve C (19), open the pressure inlet valve C (16), form the C-line pipeline (22) to pressurize the valve cavity, and the A-line pipeline (21) and the B-line pipeline (20) to form a leak detection circuit at both ends of the valve. Slowly open the pressure control valve (2) until the pressure rises to the specified value required by the test. At the same time, leak detection is carried out at the emptying end of the leak detection valve A (8) and the leak detection valve B (13) within the required test time. After completing the pressure test, close the pressure control valve (2) and open the leak detection valve B (13) to release the test pressure.

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