A device applied to the low-pressure sealing test of a compound high-speed intake and exhaust valve

Abstract

The present invention belongs to a test device, and particularly relates to a device applied to the low-pressure sealing test of a compound high-speed intake and exhaust valve. A device applied to the low-pressure sealing test of a compound high-speed intake and exhaust valve is provided with a "mouth"-shaped flow channel before the compound high-speed intake and exhaust valve to be tested, a unidirectional flow channel after the compound high-speed intake and exhaust valve, and stop valves are arranged both before and after the compound high-speed intake and exhaust valve. The remarkable effect of the present invention is that the present invention provides a device applied to the low-pressure sealing test of a compound high-speed intake and exhaust valve, which has a simple structure, is easy to operate, has a low cost, and can easily obtain a pressure of 0.02 MPa required for stable low-pressure sealing.

Description

Technical Field

[0001] The present invention belongs to a test device, and particularly relates to a device applied to the low-pressure sealing test of a composite high-speed intake and exhaust valve. Background Art

[0002] Section 6.12 of CJ / T 217-2005 "Composite High-Speed Intake and Exhaust Valve for Water Supply Pipelines" requires that the low-pressure water seal of the composite high-speed intake and exhaust valve be 0.02 MPa, with a holding pressure of 1 minute and no visible leakage; the same device is used for high-pressure water seal and low-pressure water seal, both in accordance with Appendix D in the standard: Water Pressure Sealing Test Device, and the following problems exist in specific use:

[0003] The pressure required for high-pressure water seal is very high. For example, for a valve with a pressure of 10 KG, the high-pressure water seal pressure required is 11 KG, that is, 0.11 MPa; the low-pressure water seal pressure is 0.02 MPa. According to the requirements for the selected pressure gauge, the range of the pressure gauge should be 1.5 - 3 times the test pressure. When measuring a stable pressure, the maximum working pressure should not exceed 2 / 3 of the range. For a valve with a pressure of 10 KG, a pressure gauge with a range of 0 - 0.4 MPa should be selected for the high-pressure water seal pressure, and a pressure gauge with a range of 0 - 0.06 MPa should be selected for the low-pressure water seal pressure of 0.02 MPa. Therefore, during the test, the corresponding range of the pressure gauge needs to be replaced according to the test item.

[0004] The pressure source used in this device is a booster pump. After reducing the pressure through a pressure reducing valve, the required test pressure is obtained. However, when actually performing the 0.02 MPa low-pressure water seal, as soon as the pressure reducing valve is opened, the pressure gauge will show an over-limit situation. Even if the pressurization is stopped, it is very difficult to obtain a stable pressure of 0.02 MPa. Summary of the Invention

[0005] The content of the present invention aims at the defects of the prior art and provides a device applied to the low-pressure sealing test of a composite high-speed intake and exhaust valve, which can easily obtain a stable pressure of 0.02 MPa required for low-pressure sealing.

[0006] The present invention is realized as follows: A device applied to the low-pressure sealing test of a composite high-speed intake and exhaust valve is provided with a "mouth"-shaped flow channel before the tested composite high-speed intake and exhaust valve, a one-way flow channel after the composite high-speed intake and exhaust valve, and stop valves are provided before and after the composite high-speed intake and exhaust valve.

[0007] For a device applied to the low-pressure sealing test of a composite high-speed intake and exhaust valve as described above, wherein the "mouth"-shaped flow channel is divided into an upper path and a lower path, and the composite high-speed intake and exhaust valve is connected to the convergence point of the upper and lower paths.

[0008] A device for low-pressure sealing test of a compound high-speed intake and exhaust valve as described above, wherein stop valves are respectively arranged on the upper and lower paths.

[0009] A device for low-pressure sealing test of a compound high-speed intake and exhaust valve as described above, wherein the "mouth"-shaped flow channel has a unique inlet.

[0010] A device for low-pressure sealing test of a compound high-speed intake and exhaust valve as described above, wherein a stop valve is arranged at the unique inlet.

[0011] A device for low-pressure sealing test of a compound high-speed intake and exhaust valve as described above, wherein a pressure reducing valve and a pressure gauge are arranged on the upper path.

[0012] A device for low-pressure sealing test of a compound high-speed intake and exhaust valve as described above, wherein the pressure reducing valve and the pressure gauge are arranged between the inlet stop valve and the upper path stop valve.

[0013] A device for low-pressure sealing test of a compound high-speed intake and exhaust valve as described above, wherein both the pressure reducing valve and the stop valve are products with a grade of 10KG.

[0014] The remarkable effect of the present invention is that the present invention provides a device for low-pressure sealing test of a compound high-speed intake and exhaust valve, which has a simple structure, is easy to operate, has a low cost, and can easily obtain the pressure of 0.02MPa required for stable low-pressure sealing. Description of the Drawings

[0015] Figure 1 It is a schematic diagram of the device of the present invention.

[0016] In the figure: 1. Stop valve, 2. Pressure reducing valve, 3. Pressure gauge, 4. Compound high-speed intake and exhaust valve, 5. Stop valve, 6. Stop valve, 7. Stop valve. Detailed Embodiments

[0017] The present invention will be further described below with reference to the drawings and embodiments.

[0018] A device of the present invention for low-pressure sealing test of a compound high-speed intake and exhaust valve. As Figure 1 shown, pipes, pressure reducing valves and stop valves with a pressure rating of 10KG are selected, and the caliber of all is 15mm; the inlet end is connected to the tap water pipeline, and tap water is used as the pressure source; the rapid water injection branch, the low-pressure acquisition branch and the drainage and pressure relief branch form the test device; the rapid water injection branch is composed of stop valve 1, stop valve 7 and the compound high-speed intake and exhaust valve (test piece) 4; the low-pressure acquisition branch is composed of stop valve 1, pressure reducing valve 2, pressure gauge 3, stop valve 5 and the test piece 4; the drainage and pressure relief branch is composed of the test piece 4 and stop valve 6.

[0019] The operation process is divided into three parts: rapid water injection, 0.02MPa low-pressure sealing test, and drainage and pressure relief. When rapidly injecting water, the pressure reducing valve 2, stop valve 5, and stop valve 6 are closed (note: the purpose of closing the pressure reducing valve 2 and stop valve 5 is to protect the pressure gauge 3. The pressure of tap water is generally about 0.4MPa, which exceeds the range of the pressure gauge 3). The stop valve 1 and stop valve 7 are opened to achieve rapid water inlet. For the 0.02MPa low-pressure sealing test, when the floating ball of the test piece 4 reaches the sealing surface position, the rapid water injection is completed. After the rapid water injection is completed, the stop valve 7 is closed, the stop valve 5 is opened, and the pressure reducing valve 2 is slowly opened for adjustment. Observe the reading of the pressure gauge 3 until the reading is 0.02MPa and stable. After maintaining the pressure for 1 minute, check whether there is visible leakage at the sealing surface of the test piece 4. If the observation result shows no visible leakage, the test passes; if there is, it fails. For drainage and pressure relief, the stop valve 1 is closed and the stop valve 6 is opened to achieve drainage and pressure relief.

Claims

1. An operating method for a device applied to the low-pressure sealing test of a compound high-speed intake and exhaust valve, characterized in that: The device includes a "mouth"-shaped flow channel arranged before the composite high-speed intake and exhaust valve (4) of the device under test, a unidirectional flow channel arranged after the composite high-speed intake and exhaust valve (4), and stop valves are arranged both before and after the composite high-speed intake and exhaust valve (4). The said "mouth"-shaped flow channel is divided into an upper path and a lower path, and the composite high-speed intake and exhaust valve (4) is connected to the convergence point of the upper and lower paths. An upper path stop valve (5) and a lower path stop valve (7) are respectively arranged on the upper and lower paths. The said "mouth"-shaped flow channel has a unique inlet. An inlet stop valve (1) is arranged at the unique inlet. A pressure reducing valve (2) and a pressure gauge (3) are arranged on the upper path. The said pressure reducing valve (2) and pressure gauge (3) are arranged between the inlet stop valve (1) and the upper path stop valve. The stop valves before and after the device under test are respectively the upper path stop valve (5) and the pressure relief stop valve (6). The rapid water injection branch is composed of the inlet stop valve (1), the lower path stop valve (7) and the device under test; the low-pressure acquisition branch is composed of the inlet stop valve (1), the pressure reducing valve (2), the pressure gauge (3), the upper path stop valve (5) and the device under test. The drainage and pressure relief branch is composed of the device under test and the pressure relief stop valve (6). The operation method is divided into three parts: rapid water injection, 0.02MPa low-pressure seal test and drainage and pressure relief; during rapid water injection, the pressure reducing valve (2), the upper path stop valve (5) and the pressure relief stop valve (6) are closed, and the inlet stop valve (1) and the lower path stop valve (7) are opened to achieve rapid water inlet; for the 0.02MPa low-pressure seal test, when the floating ball of the device under test reaches the sealing surface position, the rapid water injection is completed. After the rapid water injection is completed, the lower path stop valve (7) is closed, the upper path stop valve (5) is opened, the pressure reducing valve (2) is slowly opened for adjustment, and the reading of the pressure gauge (3) is observed until the reading is 0.02MPa and stable. After holding the pressure for 1 minute, check whether there is visible leakage at the sealing surface of the device under test. If the observation result is no visible leakage, the test passes; if there is, it fails; for drainage and pressure relief, the inlet stop valve (1) is closed and the pressure relief stop valve (6) is opened to achieve drainage and pressure relief.

2. The operating method of a device applied to the low-pressure sealing test of a compound high-speed intake and exhaust valve according to claim 1, characterized in that: The said pressure reducing valve (2) and stop valves are all selected as products with a grade of 10KG.

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