Electric valve air tightness test device

Abstract

The utility model discloses an air tightness test device for an electrically operated valve, which is connected with a pressure gas source for supplying pressure gas for test through a gas supply pipeline and comprises a master control valve, and a pressure regulation and stabilization module, a field pressure gauge, a valve test branch and a test safety valve are sequentially communicated on the gas supply pipeline on the gas outlet side of the master control valve. The end parts of the at least two valve test branches are respectively used for being detachably connected with the test electric valves; each valve test branch and the test safety valve are arranged on the gas supply pipeline at the rear side of the field pressure gauge in parallel; the pressure adjusting and stabilizing module can automatically maintain the stability of the test pressure, and can flexibly adjust according to different test pressure requirements, and the adjustment is simple and convenient; due to the fact that a plurality of valve test branches can be arranged, air tightness tests can be carried out on a plurality of test electric valves at the same time, the test efficiency is high, test electric valves of different models can be tested in batches by adjusting test pressure, and the universality of test circuits is improved.

Description

Technical Field

[0001] This utility model relates to the field of electric valve testing technology, and in particular to an electric valve airtightness testing device. Background Technology

[0002] Electric valves typically consist of an electric actuator and a valve. They use electrical energy as power and drive the valve to operate through the electric actuator, thereby controlling the opening and closing of the valve and thus controlling the flow of the pipeline. Before installation and use, electric valves need to undergo simulated operation and pressure tests, with the pressure test specifically referring to the airtightness test.

[0003] Currently, when conducting airtightness tests on electric valves, the large number of electric valve models and the different test pressures used for different models make it inconvenient to adjust a single test line when testing different models of electric valves. Furthermore, the test pressure is unstable during the test, and each electric valve needs to be disassembled and tested sequentially, resulting in low testing efficiency and limited versatility of the test line. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an electric valve airtightness testing device that is easy to adjust, has good pressure stabilization effect, can realize batch testing of valves, and has high testing efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: an electric valve airtightness testing device, which is connected to a pressure gas source for supplying test pressure gas through a gas supply pipeline, including a main control valve installed on the gas supply pipeline. A pressure regulating and stabilizing module, a field pressure gauge, a valve test branch and a test safety valve are sequentially connected to the gas supply pipeline on the outlet side of the main control valve. The valve test branch is configured with at least two branches, and the ends of each branch are used for detachable connection of the test electric valve. Each valve test branch and the test safety valve are arranged in parallel on the gas supply pipeline behind the field pressure gauge.

[0006] As a preferred technical solution, the pressure regulation and stabilization module includes a programmable controller, and a human-machine interaction unit, an electric pressure regulating valve, a pressure detection unit and an electric pressure relief valve are connected to the programmable controller. The electric pressure regulating valve, the pressure detection unit and the electric pressure relief valve are sequentially arranged on the gas supply pipeline on the gas outlet side of the main control valve.

[0007] As a preferred technical solution, a pressure relief branch is connected to the air supply pipeline on the rear side of the pressure detection unit, the electric pressure relief valve is connected to the pressure relief branch, and the pressure relief branch and each of the valve test branches are respectively connected in parallel to the air supply pipeline.

[0008] As a preferred technical solution, the human-machine interaction unit is configured as a touch screen; the pressure detection unit is configured as a pressure transmitter.

[0009] As a preferred technical solution, the valve test branch includes a test branch pipe, on which a test control valve and a test quick connector are connected in series along the direction of travel of the test pressure gas. A transparent short section is provided corresponding to the test quick connector for use, and the transparent short section is filled with test water.

[0010] As a preferred technical solution, the main control valve and the test control valve are respectively configured as manual shut-off valves.

[0011] As a preferred technical solution, the pressure gas used in the test is compressed nitrogen.

[0012] As an improvement to the above technical solution, the test electric valve is set as a petrochemical electric valve, and the model is DN15~DN200. All the petrochemical electric valves in the test are of the same model.

[0013] Due to the adoption of the above technical solution, the electric valve airtightness testing device is connected to a pressure gas source for supplying test pressure gas through a gas supply pipeline. It includes a main control valve installed on the gas supply pipeline. A pressure regulating and stabilizing module, a field pressure gauge, a valve test branch, and a test safety valve are sequentially connected to the gas supply pipeline on the outlet side of the main control valve. The valve test branch is configured with at least two branches, each with its end for detachable connection to a test electric valve. Each valve test branch and the test safety valve are connected in parallel on the gas supply pipeline downstream of the field pressure gauge. This invention has the following advantages: the pressure regulating and stabilizing module can automatically increase and adjust the pressure when the test pressure is insufficient, and automatically release the pressure when the test pressure exceeds the limit, thereby automatically maintaining the stability of the test pressure. It can also be flexibly adjusted according to different test pressure requirements, making adjustment simple and convenient. Because multiple valve test branches can be set up, airtightness tests on multiple test electric valves can be performed simultaneously, resulting in high testing efficiency. Different models of test electric valves can also be tested in batches by adjusting the test pressure, improving the versatility of the test circuit. Attached Figure Description

[0014] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0015] Figure 1 This is a simplified structural diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a schematic diagram of the test fixed state of the test electric valve in an embodiment of this utility model;

[0017] In the diagram: 1-Gas supply line; 2-Main control valve; 3-Field pressure gauge; 4-Test safety valve; 5-Test electric valve; 6-Programmable controller; 7-Human-machine interface unit; 8-Electric pressure regulating valve; 9-Pressure detection unit; 10-Electric pressure relief valve; 11-Pressure relief branch; 12-Test branch pipe; 13-Test control valve; 14-Test quick connector; 15-Transparent short section. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0019] like Figure 1 As shown, the electric valve airtightness testing device is used to conduct airtightness tests on electric valves. It is connected to a pressurized gas source for supplying the test pressurized gas through a gas supply pipeline 1. In this embodiment, the test electric valve 5 is a petrochemical electric valve, and the test pressurized gas is compressed nitrogen. The airtightness test of the petrochemical electric valve is carried out before its installation and use. In the petrochemical field, air compressor stations are generally equipped to produce compressed nitrogen, making gas supply convenient and eliminating the need for additional gas source equipment, which helps reduce testing costs. In addition, nitrogen has the advantages of being non-flammable, non-explosive, and highly safe, which can significantly reduce the safety risk factor during the test. Moreover, as an inert gas, nitrogen will not corrode or damage the valve material, nor will it cause pollution to the valve material, making it particularly suitable for testing electric valves used in petrochemical industries.

[0020] This embodiment includes a main control valve 2 installed on the gas supply pipeline 1. The main control valve 2 controls the on / off state of the entire gas supply pipeline 1 and is configured as a manual shut-off valve, ensuring reliable and safe operation. A pressure regulating and stabilizing module, a field pressure gauge 3, a valve test branch, and a test safety valve 4 are sequentially connected to the gas supply pipeline 1 on the outlet side of the main control valve 2. The valve test branch has at least two branches, each with its end detachably connected to a test electric valve 5. Each valve test branch and the test safety valve 4 are connected in parallel on the gas supply pipeline 1 downstream of the field pressure gauge 3. Each valve test branch can test one test electric valve 5, allowing the test circuit formed in this embodiment to simultaneously test multiple test electric valves 5 of the same model. This embodiment can test petrochemical electric valves ranging from DN15 to DN200, and can provide at least ≤0.8MPa of compressed nitrogen. To ensure the accuracy of the tests on the petrochemical electric valves, the models of all the petrochemical electric valves undergoing the tests must be consistent. The test safety valve 4 is used to prevent overpressure during the test, thus ensuring the safety of the entire test circuit.

[0021] The pressure regulation and stabilization module includes a programmable controller (PLC) 6, connected to a human-machine interface unit (HMI) 7, an electric pressure regulating valve 8, a pressure detection unit 9, and an electric pressure relief valve 10. The electric pressure regulating valve 8, pressure detection unit 9, and electric pressure relief valve 10 are sequentially located on the gas supply pipeline 1 on the outlet side of the main control valve 2. The PLC 6 can be configured as a PLC or a PIC. The HMI 7 is a touchscreen used to set or adjust the standard test pressure value stored in the PLC 6, ensuring it corresponds to the model and total gas consumption of the petrochemical electric valve. The pressure detection unit 9 is a pressure transmitter used to detect the nitrogen pressure in the gas supply pipeline 1.

[0022] The programmable controller 6 uses pressure as a control signal. It receives the detection signal from the pressure transmitter and compares it with the test standard pressure value stored inside the programmable controller 6. Based on the comparison result, it controls the electric pressure regulating valve 8 and the electric pressure relief valve 10 to achieve the function of safety protection or automatic internal pressure regulation of the gas supply pipeline 1.

[0023] Specifically, when the pressure transmitter's detected value is less than the standard test pressure, the programmable controller 6 increases the opening of the electric pressure regulating valve 8, and the gas supply pressure of the gas supply line 1 corresponds to and remains stable with the standard test pressure. When the compressed nitrogen pressure in the gas supply line 1 exceeds the standard test pressure, the programmable controller 6 opens the electric pressure relief valve 10 to reduce the pressure. Simultaneously, it can appropriately close the opening of the electric pressure regulating valve 8 to keep the gas supply pressure within the control range, thereby achieving automatic adjustment and stable control of the gas supply pressure. After the airtightness test of the electric test valve 5 is completed, the main control valve 2 can be manually closed, and the test circuit can be depressurized and vented through the electric pressure relief valve 10.

[0024] In this embodiment, a pressure relief branch 11 is connected to the air supply line 1 on the rear side of the pressure detection unit 9. The electric pressure relief valve 10 is connected to the pressure relief branch 11, and the pressure relief branch 11 and each of the valve test branches are connected in parallel to the air supply line 1, so that the pressure relief of the electric pressure relief valve 10 has little impact on the main test line and avoids affecting the stability of the air supply.

[0025] like Figure 1 and Figure 2 As shown, the valve test branch includes a test branch pipe 12. A test control valve 13 and a test quick-connect fitting 14 are connected in series along the direction of travel of the test pressurized gas on the test branch pipe 12. The test control valve 13 is also a manual shut-off valve. A transparent short section 15 is provided corresponding to the test quick-connect fitting 14 for use. The transparent short section 15 is filled with test water. The transparent short section 15 can be a transparent oil pipe short section, which is readily available. A certain height, such as 10 mm, of pure water can be injected into the transparent short section 15 as the test water, minimizing adverse effects on the valve. The transparent short section 15 can be made of transparent plexiglass for easy bubble observation. The specific structures of the test quick-connect fitting 14 and the transparent short section 15 are well known to those skilled in the art and will not be described in detail here.

[0026] The test quick-connector 14 can be mounted on the testing platform. Multiple test branches 12 can be installed to simultaneously test the test electric valves 5 of the same pressure rating. (For simplified viewing,...) Figure 1 The middle section is equipped with two test branch pipes 12. For example... Figure 2As shown, the test quick-connect fitting 14 can be configured as a clamp fitting. During the test, the test electric valve 5 is fixedly connected to the test branch pipe 12 using the test quick-connect fitting 14, with its outlet end vertically upward and the channel closed (even if the test electric valve 5 is in the closed state). The test medium, i.e., compressed nitrogen, is introduced. When the test pressure reaches the rated pressure and is maintained for a specified time, the degree of leakage and the number of bubbles within the specified time are observed through the transparent short section 15. The airtightness is checked against GB / T 26480 "Inspection and Testing of Valves" to verify whether it is qualified, or the leakage level is determined by referring to ISO 5208 "Industrial Valves - Pressure Testing of Metal Valves".

[0027] The description of this utility model is given for illustrative and descriptive purposes only, and is not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the utility model, and to enable those skilled in the art to understand the utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. An electric valve airtightness testing device, connected to a pressure gas source for supplying test pressure gas via a gas supply pipeline, including a main control valve installed on the gas supply pipeline, characterized in that: The gas supply pipeline on the outlet side of the main control valve is sequentially connected to a pressure regulating and stabilizing module, a field pressure gauge, a valve test branch, and a test safety valve. The valve test branch is configured with at least two branches, each with its end used for detachable connection to a test electric valve. Each valve test branch and the test safety valve are connected in parallel on the gas supply pipeline behind the field pressure gauge.

2. The electric valve airtightness testing device as described in claim 1, characterized in that: The pressure regulation and stabilization module includes a programmable controller, and a human-machine interface unit, an electric pressure regulating valve, a pressure detection unit, and an electric pressure relief valve are connected to the programmable controller. The electric pressure regulating valve, the pressure detection unit, and the electric pressure relief valve are sequentially located on the gas supply pipeline on the gas outlet side of the main control valve.

3. The electric valve airtightness testing device as described in claim 2, characterized in that: A pressure relief branch is connected to the air supply pipeline behind the pressure detection unit. The electric pressure relief valve is connected to the pressure relief branch, and the pressure relief branch and each of the valve test branches are connected in parallel to the air supply pipeline.

4. The electric valve airtightness testing device as described in claim 2, characterized in that: The human-computer interaction unit is configured as a touch screen; the pressure detection unit is configured as a pressure transmitter.

5. The electric valve airtightness testing device as described in claim 1, characterized in that: The valve test branch includes a test branch pipe, on which a test control valve and a test quick connector are connected in series along the direction of travel of the test pressure gas. A transparent short section is provided corresponding to the test quick connector and is filled with test water.

6. The electric valve airtightness testing device as described in claim 5, characterized in that: The main control valve and the test control valve are both configured as manual shut-off valves.

7. The electric valve airtightness testing device as described in claim 1, characterized in that: The pressurized gas used in the experiment was compressed nitrogen.

8. The electric valve airtightness testing device as described in claim 1, characterized in that: The test electric valves were set as petrochemical electric valves, with models ranging from DN15 to DN200, and all the petrochemical electric valves used in the test had the same model.

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