Valve flow coefficient and flow resistance coefficient testing device

Abstract

The utility model discloses a valve flow coefficient and flow resistance coefficient testing device which comprises a water storage tank and a valve testing device, a water outlet pipe of the water storage tank is connected with a water pump, an output end of the water pump is connected with a first connecting pipe, and one end of the first connecting pipe far away from the water pump is connected with the valve testing device. The valve testing device comprises a testing valve and a valve testing pipe, the testing valve is installed on the valve testing pipe, one end of the valve testing pipe is connected with the first connecting pipe, the other end of the valve testing pipe is connected with a backflow pipe, and a downward flow adjusting valve is installed on the backflow pipe. The end, away from the valve test tube, of the backflow tube is connected with the water storage tank, the two ends of the test valve are further provided with differential pressure measuring devices, the two ends of each measuring device are connected with the valve test tube, and the problems that a test device is poor in convenience, the stability and accuracy of a test result cannot be ensured due to the influence of a branch during detection, and the space is occupied are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve testing, in particular to a valve flow coefficient and flow resistance coefficient testing device. Background Art

[0002] The flow coefficient of a valve can measure the flow capacity of the valve. The flow resistance coefficient of a valve can measure the main power consumption of a power device. Therefore, the flow resistance coefficient test of a valve can provide reliable data for improving valve products and reducing power consumption for the reasonable design of fluid engineering systems.

[0003] Valve components are widely used in various fluid pipelines. Flow rate and flow resistance, as key performance parameters of valve components, often need to be tested. Existing valve flow coefficient and flow resistance coefficient test devices use a method of connecting multiple test loops in parallel in the valve test section. While improving the convenience of testing, there are the following disadvantages: 1. One loop can only test valves of one caliber specification. To test valves of multiple caliber specifications, multiple test loops need to be connected in parallel. When valves in other branches leak, the accuracy of the test results of the test loop will be affected; 2. The design of multiple branches will increase the fluctuation of the test medium inside the pipeline and affect the stability of the data; 3. The layout design of multiple test loops needs to occupy a larger test site space. A solution is proposed below to address the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a valve flow coefficient and flow resistance coefficient test device, which solves the problems of the existing test device proposed in the above background technology, such as poor convenience, being affected by branches during detection and unable to ensure the stability and accuracy of the test results, and occupying space.

[0005] The above technical objectives of the utility model are achieved through the following technical solutions:

[0006] A valve flow coefficient and flow resistance coefficient testing device comprises a water tank and a valve testing device, wherein the water outlet pipe of the water tank is connected to a water pump, the output end of the water pump is connected to a connecting pipe 1, the end of the connecting pipe 1 away from the water pump is connected to the valve testing device, a flow meter, a thermometer and an upstream valve are sequentially installed on the connecting pipe 1, the valve testing device comprises a test valve and a valve testing tube, the test valve is installed on the valve testing tube, one end of the valve testing tube is connected to the connecting pipe 1, the other end of the valve testing tube is connected to a reflux pipe, a downstream regulating valve is installed on the reflux pipe, the end of the reflux pipe away from the valve testing tube is connected to the water tank, pressure difference measuring devices are also arranged at both ends of the test valve, and the two ends of the measuring device are respectively connected to the valve testing tube.

[0007] Preferably, the valve test pipe includes a main circuit pipe, a connecting pipe 2, an upstream pressure-taking pipe and a downstream pressure-taking pipe. The main circuit pipe, the connecting pipe 2 and the upstream pressure-taking pipe are connected in sequence through flanges. The end of the upstream pressure-taking pipe away from the connecting pipe 2 is connected to the test valve, and the end of the test valve away from the upstream pressure-taking pipe is connected to the downstream pressure-taking pipe.

[0008] Preferably, the main circuit pipe adopts a DN300 stainless steel pipeline, and the connecting pipe 2 can adopt any one of 8 specifications of reducers from DN300-DN50 / 65 / 80 / 100 / 125 / 150 / 200 / 250 or a DN300-DN300 pipeline.

[0009] Preferably, the differential pressure measuring device comprises a differential pressure gauge, which is respectively installed on the upstream pressure taking pipe and the downstream pressure taking pipe. A plurality of differential pressure gauges are installed on the upstream pressure taking pipe, so that the upstream pressure taking pipe can be inspected in multiple sections.

[0010] Preferably, the valve test pipe is connected to the connecting pipe 1 and the reflux pipe by flanges, and the test valve and the valve test pipe are also connected by flanges.

[0011] Beneficial effects: The present application can achieve the test of valves of multiple caliber specifications by 1. using one loop; 2. having only one test loop without the influence of branches, thus ensuring the stability and accuracy of the test results; 3. having a compact structure, occupying less space, thus saving space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the prior art;

[0013] Figure 2 It is a structural schematic diagram of this embodiment;

[0014] Figure 3 This is a schematic diagram of the structure of one group of valve test tubes used in the embodiment;

[0015] Figure 4 The embodiment is used to show the structural schematic diagram of another group of valve test tubes.

[0016] Figure numerals: 1. Water storage tank; 2. Valve test device; 3. Water pump; 4. Connecting pipe one; 5. Flow meter; 6. Thermometer; 7. Upstream valve; 8. Test valve; 9. Valve test pipe; 10. Return pipe; 11. Downstream regulating valve; 12. Pressure difference measuring device; 13. Main loop pipe; 14. Connecting pipe two; 15. Upstream pressure taking pipe; 16. Downstream pressure taking pipe 17. Pressure difference gauge. DETAILED DESCRIPTION

[0017] See Figures 1 to 4 As shown, a valve flow coefficient and flow resistance coefficient test device includes a water tank 1 and a valve test device 2. The water outlet pipe of the water tank 1 is connected to a water pump 3. The output end of the water pump 3 is connected to a connecting pipe 4. The end of the connecting pipe 4 away from the water pump 3 is connected to the valve test device 2. A flow meter 5, a thermometer 6 and an upstream valve 7 are sequentially installed on the connecting pipe 4. When testing, the water pump 3 can be turned on, and the water in the water tank 1 can be pumped out through the water pump 3 and discharged into the connecting pipe 4. The liquid flow in the connecting pipe 4 can be detected by the flow meter 5, and the temperature of the liquid can be detected by the thermometer 6. The upstream valve 7 is opened to allow the liquid to enter the valve test device 2 for testing.

[0018] The valve testing device 2 includes a testing valve 8 and a valve testing tube 9. The testing valve 8 is installed on the valve testing tube 9. One end of the valve testing tube 9 is connected to the connecting tube 4. The other end of the valve testing tube 9 is connected to a return pipe 10. A downstream regulating valve 11 is installed on the return pipe 10. The end of the return pipe 10 away from the valve testing tube 9 is connected to the water storage tank 1. The liquid will enter the valve testing tube 9, flow through the test valve 8 through the valve testing tube 9, and then enter the return pipe 10. By opening the downstream regulating valve 11 on the return pipe 10, the liquid can return to the liquid storage tank.

[0019] The valve test pipe 9 includes a main circuit pipe 13, a connecting pipe 14, an upstream pressure pipe 15 and a downstream pressure pipe. The main circuit pipe 13, the connecting pipe 14 and the upstream pressure pipe 15 are connected in sequence through flanges. The end of the upstream pressure pipe 15 away from the connecting pipe 14 is connected to the test valve 8, and the end of the test valve 8 away from the upstream pressure pipe 15 is connected to the downstream pressure pipe. The main circuit pipe 13 adopts a DN300 stainless steel pipeline, and the connecting pipe 14 can adopt DN300-DN50 / 65 / 80 / 100 / 125 / 150 / 200 / 250, a total of 8 kinds of reducers or DN300-DN300 pipelines. In the valve test section, 8 kinds of reducers and DN300-DN50 / 65 / 80 / 100 / 125 / 150 / 200 / 250, and DN300-DN300 pipelines, as well as upstream and downstream pressure pipes, a total of 9 sets of test pipelines with caliber specifications are used, which can complete the test of valves with 9 caliber specifications of DN50-DN300. When testing the valve, select the pipeline with the same caliber size as the valve for connection. The valve test pipe 9 is connected with the connecting pipe 4 and the return pipe 10 by flanges. The test valve 8 and the valve test pipe 9 are also connected by flanges. The pipelines are connected by flanges to facilitate disassembly and replacement, so that different test valves 8 can be tested.

[0020] See Figure 3When testing the DN50 valve, the DN300 main loop pipe 13, DN300-DN50 reducer, DN50 upstream pressure pipe 15, test valve 8 and DN50 downstream pressure pipe can be installed to achieve connection, and the test can be achieved with the corresponding testing instruments. For the DN65 / 80 / 100 / 125 / 150 / 200 / 250 valve tests, except for the different specifications of the pipelines, the methods used are the same.

[0021] See Figure 4 When testing a DN300 valve, the valve test pipe 9 can be connected by the installation method of DN300 main loop, DN300-DN300 straight pipe, DN300 upstream pressure pipe 15, test valve 8 and DN300 downstream pressure pipe, and the test can be realized by cooperating with corresponding detection instruments.

[0022] A differential pressure measuring device 12 is also provided at both ends of the test valve 8. Both ends of the measuring device are connected to the valve test pipe 9 respectively. The differential pressure measuring device 12 includes a differential pressure gauge, which is respectively installed on the upstream pressure taking pipe 15 and the downstream pressure taking pipe. A plurality of differential pressure gauges are installed on the upstream pressure taking pipe 15, so that the upstream pressure taking pipe 15 can be tested in multiple sections. By designing the differential pressure gauge, the differential pressure of the test pipeline can be detected.

[0023] Valve test process:

[0024] (1) Install the test valve, open it, start the test system water injection pump, exhaust all the air in the pipe and fill it with water. Then close the water injection pump and start the test water pump.

[0025] (2) The test valve is at a certain opening position, and when the flow state meets the fluctuation requirements, a test record is made.

[0026] (3) When there is a test pipe with the same length and specifications as the test pipes before and after the test valve that can be used for differential pressure testing, the differential pressure of this section should be tested and recorded simultaneously; when there is no test pipe with the same length and specifications that can be tested simultaneously, after the test valve test is completed, the test valve should be removed, the test pipes should be connected together, and the differential pressure of the test pipes should be measured according to the test procedure and flow point of the tested valve.

[0027] (4) For products without special instructions, the test of flow resistance coefficient and flow coefficient should be carried out when the product is in the fully open position. The maximum flow capacity of the test device should be tested. The test record should be no less than 5 flow rates (unless there are special requirements), and the change of each flow value should be no less than 10%. The maximum flow rate should be the upper limit of the operating range specified by the test valve manufacturer, and no vaporization should occur at this flow rate.

[0028] The test data should record flow rate, upstream pressure, valve measuring section differential pressure, measuring pipe differential pressure and other data.

[0029] (5) Except for valves whose valve core position changes with flow, the deviation between the maximum and minimum values ​​of the flow coefficient of other valves at any opening position, given the minimum flow, maximum flow and the average flow state between the minimum flow and maximum flow, should not exceed 2%.

[0030] (6) Depending on the type of valve, different methods can be selected for testing. For products without special instructions, the test data can be: set the flow rate in the pipeline to read the differential pressure at the measuring point, or set the differential pressure at the measuring point to read the flow rate in the pipeline.

Claims

1. A valve flow coefficient and flow resistance coefficient testing device, comprising a water storage tank (1) and a valve testing device (2), characterized in that: The water outlet pipe of the water storage tank (1) is connected to a water pump (3), the output end of the water pump (3) is connected to a connecting pipe (4), the end of the connecting pipe (4) away from the water pump (3) is connected to the valve test device (2), a flow meter (5), a thermometer (6) and an upstream valve (7) are installed on the connecting pipe (4) in sequence, the valve test device (2) comprises a test valve (8) and a valve test pipe (9), the test valve (8) is installed on the valve test pipe (9), one end of the valve test pipe (9) is connected to the connecting pipe (4), the other end of the valve test pipe (9) is connected to a return pipe (10), a downstream regulating valve (11) is installed on the return pipe (10), the end of the return pipe (10) away from the valve test pipe (9) is connected to the water storage tank (1), and pressure difference measuring devices (12) are also arranged at both ends of the test valve (8), and the two ends of the measuring device are respectively connected to the valve test pipe (9).

2. A valve flow coefficient and flow resistance coefficient test device according to claim 1, characterized in that: The valve test pipe (9) comprises a main circuit pipe (13), a second connecting pipe (14), an upstream pressure-taking pipe (15) and a downstream pressure-taking pipe (16); the main circuit pipe (13), the second connecting pipe (14) and the upstream pressure-taking pipe (15) are connected in sequence via flanges; an end of the upstream pressure-taking pipe (15) away from the second connecting pipe (14) is connected to the test valve (8); and an end of the test valve (8) away from the upstream pressure-taking pipe (15) is connected to the downstream pressure-taking pipe (16).

3. A valve flow coefficient and flow resistance coefficient testing device according to claim 2, characterized in that: The main circuit pipe (13) is a DN300 stainless steel pipe, and the second connecting pipe (14) can be any one of 8 types of reducers, DN300-DN50 / 65 / 80 / 100 / 125 / 150 / 200 / 250, or a DN300-DN300 pipe.

4. A valve flow coefficient and flow resistance coefficient testing device according to claim 2, characterized in that: The differential pressure measuring device (12) comprises a differential pressure gauge (17), which is respectively installed on the upstream pressure taking pipe (15) and the downstream pressure taking pipe (16). A plurality of differential pressure gauges (17) are installed on the upstream pressure taking pipe (15), so that the upstream pressure taking pipe (15) can be tested in multiple sections.

5. A valve flow coefficient and flow resistance coefficient testing device according to claim 1, characterized in that: The valve test pipe (9) is connected to the connecting pipe 1 (4) and the return pipe (10) by flanges, and the test valve (8) and the valve test pipe (9) are also connected by flanges.

Images