Three-way valve flow characteristic testing device and method

Abstract

The invention belongs to the technical field of three-way valve characteristic detection, and discloses a three-way valve flow characteristic testing device and method.The three-way valve flow characteristic testing device comprises a water pump system and a testing system; the water pump system is provided with an outlet, the test system comprises two input pipelines, a detection position and an output pipeline, the detection position is used for installing a to-be-tested three-way valve, each input pipeline comprises a first pressure reducing valve, a first switch valve and a first flow meter which are sequentially connected in series, and the input ends of the two input pipelines are correspondingly communicated with the outlet respectively; the output end is communicated with two water inlets of a three-way valve, a water outlet of the three-way valve is communicated with an output pipeline, the output pipeline comprises a second flowmeter and a single-seat adjusting valve which are sequentially connected in series, and first pressure gauges are installed at the water inlets and the water outlets of the three-way valve. The first pressure reducing valve is matched with the single-seat adjusting valve, so that a stable and ideal pressure environment can be provided at the water inlet and the water outlet of the three-way valve to be detected, and the accuracy of a detection result is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of three-way valve characteristic detection, and particularly to a three-way valve flow characteristic testing device and method. Background Art

[0002] A three-way confluence valve, i.e., a three-way valve with two water inlets and one water outlet, is widely used in industrial automation control systems to regulate and control parameters such as the flow rate, pressure, and liquid level of the medium in the pipeline. Currently, in the valve industry, there is no general device and method for testing the flow characteristics of three-way valves. The existing testing of the flow characteristics of three-way valves usually uses a two-way valve flow bench. One of the water inlets is blocked by a blanking plate, and then a flow test is carried out and the flow characteristic curve of the three-way valve is drawn. However, since the two internal water inlet paths of the three-way valve interfere with each other during actual use, the flow characteristic curve measured by using a two-way valve test bench cannot truly reflect the flow characteristics of the three-way valve during actual operation, and it is difficult to ensure the accuracy of the test results. Summary of the Invention

[0003] The purpose of the present invention is to provide a three-way valve flow characteristic testing device that can test the flow characteristics of the double-flow path or single-flow path of the three-way valve and ensure the accuracy of the detection results.

[0004] To achieve this purpose, the present invention adopts the following technical solutions: A three-way valve flow characteristic testing device includes a water pump system and a testing system. The water pump system has two outlets; the testing system includes two input pipelines, a detection position, and an output pipeline. The detection position is used for installing the three-way valve to be tested. The input pipeline includes a first pressure reducing valve, a first switching valve, and a first flow meter connected in series in sequence. The input ends of the two input pipelines are respectively connected in communication with the corresponding outlets, and the output ends are respectively connected in communication with the two water inlets of the three-way valve. The water outlet of the three-way valve is connected in communication with the output pipeline. The output pipeline includes a second flow meter and a single-seat regulating valve connected in series in sequence. First pressure gauges are installed at both the water inlet and the water outlet of the three-way valve.

[0005] Preferably, a shunt branch is connected in parallel to the input pipeline. The input end of the shunt branch is connected in communication between the first pressure reducing valve and the first switching valve, and the output end is connected in communication between the first flow meter and the three-way valve. The diameter of the shunt branch is smaller than that of the input pipeline. The shunt branch includes a second switching valve and a third flow meter connected in series.

[0006] Preferably, there are two second switching valves, and the two second switching valves are respectively connected to both ends of the third flow meter.

[0007] Preferably, the three-way valve flow characteristic testing device further includes a controller. Pressure transmitters are installed at both the water inlet and the water outlet of the three-way valve. The first flowmeter, the second flowmeter, and the pressure transmitters are all communicatively connected to the controller.

[0008] Preferably, a third switching valve is connected between the input pipeline and the outlet.

[0009] Preferably, the output end of the single-seat regulating valve is communicated with the water pump system through a return pipeline, and a fourth switching valve is provided on the return pipeline.

[0010] Preferably, the water pump system includes a pump house, a fifth switching valve, a pressure stabilizing tank, and a second pressure reducing valve that are connected in sequence from beginning to end. The two outlets are arranged on the pressure stabilizing tank.

[0011] Preferably, the pressure stabilizing tank is further connected with a pressurizing system, and the pressurizing system includes a gas source and a buffer tank connected in series in sequence.

[0012] Preferably, a third pressure reducing valve is connected between the gas source and the buffer tank.

[0013] Another object of the present invention is to provide a three-way valve flow characteristic testing method, which can simulate the interference situation between two water inlets under the actual use conditions of the three-way valve and truly reflect the flow characteristics of the three-way valve during actual operation.

[0014] To achieve this purpose, the present invention adopts the following technical solutions: A three-way valve flow characteristic testing method is implemented through the above-mentioned three-way valve flow characteristic testing device, and is characterized by including the following steps:

[0015] Open the single-seat regulating valve and the first switching valve to make both the input pipeline and the output pipeline conductive;

[0016] Control one of the water inlets of the three-way valve; and / or, open the other water inlet;

[0017] Close the first switching valve connected to the water inlet of the three-way valve that is not opened, control the single-seat regulating valve to be fully open, adjust the opening of the three-way valve to 50%, and then adjust the first pressure reducing valve corresponding to the opened water inlet of the three-way valve so that the input pipeline corresponding to the opened water inlet of the three-way valve reaches a preset pressure value;

[0018] Adjust the opening of the three-way valve from 50% to 0%, and then adjust it from 0% to 100% at a preset adjustment amplitude, record the pressure values and flow values of the opened water inlet and water outlet of the three-way valve after each adjustment, and draw a Kv curve.

[0019] Advantages of the present invention: By providing a first pressure reducing valve and a first switching valve, after the user opens the first switching valve and adjusts the first pressure reducing valve, the pressure of the corresponding input pipeline can be adjusted to a preset pressure, and the pressure of the input pipeline can be maintained stable under the feedback adjustment of the first pressure reducing valve, eliminating the influence of the pressure drop of the input pipeline, and providing an ideal test environment when the three-way valve is used to simulate a single flow path or a double flow path. By providing a single-seat regulating valve, when the user manually adjusts the single-seat regulating valve to be fully open, the outlet pressure of the three-way valve can approach the system back pressure, providing a stable outlet pressure environment for the three-way valve to be tested, and ensuring that the flow distribution at the inlet of the three-way valve changes only according to the opening of the three-way valve. The cooperation of the first pressure reducing valve and the single-seat regulating valve can provide a stable and ideal pressure environment at the water inlet and outlet of the three-way valve to be tested, reduce the influence of the characteristics of each pipeline except the three-way valve, improve the correlation between the test data and the inherent characteristics of the valve, and effectively improve the accuracy of the detection result.

[0020] The present invention also provides a method for testing the flow characteristics of a three-way valve, which can simultaneously measure the flow characteristics when the three-way valve is in a double flow path for introducing a medium, and can also separately measure the flow characteristics of the three-way valve in a single flow path, and can eliminate the interference of environmental factors such as pipeline pressure drop and pressure fluctuation, ensuring the authenticity and accuracy of the detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the circuit diagram of the three-way valve flow characteristic test device according to an embodiment of the present invention;

[0022] Figure 2 is the circuit diagram of the test system according to an embodiment of the present invention;

[0023] Figure 3 is the circuit diagram of the water pump system according to an embodiment of the present invention;

[0024] Figure 4 is the circuit diagram of the pressurization system according to an embodiment of the present invention;

[0025] Figure 5 is the step flow chart of the method for testing the flow characteristics of a three-way valve according to an embodiment of the present invention.

[0026] In the figure:

[0027] 100, water pump system; 110, pump house; 120, fifth switching valve; 130, pressure stabilizing tank; 140, second pressure reducing valve; 150, filter; 160, sixth switching valve;

[0028] 200, Test system; 210, Input pipeline; 211, First pressure reducing valve; 212, First switching valve; 213, First flowmeter; 214, Third switching valve; 220, Three-way valve; 221, First pressure gauge; 222, Pressure transmitter; 230, Output pipeline; 231, Second flowmeter; 232, Single-seat regulating valve; 233, Return pipeline; 234, Fourth switching valve; 235, Second pressure gauge; 240, Shunt branch; 241, Second switching valve; 242, Third flowmeter;

[0029] 300, Boosting system; 310, Gas source; 320, Buffer tank; 330, Third pressure reducing valve. Specific embodiments

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all structures.

[0031] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0034] Referring to Figures 1 to 4 As shown, a three-way valve flow characteristic test device provided according to an embodiment of the present application includes a water pump system 100 and a test system 200. The water pump system 100 has two outlets, and each outlet can provide a flowing medium with stable pressure; the test system 200 includes two input pipelines 210, a detection position, and an output pipeline 230. The detection position is used to install the three-way valve 220 to be tested. Optionally, according to the different shapes of the valve cores of the three-way valve 220 to be tested, the flow curves can be in four ideal flow curves such as quick-opening type, linear type, parabolic type, or equal percentage type, etc. The shape of the valve core of the three-way valve 220 to be tested is not specifically limited here. The input pipeline 210 includes a first pressure reducing valve 211, a first switching valve 212, and a first flowmeter 213 connected in series in sequence. The input ends of the two input pipelines 210 are respectively connected in communication with the outlets, and the output ends are respectively connected in communication with the two water inlets of the three-way valve 220. The water outlet of the three-way valve 220 is connected in communication with the output pipeline 230. The output pipeline 230 includes a second flowmeter 231 and a single-seat regulating valve 232 connected in series in sequence. First pressure gauges 221 are installed at both the water inlet and the water outlet of the three-way valve 220. The first flowmeter 213 and the first pressure gauge 221 at the water inlet can detect the flow rate and pressure at the water inlet of the three-way valve 220 in real time. The second flowmeter 231 and the first pressure gauge 221 at the water outlet can detect the flow rate and pressure at the water outlet of the three-way valve 220 in real time. Taking the opening (or relative opening) as the abscissa and the flow rate (or relative flow rate) as the ordinate, the Kv flow characteristic curves (characteristic curves of the flow rate changing with the opening) of the water inlet and the water outlet of the three-way valve 220 can be drawn.

[0035] In addition, in some other embodiments, the connection order of the first switching valve 212 and the first flowmeter 213 can be reversed, that is, the input pipeline 210 includes a first pressure reducing valve 211, a first flowmeter 213, and a first switching valve 212 connected in series in sequence. Such an arrangement can also achieve the effect of controlling the pressure and on / off of the input pipeline 210, which will not be elaborated here.

[0036] It can be understood that by setting the first pressure reducing valve 211 and the first switching valve 212, after the user closes the first switching valve 212 and then closes the corresponding water inlet, the disconnection of one of the water inlets of the three-way valve 220 can be achieved. After the user opens the first switching valve 212 and then adjusts the first pressure reducing valve 211, the pressure of the corresponding input pipeline 210 can be adjusted to the preset pressure, and under the feedback adjustment of the first pressure reducing valve 211, the pressure of the input pipeline 210 can be maintained stable, eliminating the influence of the pressure drop of the input pipeline 210, and providing an ideal test environment when the three-way valve 220 is used to simulate a single flow path or a double flow path. By setting the single-seat regulating valve 232, the user can either adjust the total outlet flow through the single-seat regulating valve 232 to simulate the working condition test, or manually adjust the single-seat regulating valve 232 to be fully open, which can make the outlet pressure of the three-way valve 220 approach the system back pressure, minimize the flow restriction of the output pipeline 230, avoid the interference of the outlet side pressure fluctuation or throttling effect on the actual flow characteristics of the valve to be tested, provide a stable outlet pressure environment for the three-way valve 220 to be tested, and ensure that the flow distribution at the inlet of the three-way valve 220 changes only according to the opening degree change of the three-way valve 220. The cooperation of the first pressure reducing valve 211 and the single-seat regulating valve 232 can provide a stable and ideal pressure environment at the water inlet and outlet of the three-way valve 220 to be tested, reduce the influence of the characteristics of each pipeline except the three-way valve 220, improve the correlation between the test data and the inherent characteristics of the valve, and effectively improve the accuracy of the detection result.

[0037] It should be added that considering that the output pipeline 230 is relatively long and the pipeline length from the water outlet of the three-way valve 220 to the single-seat regulating valve 232 is relatively long, therefore, a second pressure gauge 235 can also be set between the second flowmeter 231 and the single-seat regulating valve 232, so as to accurately detect the inlet pressure of the single-seat regulating valve 232 and facilitate the user to judge whether the pressure of the output pipeline 230 is stable.

[0038] Referring to Figure 2 As shown, it can be understood that a shunt branch 240 is connected in parallel to the input pipeline 210. The input end of the shunt branch 240 is connected between the first pressure reducing valve 211 and the first switching valve 212, and the output end is connected between the first flowmeter 213 and the three-way valve 220. The diameter of the shunt branch 240 is smaller than that of the input pipeline 210, and generally, the diameter of the shunt branch 240 is less than half of the diameter of the input pipeline 210. The shunt branch 240 includes a second switching valve 241 and a third flowmeter 242 connected in series. Exemplarily, in this embodiment, the diameter of the input pipeline 210 can be DN80, and the diameter of the shunt branch 240 can be DN25.

[0039] When the flow rate is small, the measurement error of the first flowmeter 213 on the input pipeline 210 is very large, seriously affecting the test results. By setting the shunt branch 240, on the one hand, the shunt branch 240 is connected in parallel with the first flowmeter 213, and then a third flowmeter 242 corresponding to the pipe diameter of the shunt branch 240 is configured, so that the flow rate of the shunt branch 240 with a small flow rate can be accurately detected, facilitating the subsequent small-flow tests; on the other hand, when the user opens the first switching valve 212 and closes the second switching valve 241, the medium at the outlet can enter the water inlet of the three-way valve 220 through the input pipeline 210 with a larger pipe diameter; when the user opens the second switching valve 241 and closes the first switching valve 212, the medium at the outlet can enter the water inlet of the three-way valve 220 through the shunt branch 240 with a smaller pipe diameter. This enables the user to switch the diameter of the pipeline connected to the water inlet of the three-way valve 220, thereby controlling the flow rate entering the three-way valve 220, simulating the large-flow or small-flow conditions of the three-way valve 220, and improving the comprehensiveness of the test results. In addition, when the connection order of the first switching valve 212 and the first flowmeter 213 is reversed, the input end of the shunt branch 240 is connected between the first pressure reducing valve 211 and the first flowmeter 213, and the output end is connected between the first switching valve 212 and the three-way valve 220, and the same effect of switching the flow rate can be achieved.

[0040] Further, there are two second switching valves 241, and the two second switching valves 241 are respectively connected to both ends of the third flowmeter 242.

[0041] By setting two second switching valves 241, when the two second switching valves 241 are closed simultaneously, the third flowmeter 242 can be isolated from the entire test device. This not only facilitates the user to repair, maintain or replace the third flowmeter 242, reducing the later maintenance cost of the shunt branch 240, but also can isolate the third flowmeter 242 in advance during large-flow tests, protecting the third flowmeter 242 and extending the service life of the shunt branch 240.

[0042] Still further, a third switching valve 214 is connected between the input pipeline 210 and the outlet.

[0043] When simulating the single - path flow characteristics of the three - way valve 220, it is necessary to switch the gear of the three - way valve 220 and close the water inlet that does not need to be detected. At this time, the input pipeline 210 connected to the closed water inlet should also be disconnected correspondingly. By setting the third switch valve 214, on the one hand, the user can directly close the third switch valve 214 to disconnect the connection between the corresponding input pipeline 210 and the outlet, without closing the first switch valve 212 and the second switch valve 241 one by one, effectively improving the convenience of using the test device; on the other hand, when the third switch valve 214 and the first switch valve 212 are disconnected simultaneously, the first pressure reducing valve 211 can be isolated from the input pipeline 210, which is convenient for the user to repair, maintain or replace the first pressure reducing valve 211, reducing the later maintenance cost of the input pipeline 210.

[0044] Refer to Figure 1 and Figure 2 As shown, it can be understood that the three - way valve flow characteristic test device further includes a controller. The controller can be a fixed controller integrated in the test device or a remote controller independent of the test device. The controller is provided with a drawing unit and a display unit. Pressure transmitters 222 are installed at both the inlet end and the outlet end of the three - way valve 220. The first flowmeter 213, the second flowmeter 231 and the pressure transmitters 222 are all communicatively connected to the controller. The controller can receive the flow data signals and pressure data signals sent by the first flowmeter 213, the second flowmeter 231 and the pressure transmitters 222, and draw a kv curve through the drawing unit for the flow data signals and pressure data signals. The display unit can display the kv curve on an observable display screen, which is convenient for the user to view.

[0045] By setting the controller and the pressure transmitters 222, the pressure transmitters 222 can convert the pipeline pressures at the water inlet and outlet of the three - way valve 220 into electrical signals and transmit them to the controller, which is convenient for reading and recording, and has high precision. Combining with the flow signals generated by the flowmeters, without the user manually observing the values of the pressure gauges and flowmeters and then manually drawing the kv curve, or manually inputting multiple values into the controller to generate a fitting curve, the kv curve can be automatically drawn, further improving the accuracy and precision of the detection results. In addition, the pressure transmitters 222 and the first pressure gauge 221 can be referred to each other to calibrate the pressure values and ensure the detection accuracy.

[0046] Further, the output end of the single - seat regulating valve 232 is connected to the water pump system 100 through a return pipeline 233. In other words, the output pipeline 230 includes the return pipeline 233. The input end of the return pipeline 233 is connected to the output end of the single - seat regulating valve 232, and the output end is connected to the input end of the water pump system 100. A fourth switch valve 234 is provided on the return pipeline 233.

[0047] By setting up a reflux pipeline 233, the reflux pipeline 233 forms a loop between the test system 200 and the water pump system 100, thereby guiding the tested medium to flow back to the water pump system 100 to prepare for the next test, avoiding waste of resources caused by direct discharge of the medium, and effectively improving the environmental friendliness of the test device.

[0048] Referring to Figure 1 and Figure 3 as shown, it can be understood that the water pump system 100 includes a pump house 110, a fifth switching valve 120, a pressure stabilizing tank 130, and a second pressure reducing valve 140 that are connected in sequence from start to end, and two outlets are provided on the pressure stabilizing tank 130.

[0049] The pump house 110, the pressure stabilizing tank 130, and the second pressure reducing valve 140 that are connected in sequence from start to end can form an overflow loop. The user turns on the water pump in the pump house 110 to inject water and pressurize the pressure stabilizing tank 130. At the same time, the second pressure reducing valve 140 is adjusted until the pressure of the pressure stabilizing tank 130 reaches the set value, and the pressure setting of the pressure stabilizing tank 130 can be completed. The second pressure reducing valve 140 can automatically adjust the output pressure of the pressure stabilizing tank 130 to ensure that the water pump system 100 provides a stable pressure, thereby keeping the input pipeline 210 under stable pressure and improving the working stability of the test device.

[0050] It should be added that a filter 150 can also be provided between the pressure stabilizing tank 130 and the fifth switching valve 120 to filter the medium output by the pump house 110 and avoid blockage of the subsequent pressure stabilizing tank 130 or the test system 200. In addition, a sixth switching valve 160 is connected to both ends of the second pressure reducing valve 140, so that it is convenient for the user to isolate the second pressure reducing valve 140, which is convenient for the user to repair, maintain, or replace the second pressure reducing valve 140, and reduces the later maintenance cost of the pressurization system 300.

[0051] Referring to Figure 1 and Figure 4 as shown, it can be understood that the pressure stabilizing tank 130 is also connected to a pressurization system 300, and the pressurization system 300 includes a gas source 310 and a buffer tank 320 connected in series in sequence.

[0052] By setting up the gas source 310 and the buffer tank 320, when the pressure provided by the water pump system 100 cannot reach the preset pressure value, the user can turn on the gas source 310. The high-pressure gas in the gas source 310 enters the pressure stabilizing tank 130 after being buffered by the buffer tank 320, which can pressurize the inside of the pressure stabilizing tank 130 to make the output pressure of the pressure stabilizing tank 130 reach the preset pressure value, and improve the practicability of the test system 200.

[0053] Furthermore, a third pressure reducing valve 330 is connected between the gas source 310 and the buffer tank 320.

[0054] By setting the third pressure reducing valve 330, the user can precisely adjust the output pressure of the pressurization system 300, improve the controllability of the test system 200, expand the applicable range of the test system 200, and further improve the practicability of the test system 200.

[0055] It should be added that switch valves are also connected to both ends of the third pressure reducing valve 330, so as to facilitate the user to isolate the third pressure reducing valve 330, facilitate the user to repair, maintain or replace the third pressure reducing valve 330, and reduce the later maintenance cost of the pressurization system 300.

[0056] Refer to Figure 5 As shown, a method for testing the flow characteristics of a three-way valve 220 according to an embodiment of the present application includes the following steps:

[0057] S100, open the single-seat regulating valve 232 and the first switching valve 212 to make both the input pipeline 210 and the output pipeline 230 conduct;

[0058] S200, control one of the water inlets of the three-way valve 220; and / or, open the other water inlet;

[0059] S300, close the first switching valve 212 connected to the water inlet of the three-way valve 220 that is not opened, control the single-seat regulating valve 232 to be fully open, after adjusting the opening of the three-way valve 220 to 50%, adjust the first pressure reducing valve 211 corresponding to the opened water inlet of the three-way valve 220, so that the input pipeline 210 corresponding to the opened water inlet of the three-way valve 220 reaches a preset pressure value;

[0060] S400, adjust the opening of the three-way valve 220 from 50% to 0%, and then adjust from 0% to 100% at a preset adjustment amplitude, record the pressure values and flow values of the opened water inlet and water outlet of the three-way valve 220 after each adjustment and draw a Kv curve.

[0061] Specifically, the three-way valve 220 has a water inlet B, a water inlet C and a water outlet A, and the three-way valve 220 has three flow modes, namely:

[0062] ① 0 position (fully closed position): a single-flow path mode in which the water inlet C is closed and the water inlet B is communicated with the water outlet A;

[0063] ② 100% position: a single-flow path mode in which the water inlet B is closed and the water inlet C is communicated with the water outlet A;

[0064] ③ 50% position: a double-flow path mode in which both the water inlet B and the water inlet C are communicated with the water outlet A.

[0065] The specific operations of the above test steps for three-way valves with different flow modes are as follows:

[0066] Dual-path flow characteristic test of the three-way valve 220: Adjust the opening of the three-way valve 220 to 50%, and then adjust the first pressure reducing valves 211 corresponding to the water inlets B and C to keep the pressures at the water inlets B and C basically the same. At the same time, fully open the manual single-seat regulating valve 232 connected to the water outlet A. Then adjust the opening of the three-way valve 220 directly from 50% to 0%, and then adjust it from 0% to 100% with a preset adjustment range. Optionally, the preset adjustment range can be 5%, 10%, etc., which will not be elaborated here. During the adjustment process, the first pressure reducing valves 211 and the single-seat regulating valves 232 corresponding to the water inlets B and C are no longer adjusted. Record the pressures and flows at the water inlets B, C and the water outlet A after each adjustment, and the dual-path flow Kv curve of the three-way valve 220 can be obtained.

[0067] Single-path flow characteristic test of the three-way valve 220:

[0068] Measure the path from the water inlet B to the water outlet A. First, close the first switching valve 212 corresponding to the water inlet C, manually adjust the single-seat regulating valve 232 to be fully open, adjust the opening of the three-way valve 220 to 50%, and then adjust the first pressure reducing valve 211 corresponding to the water inlet B to make the pressure at the water inlet B reach the preset pressure value. Then directly adjust the opening of the three-way valve 220 from 50% to 0%, and then adjust it from 0% to 100% with a preset adjustment range. During the adjustment process, the first pressure reducing valve 211 and the single-seat regulating valve 232 corresponding to the water inlet B are no longer adjusted. Record the pressures and flows at the water inlet B and the water outlet A after each adjustment, and the single-path flow Kv curve of the three-way valve 220 for the path from the water inlet B to the water outlet A can be obtained.

[0069] It should be noted that in this embodiment, the input pipeline 210 connected to the water inlet C is provided with a shunt branch 240 and a third switching valve 214. Then the step of closing the first switching valve 212 can be replaced by closing the third switching valve 214, which can also achieve the effect of disconnecting the input pipeline 210 connected to the water inlet C.

[0070] Measure the path from the water inlet C to the water outlet A. First, close the first switching valve 212 corresponding to the water inlet B, manually adjust the single-seat regulating valve 232 to be fully open, adjust the opening of the three-way valve 220 to 50%, and then adjust the first pressure reducing valve 211 corresponding to the water inlet C to make the pressure at the water inlet C reach the preset pressure value. Then directly adjust the opening of the three-way valve 220 from 50% to 0%, and then adjust it from 0% to 100% with a preset adjustment range. During the adjustment process, the first pressure reducing valve 211 and the single-seat regulating valve 232 corresponding to the water inlet C are no longer adjusted. Record the pressures and flows at the water inlet C and the water outlet A after each adjustment, and the single-path flow Kv curve of the three-way valve 220 for the path from the water inlet C to the water outlet A can be obtained.

[0071] It should be noted that in this embodiment, the input pipeline 210 connected to the water inlet B is provided with a shunt branch 240 and a third switching valve 214. Therefore, the step of closing the first switching valve 212 can be replaced by closing the third switching valve 214, which can also achieve the effect of disconnecting the input pipeline 210 connected to the water inlet B.

[0072] It can be understood that fully opening the single-seat regulating valve 232 can minimize its flow restriction, avoid pressure fluctuations on the outlet side or throttling effects from interfering with the actual flow characteristics of the valve under test. Moreover, when the single-seat regulating valve 232 is in the fully open state, the system flow reaches the maximum value, providing a reference value for subsequent relative flow calculation and facilitating normalization processing. By adjusting the first pressure reducing valve 211, the pressure at the water inlet of the three-way valve 220 under test is stabilized at a preset value to avoid distortion of the flow characteristic test caused by upstream pressure fluctuations. When performing the dual-flow path flow characteristic test, the pressures at the water inlet B and the water inlet C are controlled to be basically the same to avoid obvious pressure differences between the water inlet B and the water inlet C, which may cause squeezing of the flows at the two inlets and affect the results. Before the test starts, the opening of the three-way valve 220 is adjusted to 50%. On the one hand, it can quickly detect whether there is jamming or non-linear displacement in the movement of the valve core, discover structural defects of the valve core in advance, and ensure the mechanical reliability of the subsequent full-stroke test. On the other hand, it can keep the water inlet environments of the water inlet B and the water inlet C consistent, facilitating the user to adjust the pressure of the input pipeline 210.

[0073] Using the above method for flow characteristic testing can measure the flow characteristics of the three-way valve 220 when the dual-flow paths introduce media simultaneously, and can also measure the flow characteristics of the three-way valve 220 in a single-flow path respectively. Moreover, it can eliminate the interference of environmental factors such as pipeline pressure drop and pressure fluctuations, ensuring the authenticity and accuracy of the test results.

[0074] It should be noted that in some other embodiments, in the step of adjusting the opening of the three-way valve 220, the opening of the three-way valve 220 can also be directly adjusted from 50% to 100%, and then adjusted from 100% to 0% at a preset adjustment amplitude, which can also plot the Kv curve of the three-way valve.

[0075] In addition, it should be supplemented that before performing the flow characteristic test of the three-way valve 220, the following preparation steps are also required:

[0076] S110, pressure setting of the pressure stabilizing tank 130: First, close the two third switching valves 214 and the switching valve in the pressurizing system 300, and then open the fifth switching valve 120 at both ends of the second pressure reducing valve 140; turn on the water pump in the pump house 110 to inject water and pressurize the pressure stabilizing tank 130; adjust the second pressure reducing valve 140 during this period until the pressure of the pressure stabilizing tank 130 reaches the set value, realizing the pressure setting of the pressure stabilizing tank 130.

[0077] S120, if the second pressure reducing valve 140 cannot reach the set value, open the switch valves at both ends of the third pressure reducing valve 330, and then adjust the third pressure reducing valve 330 to increase the pressure of the surge tank 130 through the gas source 310 to reach the required pressure for the test.

[0078] S130, determining whether the test system 200 needs to perform a high flow condition simulation;

[0079] S131, if yes, adjust the single-seat regulating valve 232 to the open state; then adjust the three-way valve 220 so that the three-way valve 220 is in the 0 position (fully closed position); close the second switch valve 241 on the diversion branch 240, and then open the first switch valve 212 and the third switch valve 214 on the input pipeline 210 to enable water to flow through the three-way valve 220 pipeline.

[0080] S132, otherwise, it is necessary to switch the flow path, open the second switch valve 241 on the shunt branch 240, and close the first switch valve 212 on the input pipeline 210, thus completing the small flow condition test circuit switching.

[0081] Furthermore, in the above-mentioned preliminary preparations, the closing of the on-off valves in each step can be performed sequentially along the flow direction of the medium, and the opening can be performed sequentially against the flow direction of the medium. For example, in step S131, the second on-off valve 241 on the diversion branch 240 is closed, and then the first on-off valve 212 and the third on-off valve 214 on the input pipeline 210 are opened. The specific steps are as follows: the second on-off valve 241 at the rear end and the second on-off valve 241 at the front end of the third flowmeter 242 along the flow direction of the medium are closed in sequence, and then the first on-off valve 212 at the front end and the third on-off valve 214 at the rear end of the first flowmeter 213 along the flow direction of the medium are opened in sequence. In addition, if the output pipeline 230 includes a return pipeline 233 connected to the water pump system 100, the fourth on-off valve 234 needs to be opened before opening the first on-off valve 212.

[0082] By opening and closing the switch valves in each step in the above order, it is possible to avoid silting and seeding between adjacent switch valves, while preventing the medium from continuously impacting the switch valves, thereby extending the service life of the test device.

[0083] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A flow characteristic test device for a three-way valve, characterized in that, Comprising: A water pump system (100) having two outlets; A test system (200) including two input pipelines (210), a detection position, and an output pipeline (230). The detection position is used for installing a three-way valve (220) to be tested. The input pipeline (210) includes a first pressure reducing valve (211), a first switching valve (212), and a first flowmeter (213) connected in series in sequence. The input ends of the two input pipelines (210) are respectively connected in communication with the outlets correspondingly, and the output ends are respectively connected in communication with the two water inlets of the three-way valve (220). The water outlet of the three-way valve (220) is connected in communication with the output pipeline (230). The output pipeline (230) includes a second flowmeter (231) and a single-seat regulating valve (232) connected in series in sequence. First pressure gauges (221) are installed at both the water inlet and the water outlet of the three-way valve (220).

2. The three-way valve flow characteristic testing device according to claim 1, characterized in that A shunt branch (240) is connected in parallel with the input pipeline (210). The input end of the shunt branch (240) is connected in communication between the first pressure reducing valve (211) and the first switching valve (212), and the output end is connected in communication between the first flowmeter (213) and the three-way valve (220). The diameter of the shunt branch (240) is smaller than that of the input pipeline (210). The shunt branch (240) includes a second switching valve (241) and a third flowmeter (242) connected in series.

3. The three-way valve flow characteristic testing device according to claim 2, wherein, There are two second switching valves (241), and the two second switching valves (241) are respectively connected to both ends of the third flowmeter (242).

4. The three-way valve flow characteristic testing device according to claim 1, characterized in that, The three-way valve (220) flow characteristic test device further includes a controller. Pressure transmitters (222) are installed at both the water inlet and the water outlet of the three-way valve (220). The first flowmeter (213), the second flowmeter (231), and the pressure transmitters (222) are all in communication connection with the controller.

5. The three-way valve flow characteristic testing device according to claim 1, wherein A third switching valve (214) is connected between the input pipeline (210) and the outlet.

6. The three-way valve flow characteristic testing device according to claim 1, characterized in that, The output end of the single-seat regulating valve (232) is connected in communication with the water pump system (100) through a return pipeline (233), and a fourth switching valve (234) is provided on the return pipeline (233).

7. The flow characteristic testing device for a three-way valve according to claim 1, characterized in that, The water pump system (100) includes a pump house (110), a fifth switching valve (120), a pressure stabilizing tank (130), and a second pressure reducing valve (140) connected in sequence end to end. The two outlets are provided on the pressure stabilizing tank (130).

8. The three-way valve flow characteristic testing device according to claim 7, characterized in that The pressure stabilizing tank (130) is further connected to a pressurizing system (300). The pressurizing system (300) includes a gas source (310) and a buffer tank (320) connected in series in sequence.

9. The three-way valve flow characteristic testing device according to claim 8, wherein, A third pressure reducing valve (330) is connected between the gas source (310) and the buffer tank (320).

10. A method for testing the flow characteristics of a three-way valve, which is implemented by the three-way valve flow characteristic testing device according to any one of claims 1-9, characterized in that, Including the following steps: Open the single-seat regulating valve (232) and the first switching valve (212) to make both the input pipeline (210) and the output pipeline (230) conductive; Control one of the water inlets of the three-way valve (220); And / or, open the other water inlet; Close the first switching valve (212) connected to the water inlet of the unopened three-way valve (220), fully open the single-seat regulating valve (232), after adjusting the opening of the three-way valve (220) to 50%, adjust the first pressure reducing valve (211) corresponding to the water inlet of the opened three-way valve (220), so that the input pipeline (210) corresponding to the water inlet of the opened three-way valve (220) reaches a preset pressure value; Adjust the opening of the three-way valve (220) from 50% to 0%, and then adjust it from 0% to 100% with a preset adjustment range, record the pressure values and flow values of the opened water inlet and outlet of the three-way valve (220) after each adjustment and draw a Kv curve.

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