CN216869999U

CN216869999U - Balance valve test system

Info

Publication number: CN216869999U
Application number: CN202123436240.0U
Authority: CN
Inventors: 李峰; 高学斌; 张雷; 李兆远; 王硕; 吴家辉
Original assignee: Harbin Hakong Industry Co ltd
Current assignee: Harbin Hakong Industry Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-07-01
Anticipated expiration: 2031-12-30

Abstract

The utility model discloses a balance valve testing system, and belongs to the technical field of valve detection. The balance valve testing system comprises a first three-group valve mechanism, an oil tank mechanism and an air tank, wherein the oil tank mechanism comprises a balance valve, a second oil tank and a second oil pump, and the balance valve is respectively connected with the first three-group valve mechanism and the air tank through pipelines; a third signal pipe valve is arranged on a pipeline between the first three groups of valve mechanisms and the balance valve, and the other end of the third signal pipe valve is connected with the oil tank mechanism; the gas tank passes through the pipe connection with the second oil tank, is equipped with first admission valve and second discharge valve on the pipeline between gas tank and the second oil tank. The utility model can completely simulate the hydrogen side sealing oil circulation system of the double-flow-ring steam turbine generator unit, simulate the conditions of various working conditions of starting, running, stopping and the like of the generator, and has reliable test and high precision.

Description

Balance valve test system

Technical Field

The utility model relates to a balance valve testing system, and belongs to the technical field of valve detection.

Background

A balanced valve is a regulating valve that does not require any additional energy source. The valve is arranged at the hydrogen side sealing oil position in a generator set sealing oil system, and one balance valve is arranged on an oil way flowing to the excitation end; the other balancing valve is arranged on the oil path flowing to the steam end. The balance of the oil pressure at the hydrogen side and the oil pressure at the empty side is ensured in a hydrogen-cooled generator sealing oil system. Therefore, the hydrogen and air side oil grooves can be reduced from moving, hydrogen leakage or air mixing into the mechanism can be prevented, and the safety and normal operation of the generator set are guaranteed. Therefore, the balance valve is a very important and indispensable key device in the generator sealing oil system.

Because the valve has important influence on the performance of a sealing oil system and even a generator set, and needs to have high reliability, an effective test means is needed to test the performance of the valve.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a balance valve test system which can truly simulate various working conditions of a double-flow-loop generator turbine motor sealing bush during working so as to test whether the performance of a balance valve can meet requirements; the performance of the balance valve has great significance in actual operation, and for the performance measurement of the balance valve in the system, whether the balance valve can be effectively applied in an actual system or not and whether the applied efficiency meets the industrial standard or not are detected, so that the performance measurement of the balance valve has great significance for judging the actual application of the balance valve and subsequently adjusting the balance valve.

The balance valve testing system comprises a first three-group valve mechanism, an oil tank mechanism and an air tank, wherein the oil tank mechanism comprises a balance valve, a second oil tank and a second oil pump, and the balance valve is respectively connected with the first three-group valve mechanism and the air tank through pipelines; a third signal pipe valve is arranged on a pipeline between the first three groups of valve mechanisms and the balance valve, and the other end of the third signal pipe valve is connected with the oil tank mechanism; the gas tank passes through the pipe connection with the second oil tank, is equipped with first admission valve and second discharge valve on the pipeline between gas tank and the second oil tank.

In one embodiment of the present invention, the first three sets of valve mechanisms comprise a third three sets of valves, a fourth three sets of valves, a balance gauge and a second differential pressure transmitter; the balance meter is connected with the second differential pressure transmitter through a pipeline, and a third group of valves and a fourth group of valves are arranged on the pipeline between the balance meter and the second differential pressure transmitter.

In one embodiment of the utility model, the second oil tank is connected with the second oil pump through a pipeline, a second inlet valve and a fourth filter are arranged between the second oil tank and the second oil pump, the second oil pump is connected with a second check valve, the second check valve is connected with the balance valve through a pipeline, and a second thermometer, a third pressure gauge, a second platinum thermal resistor, a third pressure transmitter and a first inlet valve are arranged between the second check valve and the balance valve.

In one embodiment of the present invention, a second bypass valve is further connected to the second oil pump; an outlet valve, a third filter, a fourth pressure transmitter, a fourth pressure gauge, a second flow transmitter and a second flow regulating valve are arranged between the balance valve and the second oil tank.

In one embodiment of the utility model, a first signal pipe valve and a fourth signal pipe valve are arranged on a pipeline between the balance valve and the gas tank; and a fifth pressure gauge, a fifth pressure transmitter, a first exhaust valve and a second air inlet valve are arranged on the air tank, and the second air inlet valve is connected with an air compressor.

In one embodiment of the present invention, a first liquid level meter is provided on the second oil tank; and a second liquid level meter is arranged on the gas tank.

In one embodiment of the present invention, the system further comprises a differential pressure valve mechanism and a second three sets of valve mechanisms, wherein the second three sets of valve mechanisms are respectively communicated with the balance valve and the gas tank, and the differential pressure valve mechanism is respectively communicated with the balance valve and the gas tank.

In an embodiment of the utility model, the second three groups of valve mechanisms comprise a differential pressure gauge and a first differential pressure transmitter, the differential pressure gauge and the first differential pressure transmitter are connected through a pipeline, a first three-valve group and a second three-valve group are arranged on the pipeline between the differential pressure gauge and the first differential pressure transmitter, one end of the second three groups of valve mechanisms is connected into the gas tank through a first signal pipe valve, and the other end of the second three groups of valve mechanisms is connected into the balance valve through a fourth signal pipe valve.

In one embodiment of the present invention, the differential pressure valve mechanism includes a differential pressure valve and a first oil tank, the differential pressure valve is communicated with the first oil tank through three pipelines, and a first pipeline of the three pipelines is directly communicated with the differential pressure valve and the first oil tank; a second valve, a second signal pipe valve, a second pressure transmitter, a second pressure gauge, a second filter, a first flow transmitter and a first flow regulating valve are arranged on the second pipeline of the three pipelines, and the second signal pipe valve is communicated with the balance valve; be equipped with first valve, first filter, first pressure transmitter, first platinum resistance, first manometer, first check valve and first oil pump on the third pipeline of three pipelines, still be equipped with a branch pipe on the third pipeline, be equipped with first bypass valve on the branch pipe, the one end of first bypass valve inserts on the third pipeline, and the other end communicates with first oil tank.

In one embodiment of the utility model, the air tank is filled with lubricating oil, and the pressure difference valve is connected with the lubricating oil at the lower part of the air tank.

Advantageous effects

1. The utility model completely simulates the hydrogen side sealing oil circulation system of the double-flow ring steam turbine generator unit, simulates the conditions of various working conditions of starting, running, stopping and the like of the generator, and has comprehensive detection range; compared with the prior system, the system increases digital output to a microcomputer, and is beneficial to quickly analyzing the cause of the problem of the valve.

2. The balance valve detected by the utility model is in accordance with the air-hydrogen side pressure difference value +/-490 Pa (+/-50 mmH20) in practical application in a power plant; prevent the air-hydrogen side oil channeling of the sealing bush, and provide guarantee for the reliable operation of the unit.

3. In order to ensure the accuracy of the balance valve test, the balance valve and the differential pressure valve are subjected to linkage test, so that the system is matched with a system of a generator, the test is reliable, and the accuracy is high.

Drawings

FIG. 1 is a diagram of a stand-alone test system of a balance valve according to embodiment 1;

FIG. 2 is a diagram of a system for testing the linkage of a balance valve and a differential pressure valve in the embodiment 2;

wherein: AP 003-air compressor, AA 300-second inlet valve, LI 502-second level gauge, AA 501-first exhaust valve, BB 003-air tank, PI 505-fifth pressure gauge, PT 105-fifth pressure transmitter, AA 301-first signal pipe valve, AP 001-first oil pump, AA 201-first check valve, AA 001-first bypass valve, BB 001-first oil tank, TI 501-first thermometer, PI 501-first pressure gauge, CT 101-first platinum thermistor, PT 101-first pressure transmitter, AT 001-first filter, AA 002-first valve, AA 003-second valve, AA 101-differential pressure valve, AA 303-second signal pipe valve, PT 102-second pressure transmitter, PI 502-second pressure gauge, AT 002-second filter, FT 101-first flow transmitter, AA 141-first flow regulating valve, PDI 506-pressure difference meter, AA 306-first third valve bank, AA 307-second third valve bank, PDT 106-first pressure difference transmitter, PDI 507-balance meter, AA 308-third valve bank, AA 309-fourth third valve bank, PDT 107-second pressure difference transmitter, AA 305-fourth signal pipe valve, AA 304-third signal pipe valve, AA 007-outlet valve, AT 003-third filter, PT 104-fourth pressure transmitter, AA 121-balance valve, PI 504-fourth pressure gauge, FT 102-second flow transmitter, AA 006-first inlet valve, AA 142-second flow regulating valve, CT 102-second platinum thermal resistor, PT 103-third pressure transmitter, PI 503-third pressure meter, TI 502-second thermometer, AA 005-second bypass valve, AA 202-second check valve, AP 002-second oil pump, AC 001-fourth filter, AA 004-second inlet valve, BB 002-second oil tank, AA 302-first inlet valve, AA 502-second exhaust valve and LI 501-first liquid level meter.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to directions in the drawings. The terms "inner" and "outer" are used to refer to directions toward and away from, respectively, the geometric center of a particular component.

Example 1

A balance valve testing system comprises a first three-group valve mechanism, an oil tank mechanism and an air tank BB003, wherein the oil tank mechanism comprises a balance valve AA121, and the balance valve AA121 is connected with the first three-group valve mechanism and the air tank BB003 respectively;

the first three-group valve mechanism comprises a third three-group valve AA308, a fourth three-group valve AA309, a balance table PDI507 and a second differential pressure transmitter PDT107, wherein the balance table PDI507 is connected with the second differential pressure transmitter PDT107 through a pipeline, and the pipeline between the balance table PDI507 and the second differential pressure transmitter PDT107 is provided with the third three-group valve AA308 and the fourth three-group valve AA 309; the first three groups of valve mechanisms are connected with the balance valve AA121 through a pipeline, a third signal pipe valve AA304 is arranged on the pipeline between the first three groups of valve mechanisms and the balance valve AA121, and the other end of the third signal pipe valve AA304 is connected with the oil tank mechanism;

the oil tank mechanism further comprises a second oil tank BB002 and a second oil pump AP002, the second oil tank BB002 is connected with the second oil pump AP002 through a pipeline, a second inlet valve AA004 and a fourth filter AC001 are arranged between the second oil tank BB002 and the second oil pump AP002, the second oil pump AP002 is connected with a second check valve AA202, the second check valve AA202 is connected with a balance valve AA121 through a pipeline, and a second thermometer TI502, a third pressure gauge PI503, a second platinum thermal resistor CT102, a third pressure transmitter PT103 and a first inlet valve AA006 are arranged between the second check valve AA202 and the balance valve AA 121; the second oil pump AP002 is further connected with a second bypass valve AA005, and the second bypass valve AA005 is used for adjusting pressure; an outlet valve AA007, a third filter AT003, a fourth pressure transmitter PT104, a fourth pressure gauge PI504, a second flow transmitter FT102 and a second flow regulating valve AA142 are arranged between the balance valve AA121 and the second oil tank BB 002.

Further, the air tank BB003 is connected to the second oil tank BB002 through a pipe, and a first intake valve AA302 and a second exhaust valve AA502 are disposed on the pipe between the air tank BB003 and the second oil tank BB 002.

Further, the equalization valve AA121 is connected to the air tank BB003 through a pipe, and a first signal pipe valve AA301 and a fourth signal pipe valve AA305 are provided on a pipe between the equalization valve AA121 and the air tank BB 003.

Further, a first liquid level meter LI501 is arranged on the second oil tank BB 002; and a second liquid level meter LI502 is arranged on the gas tank BB 003.

Further, a fifth pressure gauge PI505, a fifth pressure transmitter PT105, a first exhaust valve AA501 and a second intake valve AA300 are further arranged on the air tank BB003, and the second intake valve AA300 is connected with an air compressor AP 003.

Example 2

As shown in fig. 2, the present embodiment differs from embodiment 1 in that a differential pressure valve mechanism that communicates with the balance valve AA121 and the gas tank BB003, respectively, and a second three-group valve mechanism that communicates with the balance valve AA121 and the gas tank BB003, respectively, are further included;

the second three groups of valve mechanisms comprise a pressure difference meter PDI506 and a first pressure difference transmitter PDT106, the pressure difference meter PDI506 is connected with the first pressure difference transmitter PDT106 through a pipeline, a first three-valve group AA306 and a second three-valve group AA307 are arranged on the pipeline between the pressure difference meter PDI506 and the first pressure difference transmitter PDT106, one end of the second three groups of valve mechanisms is connected into a gas tank BB003 through a first signal pipe valve AA301, and the other end of the second three groups of valve mechanisms is connected into a balance valve AA121 through a fourth signal pipe valve AA 305.

The differential pressure valve mechanism comprises a differential pressure valve AA101 and a first oil tank BB001, the differential pressure valve AA101 is communicated with the first oil tank BB001 through three pipelines, and a first pipeline of the three pipelines is directly communicated with the differential pressure valve AA101 and the first oil tank BB 001; a second valve AA003, a second signal pipe valve AA303, a second pressure transmitter PT102, a second pressure gauge PI502, a second filter AT002, a first flow transmitter FT101 and a first flow regulating valve AA141 are arranged on the second of the three pipelines, and the second signal pipe valve AA303 is communicated with a balance valve AA 121; a third pipeline of the three pipelines is provided with a first valve AA002, a first filter AT001, a first pressure transmitter PT101, a first platinum thermal resistor CT101, a first pressure gauge PI501, a first check valve AA201 and a first oil pump AP001, the third pipeline is further provided with a branch pipe, the branch pipe is provided with a first bypass valve AA001, one end of the first bypass valve AA001 is connected to the third pipeline, and the other end of the first bypass valve AA001 is communicated with a first oil tank BB 001.

Furthermore, the air tank BB003 is filled with lubricating oil, and the pressure difference valve AA101 is connected with the lubricating oil at the lower part of the air tank BB003 through an air pressure signal pipe and a first signal pipe valve AA 301.

Furthermore, the control switch instruction and the sampling signal pressure, pressure difference and flow of each instrument are input into the microcomputer by the PLC.

Further, the balance valve AA121 includes two specifications of diameters, wherein the balance valve AA121 of one specification selects a pipe diameter of DN25, and the balance valve AA121 of the other specification selects a pipe diameter of DN 40.

The use process of the utility model is as follows:

1. preparation of the test

All instruments must be within the validity period of the test. The test station instrument power supply is turned on, and whether the display of the flow transmitters FT101, FT102, pressure transmitters PT101, PT102, PT103, PT104, PT105 and differential pressure transmitters PDT106, PDT107 is correct or not is checked (see detailed figure 2), and the display should be displayed initially as follows: PT105 was 0.005MPa, and the others were 0. And checking whether the opening and closing of each valve of the test device are normal. It is checked whether the oil levels of the oil tank BB002 and the air tank BB003 are at the intermediate positions indicated by the level gauges LI501 and LI 502.

The appearance and the cleanliness of the balance valve to be tested are initially checked, the accuracy of the installation of the overall dimension and each part is checked by referring to a drawing, the outer surface is not collided, the sealing surface is not scratched, the cleanness of internal parts is ensured before the valve test, and the internal parts are prevented from being damaged or impurities are prevented from entering the test device.

2. Test items

2.1 Balanced valve stand-alone test.

Presetting of each valve referring to fig. 1, a second bypass valve AA005 of a second oil pump AP002 is opened (closing can increase the outlet pressure of the oil pump, otherwise, decreasing), a first inlet valve AA006, an outlet valve AA007, a third signal pipe valve AA304 and a fourth signal pipe valve AA305 of a balance valve AA121 are opened, a second inlet valve AA004 is opened, a first exhaust valve AA501 on an air tank BB003 and a first intake valve AA302 of a second oil tank BB002 are closed, and a second exhaust valve AA502 is opened; the second flow control valve AA142 is in the neutral position (off flow decreases and vice versa flow increases); the trim bolt on the trim valve AA121 is in the neutral position; and opening the isolation valves of each pressure gauge, the third valve group AA308 and the fourth valve group AA 309.

2.1.1 static test (simulation generator static working condition)

The static test of the balance valve is to check the regulation performance of the balance valve on the outlet pressure by changing the inlet pressure of the balance valve (a third pressure transmitter PT 103/a third pressure gauge PI503) under the condition of limiting the maximum flow of the balance valve to be 19L/min at a pipe diameter DN25 and 83L/min at a pipe diameter DN 40.

Starting the second oil pump AP002, adjusting the second bypass valve AA005 to ensure that the outlet pressure of the second oil pump AP002, namely the numerical value of a third pressure gauge PI503 is 0.15MPa when the pipe diameter DN25 is larger than the pipe diameter DN40, and is 0.2MPa when the pipe diameter DN40 is smaller than the pipe diameter PI 503; starting an air compressor AP003 to inflate an air tank BB003 to a pipe diameter DN25, wherein the pipe diameter DN25 is 84KPa, and the pipe diameter DN40 is 100 KPa; adjusting a second flow regulating valve AA142 to enable a second flow transmitter FT102 to display that the flow is 19L/min when the pipe diameter is DN25 and 83L/min when the pipe diameter is DN 40; closing middle valves of a third valve group AA308 and a fourth valve group AA309, observing a pressure difference value of the balance valve, if the pressure difference value exceeds +/-490 Pa (+/-50 mmH20), opening a protective cover at the bottom of the balance valve, and adjusting a fine tuning bolt to enable the balance precision to meet the technical requirement (the fine tuning bolt cannot be adjusted in the formal test process); adjusting a second bypass valve AA005 to enable the outlet pressure of a third pressure gauge PI503 on the second oil pump AP002 to be 0.15Mpa when the pipe diameter DN 25; when the pipe diameter DN40 is respectively 0.2Mpa, 0.3Mpa, 0.4Mpa, 0.5Mpa and 0.62Mpa, recording the corresponding flow of the second flow transmitter FT102 (if the flow changes, the second flow regulating valve AA142 needs to be regulated to regulate the flow to 19/83L/min), the balance precision of the balance gauge PDI507, the empty side oil pressure of the fifth pressure gauge PI505, namely the pressure of the gas tank BB003, the hydrogen side oil pressure of the fourth pressure gauge PI504 and the value of the oil temperature of the hydrogen side of the second platinum thermal resistor CT 102; the qualified requirements are as follows: under the condition that the flow of the balance valve is kept to be maximum, the pressure balance value of the balance valve is required to be within a pressure difference range of +/-490 Pa in the whole pressure increasing and reducing process.

2.1.2 dynamic test (simulation of the operating mode of the generator during rotation)

The dynamic test of the balance valve is to verify the regulating performance of the balance valve on the outlet pressure within the designed flow range by changing the flow passing through the balance valve under the condition of limiting the balance valve to the rated oil-hydrogen pressure difference.

Starting the second oil pump AP002, adjusting the second bypass valve AA005 to ensure that the outlet pressure of the second oil pump AP002, namely the numerical value of a third pressure gauge PI503 is 0.15MPa when the pipe diameter DN25 is larger than the pipe diameter DN40, and is 0.2MPa when the pipe diameter DN40 is smaller than the pipe diameter PI 503; starting an air compressor AP003 to inflate an air tank BB003 to a pipe diameter DN25, wherein the pipe diameter DN25 is 84KPa, and the pipe diameter DN40 is 100 KPa; adjusting a second flow regulating valve AA142 to enable a second flow transmitter FT102 to display that the flow is 19L/min when the pipe diameter is DN25 and 83L/min when the pipe diameter is DN 40; closing middle valves of a third valve group AA308 and a fourth valve group AA309, observing a pressure difference value of the balance valve, if the pressure difference value exceeds +/-490 Pa (+/-50 mmH20), opening a protective cover at the bottom of the balance valve, and adjusting a fine tuning bolt to enable the balance precision to meet the technical requirement (the fine tuning bolt cannot be adjusted in the formal test process); adjusting a second flow regulating valve AA142 to enable the flow of the second flow transmitter FT102 to be 8L/min when the pipe diameter DN25 is larger than the preset value, respectively to be 16L/min, 19L/min, 25L/min, 30L/min, 50L/min and 83L/min when the pipe diameter DN40 is larger than the preset value, and recording the balance pressure difference of a balance table PDI507, the empty side oil pressure of a fifth pressure gauge PI505, the hydrogen side oil pressure of a fourth pressure gauge PI504 and the value of the oil temperature of the hydrogen side of a second platinum thermistor CT102 under the corresponding flow of the second flow transmitter FT 102; in the test process, along with the change of the flow of the balance valve, the outlet pressure of the second oil pump AP002, namely the value of a third pressure gauge PI503 is changed, when the flow is set, the second bypass valve AA005 can be finely adjusted properly, and the outlet pressure of the second oil pump AP002 is controlled to be 0.15MPa when the pipe diameter DN25 is kept, and is controlled to be 0.2MPa when the pipe diameter DN40 is kept; qualified requirements are as follows: under the condition that the oil hydrogen pressure difference is kept constant, the pressure balance value of the balance valve is required to be within a pressure difference range of +/-490 Pa in the whole flow rising and falling processes.

2.1.3 data bias and problem analysis

If the balance valve is in problem, static test may be qualified, and overproof may occur in dynamic test. If the equilibrium valve differential pressure value deviates or the turndown performance is too poor during the test, it is possible to: the piston in the balance valve is stuck by impurities in oil, and is necessary to be disassembled, cleaned and tested; the balance valve has poor quality, and if burrs are found during disassembly, the surface of a casting is not cleaned, and the phenomena of scratch, bruise and galling exist, the balance valve needs to be treated or repaired. Special attention is paid to: a valve with slow response to the differential pressure regulation performance of the balance valve may exceed the standard in the final delivery test.

2.2 balance valve and differential pressure valve linkage test (simulation generator normal operation condition)

The pressure difference valve AA101 is qualified after a single machine test, the presetting of each valve of the pressure difference valve AA101 test system is shown in figure 2, a first bypass valve AA001 of a first oil pump AP001 is opened, and each valve and each instrument of a first valve AA002, a second valve AA003, a first signal pipe valve AA301, a second signal pipe valve AA303, a first three-valve group AA306, a second three-valve group AA307 of the pressure difference valve AA101 are opened; opening a first air inlet valve AA302 of a second oil tank BB002 and a second air inlet valve AA306 of an air tank BB003, and closing a first exhaust valve AA501 and a second exhaust valve AA 502; the first flow control valve AA141 is in the neutral position; adjusting a pressure difference valve adjusting screw to the uppermost part; presetting of each valve of the balance valve AA121 test system is shown in figure 2, a second bypass valve AA005 of a second oil pump AP002 is opened (closing can increase the outlet pressure of the oil pump, otherwise, the first inlet valve AA006 and the outlet valve AA007 of the balance valve and the second inlet valve AA004 of the second oil pump AP002 are reduced, a third signal pipe valve AA304, a fourth signal pipe valve AA305, a third valve group AA308, a fourth valve group AA309 and each instrument isolation valve are opened, a second flow regulating valve AA142 is in a middle position (closing flow is reduced, otherwise, flow is increased), and a balance valve fine adjustment bolt is in the middle position.

The pressure difference valve AA101 is put into operation, the first oil pump AP001 is started, the first bypass valve AA001 of the first oil pump AP001 is gradually closed, and the first flow regulating valve AA141 is regulated to enable the flow of the first flow transmitter FT101 to be 50L/min; closing the middle valves of the first three valve group AA306 and the second three valve group AA307, rotating an adjusting bolt at the top of the pressure difference valve AA101 (the pressure is increased for the pressure difference of the main pipeline, and vice versa, the pressure difference is reduced), so that the pressure difference meter PDI506 displays that the pressure difference is 84Kpa when the pipe diameter DN25 is larger than the pressure difference, and is 100Kpa when the pipe diameter DN40 is larger than the pressure difference; the balance valve is put into, the second oil pump AP002 is started, the second bypass valve AA005 is adjusted, so that the outlet pressure of the second oil pump AP002, namely the numerical value of a third pressure gauge PI503 is 0.6MPa when the pipe diameter DN25 is larger, and is 1.1MPa when the pipe diameter DN40 is larger; adjusting a second flow regulating valve AA142 to ensure that the flow of a second flow transmitter FT102 is 8L/min when the pipe diameter is DN25 and 16L/min when the pipe diameter is DN 40; closing middle valves of the third valve group AA308 and the fourth valve group AA309, observing a balance pressure difference value of the balance valve, if the pressure difference value exceeds +/-490 Pa (+/-50 mmH20), opening a protective cover at the bottom of the balance valve, and adjusting a fine tuning bolt to enable the balance pressure difference to meet the technical requirement (the fine tuning bolt cannot be adjusted in the formal test process); starting an air compressor AP003 to charge a gas tank BB003, wherein the pressure of a fifth pressure gauge PI505 is respectively 0.05MPa, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa and 0.5MPa when the pipe diameter DN25 is larger; or the pressure of the fifth pressure gauge PI505 is 0.05MPa, 0.1MPa, 0.2MPa, 0.3MPa, 0.4MPa, 0.5MPa and 0.6MPa respectively when the pipe diameter DN40 is measured, and the pressure value of the fifth pressure gauge PI505, the oil pressure of the empty side of the second pressure gauge PI502, the pressure difference valve oil hydrogen pressure difference of the pressure difference gauge PDI506, the outlet pressure of the oil pump at the hydrogen side of the third pressure gauge PI503, the oil pressure at the hydrogen side of the fourth pressure gauge PI504, the oil temperature at the hydrogen side of the second platinum thermistor CT102, the flow of the balance valve FT102 of the second flow transmitter FT102 and the balance pressure difference of the balance gauge PDI507 are recorded; closing the air compressor AP003 and the second air inlet valve AA300, opening the first air outlet valve AA501 to exhaust, wherein the pressure of a fifth pressure gauge PI505 is 0.5MPa, 0.4MPa, 0.3MPa, 0.2MPa, 0.1MPa and 0.05MPa respectively when the pipe diameter DN 25; or the pressure of a fifth pressure gauge PI505 is 0.6MPa, 0.5MPa, 0.4MPa, 0.3MPa, 0.2MPa, 0.1MPa and 0.05MPa respectively when the pipe diameter DN40, and all numerical values are recorded; adjusting a second flow regulating valve AA142 to enable the flow of a second flow transmitter FT102 to be respectively 8L/min, 16L/min, 19L/min and 25L/min when the pipe diameter is DN 25; when the pipe diameter is DN40, the pipe diameters are respectively 30L/min, 50L/min and 83L/min, and the steps of charging air pressure and reducing air pressure are repeated for testing and recording; in the test process, along with the change of the flow of the balance valve, the third pressure gauge PI503 of the outlet pressure of the oil pump is changed, when the flow is set, the second bypass valve AA005 is adjusted finely appropriately, and the outlet pressure of the oil pump on the hydrogen side is controlled to be 0.6Mpa when the pipe diameter DN25 is formed; 1.1Mpa when the pipe diameter is DN 40; qualified requirements are as follows: under the condition that the oil hydrogen pressure difference is kept unchanged, the pressure balance value of the balance valve is required to be within a pressure difference range of +/-490 Pa in the processes of increasing and decreasing of the pressure in the machine at each balance valve flow checking point.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents may be substituted for elements thereof without departing from the scope of the utility model.

Claims

1. A balanced valve testing system characterized by: the oil tank mechanism comprises a balance valve, a second oil tank and a second oil pump, and the balance valve is respectively connected with the first three groups of valve mechanisms and the gas tank through pipelines; a third signal pipe valve is arranged on a pipeline between the first three groups of valve mechanisms and the balance valve, and the other end of the third signal pipe valve is connected with the oil tank mechanism; the gas tank passes through the pipe connection with the second oil tank, is equipped with first admission valve and second discharge valve on the pipeline between gas tank and the second oil tank.

2. The balanced valve testing system of claim 1, wherein: the first three groups of valve mechanisms comprise a third three groups of valves, a fourth three groups of valves, a balance meter and a second differential pressure transmitter; the balance meter is connected with the second differential pressure transmitter through a pipeline, and a third group of valves and a fourth group of valves are arranged on the pipeline between the balance meter and the second differential pressure transmitter.

3. The balanced valve testing system of claim 2, wherein: the second oil tank passes through the pipe connection with the second oil pump, is equipped with second import valve and fourth filter between second oil tank and the second oil pump, the second oil pump is connected with the second check valve, the second check valve passes through the pipe connection with the balanced valve, is equipped with second thermometer third manometer second platinum resistance, third pressure transmitter and first import valve between second check valve and the balanced valve.

4. A balanced valve testing system according to claim 3, characterized in that: the second oil pump is also connected with a second bypass valve; an outlet valve, a third filter, a fourth pressure transmitter, a fourth pressure gauge, a second flow transmitter and a second flow regulating valve are arranged between the balance valve and the second oil tank.

5. The balanced valve testing system of claim 4, wherein: a first signal pipe valve and a fourth signal pipe valve are arranged on a pipeline between the balance valve and the gas tank; and a fifth pressure gauge, a fifth pressure transmitter, a first exhaust valve and a second air inlet valve are arranged on the air tank, and the second air inlet valve is connected with an air compressor.

6. The balanced valve testing system of claim 5, wherein: a first liquid level meter is arranged on the second oil tank; and a second liquid level meter is arranged on the gas tank.

7. The balanced valve testing system of claim 6, wherein: the valve mechanism of the third group is communicated with the balance valve and the gas tank respectively, and the differential pressure valve mechanism is communicated with the balance valve and the gas tank respectively.

8. The balanced valve testing system of claim 7, wherein: the third group of valve mechanisms comprises a differential pressure gauge and a first differential pressure transmitter, the differential pressure gauge and the first differential pressure transmitter are connected through a pipeline, a first valve group and a second valve group are arranged on a pipeline between the differential pressure gauge and the first differential pressure transmitter, one end of the third group of valve mechanisms is connected into the gas tank through a first signal pipe valve, and the other end of the third group of valve mechanisms is connected into the balance valve through a fourth signal pipe valve.

9. The balanced valve testing system of claim 8, wherein: the differential pressure valve mechanism comprises a differential pressure valve and a first oil tank, the differential pressure valve is communicated with the first oil tank through three pipelines, and a first pipeline of the three pipelines is directly communicated with the differential pressure valve and the first oil tank; a second valve, a second signal pipe valve, a second pressure transmitter, a second pressure gauge, a second filter, a first flow transmitter and a first flow regulating valve are arranged on the second pipeline of the three pipelines, and the second signal pipe valve is communicated with the balance valve; be equipped with first valve, first filter, first pressure transmitter, first platinum resistance, first manometer, first check valve and first oil pump on the third pipeline of three pipelines, still be equipped with a branch pipe on the third pipeline, be equipped with first bypass valve on the branch pipe, the one end of first bypass valve inserts on the third pipeline, and the other end communicates with first oil tank.

10. The balanced valve testing system of claim 9, wherein: the gas tank is filled with lubricating oil, and the pressure difference valve is connected with the lubricating oil at the lower part of the gas tank.