CN105699068A - Safety valve performance testing and safety valve online calibrator calibrating device - Google Patents
Safety valve performance testing and safety valve online calibrator calibrating device Download PDFInfo
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- CN105699068A CN105699068A CN201610207995.8A CN201610207995A CN105699068A CN 105699068 A CN105699068 A CN 105699068A CN 201610207995 A CN201610207995 A CN 201610207995A CN 105699068 A CN105699068 A CN 105699068A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
The invention discloses a safety valve performance testing and online calibrator calibrating device. One channel of an outlet of a high pressure air source is connected with an inlet of a buffer bin via a stop valve, a pressure reducing valve, a pressure gage and a flow sensor in sequence while the other channel of the outlet of the high pressure air source is connected with a storage bin via a ball valve. The storage bin is also connected with a safety valve and a pressure gage. A temperature sensor is connected to the buffer bin. An upper outlet of the buffer bin is connected with a clamping table of the safety valve while a lower outlet of the buffer bin is connected with an air release valve. The outlet of the buffer bin is connected with an inlet of the to-be-tested safety valve. A first pressure sensor is connected to an inlet of the to-be-tested safety valve. An outlet of the storage bin is connected with a discharge port of the to-be-tested valve via a second flow sensor and a second pressure sensor. A safety valve online calibrator is mounted on the to-be-tested safety valve. The two pressure sensors, the temperature sensor and the two flow sensors are connected with a calibration testing control screen. By adopting the device provided by the invention, performance of the safety valve can be tested quickly; accuracy of the safety online calibrator can be calibrated; and safety valve performance tests in high-temperature environment and backpressure environment can be simulated.
Description
Technical field
The present invention relates to relief valve performance test and calibration equipment, particularly relate to a kind of relief valve performance test and on-line testing instrument calibration equipment。
Background technology
Relief valve is the most widely used a kind of safety attachment in the pressure-bearing kind equipments such as boiler, pressure vessel, pressure pipeline, in order to prevent pressure from exceeding the ultimate value of permission, it is ensured that the safe and reliable operation of system。Therefore, relief valve, as the final decompression protection device of production system, is commonly referred to as the last line of defense of production system safety。In bearing device production process, each pressure system, pressure source outlet are generally fitted with relief valve and system are carried out overpressure protection, especially being most widely used with spring Fall lift safety valve。And domestic relevant laws and regulations and standard all do not provide clear and definite discharge coefficient, as GB150-2011 " pressure vessel " and GB/T12241-2005 " requiring relief valve " specifies, when discharge medium is gas, take derated coefficient of discharge and carry out the calculating of Methods of Safety Valve Discharge Capacity, and derated coefficient of discharge is provided by relief valve maker or recorded by test。When relief valve dispatches from the factory, manufacturer all can be marked on nameplate derated coefficient of discharge, this is likely to be considered as discharge coefficient unique definite value when having resulted in calculating Methods of Safety Valve Discharge Capacity, actually Safety Valve Relieve Coefficient is not only relevant with the physical dimension of valve, the difference of discharge operating mode (there is certain back pressure in discharge pipe) and medium physical parameter will also result in the difference of emission factor, so the derated coefficient of discharge demarcated on nameplate is actually incomplete, it is not necessary to be applicable to actual discharge operating mode。Additionally, the compressible gas that domestic and international relevant laws and regulations and standard specify discharge capacity formula under subcritical discharge is only applicable to the discharge capacity account that relief valve back pressure is known, and the relief valve in actual production process is often connected to discharge tube, owing to the superimposed back pressure that pipeline crushing brings cannot be determined in advance, thus can not get the relief valve back pressure of reality to carry out discharge capacity account accurately, cause that relief valve type selecting is forbidden, it is necessary to the test device of simulation actual condition carries out relief valve performance test。
The unlatching of spring safety valve, closing motion be dependent on its entrance point pressure medium change and initial tension of spring to make spool automatically turn on and to close。When pressure medium (intrinsic pressure) be increased to lifting force bigger than initial tension of spring time, spool overcomes initial tension of spring to automatically turn on, unnecessary medium of releasing, make interior drops, again due to the effect of spring force, when intrinsic pressure be down to safety value time, spool is automatically switched off, stopping of releasing。Around this principle, when measuring (also known as hot) or adjust relief valve online, if being provided an additional force upwards by outside, then when the summation of pressure medium Yu this additional force just overcomes initial tension of spring, spool equally also can be opened, even at not having under off-line (also known as the cold conditions) condition of medium effect, individually made every effort to overcome when taking initial tension of spring by external add-in, spool also can be opened, current judging and opening method has base sonde method, audio frequency method, displacement method, additional external force knee of curve, the relief valve on-line testing technology that additional external force knee of curve is the most ripe at present sentences out criterion。The safety valve testing precision key factor of relief valve on-line testing instrument is to sentence out criterion accuracy, especially knee of curve method of identification needs precisely to catch the flex point that relief valve is opened, the parameter such as relief valve inlet pressure and flow cannot be verified by Accurate Determining, it is necessary to the calibration equipment of a set of actual condition of precision analog more verifies the accuracy of safe on-line testing instrument during on-line testing。
Summary of the invention
Open and the accuracy of discharge performance, verification relief valve on-line testing instrument to accurately measure existing spring loaded safety valve, it is an object of the invention to provide a kind of relief valve performance test and on-line testing instrument calibration equipment, its structure is relatively easy, manufacturing cost is relatively low, can quickly detect the performance of relief valve and the device of verification on-line testing instrument accuracy。
The technical solution used in the present invention is:
The present invention includes multiple gas cylinder, bus-bar, stop valve, air relief valve, Pressure gauge, flow transducer, first flow sensor, relief valve grain-clamping table, the first pressure transducer, adjustment controlling test screen, temperature sensor, surge tank, experimental safe valve, the second pressure transducer, second flow sensor, storage tank, ball valve, relief valve, Pressure gauge, atmospheric valve and relief valve on-line testing instrument；
Multiple gas cylinders and bus-bar also connect composition high-pressure air source, and the outlet of high-pressure air source is divided into two-way, and a road is connected with the entrance of surge tank through stop valve, air relief valve, Pressure gauge, electromagnetic valve and flow transducer successively；Another road is connected with storage tank upper port through ball valve, and storage tank is further connected with relief valve and Pressure gauge；Being connected to temperature sensor on surge tank, surge tank upper outlet connects with relief valve grain-clamping table, and under surge tank, outlet is connected with atmospheric valve；Surge tank upper outlet is connected with the entrance of experimental safe valve, and the first pressure transducer is connected on the porch of experimental safe valve；Outlet connects through the floss hole of second flow sensor, the second pressure transducer and experimental safe valve；Relief valve on-line testing instrument is arranged on experimental safe valve；First pressure transducer, temperature sensor, first flow sensor, second flow sensor and the second pressure transducer are connected with adjustment controlling test screen。
Described experimental safe valve grain-clamping table, adopts DN10～400mm that Si Mingte (Jinan) company produces to clamp with hydraulic pressure scroll chuck, and clamping inside nominal diameter is DN10～400mm relief valve。
The plurality of gas cylinder is 2～10, is each attempted by bus-bar。
The invention have the advantages that:
1) quickly test spring relief valve performance discharge capacity, set-pressure, blow pressure can be included；
2) accuracy of relief valve on-line testing instrument is verified；
3) the relief valve performance test of hot environment, back pressure environment, safe on-line testing instrument precision checking can be simulated。
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of the present invention。
Fig. 2 is experimental safe valve and relief valve on-line testing instrument installation diagram。
In figure: 1, multiple gas cylinders, 2, bus-bar, 3, stop valve, 4, air relief valve, 5, Pressure gauge, 6, electromagnetic valve, 7, first flow sensor, 8, relief valve grain-clamping table, 9, the first pressure transducer, 10, adjustment controlling test screen, 11, temperature sensor, 12, surge tank, 13, experimental safe valve, the 14, second pressure transducer, 15, second flow sensor, 16, storage tank, 17, ball valve, 18, relief valve, 19, Pressure gauge, 20, atmospheric valve, 21, relief valve on-line testing instrument。
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described。
As shown in Figure 1 and Figure 2, the present invention includes multiple gas cylinder 1, bus-bar 2, stop valve 3, air relief valve 4, Pressure gauge 5, flow transducer 6, first flow sensor 7, relief valve grain-clamping table the 8, first pressure transducer 9, adjustment controlling test screen 10, temperature sensor 11, surge tank 12, experimental safe valve the 13, second pressure transducer 14, second flow sensor 15, storage tank 16, ball valve 17, relief valve 18, Pressure gauge 19, atmospheric valve 20 and relief valve on-line testing instrument 21。
Multiple gas cylinders 1 and bus-bar 2 also connect composition high-pressure air source, and the outlet of high-pressure air source is divided into two-way, and a road is connected with the entrance of surge tank 12 through stop valve 3, air relief valve 4, Pressure gauge 5, electromagnetic valve 6 and flow transducer 7 successively；Another road is connected with storage tank 16 upper port through ball valve 17, and storage tank 16 is further connected with relief valve 18 and Pressure gauge 19；Being connected to temperature sensor 11 on surge tank 12, surge tank 12 upper outlet connects with relief valve grain-clamping table 8, and 12 times outlets of surge tank are connected with atmospheric valve 20；Surge tank 12 upper outlet is connected with the entrance of experimental safe valve 13, and the first pressure transducer 9 is connected on the porch of experimental safe valve 13；The floss hole that storage tank 16 exports through second flow sensor the 15, second pressure transducer 14 and experimental safe valve 13 connects；Relief valve on-line testing instrument 21 is arranged on experimental safe valve 13；First pressure transducer 9, temperature sensor 11, first flow sensor 7, second flow sensor 15 are connected with adjustment controlling test screen 10 with the second pressure transducer 14。
Described experimental safe valve grain-clamping table 8, adopts DN10～400mm that Si Mingte (Jinan) company produces to clamp with hydraulic pressure scroll chuck, and clamping inside nominal diameter is DN10～400mm relief valve。
The plurality of gas cylinder 1 is 2～10, is each attempted by bus-bar 2。
Adjustment controlling test screen 10 and relief valve on-line testing instrument 21 are standard component, can commercially choose。
The operation principle of the present invention is:
1) unlatching of experimental safe valve 13, closing motion are dependent on the high-pressure air source 1 of its entrance point by being decompressed to surge tank 12, and in surge tank 12, pressure medium change or applying external force counteracting experimental safe valve 13 initial tension of spring make spool open and close。When surge tank 12 pressure (intrinsic pressure) be increased to lifting force bigger than initial tension of spring time (experimental safe valve 13 can be promoted to by the lifting device reinforcing of relief valve on-line testing instrument 21 during simulating Safety valve on-line testing to discharge), spool overcomes initial tension of spring to open, release unnecessary medium, experimental safe valve 13 inlet pressure continues to raise, experimental safe valve 13 is opened into maximum height, reach specified discharge capacity, after the medium of high pressure is released, make interior drops (relief valve on-line testing instrument 21 can be passed through during simulating Safety valve on-line testing and discharge lifting force by 13 times seats of experimental safe valve), again due to the effect of spring force, when intrinsic pressure be down to safety value time, spool is closed, release stopping。
2) for there is the experimental safe valve 13 of back pressure, outlet at experimental safe valve 13 connects the storage tank 16 of certain pressure (determining according to experimental safe valve applying working condition), and the big I of back pressure regulates the pressure of storage tank 16 by high-pressure air source (gas cylinder 1 and bus-bar 2 vent ball valve 17)。
3) at experimental safe valve 13 from being opened into closing process, adjustment controlling test screen 10, by the first pressure transducer 9 of acquisition test pipeline, temperature sensor 11, first flow sensor 7, the second flow sensor 15 of back pressure unit and the second pressure transducer 14 data, draws the pressure history of whole experimental safe valve 13 process of the test, flow changing curve figure thus reaching the test of experimental safe valve 13 and relief valve on-line testing instrument 21。
Relief valve performance test:
1) experimental safe valve 13 is fixed on safety valve hydraulic grain-clamping table 8；
2) select to be suitable for first pressure transducer the 9, second pressure transducer 14 of range, first flow sensor 7, second flow sensor 15 and temperature sensor 11 to be installed on pipeline；
3) opening adjustment controlling test screen 10 power supply, first pressure transducer the 9, second pressure transducer 14, first flow sensor 7, second flow sensor 15 and temperature sensor 11 are in state to be collected；
4) high-pressure air source of gas cylinder 1 is opened to storage tank 16 (volume 5m3) ball valve 17, when storage tank 16 reach set pressure, close ball valve 17 (when need to have back pressure test)；
5) opening the high-pressure air source of gas cylinder 1, open stop valve 3, gases at high pressure connect Pressure gauge 5 through air relief valve 4, and electromagnetic valve 6 is opened, and make surge tank 12 (volume 1m3) it being forced into that experimental safe valve 13 is micro-to be opened, the first pressure transducer 9 gathers the internal pressure P opening momentz, this pressure is the set-pressure of experimental safe valve 13；
6) raise test loine pressure to experimental safe valve 13 full open, discharge about 5 second time, now the data P of the first pressure transducer 9 that adjustment controlling test screen 10 gathers0, the second pressure transducer 14 data p1, temperature sensor 11 data T0, the flow area A of input relief valve 13, specified that by formula GB150-2011 the theoretical displacement of compressible gas is calculated as follows:
In formula: W Methods of Safety Valve Discharge Capacity value, kg/s；
The minimum discharge area of A relief valve or rupture disk, mm2；
K discharge coefficient；
P1Relief valve back pressure (absolute pressure)；KPa；
P0The discharge pressure (absolute pressure) of relief valve, including set-pressure and excessive pressure limit two parts, kPa；
The molal weight of M gas, kg/kmol；
The coefficient of compressibility of Z gas, for air Z=1.0；
K is the adiabatic exponent under import situation (for ideal gas, k is equal to specific heat ratio) when discharge
T0The temperature of gas, K。
The displacement value of experimental safe valve 13 is calculated by formula (2)；
7) closing electromagnetic valve 6 and reduce test loine pressure, make experimental safe valve 13 valve return seat, adjustment controlling test screen 10 gathers, by the first pressure transducer 9, the blow pressure P that pressure is relief valve 13H；
8) stop high-pressure air source supply, open atmospheric valve 20 and release loine pressure, remove experimental safe valve 13。
Relief valve on-line testing instrument verifies:
1) the experimental safe valve 13 through above-mentioned Experimental Calibration is fixed on safety valve hydraulic grain-clamping table 8；
2) safe on-line testing instrument 21 framework is fixed on experimental safe valve 13, selects the range that the built-in pressure transducer of relief valve on-line testing instrument 21 is suitable；
3) select to be suitable for first pressure transducer the 9, second pressure transducer 14 of range, first flow sensor 7, second flow sensor 15 and temperature sensor 11 to be installed on pipeline；
4) opening adjustment controlling test screen 10 power supply, first pressure transducer the 9, second pressure transducer 14, first flow sensor 7, second flow sensor 15 and temperature sensor 11 are in state to be collected；
5) high-pressure air source of gas cylinder 1 is opened to storage tank 16 (volume 5m3) ball valve 17, when storage tank 16 reach set pressure, close ball valve 17 (when need to have back pressure test)；
6) opening the high-pressure air source of gas cylinder 1, open stop valve 3, gases at high pressure connect Pressure gauge 5 through air relief valve 4, and electromagnetic valve 6 is opened, and raise surge tank 12 pressure and open the 70% of pressure to experimental safe valve 13；
7) opening the lifting device of relief valve on-line testing instrument 21, reinforcing to experimental safe valve 13 is opened。
Opening moment at experimental safe valve 13, relief valve on-line testing instrument 21 gathers the data F of external add-in powerW, adjustment controlling test screen 10 gathers data P by the first pressure transducer 9L, the second pressure transducer 14 gather data P1, the data A of the flow area of input relief valve 13, formula (2), (3) calculate the set-pressure of experimental safe valve 13。The condition that spool is opened is:
FT=FW+PL×A
Wherein: FTInitial tension of spring；FWExternal add-in power；
PLMedium actuating pressure；A flow area。
Then set-pressure P is: P=PL+FW/A(2)
When system exists back pressure, then set-pressure P is: P=PL+FW/A-P1
When cold conditions, FT=FW, it may be assumed that P=FW/A(3)
8) stop high-pressure air source supply, open atmospheric valve 20 and release loine pressure, remove relief valve on-line testing instrument 21 and experimental safe valve 13。
Above-mentioned detailed description of the invention is used for illustrating the present invention, rather than limits the invention, in the spirit and scope of the claims of the present invention, and any amendment that the present invention is made and change, both fall within protection scope of the present invention。
Claims (3)
1. a relief valve performance test and on-line testing instrument calibration equipment, it is characterized in that: include multiple gas cylinder (1), bus-bar (2), stop valve (3), air relief valve (4), Pressure gauge (5), flow transducer (6), first flow sensor (7), relief valve grain-clamping table (8), first pressure transducer (9), adjustment controlling test screen (10), temperature sensor (11), surge tank (12), experimental safe valve (13), second pressure transducer (14), second flow sensor (15), storage tank (16), ball valve (17), relief valve (18), Pressure gauge (19), atmospheric valve (20) and relief valve on-line testing instrument (21)；
Multiple gas cylinders (1) and bus-bar (2) also connect composition high-pressure air source, the outlet of high-pressure air source is divided into two-way, and a road is connected with the entrance of surge tank (12) through stop valve (3), air relief valve (4), Pressure gauge (5), electromagnetic valve (6) and flow transducer (7) successively；Another road is connected with storage tank (16) upper port through ball valve (17), and storage tank (16) is further connected with relief valve (18) and Pressure gauge (19)；Being connected to temperature sensor (11) on surge tank (12), surge tank (12) upper outlet connects with relief valve grain-clamping table (8), and under surge tank (12), outlet is connected with atmospheric valve (20)；Surge tank (12) upper outlet is connected with the entrance of experimental safe valve (13), and the first pressure transducer (9) is connected on the porch of experimental safe valve (13)；Storage tank (16) outlet connects through the floss hole of second flow sensor (15), the second pressure transducer (14) and experimental safe valve (13)；Relief valve on-line testing instrument (21) is arranged on experimental safe valve (13)；First pressure transducer (9), temperature sensor (11), first flow sensor (7), second flow sensor (15) are connected with adjustment controlling test screen (10) with the second pressure transducer (14)。
2. a kind of relief valve performance test according to claim 1 and on-line testing instrument calibration equipment, it is characterized in that: described experimental safe valve grain-clamping table (8), adopting DN10 ~ 400mm that Si Mingte (Jinan) company produces to clamp with hydraulic pressure scroll chuck, clamping inside nominal diameter is DN10 ~ 400mm relief valve。
3. a kind of relief valve performance test according to claim 1 and on-line testing instrument calibration equipment, it is characterised in that: the plurality of gas cylinder (1) is 2～10, is each attempted by bus-bar (2)。
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Cited By (7)
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| CN108362489A (en) * | 2018-03-27 | 2018-08-03 | 河南省铭澳特种设备检测有限公司 | A kind of versatile testing device of safety valve |
| CN109186982A (en) * | 2018-09-25 | 2019-01-11 | 芜湖优能自动化设备有限公司 | A kind of pressure-detecting device for relief valve |
| CN109238686A (en) * | 2017-07-06 | 2019-01-18 | 北京康斯特仪表科技股份有限公司 | Detector for safety valve and safety valve detection method |
| CN112345232A (en) * | 2020-10-30 | 2021-02-09 | 湖北特种设备检验检测研究院 | Online checking device capable of being provided with built-in safety valve and using method |
| CN112945544A (en) * | 2021-03-26 | 2021-06-11 | 重庆科技学院 | Intelligent setting pressure measuring system for safety valve |
| CN113074933A (en) * | 2021-03-18 | 2021-07-06 | 深圳市特种设备安全检验研究院 | Safety valve discharge capacity testing device and method |
| CN114199551A (en) * | 2021-11-22 | 2022-03-18 | 华中科技大学 | High-speed flow impact testing device and method for high-pressure one-way valve |
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