Computer-based data acquisition of low-temperature valve testing device - valve, valve, test - Pump Industry

Computer-based data acquisition of low-temperature valve testing device - valve

, valve, test - Pump Industry

HC Valve Network: Describes a computer-based data acquisition of low-temperature valve performance testing device, which has concentrated on the test data storage, display and print functions, and can achieve self-pressurized tank of liquid nitrogen control system, can improve test the efficiency of the operation of timeliness, accuracy and safety. Pointed out that the computer technology and test equipment used optical technology is the future direction of development.

1, Overview With low technology, low-temperature fluids are more widely used, such as liquid nitrogen is widely used in industrial production, scientific research fields, and medical care, liquid nitrogen and liquid oxygen as rocket propellants in the defense area show significant advantages. In addition, in recent years, with the Energy Shortage of liquefied natural gas has become one of the major energy sources. In all aspects of using low-temperature liquid, low temperature valve is essential pipeline accessories. However, such valves and more work in less than -100 Low Wen Wen District, so its structural design, material selection, manufacturing processes and inspection and test all put forward specific requirements. Especially in the low-temperature valve product testing, in addition to room temperature should meet the same performance in a variety of common valve test requirements, even under low-temperature performance test. The main task of low temperature test is to test the temperature of the gas-tight valve and opening and closing capabilities. Therefore important to test devices, the device determines the performance of the advanced nature of the accuracy and reliability of test results. To this end developed a new type of low-temperature valve integrated test device, features include low-temperature experiments and two cryogenic treatment, in which the temperature signals, pressure signals and valve leakage and other data acquisition systems through the use of computer automated measurement. The device has a focus on the test data storage, display and print functions. This article focuses on the device in the valve seat Seal Low temperature tests in terms of content.

2, low temperature test devices on

Home and abroad involving low temperature valve manufacturers and research institutions on the low temperature performance test valve attaches great importance to and actively carry out research and development in this area. As a result of Refrigeration And low temperature in different ways, in the arrangement of test equipment there are great differences. Are often used and kept cold with dipping method in two ways. Impregnation (ie external cooling method) is equipped with a valve directly into liquid nitrogen cooling the Cooling box, when the valve temperature to operating temperature before quenching with helium seal performance test. Cold preservation method (ie the internal cooling method) is to protect the valve installed in the cold box, which leads to low temperature within the cooling medium into the valve, when the temperature dropped to the specified value, it will let go of low-temperature medium, and then pass into the provisions of the pressure of the helium trial. There are also spray method is to protect the valve installed in the cold box, use the spray head to ensure sprayed into liquid nitrogen cold box, cold box temperature when Paul reached test temperature, stop the spraying of liquid nitrogen, and then pass the required pressure nitrogen into the trial. However, spraying is not appropriate for ultra-low temperature valves. Low-temperature test equipment used at home and abroad There are several.

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