原文：Cryogenic Valves
Cryogenic Valves With the development of 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, liquefied natural gas has become the main energy sources. In all aspects of using low-temperature liquid, low temperature valve is essential piping 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 tightness test the contents of the low side.
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低温阀门
低温阀门 随着低温技术的发展,低温流体得到越来越广泛的应用,例如液氮被广泛地应用于工业生产、科研领域、医疗卫生等,液氮和液氧作为火箭推进剂在国防领域表现出显著优点。另外,近几年来,随着能源紧缺,液化天然气也成为主要能源之一。在使用低温液体的各个环节,低温阀门是不可或缺的管路附件。然而,由于该类阀门多工作在-100℃以下的超低温温区,因此对其结构设计、材料选择、制造过程及检验试验等均提出了专门的要求。尤其是在低温阀门产品检验中,除应满足常温下相同于通用阀门的各种性能检验要求外,还要进行低温条件下的性能测试检验。低温试验的主要任务是检测阀门在低温中的气密性和启闭性能等。因此测试装置十分重要,装置性能的先进性决定了测试结果的准确性和可靠性。为此研发了一种新型低温阀门综合性测试装置,功能包含低温试验和深冷处理两个方面,其中温度信号、压力信号以及阀门泄漏量等通过利用计算机数据采集系统实现自动化测量。该装置具有对试验数据集中储存、显示和打印功能。本文着重论述该装置在阀门阀座密封性方面低温试验的内容。