Since the commercial revolution, we had been aware about the energy and advantages it brings. With the development of the whole society, we can not forget about the fact that industry tries to enhance our lifestyles. With the blooming of the enterprise, a few complicated conditions consisting of excessive strain, low temperature and radioactivity occur. Fortunately, we are able to use a few mechanical machines to do such styles of jobs to avoid the capacity non-public damages. In the course of the industrial system, valves are extensively used to control…
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