盘形阀结构简单、使用可靠、制造费用低等优点,在低压热煤气系统中使用中早已得到肯定。其缺点是严密性比较差。因此,在高压冷煤气系统中,一般都是沿用外国的技术规范,根本不准许使用盘形阀,只能用加工精密、经过研磨的煤气闸板阀。过去对这些不合理的情况,并没有人提出过任何反对的意见,只是盲目抄用。这显然是缺乏革命的、科学的实事求是精种。 Disc valve structure is simple, reliable, low manufacturing costs, the use of low-pressure hot gas system has long been affirmed. The disadvantage is the tightness is poor. Therefore, in high-pressure, cold-gas systems, foreign technical specifications are generally used, disc valves are not permitted at all, and only precision-machined, gas-laden gas gate valves are used. In the past, no one raised any objection to these unreasonable situations, but copied them blindly. Obviously, this is a lack of revolutionary and scientific realism.