作为气体和蒸汽受压容器的主要安全装置的安全阀,当压力较高尤其是口径较大时,在排放时所产生的反作用力有时甚至可能高达数十吨。据国外有关资料报道,由于对排汽反作用力的估计不足,安全阀进口支管或连接管座的补强不足,以及反作用力支座的结构不当和刚度不够,以致安全阀在初次投 Safety valves, which are the main safety devices for gas and steam pressure vessels, can sometimes react up to tens of tons of reaction force at discharge when the pressure is high, especially at large caliber. According to foreign reports, due to the lack of estimation of the exhaust reaction force, the safety valve inlet manifold or connecting pipe seat reinforcement deficiencies, as well as the structure of the reaction force bearing improper and rigidity is not enough, so safety valve in the initial investment