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利用力的平衡关系设计的平衡机构，可使弹簧直接作用式安全阀的密封比压力变成系统工作压力的阶跃函数，为克服弹簧直接作用武安全阀的超前泄漏提供了有利条件．本文所介绍的实验验证了平衡关系对改善弹簧直接作用式安全阀密封特性的作用．
The balance mechanism designed by the balance of force can make the ratio of the pressure of the spring direct acting safety valve become a step function of the working pressure of the system and provide favorable conditions for overcoming the premature leakage of the valve. The experiment presented in this paper verifies the effect of the balance relationship on improving the sealing characteristics of the spring-loaded safety valve.