lever and weight safety valve
double lever automatic weight 复式杠杆自动秤 lever and weight safety valve 杠杆重锤式安全阀 lever–weight type supercharge device 杠杆配重式加压装置 ..
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杠杆式安全阀主要依靠杠杆重锤的作用力而工作，但由于杠杆式安全阀体积庞大往往限制了选用范围。
Lever-type safety valve lever to rely mainly on the weight of the work force, but the lever-type safety valve size often limit the choice of scope.
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