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.
锻造用的重锤，通过带枢轴的杠杆将它倾斜抬起，然后落下。
A heavy forge hammer having a pivoted lever by which it is tilted up and then allowed to drop.
锻造用的重锤，通过带枢轴的杠杆将它倾斜抬起，然后落下。
A heavy forge hammer having a pivoted lever by which it is tilted up and then allowed to drop.
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