The safety valve can make the lifting fluid-pressuredrive circuit of a fork lift truck or a crane obtain not only high efficiency ascending speed, but also reliable and safe descending speed.
该安全阀使叉车或起重机的起升液压驱动回路既有高效率的上升速度，又有可靠的安全下降速度。
2
Fx and the role of fluid in the plunger on the pressure balance, Fy occurred while rotating cylinder to generate torque, rotating drive shaft 5.
Fx与作用在柱塞上的液压力平衡，Fy则产生使缸体发生旋转的转矩，带动轴5转动。
3
The device is designed by means of the jetting principle, and it takes the high-pressure injected water as power fluid to drive the formation fluid returning to the surface.