At first, it studied the plant model of position and force system about valve control unsymmetrical hydraulic ram.
首先，建立了阀控非对称缸位置控制系统与力控制系统的数学模型。
2
Most of the valve is sealed using force, that the valve is closed, forced to rely on external ram pressure to the valve seat to ensure the sealing surface of the seal.
大部分闸阀是采用强制密封的，即阀门关闭时，要依靠外力强行将闸板压向阀座，以保证密封面的密封性。
3
The motion process of vibrating plate ram was analyzed, and the force bearing formulae of plate ram was derived.