Transmission : normally meshed helical gear drive, coupling sleeve shift and two lever operation. The transmission has five forward speeds and four backward speeds .
变速箱采用常啮斜齿轮传动，结合套换档、双杆机械操纵，前进五档、后退四档。
2
The adjustor consists of gears and worm-gear reducer, and the automatic controller circuit consists of pulse period discriminator, forward switch, backward switch and protector circuit.
调节器由齿轮和蜗轮蜗杆减速器组成；自动控制电路由脉冲周期鉴别、正向开关、反向开关及保护电路组成。
3
The handle (or gear box) of butterfly valve can be rotated backward or forward for 180 degrees.