平衡重控制手柄
counterweight control lever
平衡平滑阀
self-balanced flat slide valve
平衡平面总绕
Balanced-in-plane winding
曲柄平衡式抽油机
crank-balanced pumping unit
异相曲柄平衡
non-synchronous crank balance
自动平衡平滑阀
self-balanced flat slide valve
[平]衡重
balance weight [= counter weight