The use of coolant for rotary joints under high - speed operation is particularly difficult 冷却剂为了旋转接合尤其在高速条件下运用是非常特殊困难的。
2.
Especially the area of contact face of rotation has to be minimized to the minimum to allow rotation connection under high pressure 尤其是旋转接合面大小必须减低到最低限度做较高压力的旋转接合。
