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对于动作简单、运动速度一经调定不需要变动的机床，在其液压回路中可采用固定节流小孔代替单向节流阀。文中介绍了节流小孔孔径的计算方法和实际使用的情况。
For the simple action, the movement speed once set does not need to change the machine, in its hydraulic circuit can be used to replace the fixed throttle orifice one-way throttle. This paper introduces the calculation method of aperture orifice and the actual use of the situation.