The timing of the rotaryvalve, which is a key operating parameter for cryocoolers, determines the relationship between the intake and exhaust process.
而平面旋转阀的时序又是低温制冷机的一个重要参数，它决定了制冷机系统进气、排气过程之间的相互关系。
2
One of the key problems of designing the control valve of modulation rotary steering drilling tool is the design of high pressure hole of upside valve.