On abroad, impact valves incorporated in air impact molding machine are mainly disc valve and gridvalve. Each of these has its own characteristic.
国外的空气冲击造型机所使用的冲击阀，主要有圆盘阀及栅格阀两种，其各有特点。
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This paper give an advice that we can realize closed cycle control of feeding shaft by proportional valve and linear grid ruler instead of servo amplifier and servo motor.