Throttle is pneumatic by switching -over valve

The utility model provides a throttle is pneumatic by switching -over valve, the discharge gate inboard sets firmly the liquid medium's that the discharge gate that is used for reducing expenditure flows out orifice union, the orifice union is including throttle mouth and throttle unit, the throttle portion and the portion of leading to are entirely separated into with the discharge gate to the orifice union, still be equipped with the control assembly of steerable throttle portion and full expert portion break -make between valve body and the orifice union, control assembly holds and the control end including the linkage, and control assembly's linkage end and case linkage are connected, control assembly's control end includes first control end and second control end, throttle portion and full expert controls respectively to first control end and second control end liquid flow to to when control assembly rotated along with the case, when first control end during with UNICOM of throttle portion, the second co