VALVE MECHANISM FOR ICE REMOVAL SYSTEM

摘要

A valve having inlet, outlet and exhaust ports for inflating and evacuating air from pneumatic ice removal tubes in which air is evacuated from the tubes through an exhaust port while a reduced amount of high pressure air from the inlet port is directed through an orifice to provide subambient pressure in the tubes in the deflated condition. High pressure air is rapidly injected into the tubes through the above-mentioned orifice supplemented by an additional valve opening provided by movement of a valve sleeve in response to closing of the exhaust port of the valve.