Patent ID: 7137332

Claim:
An actuator, comprising: a body having a throughhole with an abutting tip, a notch formed to cut across the throughhole, and a depression communicating with the base end of said throughhole, a pressure plate housed and supported in said depression, a rod installed in said pressure plate and inserted into said throughhole, a diaphragm sealing said depression in contact with an opposite end face relative to an end face on which said rod of said pressure plate is provided, and a nozzle installed in a communicating part with said depression of said throughhole so that the end face of said pressure plate on which said rod is installed, acts as a flapper, wherein: a tip side part of said throughhole of said body displaces due to an elastic deformation of said notch part when an input pressure is applied to said pressure plate via said diaphragm while a supply pressure is being applied to the interior of said depression.