Patent ID: 7234483

Claim:
An electro-pneumatic air pressure regulator comprising: a primary pressure introduction port; a secondary pressure output port; a pilot pressure chamber; a main valve for opening and closing a communicating conduit via which said primary pressure introduction port and said secondary pressure output port are communicatively connected with each other; a floating piston which moves in accordance with a difference in pressure between said secondary pressure output port and said pilot pressure chamber to actuate said main valve; a nozzle conduit via which said pilot pressure chamber is communicatively connected to the atmosphere; a flapper which includes a leaf spring facing an open end of said nozzle conduit; and an electromagnetic drive system which deforms said leaf spring to vary a position of said flapper relative to said open end of said nozzle conduit in accordance with the magnitude of an analogue input signal, wherein said flapper includes a conical projection which projects toward said open end of said nozzle conduit, and wherein a conical recess corresponding to said conical projection is formed on an end face of said nozzle conduit around said open end thereof.