Pressure regulation apparatus

Abstract

An object of the present invention is to obtain a pressure regulation apparatus in a return-less fuel supply system, which can prevent fuel leakage into an engine when the air tightness of an injector valve decreases. A valve is provided on a diaphragm which is urged toward an inlet portion. A rod is provided in the center of the valve. The rod is inserted into a passage which communicates with the inlet portion. A ball valve which is urged in the direction of the rod is disposed inside the inlet portion. When the valve is pushed against a side wall on the inlet portion side, the valve closes and the rod extends into the inlet portion, thereby opening the ball valve. When the pressure of fuel passing through a gap between the rod and passage exceeds a valve-opening pressure of the valve, the valve opens and fuel is supplied into a pressure regulation chamber. When the internal pressure of the pressure regulation chamber reaches an upper pressure limit, the rod is caused to retreat by pressure acting on the diaphragm. As a result, the ball valve closes and the internal pressure of the pressure regulation chamber falls.

Dependencies are inferred from the claim text.