Abstract: There is provided a means for mounting a check valve into a housing including fluid passages therein that can secure a closing property between a valve body and a valve seat by preventing the deformation of the valve seat, can prevent the rattling of the check valve relative to the housing including fluid passages therein and can ensure the flow rate of fluid necessary at the time of start-up. The check valve 10 and a wave washer 54 are put into a housing space 52 of the housing 46 including fluid passages therein, so that the separation of the check valve 10 and the wave washer 54 from the housing space 52 is prevented by retaining means 58 and 62. When the check valve 10 and the wave washer 54 are mounted into the housing space 52, a repulsive force is caused in the wave washer 54.

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.