Pilot valve controlled three-way fuel injection control valve assembly

A three-way fuel injection control valve assembly, comprising:

• a valve housing containing at least one valve chamber and a high pressure supply circuit, a drain circuit and an outlet circuit communicating with said at least one valve chamber;
• a supply valve member mounted for reciprocal movement within said at least one valve chamber between a closed position in which said high pressure supply circuit is isolated from said outlet circuit and an open position in which said high pressure supply circuit is in fluid communication with said outlet circuit, movement of said supply valve member from said closed position to said open position and from said open position to said closed position defining a supply period;
• a drain valve member mounted for reciprocal movement within said at least one valve chamber between an open position in which said outlet circuit is in fluid communication with said drain circuit and a closed position in which said outlet circuit is isolated from said drain circuit;
• a control volume positioned to receive high pressure fuel from said high pressure supply circuit;
• a solenoid operated two-way injection control valve positioned along said drain circuit for controlling the flow of fuel from said control volume through said drain circuit so as to cause the movement of said supply and said drain valve members between respective open and closed positions;
• and
• a transition flow loss limiting means for causing said drain valve member to be positioned in said closed position throughout said supply period when said supply valve member is in said open position to minimize high pressure supply fuel flow to drain during opening and closing of said supply valve member.