High Pressure Fuel Pump With Configuration To Mitigate Cavitation

A fluid pumping flow control device designed for use in a high-pressure fluid system, operating between 200 bar and 3000 bar pressure, and comprising:

• a device body with a cavity and a high-pressure circuit;
• a plunger placed in the specified cavity designed for reciprocal motion;
• a cap at the end of the device body;
• a seal installed between the cap and the body;
• an inlet metering device communicating the supply pressure to the plunger pressure cavity;
• a volume around the inlet metering valve ranging from 5 to 20 times the volume displaced by the plunger;
• a communication passage extending from the inlet metering volume to the fuel side of the seal;
• a spill passage extending from the inlet metering volume to the pump tank port;
• and,
• a spring-loaded spill check valve located in the spill passage from the inlet metering volume to the tank;
• wherein the flow through the spill check valve depends on the positioning of the inlet metering valve and plunger motion;
• wherein the flow through the spill check valve takes place when the inlet metering valve is closed;
• wherein the flow through the spill check valve is suppressed when the inlet metering valve is open, and the plunger is refilling;
• wherein the fuel is never at a standstill in the inlet volume to the plunger.