Patent ID: 8925523
Filing Date: 2015-01-06
Classification: F02M

Abstract:
1. An internal combustion engine, comprising: a fuel circuit; a fuel tank positioned along the fuel circuit; a fuel pump positioned along the fuel circuit downstream of the fuel tank; a fuel pressure relief valve in fluid communication with the fuel pump and the fuel tank, the fuel pressure relief valve including a valve body, a valve body passage formed in the valve body, a valve body cavity, a first plunger seat positioned in the valve body cavity adjacent the valve body passage, a first plunger reciprocally mounted in the valve body cavity to form a sliding fluid seal interface with the valve body, a fuel chamber positioned in the valve body cavity between the first plunger and the valve body, a primary relief circuit positioned to permit fuel flow from the fuel chamber, and an auxiliary relief circuit positioned fluidly in parallel to the primary relief circuit to permit fuel to flow from the fuel chamber toward the fuel tank when the pressure in the fuel chamber is below a predetermined pressure level, the auxiliary relief circuit including a relief passage located along the sliding fluid seal interface, the first plunger including a first plunger cavity, the first plunger adapted to reciprocate between a closed position in abutment against the first plunger seat to block fuel flow through the valve body passage and an open position a spaced distance from the first plunger seat permitting flow through the valve body passage into the fuel chamber.