Exhaust valve arrangement and a fuel system incorporating an exhaust valve arrangement

An exhaust valve arrangement for use in a combustion chamber of a compression ignition internal combustion engine, the exhaust valve arrangement including:

• a piston which is movable outwardly from the combustion chamber in response to pressure generated within the combustion chamber as a result of combustion,
• an outer sleeve within which the piston is movable, wherein the outer sleeve is operable between open and closed positions to open and close, respectively, an exhaust passage from the combustion chamber,
• a pump chamber for receiving fluid, and
• a pumping plunger coupled to the piston and movable with the piston in response to pressure generated within the combustion chamber so as to pressurise fluid within the pump chamber as the piston is urged outwardly from the combustion chamber.

A fuel system for a compression ignition internal combustion engine, the fuel system including;

• at least one fuel injector for delivering fuel into the combustion chamber, and
• first and second exhaust valve arrangements, each of which includes an associated piston which is movable outwardly from the combustion chamber in response to pressure generated within the combustion chamber as a result of combustion.
• an outer sleeve within which the associated piston is movable, wherein the outer sleeve is operable between open and closed positions to open and close, respectively, an exhaust passage from the combustion chamber,
• an associated pump chamber for receiving fluid, and
• a pumping plunger coupled to the associated piston and movable wit the associated piston so as to pressurise fluid within the pump chamber as the associated piston is urged outwardly from the combustion chamber.