Patent ID: 8113156

Claim:
A hydraulic circuit, comprising: an added motion intake stroke assembly and an added motion exhaust stroke assembly, wherein each of the added motion intake stroke assembly and the added motion exhaust stroke assembly includes an added motion valve system including a cam system, an actuating mechanism including an actuator fluid volume, an engine valve and an engine valve spring, and a valve in fluid communication with the actuator mechanism, wherein the added motion valve system provides means for arranging the valve in a first orientation for permitting fluid to move into the actuator fluid volume and subsequently arranging the valve in a second orientation for impeding movement of the fluid within the actuating mechanism for causing the engine valve to be arranged in a locked orientation; a dump valve; and at least one check valve, wherein the dump valve and the at least one check valve are in fluid communication with the valve of the added motion valve system, wherein the dump valve and the at least one check valve provides means for recovering energy stored in the engine valve spring during the closing movement of the engine valve of the added motion valve system.