What is Springless Valve System

What is Springless Valve System? Before answering the question, it is necessary to consider the working principle of motors. Internal combustion engines work in two or four-stroke stages. At these stages, air and fuel are taken into the cylinder, compressed, burned, and while the residual gases are expelled, power is produced by converting combustion energy (chemical energy) into motion energy (kinetic energy). In order to take air and fuel into the cylinder and to transfer the gases formed, cap-like structures (valves) at the top of the cylinder are opened and closed at certain periods. Relevant products are transferred to the cylinder from the opened spaces or taken out of the engine by cylinder movement. A spring is placed on the stem at the back of the valves and it enables the valve to open with the pushing force. At the top, there is a flat surface, and the cam-shaped structure on the camshaft exerts pressure here, keeping the valve closed. What are the Disadvantages o