Definition - What does Poppet Valve mean?
A Poppet Valve, also known as a mushroom valve is a device that is used to control the opening, closing and the quantity of gas or vapor that flows into an internal combustion engine. In an oilfield, the valve is usually a part of pressure control equipment used during well workover and intervention process to kill or choke the flowline.
Petropedia explains Poppet Valve
Poppet valves are used as check valve to help in halting the flow of hydrocarbons from the main production line. These valves also commonly used in steam and internal combustion engines. They are placed in the intake and exhaust ports on the cylinder head of an engine which operates in sync with the movement of pistons inside the cylinder. The valve is usually a flat disk of metal with a long rod, known as the valve stem, attached to one side. The purpose of the valve stem is to push down the poppet valve to open it, with a spring generally being used to return it to the closed position when the stem is not being depressed.
In IC engines, instead of springs, the cams and cam followers are used to push the valve stem of the poppet valves for proper operation of the engine.