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Poppet valve & components, including valve stem oil seal. The yellow paint is a spring strength marking. A poppet valve (also called mushroom valve) is a valve typically used to control the timing and quantity of gas or vapour flow into an engine. It consists of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. The portion of the hole where the plug meets with it is referred as the 'seat' or ' valve seat '.
Poppets are only one of several different types of construction used in the manufacture of industrial directional control valves. Poppet valves are characterized by having a movable element (the poppet) that is used to direct the flow of a fluid or a gas through the valve body.oppet valves such as illustrated here feature a design that incorporates a seal that is crimped into the poppet's sealing face. The seal materials that are used include various types of rubber, plastics or other exotic polymers which are chosen based upon various operating conditions.