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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 '.
Description. The Poppet Valve block models a variable orifice created by a cylindrical sharp-edged stem and a conical seat. The flow rate through the valve is proportional to the valve opening and to the pressure differential across the valve.The flow rate is determined according to the following equations:escription. The Poppet Valve block models a variable orifice created by a cylindrical sharp-edged stem and a conical seat. The flow rate through the valve is proportional to the valve opening and to the pressure differential across the valve. The flow rate is determined according to the following equations: where.