poppet valve
Noun: A poppet valve is a type of valve with a mushroom-shaped head (the "poppet") that moves perpendicularly (straight up and down) from its sealing surface (the "seat"). It is designed to open and close a passage, typically for controlling the flow of a gas or liquid. This valve is most commonly associated with controlling the intake of air/fuel mixture and the exhaust of combustion gases in internal-combustion engines.
The term poppet valve is used to describe a specific mechanical component in engineering, particularly in automotive and mechanical contexts. It refers to the valve itself, its design, and its function.
Examples: * The engine's performance depends on the precise timing of the poppet valves. * A worn poppet valve can lead to a loss of compression in the cylinder. * The mechanic is replacing the exhaust poppet valve.
- Valve Train: The poppet valve is a critical part of the valve train, which includes components like camshafts, lifters, pushrods, and rocker arms that work together to open and close it.
- Valve Float: At very high engine speeds, an inertia problem called valve float can occur, where the poppet valve fails to follow the camshaft profile and close properly.
- Poppet (noun): Can refer to the disc-shaped closing part of the valve itself.
- Intake Valve (noun): A poppet valve that opens to allow the air-fuel mixture into the combustion chamber.
- Exhaust Valve (noun): A poppet valve that opens to allow burnt gases to exit the combustion chamber.
- Overhead Valve (OHV) (noun): An engine design where the poppet valves are located in the cylinder head.
- Valve Seat (noun): The machined surface against which the poppet valve closes to form a seal.
- Mushroom Valve: A descriptive synonym based on its shape.
- Disc Valve: Refers to the flat, disc-like sealing part of the valve.
- To lap a valve: A maintenance procedure involving grinding the poppet valve against its seat to ensure a perfect seal.
- Valve clearance / valve lash: The small gap between the valve stem and the mechanism that opens it (e.g., rocker arm), crucial for proper poppet valve operation.
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a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines
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