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Glite Dictionary
poppet valve

poppet valve

8.6
A disc-shaped engine part that moves up and down to open or close a hole for gases
  • noun
  • /ˈpɑːpɪt vælv/
  • Specialized
translation icon : válvula de tapón
  • When the poppet valve opens, it allows the exhaust gases to escape from the cylinder.

Examples

  • Technicians often replace poppet valves to ensure efficient engine performance.

  • Instead of cams and poppet valves, the cylinder liner ties to the crankshaft through a 2:1 reduction as a way of opening and closing exhaust and intake ports.

    Academic text (2002)

  • The engine uses poppet valves to control the flow of air and fuel into the combustion chamber.

Synonyms

poppet
vspoppet valve
  • Specialized
1 9.9

A mushroom-shaped engine valve that moves up and down to control gas flow

means the same but names either a disc or mushroom shape

Surface Forms

poppet valve singular
poppet valves plural

Morphology

poppet + valve

The compound is fully compositional: 'poppet' refers to a mushroom-shaped (or disc-like) component and 'valve' denotes a flow-control device, so the phrase straightforwardly describes a valve with a poppet-shaped sealing element. Even though 'poppet' is technical, a learner who knows both constituent meanings can derive the MWE's meaning.

Etymology

Poppet valve is a kind of valve with a small, mushroom-shaped poppet (a disc) that moves straight up and down to 'open' or 'close' an engine passage. So, the image of the little disc lifting to let gas through and dropping to stop it explains why the name refers to a valve that controls flow.