valve spring

noun

1. a helical spring used to hold closed a valve in the cylinder head of an internal-combustion engine
2. any spring that closes a valve after it has been opened mechanically or by flow pressure

Example Sentences

The engine had to be stopped three times, twice due to valve-spring collar failures and once due to a valve head breaking.

From Project Gutenberg

It will be noticed that a light valve-spring is shown in drawing.

From Project Gutenberg