Quick Exhaust Valve Operation

exhaust valve
a valve through which burned gases from a cylinder escape into the exhaust manifold
A poppet valve is a valve consisting 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 shaft guides the plug portion by sliding through a valve guide.
(Exhaust valves) In the combustion process, these valves control the flow of the burnt air/fuel mixture to leave the engine and emerge into the atmosphere.

operation
The fact or condition of functioning or being active
a business especially one run on a large scale; "a large-scale farming operation"; "a multinational operation"; "they paid taxes on every stage of the operation"; "they had to consolidate their operations"
An active process; a discharge of a function
A business organization; a company
the state of being in effect or being operative; "that rule is no longer in operation"
(computer science) data processing in which the result is completely specified by a rule (especially the processing that results from a single instruction); "it can perform millions of operations per second"

quick
At a fast rate; quickly
accomplished rapidly and without delay; "was quick to make friends"; "his quick reaction prevented an accident"; "hoped for a speedy resolution of the problem"; "a speedy recovery"; "he has a right to a speedy trial"
any area of the body that is highly sensitive to pain (as the flesh underneath the skin or a fingernail or toenail)
promptly: with little or no delay; "the rescue squad arrived promptly"; "come here, quick!"