
A choke valve is a type of valve designed to create choked flow in a fluid. Over a wide range of valve settings the flow through the valve can be understood by ignoring the viscosity of the fluid passing through the valve; the rate of flow is determined only by the ambient pressure on the upstream side of the valve. In automotive contexts, a choke...
Found on
http://en.wikipedia.org/wiki/Choke_valve

A flow can be throttled by way of a choke valve. By inserting something with increasing width into the flow the size of the hole can be changed. By changing this size the flow can be choked.
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http://www.encyclo.co.uk/visitor-contributions.php
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