bleed valve

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bleed valve

[′blēd ‚valv]
(engineering)
A small-flow valve connected to a fluid process vessel or line for the purpose of bleeding off small quantities of contained fluid.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

bleed valve

A valve designed to relieve the back pressure in a compressor, which helps to reduce the angle of attack of the rotor blades and prevent compressor stall and compressor surge. A bleed valve permits higher mass airflow through the compressor and reduces the mass flow through the combustion chambers and turbine. This minimizes the tendency to stall or surge. Also known as an air-release valve, a bleed valve, and a pop-off valve.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved