blowback

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blowback

[′blō‚bak]
(chemical engineering)
A continuous stream of liquid or gas bled through air lines from instruments and to the process line being monitored; prevents process fluid from backing up and contacting the instrument.
Reverse flow of fluid through a filter medium to remove caked solids. Also known as backwash.
(graphic arts)
To enlarge, or make an enlargement of, an image.
(mechanical engineering)

blowback

A characteristic of a safety valve; the difference between the pressure at which it opens and the pressure at which it closes automatically, after the excess pressure has been released.
References in periodicals archive ?
The basic blowback design is simple, and compared to more complex designs relatively easy and inexpensive to manufacture.
Many blowback designs have the barrel fixed to the frame, a feature that enhances accuracy.
Smaller centerfires and rimfires generally employ a direct blowback action (although some also utilize recoil-operated mechanisms).