Back pressure
a resistant pressure exerted by liquid or gas against the forward motion or flow of an exhaust or pipe system:
Careful control of backpressure ensures an even supply of oil from the well.
Historical Examples
Its use is to show the amount of back pressure, and in a condensing engine to show the degree of vacuum obtained.
Modern Machine-Shop Practice, Volumes I and II Joshua Rose
But the back pressure of the cat’s body overloaded the discharge circuits.
Survival Tactics Al Sevcik
The back pressure saved will at once show in the pulling power of the engine, and every one will be surprised.
Farm Engines and How to Run Them James H. Stephenson
There is then no back pressure on the exhaust steam, theoretically.
Farm Engines and How to Run Them James H. Stephenson
So in using steam expansively the back pressure must be at a minimum, and this is especially true in the compound engine.
Farm Engines and How to Run Them James H. Stephenson
He opened the muffler so as to get rid of all back pressure, and opened the throttle to its widest extent.
Bert Wilson at the Wheel J. W. Duffield
The problem now is to get rid of that back pressure, and the old type engines give a hint how it may be done.
Motors James Slough Zerbe
As Bert had already explained to Dick, this was done to eliminate any back pressure from the exhaust gases.
Bert Wilson at the Wheel J. W. Duffield
There is no back pressure of blood here, so that the movement of fluid through the lymphatics is not hindered.
Physiology Ernest G. Martin
The line from d to e is therefore the exhaust line, and that from e to a is the back pressure line or counter pressure line.
Modern Machine-Shop Practice, Volumes I and II Joshua Rose
noun
(engineering)
the pressure that opposes the motion of a piston on its exhaust stroke in an internal-combustion engine
the exhaust pressure in external combustion engines
(med) the local pressure that builds up when fluid flow is obstructed in the cardiovascular or urinary systems
back pressure n.
Pressure exerted upstream in the circulation as a result of obstruction to forward flow, as when congestion in the pulmonary circulation results from failure of the left ventricle.
Read Also:
- Backpressure
a resistant pressure exerted by liquid or gas against the forward motion or flow of an exhaust or pipe system: Careful control of backpressure ensures an even supply of oil from the well.
- Back projection
background projection. the projection from the rear of previously photographed material on a translucent screen, used as background for a television or motion-picture shot. the projection of filmed action or stills on a translucent screen in front of which actors are lit and filmed: used to simulate an outdoor or location background in the studio. […]
- Back quote
back quote character “`” ASCII code 96. Common names: left quote; left single quote; open quote; ITU-T: grave accent; grave. Rare: backprime; INTERCAL: backspark; unapostrophe; birk; blugle; back tick; back glitch; push; ITU-T: opening single quotation mark; quasiquote. Back quote is used in Unix shells to invoke command substitution. (1996-11-26)
- Back rest
a support used to rest one’s back. Historical Examples Next I filled one of the rawhide panniers with brush, and lashed it across Jones’ neck for a back rest. A Man in the Open Roger Pocock For a moment or two the girl sat with her head against the back rest of the sofa, completely […]
- Backrest
a support used to rest one’s back. Historical Examples An adjustable centre seat with backrest could be used so as to provide accommodation for six passengers. Carriages & Coaches Ralph Straus