back pressure


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back pressure

n
1. (Mechanical Engineering) engineering
a. the pressure that opposes the motion of a piston on its exhaust stroke in an internal-combustion engine
b. the exhaust pressure in external combustion engines
2. (Pathology) med the local pressure that builds up when fluid flow is obstructed in the cardiovascular or urinary systems
References in periodicals archive ?
A narrow or restrictive exit will obviously create a lot of back pressure (unwanted effect), but this in turn also means that the exhaust gases will have a higher escape velocity coming out of the engine (desired effect).
In a metering pump system, using a back pressure valve alone does nothing to improve fluid flow.
Apart from the runner length, runner volume, collector, back pressure and exhaust pulse, the physical shape of the manifold also has significant impact on exhaust velocity.
For good landings, pilots need to have what I call a fine pitch control--not too much, not too little back pressure.
The back pressure of blood in the aorta against the heart's aortic semilunar valve is higher than that against the pulmonic semilunar valve of the pulmonary trunk.
If the tank is located lower than the chilled water system piping, CV-5 and CV-6 could modulate to control back pressure.
Blood vessels in the gullet had exploded because of back pressure from my liver after drinking too much.
The leaked report stated the incident involved back pressure in one of the furnaces.
Its flapper technology allows high pressures to be achieved (up to 116 psi) at large orifice sizes while preventing the fluid contamination that can result from spikes in back pressure inherent in analytical devices.
VARICOSE VEINS These are knobbly swellings of veins where blood pools due to back pressure and damage to valves within the veins that prevent backward flow of blood.
Black color streaks were present with increased back pressure and when the color concentrate loading was increased from about 2 to 5%.