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back pressure

   Also found in: Medical, Acronyms, Encyclopedia, Wikipedia 0.01 sec.
back pressure
n
1. (Engineering / 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. (Medicine / Pathology) Med the local pressure that builds up when fluid flow is obstructed in the cardiovascular or urinary systems


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However, the exhaust manifold can create a back pressure which pushes against the cylinder, meaning that it has to exert more energy to push the exhaust out and prepare for the next firing.
The RPZ design features triple security to provide optimum protection against back pressure and back siphonage: two check valves and a discharge valve divide the unit into three chambers, each providing a separate pressure zone.
 
 
 
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