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2. Central vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Central_vacuum_cleaner

   In-wall vacuum inlet valve; Central power unit; Bagless dirt collection canister and auxiliary filter (click on photo to enlarge) Central vacuum systems require periodic emptying of the dirt canister or replacing the filter bag, typically 2–4 times per year.

3. Crankcase ventilation system - Wikipedia

   en.wikipedia.org/wiki/Crankcase_ventilation_system

   The intake manifold vacuum, with wide open throttle, is lower in these conditions, which causes the PCV valve to open and the crankcase gases flow to the intake system. [13] The greater flow rate of intake air during these conditions means that a greater quantity of blow-by gases can be added to the intake system without compromising the ...

4. Rocker cover - Wikipedia

   en.wikipedia.org/wiki/Rocker_cover

   A rocker cover, (UK), or valve cover (elsewhere) is a cover that encloses the rocker arm in an internal combustion engine, bolting with a gasket seal to the engine head. Engines with more than one head (such as a V8 ) will have multiple rocker covers.

5. Plenum chamber - Wikipedia

   en.wikipedia.org/wiki/Plenum_chamber

   Simple direct ducting would give problems where the nearest cylinders received more airflow. The pulsating demand from the cylinders would also show problems of either pressure waves in the duct, or a shortage of inlet air towards the end of the inlet phase. The solution is to provide a large-volume plenum chamber between the inlet and the ...

6. Bell mouth - Wikipedia

   en.wikipedia.org/wiki/Bell_mouth

   A bell-mouth inlet duct is a form of convergent inlet air duct used to direct air into the inlet of a gas turbine engine. The area of a convergent duct gets smaller as the air flows into the engine. A bell-mouth inlet duct is extremely efficient and is used where there is little ram pressure available to force the air into the engine.

7. Stuffing box - Wikipedia

   en.wikipedia.org/wiki/Stuffing_box

   A gland is a general type of stuffing box, used to seal a rotating or reciprocating shaft against a fluid. The most common example is in the head of a tap where the gland is usually packed with string which has been soaked in tallow or similar grease.