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A stroke is the action of a piston travelling the full length of its cylinder.In a two-stroke engine, one of the two strokes combines primarily the intake stroke and the combustion stroke, while the other stroke primarily combines the compression stroke and the exhaust stroke, though technically since both ports are exposed during both the combustion and compression strokes, some reversion ...
The V6 PRV engine is an overhead cam V6 automobile engine designed and manufactured by the company "Française de Mécanique" for PRV, an alliance of Peugeot, Renault and Volvo Cars. Sold from 1974 to 1998, it was produced in four displacements between 2.5 L and 3.0, and in both SOHC and DOHC and 2-valve and 4-valve per cylinder configurations.
The PRV was a shared 90° SOHC V6 engine, with later SOHC 24-valve and turbocharged additions. The PRV was shared between Peugeot, Renault, and Volvo Cars, thus the "PRV" name. It was produced from 1974 until it was phased out in favor of the PSA ES engine in 1998. PSA codenamed it the Z series internally. ZM — 2.7 L (2,664 cc)
Two-stroke engines which use crankcase compression do not require a crankcase ventilation system, since all of the gases within the crankcase are then fed into the combustion chamber. Many small four-stroke engines such as lawn mower engines and electricity generators simply use a draught tube connected to the intake system.
A relief valve DN25 on cooling water pipe from heat exchanger Schematic diagram of a conventional spring-loaded pressure relief valve. A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; excessive pressure might otherwise build up and create a process upset, instrument or equipment failure, explosion, or fire.
A typical nominal regulated gauge pressure from a medical oxygen regulator is 3.4 bars (50 psi), for an absolute pressure of approximately 4.4 bar and a pressure ratio of about 4.4 without back pressure, so they will have choked flow in the metering orifices for a downstream (outlet) pressure of up to about 2.3 bar absolute.