1183 Types of vacuum pumps

For diesel engines which develop very little manifold depression, a separate vacuum pump driven from the engine is necessary to operate the brake servo. Vacuum pumps may be classified as reciprocating diaphragm or piston or rotary vane types.

In general, for high speed operation the vane type vacuum pump is preferred and for medium speeds the piston type pump is more durable than the diaphragm vacuum pump.

These pumps are capable of operating at depressions of up to 0.9 bar below atmospheric pressure. One major drawback is that they are continuously working and cannot normally be offloaded by interrupting the drive or by opening the vacuum chamber to the atmosphere.

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