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User currently offlineA/c train From United Kingdom, joined Jun 2001, 501 posts, RR: 3
Posted (15 years 2 months 2 weeks 3 days 1 hour ago) and read 898 times:

Are engine driven Hydraulic pumps mostly gear type pumps?

2 replies: All unread, jump to last
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 1, posted (15 years 2 months 2 weeks 3 days ago) and read 865 times:

No, they're usually the multiple piston / "swash plate" type...as are most electrically driven pumps. The output is controlled by varying the angle of the plate and thus stroke of the pistons. The plate will move relative to the demand on the system. This way a pump can be running but if the demand is minimal, actually moving little fluid ( compared to a high demand situation ). The pump's purpose is really just to supply fluid _volume_...the pressure coming from the restrictions that the various user systems place on the system as a whole.

User currently offlineF-WWAI From Andorra, joined Dec 1999, 131 posts, RR: 0
Reply 2, posted (15 years 2 months 1 week 3 days 4 hours ago) and read 834 times:

the pumps are running to constant pressure at their outlet. if more demand, the pressure tends to decrease, this makes the plate adjust providing for higher stroke of the pistons, thus retoring nominal pressure but at higher flow.
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