Understand the roz vacuum pump bypass valve
Release date:2016-08-12 Author: Click:
Roots pump without by-pass valve unit, should be first to start the water ring pump, is pumped gas in the system by the roots pump (gas propulsion roots pump rotor rotation, ordinary like flowmeter) after entering water ring pump discharge to the atmosphere, with water ring pump suction pressure (if there are big pump series, is a large pump suction pressure) first time to reach the roots pump rules value (that is, allow the exhaust pressure), beginning start roots pump, unit operation formally, start work.
Roots pump unit in the bypass valve, to start the first water ring pump, then start the roots pump, at this point, the roots pump inlet and exhaust pressure difference is bigger, bypass valve automatically open, by pumping the gas container a local by bypass valve into the water ring pump, another local under the action of roots pump into water ring pump by the pump will obviously extraction rate increases, so soon to reach the roots pump vacuum, into the exhaust pressure difference is small, the valve automatically shut down (or artificial closed), formal work unit. This method can greatly shorten the pre-pumping time, but the equipment is more complex.
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