What is the purpose of this pipe on the water ring pump?
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The water ring pump used for evacuating the condenser is equipped with a check valve on its pipe as well.
It’s the TC water ring pump from Geditnas, right? That is a valve to prevent overcompression. When the gas inside the pump is over-compressed, the valve opens
The pump’s own return line sends back the substances that have passed through the exhaust port but not been completely expelled, to the suction port.
It is presumed to be a safety valve; only positive-pressure pumps have safety valves, but negative-pressure pumps do as well