I installed a pump under my laundry tubs, when it turns on to drain the waterfrom my washing machine into my waste line, my bathroom sinks gurgle and my toilet bubbles. Can I install a ball valve anywhere on that line to slow the waste water flow down

Hi Sally

A ball valve won't do anything here. The system is starving for air and is stealing it wherever it can (sink and the toilet).

What exact laundry pump did you install (model number and manufacturer please)? Most of these pumps require a dedicated vent (and not a mechanical vent, a dedicated, individual vent), so need more info. OK?

Back to you...

Mark

Why do you even need a separate pump to drain your washing machine?