👉 Counter-drain is a type of valve that is used to control the flow rate of a fluid from one location to another. It works by controlling the flow rate through the opening or closing of the valve, which can be done either by moving the handle or using an external actuator. Examples of counterdrains include valves that are used in water treatment systems to control the flow rate of water into and out of a system. They can also be used in plumbing systems to control the flow rate of
