There are two correct answers to this question, which are A device that depends on head pressure to allow the flow of condensed water and A device that depends on head pressure, water on or off to allow water tho cool condenser. A person who works in home improvement would be likely to know the definition of this device.
If looking to purchase one, these valves can be found at home stores such as Home Depot and Lowes, as well as online stores like Amazon. The valve works, because it includes an adjustable spring-loaded diaphragm. This diaphragm is what reduces the pressure of the water.
A device that depends on head pressure to allow the flow of condensor water. A device that depends on head pressure, water on or off to allow water tho cool condensor. A device that depends on head pressure to allow the flow of condensor water A device that depends on head pressure, water on or off to allow water tho cool condensor