Function Of Expansion Valve

expansion valve
An expansion valve is a slide valve used in a steam engine to control the cut-off. It rides on the back of an adapted main slide valve and is driven by an additional eccentric that has more advance than the main eccentric. The cut-off is adjusted in one of two ways.
A part of an air-conditioning system, located between the Condenser and the Evaporator that regulates the flow of liquid Refrigerant to the vaporator.
A refrigerant-metering valve with a pressure or temperature controlled orifice.

function
perform as expected when applied; "The washing machine won't go unless it's plugged in"; "Does this old car still run well?"; "This old radio doesn't work anymore"
An activity or purpose natural to or intended for a person or thing
(mathematics) a mathematical relation such that each element of a given set (the domain of the function) is associated with an element of another set (the range of the function)
A basic task of a computer, esp. one that corresponds to a single instruction from the user
Practical use or purpose in design
serve: serve a purpose, role, or function; "The tree stump serves as a table"; "The female students served as a control group"; "This table would serve very well"; "His freedom served him well"; "The table functions as a desk"