Needle valves are used to regulate the pressure inside a device. They can be found in various systems and applications such as carburettors and some water heaters. Their use can help to ensure that the appliance is running at maximum efficiency, without excess water or gas being used. In larger-scale usage and delivery to numerous consumers, needle valves can be used to regulate the delivery of a product and relieve pressure on the systems used to distribute the relevant substances. 

Needle valves can also be used in vacuum systems, specifically to release a steady, controlled supply of gas without a great amount of pressure. The valve allows the supply of gas to be slowed down considerably before being shut off which helps to minimise stress and strain on internal machinery and components.

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