An automatic bleeding valve or air release valve (ARV) is a plumbing valve used to automatically release trapped air from a heating system. Air, or other...

A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; excessive pressure might otherwise...

level. In automatic control terminology, a control valve is termed a "final control element". The opening or closing of automatic control valves is usually...

A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect water supplies from contamination. It is different...

variations) is a valve controlling the release of a fluid. Tap is used in the United Kingdom and most of the Commonwealth for any everyday type of valve, particularly...

welding. A handle is used to manually control a valve from outside the valve body. Automatically controlled valves often do not have handles, but some may have...

by turning a valve, or electronically. Electronic bidets are controlled with waterproof electrical switches rather than a manual valve. There are models...

A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little...

waste Backflow prevention must be automatic, and manually-operated valves are not usually acceptable. Automatic check valves are required to prevent back pressure...

A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline, consisting of a movable plug or disc element and a...