Needle valve
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A needle valve is a type of valve with a small port and a threaded, needle-shaped plunger. It allows precise regulation of flow, although it is generally only capable of relatively low flow rates.
Giffard steam water injector (B-needle valve).
A needle valve.
Electrically automated needle valve fluid on a fluid processing system.
Valve
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A valve is a device or natural object that regulates, directs or controls the flow of a fluid by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but ar
These water valves are operated by rotary handles.
Valve disc
The shut off butterfly valve for a Francis turbine at Gordon Power Station, Tasmania
Ball valve