Butterfly valve
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A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates.
Large butterfly valve used on a hydroelectric power station water inlet pipe in Japan.
Duplex valve in wafer butterfly configuration.
Cast iron butterfly valve
Cast iron butterfly valve
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.
Butterfly valve
…Globe valve Needle valve Plastic pressure pipe systems…
Giffard steam water injector (B-needle valve).
A needle valve.
Electrically automated needle valve fluid on a fluid processing system.