Boost controller
Videos
In turbocharged internal combustion engines, a boost controller is a device sometimes used to increase the boost pressure produced by the turbocharger. It achieves this by reducing the boost pressure
A 3-port solenoid-type boost controller
A 4-port solenoid-type boost controller (used for a dual-port wastegate)
Needle valve
Videos
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.