Flow Needle Valves For Precise Dosages At the pressure determined by spring compression, system pressure overcomes spring pressure and the relief valve opens. They are often used to control flow of gas from a gas cylinder A back-pressure regulator is a variation of a valve in which flow is controlled to maintain a certain upstream pressure, if possible. Bila primary throttle valve hanya terbuka sedikit (pada bagian ringan) kevacuman dalam intake manifold besar, sehingga power piston akan terhisappada posisi atas. We offer our clients with a wide variety of Needle Valves that is modified as a variable restrictor. Ok, singkat kata, saya ingin berbagi kasus tersebut buat tmn2 sesama teknisi atau pun engineer mesin.Micrometering (needle) valves combine the ease of connection associated with Valco zero dead volume fittings with convenient bulkhead mounting. The fuel flows back to the tank without any pressure. Some common trade names associated with the valves we stock are as follows: Butte