Needle valve

Is a fine needle Instrument valve , the valve plug into a needle shape, mainly for regulating the flow of solar term. Fine adjustment Instrumentation ball valves required valve port opens gradually become larger, maximum energy from the closed to open continuously adjusts. Needle valve plug that is able to achieve this function. Needle valve plug generally hardened steel with a long needle, while the seat is made of tin, copper and other soft materials. Valve needle and valve seat seal between the conical surface is depend on the close coordination to achieve. Taper needle valve 60 with 1:50 and two kinds of cone angle, cone surface after fine grinding. Stem and the valve seat seal between is to achieve by the bellows.