Valve, Needle

Needle valves are kind of throttle valves, similar in operation and designing of globe valves. These valves have a slender, tapered point at the end of the valve, which is lowered through the seat to block flow. These valves are used to control flow into delicate gauges, which might be damaged by sudden surge of fluid under high pressure and also to control the end of a work cycle.

Needle valves are available in stainless steel, bronze, cast iron etc depending on the kind of application and are designed with a metallic needle in materials including brass, bronze, stainless steel, along with seat generally made form PVC, CPVC, PTFE etc. Needle valves are normally manually operated, but can be modified to act as a variable restrictor. These valves are available in different types of end connections including double ferrule type, NPT, BSPT and many other standard connections and in various packing materials for different applications depending on requirements, temperature and medium to be moved.