Needle valve knowledge

Summary

The needle valve is a trim valve whose plug is needle-shaped and is mainly used to regulate air flow.

Needle valve

Needle valve

The needle valve is a kind of throttle valve and its adjustment accuracy is relatively high.

The valve is needle-shaped and moves in the direction of the flow of water, changing the flow-breaking area to shut off or regulate the flow of the valve.

The needle valve is a trim valve whose valve plug is needle-shaped and is mainly used to regulate air flow. The trim valve requires that the opening of the valve be gradually increased, and that the maximum can be finely adjusted continuously from closing to opening. Needle valve plugs can achieve this function. The needle valve plug is generally made of hardened steel long needles, and the valve seat is made of soft materials such as tin and copper. The seal between the valve needle and the valve seat is achieved by the tight fit of its cone surface. The taper of the valve needle has two types of taper: 1:50 and 60 taper, and the surface of the taper must be finely ground. The sealing of the valve stem and valve seat is achieved by bellows.

Maximum working pressure: 6000PSI (414Bar)

Maximum temperature range: -65F°F to 600F (-54°C to 316°C)

Valve size: (imperial) 1/4" - 1"

(Metric) 6mm — 12mm

Connection type: Gyrolok double card sleeve, NPT thread

Body material: copper, 316SS, carbon steel and various special materials

Circulation capacity Cv: 0.4 - 1.2.