Needle valve is a kind of valve that can be accurately adjusted. It has a wide range of uses, such as cutting distance for flame cutting. The knob for adjusting flame temperature is needle valve. Instrument needle valve is an important part of instrument measuring pipeline system. It mainly includes globe valve and ball valve. Its function is to open or cut off pipeline access. The spool of a needle valve is a very sharp cone that is inserted into the seat like a needle, hence its name.
Fluid flowing through the valve turns 90 degrees and passes through an orifice. Due to needle shape disk, a certain portion of the disk will pass through seat opening before disk comes in contact with the seat, which has matching tapered design as a disk. This arrangement permits a very gradual increase or decrease in the size of the opening.
Needle valve has forged and machined body. This body can be of forged carbon steel or stainless steel depending on the services requirements. A seat can be a soft, metal or composite, same as globe valve. Normally needle valves are used in smaller sizes and are provided with either screwed or socket weld end.
All the aspect of needle valve are same as a global valve except its size and pointed needle like disk. You can refer globe valve for more detail.
- Standard: API, DIN, JIS, GB.
- Material: Stainless Steel, Carbon Steel, Alloy Steel, Titanium, 904l, Forged Steel.
- Size: 1/2″~2″, DN15~DN50.
- Pressure: 150LB~2500LB, PN10~PN420.
- Type: Angle Type, Union Bonnet.
Needle Valve Application
- All field analog instruments are fitted with a needle valve to control flow entry, where sudden surges of fluid under pressure can damage the instruments.
- Needle valves can be used in situations where the flow must stop gradually and in an application where precise adjustments of flow are required or where a small flow rate is desired such as sample points in the piping
- Needle valves can be used as both on/off and throttle valves
- Used in all type of industries for controlling and metering applications of fluid such as steam, air, gas, oil, water or other non-viscous liquids.