Do You Know How Needle Valves Work?

Needle valve (Needle Valve) is an important part of the instrument measurement piping system. It is a valve that can accurately adjust and cut off the fluid. The valve core is a very pointed cone. It is generally used for smaller flow rates and higher flow rates. Pressure gas or liquid, the structure is similar to the stop valve, its function is to open or cut off the pipeline access valve.

Needle valve structure principle

1. Needle valve In piping systems and devices with low-temperature media, low-temperature needle valves with a valve cover should be used.

2. For the pipeline system of the catalytic cracking unit of the oil refining unit, a lifting rod needle valve can be used.

3. Needle valves In devices and piping systems with corrosive media such as acids and alkalis in chemical systems, it is advisable to use all-stainless steel needle valves made of austenitic stainless steel and with polytetrafluoroethylene as the valve seat sealing ring.

4. For pipeline systems or devices with high-temperature media in metallurgical systems, power systems, petrochemical installations, and urban heating systems, metal-to-metal sealing needle valves can be used.

5. When flow adjustment is required, a worm gear-driven, pneumatic or electric regulating needle valve with a V-shaped opening can be used.

6. For oil and natural gas transmission main lines that need to be cleaned and buried underground, choose needle valves with full diameter and fully welded structure; if they are buried on the ground, choose full diameter welded connections or flange connections. ball valve.

7. For refined oil transportation pipelines and storage equipment, flange-connected needle valves should be used.

8. For city gas and natural gas pipelines, needle valves with flange connection and internal thread connection should be used.

9. In the oxygen pipeline system in the metallurgical system, needle valves with flange connections that have undergone strict degreasing treatment should be used.

10. Needle valve consists of valve body, needle cone, packing and hand wheel.