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Detailed analysis of the working principle of external thread needle valve
Date: 2025-11-16Read: 16
External thread needle valve is a commonly used flow control device in pipeline systems, widely used in various industrial fields, especially in systems that require precise adjustment of flow or pressure. Its unique design can provide high-precision flow control, suitable for pipelines with high pressure, high temperature, or special media.
External thread needle valveWorking principle:
1. Opening and closing: When the needle rod is rotated to the fully open position, the hole of the valve seat will be fully exposed, and fluid can flow smoothly through the pipeline. When the needle shaft rotates to the fully closed position, the needle will seal the valve seat, preventing fluid flow.
2. Flow regulation: Precise regulation is achieved by rotating the needle bar. The rotation of the needle rod can gradually change the gap between its tip and the valve seat, thereby accurately controlling the fluid flow rate. Due to the fact that the needle rod of a needle valve is usually designed to be long and very fine, even small adjustments can change the flow rate and achieve very precise control effects.
3. Fluid direction: It is usually a one-way flow, that is, the fluid can only pass through the valve in one direction, which is also an important reason why it is widely used in flow control.
Application fields:
1. Petrochemical industry: In the petroleum and chemical industries, needle valves are commonly used for precise flow control and pressure regulation, especially in high-temperature and high-pressure environments, to ensure stable flow control.
2. Energy industry: Used for fluid regulation and pressure control in pipeline systems, especially in situations where tight flow control is required, in energy industries such as electricity and natural gas.
3. Water treatment: In sewage treatment and water plant systems, water flow can be precisely controlled to ensure precise regulation of the water treatment process.
4. Laboratory: It is an ideal flow control tool in laboratory environments, especially for precise control of gas and liquid flow rates.
5. Pharmaceutical industry: In the pharmaceutical industry, it is widely used for liquid flow and pressure control in drug production processes, especially in processes that require high-precision regulation.
Advantages of external thread needle valve:
1. Precise flow control: capable of accurately adjusting flow, especially suitable for situations that require subtle adjustments.
2. High reliability: Due to the design of the external thread connection, the installation and disassembly of the valve are very convenient, and the sealing is good, which can prevent leakage.
3. Strong adaptability: Suitable for various pipeline systems, capable of stable operation under high temperature, high pressure, and various medium conditions.
4. Strong durability: Made of corrosion-resistant and wear-resistant materials, it has a long service life.
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