The needle valve is a valve that can be adjusted accurately. It has a wide range of uses, such as the cutting distance for flame cutting. The knob for adjusting the flame temperature is the needle valve. Instrument needle valve is an important part of the instrument measurement pipeline system. It mainly includes stop valves and ball valves. Its function is to open or cut off the pipeline passage. The valve core of the needle valve is a very pointed cone, which is inserted into the valve seat like a needle, hence the name.

Needle valve features:

1. The coaxial design of the cylinder, valve needle and nozzle ensures smooth and stable movement of the valve needle.

2. There is no cam or lever mechanism, and the cylinder and nozzle are embedded in the template hole, so the overall structure is compact.

3. The connection between the parts is simple and easy to assemble and replace.

4. The valve needle is made of special materials, and its surface is treated with titanium nitride, making it durable.

5. The inner surface of the flow channel has a smooth transition and no material dead spots, which is convenient for changing materials and colors.

6. The system can be suitable for the application of different engineering plastics.

Needle valve types:

(1) Low temperature needle valve: suitable for piping systems and devices with low temperature media.

(2) Lifting rod needle valve: suitable for the pipeline system of the catalytic cracking unit of the oil refining unit.

(3) All stainless steel needle valve: suitable for devices and piping systems with corrosive media such as acid and alkali in chemical systems.

(4) Metal-to-metal sealing needle valve: suitable for piping systems or devices with high-temperature media in metallurgical systems, power systems, petrochemical plants, and urban heating systems.

(5) Adjusting needle valve: suitable for when flow adjustment is required.

(6) Full-bore welded connection or flange-connected ball valves: For main oil and natural gas transmission lines, pipelines that need to be cleaned, and need to be buried underground, select needle valves with full-bore, fully welded structures; if they are buried on the ground, select full-bore welded or flange-connected ball valves.

(7) Flange-connected needle valve: suitable for transportation pipelines and storage equipment of refined oil.

(8) Needle valves with flange connection and internal thread connection: on city gas and natural gas pipelines.

(9) Flange-connected needle valve: in the oxygen pipeline system in the metallurgical system.

Needle valve model:

The valve core of the needle valve is a very pointed cone, which is inserted into the valve seat like a needle, hence the name. Needle valves can withstand greater pressure than other types of valves and have good sealing performance, so they are generally used for sealing gas or liquid media with smaller flow rates and higher pressures. Different types of needle valves have different models. The following are common models on the market:

● J13W high pressure internal thread needle valve

● J23W chromium-nickel stainless steel welded needle valve

● J29H needle type instrument valve

● Stainless steel needle instrument valve

● JJY1 ferrule needle valve

● J13W type needle valve

● J24W angle type high pressure needle valve

Needle valve uses:

Needle valve is an important part of the instrument measurement pipeline system, mainly including stop valve and ball valve. Its function is to open or cut off the pipeline passage. The needle valve has the advantages of easy installation and disassembly, tight connection, good fire protection, explosion-proof and pressure resistance, and good sealing performance. It is an advanced connection valve in power stations, oil refining, chemical equipment and instrument measurement pipelines. The needle valve has good sealing and long service life. Even if the sealing surface is damaged, only the wearing parts need to be replaced and it can continue to be used.

Needle valve selection tips:

1. For pipeline systems and devices of low-temperature media, low-temperature needle valves with valve covers 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. For devices and piping systems with corrosive media such as acids and alkalis in chemical systems, all-stainless steel needle valves made of austenitic stainless steel and polytetrafluoroethylene as valve seat seals should be used.

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 main oil and natural gas transmission lines that need to be cleaned and buried underground, select full-bore, fully welded structure needle valves; for those buried above ground, select full-bore welded or flange-connected ball valves.

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.