In the gas industry, valves are the core equipment for controlling gas transportation, storage, distribution and safe handling, and must meet special requirements such as high pressure, low temperature, leakage prevention, and corrosion resistance.

 

Applications of valves in the gas industry

 

I. Natural gas transportation and storage

- Long-distance pipelines: high-pressure gas transportation

- LNG storage tanks

- Gas stations: CNG/LNG filling equipment

 

II. Industrial gases (oxygen, nitrogen, hydrogen, etc.)

- Air separation equipment: low-temperature oxygen/nitrogen control

- Hydrogen storage and transportation

- High-purity gas

 

III. Toxic and harmful gases (chlorine, hydrogen sulfide, etc.)

- Chemical production

- Waste gas treatment

 

IV. Special gases (inert gases, electronic special gases)

- Semiconductor manufacturing

- Laboratory gas supply

 

Special technical requirements

 

I. Anti-leakage design

- Bellows seal: avoid packing leakage, suitable for highly toxic/radioactive gases.

- Double Block and Bleed (DBB): Expel residual gas in the cavity when the valve is closed (such as natural gas pipeline).

 

II. Anti-hydrogen embrittlement treatment

- Low-carbon austenitic stainless steel (316L) or nickel-based alloy is selected in hydrogen environment to avoid hydrogen atom penetration and material embrittlement.

 

III. Low temperature adaptability

- Material toughness: -196℃ liquid nitrogen valves must use LCB low-temperature carbon steel or 304L stainless steel.

- Structural design: Extended valve cover to prevent packing from freezing, and extended valve stem design.

 

IV. Clean and pollution-free

- Surface treatment: Electrolytic polishing (Ra≤0.4μm) to avoid particle contamination (semiconductor industry).

- Oil and grease-free: Oxygen valves must be strictly degreased to prevent the risk of explosion.