... , Chemicals & Petro-chemicals, Coal-mine, Metallurgy, Pharmacy, SMT, Fire-resistance, lab, Air driving, and so on... 1. Metallurgy: For anneal protection ... lifetime of molecular sieve. 5. National patent valve guarantees stable equipment operation. 6. Air tank ensures stable system air consumption. 7 ... needs. Contact us for more details. Nitrogen Machine/ N2 Gas Equipment