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1. Oil, natural gas pipeline, the choice of a single gate or double gate of the flat gate valve. If you need to clean the pipeline, use a single gate or double gate with diversion hole Ming rod flat gate valve. 2. Oil product pipeline and storage equipment, the use of non-diversion hole single gate or double gate plate gate valve. 3. Oil and natural gas production wellhead device, the choice of dark rod floating valve seat with diversion hole single gate or double gate plate gate valve, mostly API16A standards, the pressure level of API2000, API3000, API5000, API10000, API15000, API20000. 4. With suspended particulate medium pipe, the choice of knife-type flat gate valve. 5. City gas pipeline, the choice of a single gate or double gate soft seal rod flat gate valve. 6. Urban water projects, the choice of single-gate or double gate without diversion Kong Ming-slab gate valve.