As the development of course of study of natural gas cop, the dosage of valve of natural gas cop is bigger and bigger, valve of natural gas cop and common valve differ somewhat. Specific have the following:

1, material

The natural gas that transports because of cop contains many vulcanization hydrogen before desulphurization (this is a kind poisonous and extremely caustic strong gas, it and iron reaction make vulcanization iron, can show a shape to flake, equipment of the machinery that wear corrode) . Although pass the natural gas that the craft such as desulphurization handles, still have the vulcanization hydrogen of remaining. Select material of reason cop valve should be chosen anticorrosive the material that fight sulfur.

2, leakage rate

Natural and tracheal net is built in urban brim mostly, move and manage unlike general plant, often the worker undertakes operating, safeguard and check. Cop of general city natural gas is in above of about a hundred kilometer, can patrol regularly only, examination, and sometimes cop needs to carry the district with complex case, the leakage of medium is broken may bring serious fire accident. Leave the cop with closer city especially, those who prevent valve outside leakage appears particularly important.

The leakage rate requirement of natural gas valve is very strict, bury the ground and more important valve to use structure of type of complete solder of body of a powerful person normally. To assure the sealed function of cop valve, the requirement is sealed deputy have be able to bear or endure admirably corrode sex, wearability, reach flexibility from embellish sex. In recent years the development of high polymer material is cop valve the choice of sealed material offerred wide select material world, if get together balata of 4 fluorine ethylene, nylon, fourth nitrile (NBR) , special synthetic rubber (VITON) .

3, use an occasion

Once cop is thrown move, do not allow to stop to move inside a few years, the time that run grows better more, unlike generalization factory or refinery, have overhaul period. The natural gas that cop transports is facing a large number of users of whole town, dweller, enterprise, factory waits, it is the enterprise user of raw material with natural gas especially, not moment of be patient of is discontinuous. Once be out of order,series connection is in charge of cop valve that go up, consequence is unimaginable. Because of this cop valve main and sealed fragile if the spare parts such as valve base asks,life grows. Service life of valve of conduit of general mainstay line asks 30 years above.

4, actuating device

Because cop carries pressure tall, caliber time of big, switch is fast, cop valve needs to use big torque actuating device. Be like dynamoelectric or linkage of fluid of — of pneumatic device, gas or device of linkage of electric — fluid. Actuating device has explosion proof demand even, requirement EExdIIBT4, defend grade IP68. Because of managing control personnel is commonly inside the station or central control room, when once produce burst,waiting for grave accident because of this requirement conduit, cop valve can be cut off automatically. Cop valve asks operation force is small, when change of temperature, outside force produces an effect, can realize accurate operation. Stop a powerful person closely agog especially, must can be in condition of a standard-sized sheet for a long time, when necessary rapid closedown pipeline. In the meantime, of requirement valve shut the position and open degree of indicator to understand well and truly, easily, satisfy appropriate switch rate.
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