Needle type pneumatic valve material selection of the standard

in general, the needle type pneumatic valve material shall be according to the parameters and material selection of performance according to this standard, and shall comply with the provisions of the relevant product standards. Also can choose the performance is not lower than the provisions of this standard or for other material purchase contract agreed upon.
and special circumstances needle type pneumatic valve technical requirement is as follows:
. Grey cast iron pin type pneumatic valve
used for nominal pressure pN or less. MPa, the temperature was minus ~ ℃ water, steam, air, gas and oil medium such as gray cast iron is made of the pneumatic valve.
。 Malleable iron needle type pneumatic valve
used for nominal pressure pN or less. MPa, the temperature was minus ~ ℃ medium such as air, steam, water and oil of malleable iron pneumatic valves.
。 Ductile cast iron needle type pneumatic valve
used for nominal pressure pN or less. MPa, the temperature was minus ~ ℃ medium such as air, steam, water and oil of ductile cast iron pneumatic valves.
。 Copper and gold needle type pneumatic valve
used for nominal pressure pN or less. MPa water, sea water, oxygen, air, oil, such as medium, and the temperature is - ~ ℃ steam medium copper and gold pneumatic valves.
。 Carbon steel needle type pneumatic valve
used for nominal pressure pN or less. MPa, the temperature was minus ~ ℃ water, steam, air, hydrogen, ammonia, nitrogen and petroleum products such as medium carbon steel pneumatic valves.
。 High temperature steel needle type pneumatic valve
used for nominal pressure pN or less. The MPa, the temperature is less than or equal to ℃ steam and oil products such as medium of high temperature steel pneumatic valve.
。
low temperature steel needle type pneumatic valve used for nominal pressure pN or less. MPa, the temperature is higher than or equal to - ℃ of ethylene, propylene, liquid, gas, liquid nitrogen medium low temperature steel pneumatic valves, etc.
。 Acid-proof stainless steel needle type pneumatic valve
used for nominal pressure pN or less. MPa, the temperature is lower than or equal to ℃ of the media such as nitric acid, acetic acid, acid-proof stainless steel pneumatic valves.