| http://www.w3.org/ns/prov#value | - These industries including natural gas, oil, chemicals, metallurgy, paper making, electrical power, mining industry, printing, biological pharmacy, daily chemicals, food and beverage, water treatment and air treatment .Series pneumatic valves structure feature:Pneumatic actuator: adopt new type series GT pattern pneumatic actuator, have double action type and single action type drive (spring reset
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