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Standard low-temperature ball valve 1, iron and copper ball valve Standard No.: GB/T15185-1994 2, for industrial use low ball Standard No.: NF/E29-354-2003 3, ball valve product quality grading Standard No.: JC/T783-2004 4, flange, and welded steel ball valves Standard No.: GB/T12237-1989 5, glass fiber reinforced modified phenolic ball Standard No.: JB/T8861-2004 The role of low-temperature ball valve Ball valve is mainly used to cut off the pipeline, distribution, and change the flow direction of medium, designed V-shaped opening of the valve also has a good flow regulation function. Principles of low temperature ball valve Evolved from the faucet valve, its opening and closing pieces, as a sphere, using the sphere around the axis of rotation 90o stem to achieve the purpose of opening and closing. Characteristics of low temperature ball valve 1, applies to the regular operation, open and close quickly, light. 2, fluid resistance. 3, simple structure, relatively small size, light weight, ease of maintenance. 4, good sealing performance 5, without limitation mounting direction, the flow medium can be arbitrary.