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The pneumatic diaphragm control valve has the advantages of low height, light weight, simple equipment, compact valve body, smooth flow passage and large flow coefficient. The fine and small single seat pneumatic control valve has the characteristics of stable operation, reliable action characteristics, small seat leakage, accurate flow characteristics, wide adjustable range, etc. It will achieve high quality control effect in wide application with its unique advantages. The products are standard type, adjustable cut-off type, bellows seal type, jacket heat preservation type and other varieties. Suitable for liquid temperature range from - 200 ℃ to + 560 ℃.