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Pneumatic diaphragm double seat control valve adopts double-guide structure, the body structure is compact, the fluid channel is S-streamlined, the pressure loss is small and the flow flux is large, the adjustable range is wide, the flow characteristic precision is high.Due to the top and bottom of the spool guide, it has the characteristics of anti-seismic and wear resistance.The control valve is equipped with multi-spring film actuator, which has small structure and large output force, and is more suitable for good stability, high reliability, high pressure, high pressure difference and good control under the process conditions of the fluid medium containing silt and easy to block.