Q641F series pneumatic O-regulating valve is a corner for the 90 ° rotation type valves, excellent sealing performance, flow coefficient, flow resistance coefficient is small, simple structure, long service life and easy maintenance. Equipped with the implementing agency is the introduction of foreign advanced technology to produce the Bray series of cylinder-type implementing agencies, the role of valve sub-single-and dual-role of the two kinds of models. Products are widely used in chemical, petroleum, textile, electricity, food pharmaceutical, refrigeration, paper industry, system control.