The GUQ series pneumatic vacuum (pressure) ball valve is suitable for connecting or cutting off the medium flow in pipelines in vacuum systems. This valve is powered by compressed air,. By controlling the pneumatic components to change the direction of the gas path, the mechanical transmission of the piston rack and gear is pushed, and the angular stroke output torque is used to drive the ball valve for opening and closing motion. The valve is a straight through type, sealed by a spherical surface, which can be used in both vacuum and low-pressure conditions, and can be installed in any position. The cylinders are divided into double acting and single acting (spring return), and can be equipped with feedback signal devices and electrical valve positioners. The applicable working medium is gas or liquid with acid or alkaline content.