ZSQ pneumatic actuated piston-type shut-off valve receives the signal from the regulating instrument, the control process pipe and turn on or off the fluid flow channel switching. This product has the advantages of operating force body design, small flow resistance, rated flow coefficient, allowable pressure, and excellent sealing performance. Thus, it is widely used in petroleum, chemical, metallurgy, electric power, textile, and other industrial production process automatic control and remote control systems.