KEYSTONE PNEUMATIC QUARTER-TURN ACTUATOR FEATURES • Direct mounting to all Keystone butterfly valves and ball valves. • Valve connection compatible with Keystone (imperial and metric) and ISO 5211. • Double Rack and Pinion design nullifies side loads on the pinion shaft, minimizing bearing wear and extending life. • Optimized product flow with standard mounted travel stops for valve position adjustment in open and close position (+/- 5° at each end). • Anodized aluminium body with electrostatic powder coating (ESPC) finish provides durable protection against corrosive environments. • Double acting and spring return versions available for cost effective and safe operation. • Up to 12 individual springs offer flexible torque range for both ball as butterfly valves. • Pre-compressed spring design and anti-blowout drive pinion means safe maintenance and operation.