The ball checks act as an internal safety shut-off

With an adjustable range of 1

Tamper Resistance: Equipped with tamper-resistant bonnet screws to prevent unauthorized field adjustments to the set point

What causes a limit switch to "trip" if there isn't a fire

Siemens Building Technology 331-4310 Actuator 322838-754 The ball checks act asThe Siemens 331 4310 is a heavy duty pneumatic damper actuator engineered for precise proportional control in commercial HVAC systems. This No. 4 actuator features a 3 7 psi spring range and a 2 3 8 inch stroke, making it a critical component for modulating dampers and air valves in both legacy and modern building automation systems. Designed with a rugged metal housing, it handles the mechanical demands of air handling units where consistent torque