Adjustment Procedure

Valves vary by the amount of rotation required to cover the full range of regulation. Most valves will have a range of regulation. Most valves will have a range from 0° to 90° or 0° to 120°. The maximum travel that can be realized from a 90° actuator and mechanical linkage arrangement is about 120°. The amount of travel to be used is dependent upon the required turn-down ratio (flow rates) between high-fire and low-fire and the flow characteristics of the particular valve.
 

For initial start-up: (use factory set points)

Adjustment requirements cannot be finally established until after the burner is fired. The valve should work from a mid-open to a closed position when located in the return line when going from low-fire to high-fire.

To adjust amount of travel, loosen base of ball-joint connector located in slotted actuator arm and reposition to desired setting, then re-tighten connector.