Data Sheet for Product

Technical Instructions Flowrite™ 8-inch Pneumatic Valve Actuator
Document Number 155-161P25
June 14, 2019
Page 4 Siemens Industry, Inc.
Spring Adjustment
With the actuator in an upright position and the stem visible as shown in Figure 2, use a
3/4-inch (.75 mm) open end wrench to turn the adjustment screw.
• Normally Open Valves: To increase the start to close pressure, turn the adjustment
screw from right to left. To decrease, turn the adjustment screw from left to right.
• Normally Closed Valves: To increase the start to open pressure, turn the adjustment
screw from right to left. To decrease, turn the adjustment screw from left to right.
NOTE: As the line pressure differential across the valve increases, the spring span
decreases.
Figure 2. Spring Adjustment.