Page
34
Actuator Installation and Adjustment
Flow (Speed) Control Valves
Pneumatic actuators are provided with the flow control valves. The flow control valves connected
to the pneumatic actuators are used to regulate the speed of the butterfly valve operation.
1. Shut off the air supply.
2. Remove the tubing from the closed port of the pneumatic actuator. Refer to
Pneumatic
Actuator Tubing Connections
to determine which port is the closed port. Connect it to the
air supply in on the air switch.
3. Remove the tubing from the open port of the pneumatic actuator.
4. Connect the tubing from the air switch to both ports of the pneumatic actuator.
5. Open the air supply.
6. Move the switch back and forth to check the open and closed operation of the valve.
7. If necessary, adjust the valves:
a. Loosen the lock nut, and then close the control valves by turning them clockwise.
b. Open the valves 1.5 turns each by turning them counterclockwise.
c. If necessary, adjust the valves to allow for smooth operation:
Figure 13: Flow Control Valves
NOTE
While facin g the pneumatic actuator with flow con trol valves, the air in
on right open s the valve; the air in on left closes the valve. See Figure 9.
T he con trol valve on the CLOSED PORT regulates the butterf
ly valve’s
opening speed.
T he con trol valve on the OPEN POR T regulates the b utterfly valve’s
closing speed .
Closing the valves slows the speed of the b utterfly valve.
Openin g the valves in creases the speed of the b utterfly valve.
I t is recommen ded that the actuator b e moun ted parallel with the piping.
Air supply in
To flow
control
valves
Summary of Contents for DEFENDER SP-27-48-487
Page 14: ...Page 14 General Installation Schematic ...
Page 15: ...Page 15 DIMENSIONAL REFERENCE Standard Defender ...
Page 16: ...Page 16 Assero Defender Reduced Height Defender ...
Page 17: ...Page 17 Reduced Height Defender ...
Page 77: ...Page 77 APPENDIX ...
Page 78: ...Page 78 Electrical Schematic ...
Page 79: ...Page 79 Head Loss Curve ...