Data Sheet for Product

Technical Instructions SKD Electronic Valve Actuator 3-Position (Floating) Control
Document No. 155-181P25
September 25, 2018
Page 4 Siemens Industry, Inc.
WARNING:
This product contains a spring under high compression. Do not
attempt to disassemble the actuator.
SKD Details
Figure 5. SKD Details.
Legend
1. Pressure cylinder
2. Piston
3. Oscillating pump
4. Return spring
5. Bypass valve
6. Valve stem retainer
7. Manual override knob
8. Position indicator
Operation
A 24 Vac control signal to Y1 causes the pressure cylinder to move toward the valve.
A 24 Vac control signal to Y2 causes the pressure cylinder to move toward the actuator.
The stroke travel is proportional to the length of time the signal is applied. The total time
for full stroke opening and closing is two minutes.
Figure 6. Spring Return.
Figure 7. Non-spring Return.
Spring return: When power is turned off or
in the event of a power failure, the actuator
spring returns the valve to its normal
position.
Fail-safe return time is 8 seconds.
Non-spring return: When power is turned
off or in the event of a power failure, the
actuator maintains its position.