Technical Instructions SKD6xU Electronic Valve Actuators 24 Vac Proportional Control
Document Number 155-180P25
February 28, 2018
Page 4 Siemens Industry, Inc.
SKD Details
Figure 4. SKD6xU 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
The actuator accepts a 0 to 10 Vdc or a 4 to 20 mA control signal. The actuator
mounted on a valve, produces a stroke proportional to the input signal. When power is
turned off or in the event of a power failure, the SKD62U Actuator spring returns the
valve to its normal position, and the SKD60U Actuator fails in place.
Figure 5.
Figure 6.
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.
Non-spring return: When power is turned
off or in the event of a power failure, the
actuator maintains its position.
Figure 7. Valve Stem Travel Indication.
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