User Guide

Technical Instructions Flowrite EA 599 Series SKB/C/D 62UA Electronic Valve Actuator Advanced Features
Document Number 155-717
July 11, 2011
Page 6 Siemens Industry, Inc.
Valve Details,
Continued
;
;
;
;
EA0389R1
;
;
;
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
Figure 7. SKD Valve Parts.
Standard Operation
Figure 8. SKB/C Valve Stem Travel Indication.
EA0439R1
1
0
STROKE
4 20 mA
0 10 Vdc
0
1
0
1
0
1
0
1
EA0387R1
3/4 in.
(20mm)
Direct Acting
Figure 9. SKD Valve Stem Travel Indication.
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 actuator spring returns the valve to its
normal position.