Technical Instructions
Document No. 155-507
April 5, 2012
Flowrite™ 599 Series
SAX Electronic Valve Actuator
Non-spring Return, 24 Vac,
3-Position Control
Siemens Industry, Inc.
Description
The Flowrite™ 599 Series SAX Non-spring Return (NSR), Electronic Valve Actuator
requires a 24 Vac supply and receives a 3-position control signal to control a valve.
This actuator is designed to work with Flowrite 599 Series 2-way and 3-way valves with
3/4-inch (20 mm) stroke.
Features
• 24 Vac/Vdc operating voltage
• Direct-coupled installation requires no special tools or adjustments
• Visual stroke indication
• Manual override
• Overload and stall protection
• Optional functions with auxiliary switches, potentiometer, and stem heater
• Maintenance-free
Application
These electronic actuators are designed to be used with Flowrite 599 Series valves
with 3/4-inch (20 mm) stroke in hot and chilled water and steam service applications in
closed loop HVAC systems. They are particularly recommended for installations
requiring quick response and good rangeability.
Product Number
SAX81.03U (Actuator Code 373)
Product
Replacements
Stroke Actuators SQX…
to SAX…
Replacement of SQX Series Actuators by SAX Series Actuators.
NOTE:
• When replacing actuators consider positioning force, and positioning times.
• Adjust the controller parameter "Running time" or "Positioning time", to ensure
stable control.
SQX.. SAX..
Pos. Time [s] Pos. Force [N] Pos. Time [s] Pos. force [N]
SQX82.. SQX82.00U 120 700
SQX82.03U 30 700
SAX81.03U 30 800
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