Technical Instructions
Flowrite 599 Series Two-Way Valves, 1/2 to 2-Inch, Bronze Body, ANSI 250
Document Number 155-184P25
May 2, 2016
Page 10
Siemens Industry, Inc.
ELECTRONIC
PNEUMATIC
Figure 4. Close-off Pressures.
Operation
Figure 5 shows the normally open valve in
the open position and the normally closed
valve in the closed or zero flow position.
In the event of power failure, a spring
return actuator returns the valve to its
normal position. Non-spring return
actuators will hold the last commanded
position. See the
Technical Instructions
of
the various actuators for additional
information.
Figure 5.
