User Guide

Technical Instructions Flowrite 599 Series Two-Way Valves
Document Number 155-184P25
July 23, 2008
Page 10 Siemens Building Technologies, Inc.
ELECTRONIC PNEUMATIC
Line Size (in)
1400
1200
1000
800
600
400
200
0
1600
250
200
150
100
50
25
0
1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
Differential Pressure (psi)
Differential Pressure (kPa)
Line Size (in)
1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
250
200
150
100
50
25
0
Differential Pressure (psi)
1400
1200
1000
800
600
400
200
0
1600
Differential Pressure (kPa)
VF0280R1
4-inch Pneumatic
8-inch Pneumatic
12-inch Pneumatic
SQX
EI/Mech Low Force
SKD
SKB
Rack & Pinion Valve
Line Size (in)
1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
Line Size (in)
1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
250
200
150
100
50
25
0
Differential Pressure (psi)
1400
1200
1000
800
600
400
200
0
1600
Differential Pressure (kPa)
250
200
150
100
50
25
0
Differential Pressure (psi)
1400
1200
1000
800
600
400
200
0
1600
Differential Pressure (kPa)
Figure 4. Close-off Pressures.
Operation
Figure 5 shows the normally open valve in
the open or full flow position and the
normally closed valve in the closed or zero
flow position. The actuator spring provides
the necessary force to hold the stem in the
raised or normal 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.