Document No. 129-125
Installation Instructions
Rev. 5, June, 2000
Siemens Building Technologies, Inc.
Page 3 of 5
Installation, Continued
Table 1. Spring Selection for Adjustable Stroke
of the No. 6 Damper Actuator.
Feedback Spring
Actuator
Stroke
Color
Nominal
Max
Adjusting
Screw
3-1/4 to 4
(82 to 102)
Blue
4
(102)
4-1/4
(108)
4-1/2 (114)
long
2-29/32 to
3-1/4
(74 to 82)
Cadmium
3
(76)
3-1/4
(82)
1-3/4 (44)
long
Dimensions in inches (millimeters).
Calculating the span setting
1.
Identify the stem/stroke travel from
Tables 1, 2,
3, 5, or 6.
2.
If the stem travel matches a nominal spring
travel listed in
Table 4
there is no need to
calculate a new span setting.
3.
If the stem travel does not match a nominal
spring travel listed in
Table 4
, chose the
spring(s) whose maximum allowable travel is
equal to or greater than the actual stem travel.
4.
Calculate the span setting with the following
formula:
Formula for Span Setting
Nominal spring travel
Span
setting
=
Desired
span
Actuator stroke
Example:
Determine the span setting for a valve
having a desired span of 5 psig and
5/16-inch stroke.
Select a spring with a maximum allowable range
equal to or larger that the stroke. Use the 1/4-inch
spring with a 3/8-inch maximum allowable travel
range. See
Table 4
.
0.25
Span
setting
= 5 x
0.312
= 4
Set the span adjustment tab to line 4 on the
feedback arm to provide a 5 psig span for this valve.
Table 2. Stem Travel for VF 599 Valve Bodies.
Stem Travel in Inches (mm)
Line size
in Inches
(mm)
8-inch
Actuator
12-inch
Actuator
1/2 through 2
(15 though 50)
3/4 (20)
–
2-1/2 (65)
3/4 (20)
3/4 (20)
3 (80)
3/4 (20)
3/4 (20)
4 (100)
–
1-1/2 (40)
5 (125)
–
1-1/2 (40)
6 (150)
–
1-1/2 (40)
Table 3. Stem Travel Listed by Valve Type.
Flowrite™ Valve Stem Travel in Inches (mm)
Line Size
Inches
(mm)
VP 591
Single Seat
VP 591
Double Seat
VP 591
WM
VP 593
Single Seat
VP 593
Double Seat
VP 593
WM
1/2 (13)
3/8 (9.5)
–
1/8 (3.2)
–
–
–
3/4 (19)
3/4 (19)
–
3/16 (4.8)
–
–
–
1 (25)
3/4 (19)
3/16 (4.8)
1/4 (6.4)
–
–
–
1-1/4 (32)
1 (25)
1/4 (6.4)
5/16 (7.9)
–
–
–
1-1/2 (38)
1 (25)
1/4 (6.4)
5/16 (7.9)
–
–
–
2 (51)
1 (25)
3/8 (9.5) N.O.
5/16 (7.9) N.C.
5/16 (7.9)
–
–
–
2-1/2 (64)
5/8 (16)
3/8 (9.5) N.O.
5/16 (7.9) N.C.
5/8 (16)
1-1/8 (29)
3/4 (19)
1 (25)
3 (76)
3/4 (19)
9/16 (14)
3/4 (19)
1-1/8 (29)
3/4 (19)
1 (25)
4 (102)
1 (25)
9/16 (14)
1 (25)
1-1/4 (32)
1-1/8
1-3/8 (35)
5 (127)
–
–
–
1-1/2 (38)
1-1/4 (32)
1-3/8 (35)
6 (152)
–
–
–
1-1/2 (38)
1-1/4 (32)
1-3/8 (35)
8 (203)
–
–
–
–
1-1/2 (38)
–
