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Installation, Continued
Table 1. Spring Selection for Adjustable Stroke
of the No. 6 Damper Actuator.
Actuator
Feedback Spring
Stroke
Color
3-1/4 to 4
Blue
(82 to 102)
2-29/32 to
Cadmium
3-1/4
(74 to 82)
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:
Line Size
Inches
VP 591
(mm)
Single Seat
1/2 (13)
3/8 (9.5)
3/4 (19)
3/4 (19)
1 (25)
3/4 (19)
1-1/4 (32)
1 (25)
1-1/2 (38)
1 (25)
2 (51)
1 (25)
2-1/2 (64)
5/8 (16)
3 (76)
3/4 (19)
4 (102)
1 (25)
5 (127)
–
6 (152)
–
8 (203)
–
Siemens Building Technologies, Inc.
Adjusting
Screw
Nominal
Max
4
4-1/4
4-1/2 (114)
(102)
(108)
long
3
3-1/4
1-3/4 (44)
(76)
(82)
long
Table 3. Stem Travel Listed by Valve Type.
Flowrite™ Valve Stem Travel in Inches (mm)
VP 591
VP 591
Double Seat
–
1/8 (3.2)
–
3/16 (4.8)
3/16 (4.8)
1/4 (6.4)
1/4 (6.4)
5/16 (7.9)
1/4 (6.4)
5/16 (7.9)
3/8 (9.5) N.O.
5/16 (7.9)
5/16 (7.9) N.C.
3/8 (9.5) N.O.
5/8 (16)
5/16 (7.9) N.C.
9/16 (14)
3/4 (19)
9/16 (14)
1 (25)
–
–
–
–
–
–
Formula for Span Setting
Span
=
setting
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 .
Span
= 5 x
setting
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.
Line size
in Inches
(mm)
1/2 through 2
(15 though 50)
2-1/2 (65)
3 (80)
4 (100)
5 (125)
6 (150)
VP 593
WM
Single Seat
Double Seat
–
–
–
–
–
–
–
–
–
–
–
–
1-1/8 (29)
3/4 (19)
1-1/8 (29)
3/4 (19)
1-1/4 (32)
1-1/8
1-1/2 (38)
1-1/4 (32)
1-1/2 (38)
1-1/4 (32)
–
1-1/2 (38)
Document No. 129-125
Installation Instructions
Rev. 5, June, 2000
Nominal spring travel
Desired
span
Actuator stroke
0.25
= 4
0.312
Stem Travel in Inches (mm)
8-inch
Actuator
3/4 (20)
3/4 (20)
3/4 (20)
–
–
–
VP 593
VP 593
WM
–
–
–
–
–
–
1 (25)
1 (25)
1-3/8 (35)
1-3/8 (35)
1-3/8 (35)
–
12-inch
Actuator
–
3/4 (20)
3/4 (20)
1-1/2 (40)
1-1/2 (40)
1-1/2 (40)
Page 3 of 5
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