Installation Instructions

Document No. 129-173
Installation Instructions
Rev. 2, August, 2000
Page 2 of 3 Siemens Building Technologies, Inc.
Installation, Continued
5. Position the spring arm (7) on the valve stem so
the hole for the adjusting screw (3) is in line with
the spring guide. Lock in position between the
two hex nuts on the valve stem.
6. Select the proper feedback spring(s).
a. Find the stem travel from Table 2, or
measure the stem travel.
b. If the stem travel exactly matches the
nominal spring travel range in Table 3, read
across the row to find the part number of the
spring(s) you need.
c. If the stem travel does not match a nominal
spring travel range in Table 2, select the
spring which has a nominal value less than
the stem travel and a maximum allowable
greater than the stem travel. Read across
the row to find the part number of the
spring(s) you need.
d. Remove the spring(s) from the spring card.
Table 2. Stem Travel of 12-inch Flowrite Manufactured
Before March 1978.
Flowrite Valve Stem Travel
Inches (mm)
Line Size
Inches (mm)
VF591 CD VF591 WM VF591 DS
2-1/2 (64) 5/8 (16) 5/8 (16) 3/8 (9.5) N.O.
5/16 (7.9) N.C.
3 (76) 3/4 (19) 3/4 (19) 9/16 (14)
4 (102) 1 (25) 1 (25) 9/16 (14)
5 (127) 1-1/4 (32) 1-1/4 (32) 314 (19)
6 (152) 1-1/2 (38) 1-3/8 (35) 1 (25)
8 (203) – – 1-1/4 (32)
Table 3. Spring Selection.
Spring Travel Range Recommended Springs
Nominal
Inches
(mm)
Maximum
Allowable
Inches (mm)
Part
Number
Size and Color
1/4 (6.4) 3/8 (9.5) 147-289 Small Cadmium Plate
1/2 (13) 3/4 (19) (2) 147-289 Small Cadmium Plate
3/4 (19) 1 (25) 147-290 Small Red
1 (25) 1-1/4 (32) 147-291 Long Green
1-1/4 (32) 1-5/8 (41) 147-289 plus
147-291
Small Cadmium Plate
plus Long Green
7. Connect the feedback spring(s) (2) between the
spring guide and the adjusting screw (3). If more
than one feedback spring is required, connect
them in a series end to end.
8. Thread one wing nut (4), the lock washer (5),
and the flat washer (6) onto the adjusting screw.
See Figure 2.
Figure 2. Attaching the Adjusting Screw to the
Spring Arm.
9. Slide the adjusting screw through the spring
arm. Thread the remaining wing nut onto the
adjusting screw. Tighten the wing nuts so that
there is no slack in the spring, but do not stretch
the spring.
NOTE: Adjust the spring arm so that the
adjusting screw and the feedback
spring are parallel to the valve stem.
10. Attach the connector (9) to the actuator. See
Figure 1.
11. Make pneumatic piping connections to the
actuator and relay. The "S" Port is the air supply
port. The "M" Port goes to the connector on the
actuator. The "T" Port is the signal from the
controller. See Figure 3.
Figure 3. Positioning Relay Ports.
Discontinued