Powers 593 Series Flowrite II Heavy Duty Bronze Globe Control Valves - Manual (Page 2)

TI147-POS Page 2
INSTALLATION
Before starting, make sure the positioner stroke range is
appropriate for your valve. See Table 3 on back page.
Mounting
1. Attach positioner take-off plate (16) to valve stem and
tighten stem lock nuts. Angle part of take-off plate
should be pointing up for N.C. valves with 46 actuator
and pointing down for N.O. valves with 46 actuator.
For 75 in2 actuator the take off plate always faces
down.
2. Orientate positioner for N.O. or N.C. action per Figure 1,
2, or 3. Loosely bolt positioner black slot to actuator
mounting rib. Do Not Tighten.
NOTE: Be sure take-off pin assembly (2, 3, 4) is resting
on angle of take-off plate.
3. Use separate air source to stroke valve to mid-position.
4. Slide positioner up or down rib until feedback lever is
level when valve is at midstroke.
5. Tighten mounting bolt.
6. Remove air from actuator.
Air Piping
NOTE: Use only dry and filtered instrument air.
7. Pipe 1/8" NPT positioner output to actuator.
7a. Plug or install gauge in second 1/8 NPT port.
8. Connect control signal to 1/4” NPT “signal” port.
9. Connect instrument quality air supply to 1/4” NPT “
supply” port. Do not exceed 50 PSI Supply with 46
actuator, 30 PSI with 75 actuator.
Span Adjustment
10. Find the proper take-off pin setting in Table 3.
11. Move take-off pin assembly to proper setting.
a. Moving pin closer to housing narrows throttling
span.
b. Moving pin away from housing increases throttling
span.
Zero Adjustment
11. Set signal input to positioner at 3 psi.
12. Adjust zero screw until output gauge reads zero.
13. Set signal input to positioner at 3.2 psi.
14. Readjust zero screw until valve begins to move. (A seat
leak test is the most accurate way to determine valve
starting point.)
15. Return signal to 3 psi. Valve should return to fully closed
position. (Again, this is best determined by a seat leak
test.)
16. Increase signal to 15 psi and adjust take off pin (22) to
full open position as necessary.
SPECIAL FUNCTIONS
Split Range
Split range calibration is used to provide full valve stroke with
a partial (3-9 or 9-15) control signal. Two valves are
sequenced by using split ranging. Heating processes with
large load changes benifit from split ranging two small valves
instead of using one large valve.
Heat-cool processes can be controlled with one signal by
split ranging the heating and cooling valves.
Select the appropriate split range positioner from Table 3.
Factory mounted and calibrated split range positioners can
be specified by code “L” (3-9) or code “U” (9-15) in the
Flowrite Order Code “Spring Range” field.
Note: The two unmarked 1/8” NPT ports are output to the
actuator. Plug or install a gauge in the unused 1/8” NPT port.
The 1/4” NPT port marked “signal” is the input signal to the
positioner from an I/P or controller. The 1/4” NPT port
marked “supply” is connected to instrument quality air sup-
ply (50 PSI max for 46 actuator, 30 PSI max for 75 actuator).