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40 | Baker Hughes
Field Mounting and Complete Calibration,
Rotary Actuators
The following instructions are to be followed for mounting and calibration of the 4700P/4700E
and 4800P/4800E positioner. Define the proper valve action and positioner action. If the
positioner is not on the valve, see
Figure 19 on page 58 to mount positioner and cam coupling.
Once the positioner body is assembled on the valve and the coupling is on the valve shaft,
proceed to the proper section below.
Air to Open / Direct Acting Positioner
See Figure 18 (page 56) and Figure 19 (page 58).
1. Do not connect air supply or signal to the positioner. Valve is closed.
2.
Place lever S/A (3) to proper side (left or right) as designated by the appropriate cam
selection table for valve in question.
3. With valve closed, place cam holder (36) with Truarc ring (37) into cam coupling (34).
4.
Place the cam (26) onto the cam holder (36) so that the selected cam lobe is facing
forward and will rest on the cam follower. (See appropriate table for cam selection.) Secure
cam to cam holder with washer (27), lockwasher (51) and screw (28). Tighten the screw
(28) while holding the cam (26).
5. With the valve closed, place the desired cam lobe’s low signal line on the cam follower
(4A). With the low signal line resting on the cam follower, sight across the face of the cam
to the raised reference line on the positioner case and align. (Low signal line and reference
line.) Center cam between the two arms of the lever S/A (3), then tighten set screws (35) to
87 inch-lbs torque. (See Figure 18 on page 56 for cam mounting.)
6.
Connect air supply and signal to positioner. Connect positioner output to valve actuator.
Refer to connection diagram. Adjust signal to low end of signal (i.e., 3 psig for a 3-15 psig
range 4700P/4800P; 4 mA for 4-20 mA 4700E/4800E).
7.
Adjust zero and span. Refer to “Zero Adjustment”
and
“Span Adjustment” on page 37.
Air to Open / Reverse Acting Positioner
See Figure 18
.
1. Do not connect air supply or signal to the positioner. Valve is closed.
2.
Place lever S/A (3) to proper side (left or right) as designated by the appropriate cam
selection table for valve in question.
3.
Run an independent regulated air line to the valve actuator in place of positioner output
line. Slowly apply proper air pressure through the regulator to open the valve. (Handwheel
may be used to open the valve in place of regulated air line.) Align the travel indicator with
the open end of travel scale. Do not over travel.
4.
Place cam holder (36) with truarc ring (37) into cam coupling (34).
5. Place the cam (26) onto the cam holder (36) so that the selected cam lobe is facing
Summary of Contents for Masoneilan 4700P
Page 16: ...2021 Baker Hughes Company All rights reserved 16 Baker Hughes Figure 5 87 88 Actuator...
Page 30: ...2021 Baker Hughes Company All rights reserved 30 Baker Hughes Figure 12 FM Installation...
Page 32: ...2021 Baker Hughes Company All rights reserved 32 Baker Hughes Figure 14 ATEX Installation...
Page 64: ...2021 Baker Hughes Company All rights reserved 64 Baker Hughes NOTES...
