Page 2
OPERATION
The Positioner has a usual pressure range of 10 to 60 psi (0.7
to 4.1 bar) within a temperature range of -40°F to 165°F (-40°C
to 74°C). Pressure is supplied by a pressure control valve such
as the AVENTICS CONTROLAIR
®
Valve or FLEXAIR
®
Valve.
The pressure imposed on the diaphragm (6) is proportional to
the handle travel of the control valve. The movement of the
positioner operating lever (14) is also proportional to this
movement. Finally, the position of the controlled device is
proportional to the handle travel of the control valve.
When supply pressure is reduced, the force of the spring (8)
against the push rod and spring seat assembly (7) returns the
lever to its new position corresponding to the value of air
pressure remaining. Supply pressure of 10 psi (0.7 bar) usually
provides idle position with 60 psi (4.1 bar) usually providing full
travel or full fuel position.
MAINTENANCE
By removing only the cover (5), the diaphragm (6) can be
quickly replaced without removing the positioner from its
mounting or disturbing the piping connection.
When complete disassembly is required, clean all metal parts
with a nonflammable solvent and wash all rubber parts with
soap and water. Rinse thoroughly and blow dry with a low-
pressure air jet. Replace those parts which are damaged or
worn, giving particular attention to the condition of the
diaphragm (6).
Reassemble the positioner using the exploded and assembly
views as reference. No special tools are required. To maintain
the same preload on the spring (8), shims (9 and 10) must be
included. Apply Number 107 Lubriplate, or its equivalent, to all
grease fittings.
CONVERSION AND REPAIR KITS
Conversion Kits are available for A-2-H Actuator Positioners of previous designs. If the body castings are still in good condition,
these positioners should be converted to the current design at the earliest convenient maintenance period.
KIT Part Number R431005741 (Old Part Number P -061277-00000)
Will convert all A-2-H Actuator Positioners using lever Part Number 521100, prior to those listed in the Identity Schedule below.
IDENTITY SCHEDULE
PRESSURE
RANGE
WITH ACCESSORIES PART
LESS ACCESSORIES
ACCY. KIT
New P/N
Old P/N
New P/N
Old P/N
New P/N
Old P/N
3-15
R431005217 P -059718-00011 R431005216 P -059718-00010 R431004143 P -057415-00000
10-60
R431004010 P -057159-00011 R431004009 P -057159-00010 R431004143 P -057415-00000
10-60
R431004011 P -057159-00012
--
--
R431004145 P -057416-00000
10-60
--
--
*R431005745 *P -061289-00010
--
--
15-80
R431004529 P -058430-00011 R431004528 P -058430-00010 R431004143 P -057415-00000
35-90
R431003984 P -057086-00011 R431003983 P -057086-00010 R431004143 P -057415-00000
REF. QTY
DESCRIPTION
5
1 COVER, Diaphragm
6
1 DIAPHRAGM
7
1 PUSH ROD and SPRING SEAT ASSEMBLY, Complete
REF. QTY
DESCRIPTION
1
1 NUT, #10-32 Stop
2
1 BOLT, 1/4" Pivot
3
1 BEARING, 1/4" ID.
5
1 COVER, Diaphragm
6
1 DIAPHRAGM
7
1 PUSH ROD and SPRING SEAT ASSEMBLY, Complete
11
1 NUT, 1/4"-28 Stop
12
1 BOLT, 5/16" Pivot
13
1 BEARING, 5/16" ID.
14
1 LEVER
KIT PART NUMBER R431005999 (Old Part Number –062065-00000)
Will convert A-2-H Actuator Positioners listed as “Obsolete” in the Identity Schedule below to current design.
* Uses body (ref. 17a, page 3) with drain hole for mounting Positioner with lever in top position.
PART NO.
OLD PART NO.
DESCRIPTION
R431005743 P -061278-00000 Repair kit - minor kit (includes diaphragm & bearings, ref. items 3, 6 & 13)
R431006212 P -063286-00000 Repair kit - major kit (includes minor kit (above) plus ref. items 1, 2, 11, 12 and 14.
