Graco 311595C Instructions - Parts Manual page 4

Repair
Repair
Back Pressure Regulator Repair
1. Relieve all system fluid pressure.
2. Shut off air to the back pressure regulator.
3. See F . 2. Unscrew the diaphragm housing (2)
IG
from the back pressure regulator (1).
5
Apply thread lubricant.
2
5
1
5
6
F . 2. Separate Diaphragm Housing from Back
IG
Pressure Regulator
4. See F . 3. Remove the screws (111) and adapter
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(110) from the back pressure regulator housing.
5. Inspect the valve seat (103). If damaged, remove
the seat and gasket (102). Install a new gasket
(102) and torque the new seat to 15-20 ft-lb (21-27
N•m).
6. See F . 3. Install the diaphragm assembly.
IG
7. Install the adapter (110) and screws (111). Torque
the screws to 120-130 in-lb (13.6-14.7 N•m) oppo-
sitely and in sequence, three times.
4
8. Apply thread lubricant to the adapter (110). Screw
the diaphragm housing (2) onto the adapter. Return
the back pressure regulator to operation.
2
Torque to 15-20 ft-lb (21-27 N•m).
3
Torque to 120-130 in-lb (13.6-14.7 N•m) oppositely and in
sequence, three times.
5
Apply thread lubricant.
6
113
5
ti8554a
F . 3. Back Pressure Regulator Repair
IG
111
3
110
5
107
104
103
2
102
101
112
ti8555a
311595C