Service And Repair Procedures For The Bpr - Graco 25R487 Instructions - Parts Manual

Service and Repair
Service and Repair Procedures
for the BPR
NOTE: Regular cleaning and inspection of the BPR,
based on the degree and kind of service, is essential.
1. Shut off the pump.
2. On spring models, open the BPR by turning the
adjustment screw (43) counterclockwise until no
spring pressure is felt. See F
3. Follow the Pressure Relief Procedure on page 6 to
relieve all air and fluid pressures in the system.
NOTE: The BPR can either be serviced on line or
removed from the circulation line for service.
4. Clean the BPR with a compatible solvent when ser-
vicing and repairing the BPR.
5. To repair the BPR see the following instructions,
according to your equipment (see F
- For the air section components of the BPR, see
Air Section Components Service and Repair.
- For the spring section components, see
Mechanical (Spring) Components Service
and Repair.
- For the fluid section components see Fluid
Section Components Service and Repair.
8
. 4.
IG
. 2):
IG
Air Section Components Service and
Repair
See F . 3. The air section housing (15) can be removed
IG
by unscrewing it from the BPR and repaired offline, if
desired.
Inspect the piston rod (15b), the diaphragm (15e), and
the support washer plate (15c) for damage. Replace
parts as needed.
Mechanical (Spring) Components Service
and Repair
See F . 4. Inspect the cap (42), spring guide (41),
IG
spring (40), spring spacer (44), and spring bearing (45)
for damage. Replace parts as needed.
Fluid Section Components Service and
Repair
See F . 3. Inspect plate (7), gasket (13) on 25R487
IG
only, diaphragm (2), diaphragm gasket (3), gasket (4),
retainer (5), stud (6), and seat (10). Replace parts as
needed.
NOTES:
• Replace o-ring (18) during every inspection.
• Replace o-ring (9) when removing the seat (10).
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