Repairing The Diaphragm Valve - Graco EcoQuip 300 Operation, Repair, And Parts

Repair
Repairing the the Diaphragm Diaphragm Valve
Repairing Repairing the Diaphragm
See Enclosure Parts List, page 39
NOTE: NOTE: NOTE: The diaphragm can be replaced without
removing the assembly from the panel. You will need
an 8 mm Allen wrench for the EQ600 and a 6 mm
for the EQ300.
1. Perform the Pressure Relief Procedure, page
2. Apply more than 80 psi (5.5 Bar, MPa) air
pressure to the regulator inlet to cause the piston
to retract.
3. Loosen all 4 Allen-head cap-bolts evenly and
then remove them completely while supporting
the canister of the diaphragm valve.
EQ300 shown, EQ600 has two shims.
1
32
Valve
Valve
4. Replace the diaphragm (natural rubber
for repair kits.
5. Insert all 4 Allen-head cap bolts and hand-tighten.
6. Tighten the cap-bolts in an alternating pattern
10.
7. Relieve the pressure applied in step 2.
8. Test and confirm that the unit is working properly.
NOTE: Do not disassemble the canister.
NOTE: NOTE:
compound) and hand-tighten it (only as far as
necessary) to establish the alignment with the
canister.
NOTE: NOTE: NOTE: There are one or two shims between
the diaphragm and the actuator. Keep the
shims and reuse them (they do not come with
the replacement diaphragm). Do not cause
any pre-load or torque on the diaphragm by
over-tightening it in a misaligned position.
(see image below) to 80 +/- 8 in-lb (9 +/- 0.9 N•m).
This will cause a slight bulge in the diaphragm
between the canister and the stainless steel
casting.
NOTE: NOTE: This can be done using only water to NOTE:
charge the equipment – there is no need to use
abrasive for this test.
334667G