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

Repair
Repairing the the Diaphragm Diaphragm Valve
Repairing Repairing the Diaphragm
NOTE: The diaphragm (17C127 – EQ300, 17C128
NOTE: NOTE:
– EQ600) can be replaced without removing the
assembly from the panel. You will need an 8 mm
Allen wrench for the EQ600S and a 6 mm for the
EQ300S.
1. Perform the Pressure Relief Procedure, page 8
2. Loosen all 4 Allen-head cap-bolts evenly and
then remove them completely while supporting
the canister of the diaphragm valve.
30
Valve
Valve
3. Replace the diaphragm (natural rubber
4. Insert all 4 Allen-head cap bolts but do not tighten
5. Apply more than 80 psi (5.5 Bar, MPa) air
6. With the piston retracted, hand-tighten the 4
7. Release the air pressure.
8. Tighten the cap-bolts in an alternating pattern
.
9. Test and confirm that the unit is working properly.
compound) and hand-tighten it as far as possible
to establish the alignment with the canister.
NOTE: NOTE: There are two shims between the NOTE:
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.
them.
pressure to the regulator inlet to cause the piston
to retract.
Allen-head cap bolts.
(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.
3
1
4
2
NOTE: This can be done using only water to
NOTE: NOTE:
charge the equipment – there is no need to use
abrasive for this test.
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