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

Repair
Repairing the the Diaphragm Diaphragm Valve
Repairing Repairing the Diaphragm
NOTE: NOTE: The diaphragm (17C127 – EQ300, 17C128 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.
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Valve
Valve
3. Replace the diaphragm (natural rubber
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.
4. Insert all 4 Allen-head cap bolts but do not tighten
them.
5. Apply more than 80 psi (5.5 Bar, MPa) air
pressure to the regulator inlet to cause the piston
to retract.
6. With the piston retracted, hand-tighten the 4
Allen-head cap bolts.
7. Release the air pressure.
8. Tighten the cap-bolts in an alternating pattern
(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.
.
9. Test and confirm that the unit is working properly.
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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