Repairing The Diaphragm Valve - Graco EcoQuip EQ200T Operation, Repair, And Parts

Repairing the the Diaphragm Diaphragm Valve
Repairing Repairing the Diaphragm
See Common Spare Parts, page 47
NOTE: The diaphragm can be replaced without NOTE: NOTE:
removing the assembly from the panel. You will need
an 8 mm Allen wrench for the EQ400 and a 6 mm
for the EQ200.
1. Perform the Pressure Relief Procedure, page 8
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.
EQ200 shown, EQ400 uses two shims.
1
NOTE: NOTE: Do not disassemble the canister. NOTE:
334666C
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
.
7. Relieve the pressure applied in step 2.
8. Test and confirm that the unit is working properly.
compound) and hand-tighten it (only as far as
necessary) to establish the alignment with the
canister.
NOTE: NOTE: There are one or two shims between NOTE:
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.
3
1
4
2
NOTE: NOTE: This can be done using only water to NOTE:
charge the equipment – there is no need to use
abrasive for this test.
Repair
29