Repair; Disconnect - Graco 26D274 Instructions Manual

Repair

Repair
If the valve is hot, wait for it to cool completely before
determining whether or not you can repair it. Some
materials, like polyurethanes, may cure permanently
when cooled and exposed to air, preventing you from
disassembling the dispense valve. If you are working
with such a material, instead of waiting for the valve to
cool completely, repair the valve while the material is at
a temperature where the material is soft enough to work
with. Alternatively, if the material can be reheated later,
you can repair the valve after it has cooled, reheating
the material as necessary.
Perform this procedure before servicing the dispense
valve.
1. Make sure material supply has been shut off.
2. Perform the Pressure Relief Procedure, on page
9.
3. Make sure air supply has been shut off.
4. If the material in the dispense valve can be
reheated, wait for the dispense valve to cool
thoroughly before repairing it.
If the material in the dispense valve cures
permanently when cooled and/or exposed to air,
repair the valve while the material is at a
temperature where the material is soft enough to
work with.
5. Disconnect the air section to repair the valve. See
Disconnect, on page 14.
14

Disconnect

NOTE: Always replace o-rings after the valve has been
disassembled.
1. Perform steps 1 through 4 from Repair procedure,
page 14.
2. Loosen four screws (135) and remove outlet
housing (105), then loosen two screws(110). Place
the fluid section in a vise, pull out the air section and
disconnect the fluid and air section.
3. If necessary, replace the old air section with a new
air section to reduce downtime. Bring the old air
section to a work bench for repair.
135
105
F . 5
IG
110
101
3A8814A
102