Pressure Relief Procedure; Operation; Flushing The System - Graco 970019 Instructions-Parts List Manual

Pressure Relief Procedure

WARNING
INJECTION HAZARD
The system pressure must be manually
relieved to prevent the system from
starting or spraying accidentally. Fluid
under high pressure can be injected through the
skin and cause serious injury. To reduce the risk of
an injury from injection, splashing fluid, or moving
parts, follow the Pressure Relief Procedure
whenever you:
D are instructed to relieve the pressure,
D stop dispensing,
D check or service any of the system equipment,
D or install or clean the dispense ball valve.
1. Lock the gun/valve trigger safety.
2. Close the pump air bleed valve (H, required in your
system).
3. Shut off the main air bleed valve (E, required in
your system). Set the ram director valve (U) to
DOWN. The ram will slowly drop.
4. Unlock the gun/valve trigger safety.
5. Hold a metal part of the gun/valve firmly to the side
of a grounded metal pail, and trigger the gun/valve
to relieve pressure.
6. Lock the gun/valve trigger safety.
7. Open the drain valve (required in your system)
and/or the pump bleeder valve (DD), having a
container ready to catch the drainage.
8. Leave the drain valve open until you are ready to
spray/dispense again.
If you suspect that the spray tip/nozzle or hose is
completely clogged, or that pressure has not been fully
relieved after following the steps above, very slowly
loosen the tip guard retaining nut or hose end coupling
and relieve pressure gradually. Then loosen it com-
pletely. Then clear the tip/nozzle or hose.
9. Repeat procedure for each ram (for models
970019 and 970020 only).

Operation

Flushing the System

Flush the system before initial use to prevent material
contamination.
Flush the system before performing the initial
material loading procedure. The system was fac-
tory-tested using a light soluble oil, a soybean oil, or
other oil as tagged. Flush the system to avoid con-
taminating the material that has been designated for
initial material loading.
To flush the system, perform the following procedure:
1. Select material to be used.
Use fluids and solvents that are chemically compat-
ible with the equipment wetted parts. Refer to the
Technical Data sections of all the equipment
manuals. Always read the material manufacturer's
literature before using fluid or solvent in this pump.
2. Verify that factory-test oil and material are compat-
ible:
a. If substances are compatible, omit following
step b and proceed to step 4.
b. If substances are incompatible, perform re-
maining steps to flush system.
3. Select drum of solvent that dissolves, cleans, and
eliminates factory-test oil from system. If neces-
sary, check with Graco Distributor or material sup-
plier for recommended solvent.
4. Before flushing, be sure entire system and flushing
drums are properly grounded. Refer to System
Grounding, on page 8.
5. Using compatible solvent, perform Starting and
Adjusting System Rams procedure and Starting
and Adjusting the Pump procedure on page 15.
6. Flush solvent through system for 1 to 2 minutes.
7. Remove drum containing solvent.
CAUTION
WARNING
310309
13