Graco PrecisionMix ii, Instructions And Parts List

Page: 74 / 260

Operation 4–8
Operation
Purging the Ratio Check Valves
WARNING
PRESSURIZED EQUIPMENT HAZARD
To avoid splashing fluid in the eyes when
purging the ratio check valves:
Wear eye protection.
Only open the ratio check valves enough to
allow fluid to flow at a rate of 100 to 200 cc per
minute.
WARNING
INJECTION HAZARD
To reduce the risk of a serious injury
from injection or splashing fluid, follow
the
Pressure Relief Procedure on page
4–3 whenever you are instructed to relieve the
pressure.
CAUTION
The fluid shut-off valves and ratio check valves are
retained in their housings by mechanical stops that
prevent accidental removal of the valve stem while
the manifold is pressurized. Do not use a tool to
open or close the valve stems. If manual force
cannot turn the valve stems, the system pressure
must be relieved and the valve properly disas-
sembled and cleaned to remove the resistance.
NOTE: Refer to Figs. 2.2, 2.3, and 2.4, pages 2–7
through 2–9, to understand the fluid paths that occur
during this procedure, which involves the manual
manipulation of the fluid shut-off valves and ratio check
valves.
1. Relieve the system pressure.
2. Close Component A, B, and C fluid shut-off valves.
See Fig. 4.6.
3. Place a container under the Component B and C
ratio check valve dispense tube.
4. Turn on the solvent supply.
5. Open the Component C ratio check valve one-half
to one full turn.
Fig. 4.6
A
KEY
A Dispense Valve Knob
B Purge Valve Knob
C Fluid Shut-off Knobs
D Ratio Check Valve Knob
B
D
C
D
TI0224
TI0173
D
A
B
C