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Tools Needed for Disassembly
Set of open-end wrenches
Set of metric hex key wrenches
Various retaining ring pliers
Flat-blade screwdrivers.
Disassembling the Dispense Valves
WARNING
To reduce the risk of electric shock, splashing fluid in
the eyes or on the skin, or other serious injury, AL-
WAYS follow the Pressure Relief Procedure on
page 2 and disconnect all power to the PrecisionMix
before servicing.
To remove the complete valve assembly from the
mixing block:
Refer to Fig. 8.
1. Disconnect the incoming fluid line from the volume
counter.
2. Disconnect the two air line connections.
3. Loosen the two cap screws (A) until the valve is free
from the mixing block.
4. Carefully lift off the valve assembly. The valve seat
and bottom o-ring may fall away.
AIR
SECTION
CAP SCREW
(A)
CAP SCREW
(B)
CAP
NUT
PACKING
NUT
FLUID
SECTION
Fig. 8: Dispense Valve
SERVICE
To remove just the top (air) section of the valve:
Refer to Fig. 8.
1. Disconnect the two air line connectors.
2. Unscrew the adjusting screw far enough for the valve
3. Remove the two cap screws (B) that go into the con-
4. With a hex wrench or similar tool, unscrew the pack-
5. Pull off the top section of the valve. This is a snug fit.
To disassemble the top (air) section of the valve:
Refer to Fig. 8 and the parts drawing on page 27.
NOTE: Spare Parts Kit 948–591 is available to repair
1. Remove the top section of the valve (see above).
2. Unscrew the adjusting screw.
3. Remove the two screws that are secured by cap
ADJUSTING
SCREW
4. Remove the top retaining ring from the piston rod (in-
5. Pull the piston rod down and hook under the top pis-
6. Remove the remaining retaining rings to complete
AIR LINE
CONNECTORS
7. Inspect the o–rings on the piston and piston rod.
When reassembling, be sure the two air connection
ports will be facing the outside of the machine.
To disassemble the bottom (fluid) section of the
valve:
Refer to Fig. 8 and the parts drawing on page 27.
CONNECTING
ROD
1. Remove the top section of the valve (see above).
2. Remove the glands and v–packings from the fluid
3. Clean and inspect all parts, and replace as neces-
cap screws (B) to clear it.
necting rods. DO NOT remove the two screws that
are secured by cap nuts.
ing nut.
WARNING
Wear protective eyewear and exercise caution
when disassembling a dispense valve.The air sec-
tion of the valve is spring-loaded, and parts may fly
out or spring apart when the valve is disassembled.
the dispense valves. Order one kit for each
valve. See the parts list on page 26.
nuts. Be careful – the cylinder halves are under ten-
sion and will spring apart. Also, the detent pin will
spring out from the cylinder cap.
side the cylinder).
ton with a hex wrench or similar tool.
disassembly of the cylinders.
Clean all parts and replace as necessary. Reas-
semble in reverse order.
housing.
sary. Reassemble in reverse order.
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