Graco 15X303 Technical reference manual

312782J
EN
Instructions-Parts
Air Actuated
Dispense Valve
To dispense plural component fluids and solvents. For professional use only.
Part No. 15X303, 26A355
High Pressure Dispense Valve
3000 psi (21 MPa, 207 bar) Maximum Fluid Working Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Working Pressure
Part No. 24T785
High Pressure Dispense Valve for Acid Catalyzed Materials
3000 psi (21 MPa, 207 bar) Maximum Fluid Working Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Working Pressure
Part No. 26A313
High Pressure Dump Valve for Acid Catalyzed Materials
3000 psi (21 MPa, 207 bar) Maximum Fluid Woriking Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Working Pressure
Part No. 15X304
Low Pressure Dispense Valve
300 psi (2.1 MPa, 21.0 bar) Maximum Fluid Working Pressure
100 psi (0.7 MPa, 7 bar) Maximum Air Working Pressure
Important Safety Instructions
Read all warnings and instructions in this manual. For complete
warnings and instructions see your proportioning system manual.
Hazard symbols refer to specific procedure risks. Save all instruc-
tions.
Low Pressure Valve
TI11581A
High Pressure Valves
TI11663A
ti30189a
15X304
26A313
15X303, 24T785,
and 26A355

Related Manuals
2312782J
Contents
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Connect the Air Lines . . . . . . . . . . . . . . . . . . . . . 3
Connect the Fluid Lines . . . . . . . . . . . . . . . . . . . 3
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Typical Installation . . . . . . . . . . . . . . . . . . . . . . . 5
System Pneumatic Schematic (used with
ProMix 2KS) . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operation (ProMix 2KS Only) . . . . . . . . . . . . . . . . . 7
Settings and Adjustments . . . . . . . . . . . . . . . . . . 7
Pressure Relief Procedure . . . . . . . . . . . . . . . . . 7
Operation (ProMix PD2K Only) . . . . . . . . . . . . . . . . 7
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Clean the Dispense Valve Daily . . . . . . . . . . . . . 7
Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
15X303 and 26A355 High Pressure Valve . . . . 10
24T785 High Pressure Valve for Acid
Catalyzed Materials . . . . . . . . . . . . . . . . . . 11
26A313 High Pressure Dump Valve for Acid
Catalyzed Materials . . . . . . . . . . . . . . . . . . 12
15X304 Low Pressure Valve . . . . . . . . . . . . . . . 13
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 16
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . 16
Related Manuals
See the following manuals for additional information on
the dispense valves.
Manual Description
312775 ProMix 2KS Manual System Installation
312776 ProMix 2KS Manual System Operation
312777 ProMix 2KS Manual System Repair-Parts
312778 ProMix 2KS Automatic System Installation
312779 ProMix 2KS Automatic System Operation
312780 ProMix 2KS Automatic System
Repair-Parts
332457 ProMix PD2K Manual System with
Advanced Display Module Installation
332562 ProMix PD2K Manual System with
Advanced Display Module Operation
3A2800 ProMix PD2K Manual System with
Advanced Display Module Repair-Parts
332339 ProMix PD2K Dosing Pumps
312781 Fluid Mix Manifold
312783 Color and Catalyst Change Valve Stacks
312786 ProMix 2KS Dump Valve and Third Purge
Valve Kits
312787 Color Change Module Kits for ProMix 2KS
or ProMix 3KS Electronic Proportioners
332455 Color Change Kits for ProMix PD2K Elec-
tronic Proportioners
312782 Dispense Valve

Installation
312782J 3
Installation
FIG. 2 shows the dispense valves installed in an elec-
tronic 2-component proportioning system. In this exam-
ple, the dispense valves are used as dose valves for
components A and B (DVA, DVB), an air purge valve
(APV), and a solvent purge valve (SPV).
FIG. 3 shows a pneumatic schematic of a complete
2-component proportioning system, in which the dis-
pense valves are also used as A and B dump valves,
and color change valves.
NOTE: See manual 332339 for instructions on how to
install the dispense valves in a ProMix PD2K Electronic
Positive Displacement Proportioning System.
Connect the Air Lines
Clean all lines and connections of dirt, burrs, etc., and
blow them out with clean air before connecting them to
the system. The air supply line should contain an air fil-
ter to remove harmful dirt and moisture from the com-
pressed air.
Use a normally closed 4-way air solenoid valve to con-
trol the dispense valve. Attach 5/32 in. (4 mm) OD air
supply lines from the 4-way valve to the air inlets of the
dispense valve.
Connect the Fluid Lines
Connect a grounded fluid line from the pump or meter to
the 1/4 npt fluid inlet of the dispense valve adapter.
If fluid is supplied by a pump, install a fluid pressure reg-
ulator upstream of the dispense valve. A fluid regulator
enables you to control fluid pressure more accurately
than by regulating air pressure to the pump.
Install a fluid filter to remove particles and sediment
which may clog the nozzle.
Accessories
Two accessories are required in your system: a
bleed-type master air valve and a fluid drain valve.
These accessories help reduce the risk of serious injury
including fluid injection, splashing in the eyes or on the
skin, and injury from moving parts if you are adjusting or
repairing the pump.
The bleed-type master air valve is required only with
air-powered pumps. It relieves air trapped between this
valve and the pump after the air regulator is shut off.
Trapped air can cause the pump to cycle unexpectedly.
Locate the valve close to the pump.
The fluid drain valve helps relieve fluid pressure in the
displacement pump, hose, and dispense valve; trigger-
ing the valve to relieve pressure may not be sufficient.
Grounding
To reduce the risk of static sparking, ground the pump
and all other components used or located in the dis-
pensing area. Check your local electrical code for
detailed instructions for your area and type of equipment
and be sure to ground all of these components.
•Fluid hoses: use only electrically conductive hoses
with a maximum of 500 feet (150 m) combined hose
length to ensure grounding continuity.
•Dispense valve: obtain grounding through connec-
tion to a properly grounded fluid hose and pump.

Installation
4312782J
Components
FIG. 1. Valve Air Ports
TI11663A
TI11581A
15X303, 24T785, and 26A355 High Pressure
Dispense Valves
26A313 High Pressure
Dump Valve
5/32 in. (4 mm) OD air tube
fitting, to close
5/32 in. (4 mm) OD air tube
fitting, to open 5/32 in. (4 mm) OD air tube
fitting, to open
Vent port
Optional air
open port
Valve position
sight port
Seal weep port
and Lubrication
Cup connection
TI31156A
15X304 Low Pressure
Dispense Valve
Actuation indicator
5/32 in. (4 mm) OD air tube
fitting, to open
Valve position
sight port
Seal weep port
and Lubrication
Cup connection
Optional air
open port

Installation
312782J 5
Typical Installation
Key:
MA Component A Meter
DVA Component A Dose Valve
MB Component B Meter
DVB Component B Dose Valve
MS Solvent Meter
SPV Solvent Purge Valve
APV Air Purge Valve
ASL Component A Supply Line
BSL Component B Supply Line
APL Air Purge Line
SPL Solvent Purge Line
FIG. 2: Typical Installation
TI12556a
MA
MB
DVB
MS
SPV
DVA
APV
APL SPL
BSLASL

Installation
6312782J
System Pneumatic Schematic (used with ProMix 2KS)
FIG. 3. System Pneumatic Schematic
3/8 AIR FILTER
MANUAL DRAIN
5 MICRON
WALL MOUNT ONLY
FLUSH AIR TO FLUID INLET 1/4 TUBE
TO MANIFOLD 1/4 TUBE
4-WAY SOLENOID
12 VDC
PURGE A
VALVE
DUMP A
VALVE
(OPTIONAL)
4-WAY SOLENOID
12 VDC
3-WAY SOLENOID
12 VDC
3-WAY SOLENOID
12 VDC
MANIFOLD
AIR EXHAUST MUFFLER
OPEN
CLOSE
OPEN
5/32 TUBE
5/32 TUBE
PURGE B
VALVE
4-WAY SOLENOID
12 VDC
CLOSE
OPEN
5/32 TUBE
DUMP B
VALVE
(OPTIONAL)
4-WAY SOLENOID
4-WAY SOLENOID
12 VDC
OPEN
5/32 TUBE
AB
AB
AB
AB
A
A
DOSE A
VALVE
CLOSE
OPEN
5/32 TUBE
DOSE B
VALVE
CLOSE
OPEN
5/32 TUBE
3-WAY SOLENOID
12 VDC
GFB 1
VALVE
(OPTIONAL)
5/32 TUBE
A
COLOR 1
COLOR 2
COLOR 3
COLOR 4
COLOR 5
COLOR 6
COLOR 7
COLOR 8
COLOR SOLVENT
COLOR 9
COLOR 10
COLOR 11
COLOR 12
CATALYST 1
CATALYST 2
CATALYST 3
CATALYST 4
CATALYST SOLVENT
COLOR
CHANGE
CONTROL
COLOR
VALVE
STACKS
MAC
36 SERIES SOLENOID VALVES
05
COLOR 13
COLOR 14
COLOR 15
COLOR 16
COLOR 17
COLOR 18
COLOR 19
COLOR 20
COLOR 21
COLOR 22
COLOR 23
COLOR 24
COLOR 25
COLOR 26
COLOR 27
COLOR 28
COLOR 29
COLOR 30
PURGE C
VALVE
(OPTIONAL)
12 VDC
CLOSE
OPEN
5/32 TUBE
AB
AIR EXHAUST MUFFLER
3-WAY SOLENOID
12 VDC
GFB 2
VALVE
(OPTIONAL)
OPEN
5/32 TUBE
A
OPEN
MANIFOLD
PURGE AIR
CONTROL AIR

Operation (ProMix 2KS Only)
312782J 7
Operation (ProMix 2KS
Only)
Settings and Adjustments
Set the actuating air to at least 75 psi (0.52 MPa, 5.2
bar) and start the pump. Adjust the pump speed and
pressure to obtain the desired flow rate. Always use the
lowest pump speed necessary to get the results you
want.
To decrease needle travel, turn the cap (11, see pages
10, 11, and 13) clockwise; to increase, turn counter-
clockwise. The valve is factory set at one open turn. The
maximum setting is four turns open.
Pressure Relief Procedure
1. Shut off the fluid supply to the dispense valve.
2. Actuate the dispense valve to relieve fluid pressure
in the valve.
3. Relieve fluid pressure upstream and downstream of
the dispense valve. See your system operation
manual.
4. If you suspect the spray tip or hose is clogged or
that pressure has not been fully relieved after follow-
ing the steps above, very slowly loosen tip guard
retaining nut or hose end coupling to relieve pres-
sure gradually, then loosen completely. Clear hose
or tip obstruction.
Operation (ProMix PD2K
Only)
See the ProMix PD2K Electronic Proportioner Operation
manual (332562) for operating instructions.
Maintenance
Clean the Dispense Valve Daily
An important part of the care and maintenance of your
automatic dispense valve is proper flushing. Flush the
valve daily with a compatible solvent until all traces of
fluid are removed from the valve passages. Relieve the
pressure before flushing.
Clean the outside surfaces of the valve by wiping with a
soft cloth dampened with a compatible solvent.
Flushing
Before flushing, be sure the entire system and flushing
pails are properly grounded. Refer to Grounding on
page 3. Relieve the pressure. Always use the lowest
possible fluid pressure, and maintain firm metal-to-metal
contact between the dispense valve and the pail during
flushing to reduce the risk of fluid injection injury, static
sparking, and splashing.
Start the pump and flush the system with a compatible
solvent as explained in the instructions for your pump.
Check the system under pressure for leaks; if any are
found, relieve the pressure and repair the leaks. Pres-
surize the system again and make sure the leaking has
stopped.
NOTICE
Be sure the solvent used is compatible with the fluid
being dispensed, to avoid clogging the valve’s fluid
passages.
NOTICE
Never immerse the entire dispense valve in solvent.
Immersing in solvent removes lubricants and may
damage the o-rings.

Troubleshooting
8312782J
Troubleshooting
Before servicing this equipment always make sure to
relieve the pressure.
NOTE: Check all possible causes and solutions before
disassembling.
Repair
NOTE: See the Dosing Pumps manual (332339) for
disassembly instructions on PD2K system.
Disassembly
1. Relieve the pressure.
2. Flush the valve with a compatible solvent.
3. Relieve the pressure after flushing and disconnect
the fluid and air hoses.
4. Unscrew the cap (C) to remove spring pressure on
the valve.
NOTE: Another method of removing spring pres-
sure is by applying air to the ON port, to lift the valve
needle off the seat.
5. Unscrew the dispense valve from the adapter (A).
Inspect the needle ball (B). Also inspect the seat (S)
in the adapter for damage. The seat is reversible.
See FIG. 4.
NOTE: See Fluid Mix Manifold Manual 312781 for seat
replacement instructions and part numbers.
Problem Cause Solution
Valve will not close. Fluid needle binding. Clean, repair.
Piston o-rings binding. Repair.
Obstructed or worn needle or seat. Clean or replace.
Valve will not open. Fluid needle binding. Clean or repair.
Piston o-rings binding. Repair.
No trigger or actuator pressure. Check, clean all lines.
Worn or dry piston o-rings. Replace.
Valve will not dispense. Fluid supply source is not operating. Check on fluid supply source.
Fluid line clogged. Clear.
Fluid valve closed. Open.
Clogged orifice or needle seat. Clean.
FIG. 4. Valve Adapter and Seat
TI12822A
A
B
S
C
ON Port

Repair
312782J 9
NOTE: See the parts drawings on pages 10 and 13.
6. Unscrew valve cap (11). Remove the spring (12).
7. Hold the needle flats with a wrench to keep it from
turning. Unscrew the piston (9, high pressure
valves) or retainer (10, low pressure valves) from
the needle.
8. Remove the o-rings (7, 8) from the piston (9).
9. Push the needle (22) from the top while pulling it
from the bottom of the fluid body (3).
NOTE: Needle may be hard to remove.
10. Unscrew the needle ball assembly (23) from the
needle (22).
11. Unscrew the fluid body (3) from the air body (6).
Remove the packing (19), bearing (5), and u-cup (4)
from the fluid body.
12. On high pressure valves, remove the o-ring (17)
from the air body (6).
13. Clean, inspect, and replace parts as needed.
Reassembly
NOTE: Seal Kits 15U933 (for high pressure dispense
valve 15X303 and 26A355), 24T817 (for acid catalyzed
valves 24T785 and 26A313), and 15W621 (for low pres-
sure dispense valve 15X304) are available to replace
the seals. Parts included in the kit are marked with an
asterisk, for example (4*). For best results, use all the
parts in the kit.
NOTE: Use the 262028 Seal Installation Tool (supplied
with the ProMix 2KS) to ensure proper installation of the
u-cup (4).
1. Using the 262028 Installation Tool, install the u-cup
(4*) into the fluid body (3) with the lips facing down.
Install the bearing (5*) and packing (19*).
2. Slide the needle (22*) into the fluid body (3) from
the top, down through the packing (19), bearing (5),
and u-cup (4).
3. Apply thread sealant and screw the needle ball
assembly (23*) onto the needle (22*).
4. Apply thread sealant and screw the fluid body (3)
onto the air body (6).
5. On high pressure valves, install the o-ring (17*) on
the air body (6).
6. Install the o-rings (7*, 8*) on the piston (9). Lubricate
the o-rings.
7. Reinstall the piston (9):
a. On high pressure valves, apply thread sealant
to the top threads of the needle (22*). Holding
the needle (22) steady by its flats, screw the pis-
ton (9) onto the needle (22*).
b. On low pressure valves, slide the piston (9) onto
the needle (22*). Apply thread sealant to the top
threads of the needle. Holding the needle (22)
steady by its flats, screw the retainer (10) onto
the needle.
8. Before performing step 9, screw the dispense valve
securely into the adapter (A, FIG. 4).
9. Install the spring (12) and valve cap (11).
NOTE: On high pressure valves, screw the valve cap
(11) onto the air body (6) only until slight resistance is
felt as the cap contacts the o-ring (17*). Do not tighten
the valve cap (11) at this time.
10. Screw the valve cap (11) down onto the air body (6)
until additional resistance is felt and the cap is tight
with the body.
11. Unscrew the valve cap (11) one complete turn for
the factory needle setting, or unscrew cap to setting
prior to repair.
NOTE: To decrease needle travel, turn the cap (11)
clockwise; to increase, turn counterclockwise. The valve
is factory set at one open turn. The maximum setting
is four turns open.

Parts
10 312782J
Parts
15X303 and 26A355 High Pressure Valve
*Parts included in Rebuild Kit 15U933 (purchase sep-
arately).
--- These parts are not available separately.
‡ Remove (12) and replace with this spring (marked
with black stain) when valve is used as a dump valve
or color change valve.
15V737 Valve Lubricator Cup (Option)
Install in fluid body (3) to lubricate seal (4).
TI11582A
19*
9
*17
12
6
5*
7*
13
3
8*
14
4*
11
15
15
22*
23*
20*
Ref.
No. Part No. Description Qty
3 --- BODY, fluid 1
4* --- SEAL, u-cup, spring applied;
uhmwpe
1
5* --- BEARING, needle 1
6 --- BODY, air 1
7* --- O-RING, shaft, piston; buna-N 1
8* --- O-RING, body, piston; buna-N 1
915T413PISTON 1
11 --- CAP, valve 1
12 17B769 SPRING, compression (Model 15X303) 1
15T454 SPRING, compression (Model 26A355) 1
13 104640 GASKET; buna-N 2
14 104644 PLUG, screw 2
15 109193 ELBOW, tube fitting; 10-32 x 5/32 in. (4
mm) OD tube (Model 15X303)
2
110460 ELBOW, tube fitting; 10-32 x 5/32 in. (4
mm) OD tube; nickel plated brass
(Model 26A355)
2
17* --- O-RING, body, air; buna-N 1
19 --- PACKING; uhmwpe 1
20* --- O-RING; ptfe 1
22* --- SHAFT, needle 1
23* --- BALL ASSEMBLY, needle 1
24 15V818 VENT, breather; not shown; remove
(15) and install breather vent in (11)
when valve is used as dump valve or
color change valve
1
25‡ 17B969 SPRING, compression (not shown) 1
TI13019A