Graco 256994 Operation manual

Instructions-Parts
Color and Catalyst
Change Valve Stacks 312783G
EN
For color/catalyst changing or distribution of industrial paints and coatings or fluids.
See pages 3 and 4 for model information, including maximum 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 instructions.
TI11668b
Low Pressure Valve Stack 15V813
TI11665b
High Pressure Valve Stack 15V817

Related Manuals
2312783G
Contents
Related Manuals . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Low Pressure Valve Stacks . . . . . . . . . . . . . . . . 3
High Pressure Valve Stacks . . . . . . . . . . . . . . . . 4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Low Pressure Color/Catalyst Valve Stacks -
Series B . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Low Pressure Color/Catalyst Valve Stacks -
Series A . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
High Pressure Color/Catalyst Valve Stacks -
Series B . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
High Pressure Color/Catalyst Valve Stacks -
Series A . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Low Pressure Valve Stack Dimensions -
Series B . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Low Pressure Valve Stack Dimensions -
Series A . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
High Pressure Valve Stack Dimensions -
Series B . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
High Pressure Valve Stack Dimensions -
Series A . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
California Proposition 65 . . . . . . . . . . . . . . . . . . . 15
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . 16
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . 16
Related Manuals
See the following manuals for additional information on
the color and catalyst change valve stacks.
Manual in
English 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
312782 Dispense Valve
312787 Color Change Module Kit

Models
312783G 3
Models
Low Pressure Valve Stacks
300 psi (2.1 MPa, 21 bar) Maximum Fluid Working Pressure
Each stack includes one additional valve for solvent.
Valve Stack
Part No. Series Valve Stack Description Valve Part No. Valve Quantity
256994
B
1 color
15X304
2
15V812 2 color/catalyst change 3
256290 3 color/catalyst change 4
15V813 4 color/catalyst change 5
256292 5 color/catalyst change 6
256293 6 color/catalyst change 7
15V814 7 color/catalyst change 8
256295 8 color/catalyst change 9
256296 9 color/catalyst change 10
256297 10 color/catalyst change 11
256298 11 color/catalyst change 12
15V815 12 color/catalyst change 13
256300 13 color/catalyst change 14
256301 14 color/catalyst change 15
256302 15 color/catalyst change 16
256303 16 color/catalyst change 17
256304 17 color/catalyst change 18
256305 18 color/catalyst change 19
256306 19 color/catalyst change 20
256307 20 color/catalyst change 21
256308 21 color/catalyst change 22
256309 22 color/catalyst change 23
256310 23 color/catalyst change 24
256311 24 color/catalyst change 25
256312 25 color/catalyst change 26
256313 26 color/catalyst change 27
256314 27 color/catalyst change 28
256315 28 color/catalyst change 29
256316 29 color/catalyst change 30
256372 30 color/catalyst change 31

Models
4312783G
High Pressure Valve Stacks
3000 psi (21 MPa, 210 bar) Maximum Fluid Working Pressure
Each stack includes one additional valve for solvent.
Valve Stack
Part No. Series Valve Stack Description Valve Part No. Valve Quantity
256995
B
1 color
15X303
2
15V816 2 color/catalyst change 3
256339 3 color/catalyst change 4
15V817 4 color/catalyst change 5
256341 5 color/catalyst change 6
256342 6 color/catalyst change 7
256343 7 color/catalyst change 8
256344 8 color/catalyst change 9
256345 9 color/catalyst change 10
256346 10 color/catalyst change 11
256347 11 color/catalyst change 12
256348 12 color/catalyst change 13
256349 13 color/catalyst change 14
256350 14 color/catalyst change 15
256351 15 color/catalyst change 16
256352 16 color/catalyst change 17
256353 17 color/catalyst change 18
256354 18 color/catalyst change 19
256355 19 color/catalyst change 20
256356 20 color/catalyst change 21
256357 21 color/catalyst change 22
256358 22 color/catalyst change 23
256359 23 color/catalyst change 24
256360 24 color/catalyst change 25
256361 25 color/catalyst change 26
256362 26 color/catalyst change 27
256363 27 color/catalyst change 28
256364 28 color/catalyst change 29
256365 29 color/catalyst change 30
256371 30 color/catalyst change 31

Installation
312783G 5
Installation
1. Connect 5/32 in. (4 mm) OD air actuation tubes
from the valve solenoids to the air inlets (A) of each
valve. See FIG. 1.
NOTE: The high pressure color change valve uses a
spring-operated valve closure vent (20) which does not
require a second air actuation line. If you are installing a
bare valve, remove the elbow fitting from the top port
and install the breather vent. Replace the spring with the
one marked with black stain. Both the breather and the
marked spring are shipped loose.
2. Connect fluid supply lines to the 1/4 npt(f)inlet (B) of
each valve adapter. Supply solvent to one valve (S)
at the top of the stack.
NOTE: Excessive inlet fitting torque may cause the fit-
ting to extend past its normal depth and contact the
valve needle, resulting in misalignment and leakage.
After installing the inlet fitting, verify that the needle trav-
els freely by charging the valve with air or removing the
cap and manually actuating the needle.
NOTE: Paint Circulating System
The color change valves have two fluid ports for
each individual valve. If you are circulating
paint, plumb the valves in one port and out the
other. Another option is to use a tee fitting to cir-
culate.
NOTE: Verify that all unused fluid ports on the color
change valve stack are plugged before operation. An
open port will leak fluid.
3. Connect the gun fluid supply line to the fluid outlet
port (C) of the color change manifold.
NOTE: A check valve is recommended at the inlet of all
valves to prevent backflow if avalve fails, and to prevent
color crossover if two dead head valves are open at the
same time.
NOTE: High pressure valves are factory-set at one turn
open from fully closed. This setting provides the
required spring force to prevent fluid back flow from the
outlet manifold to the valve at outlet manifold pressures
up to 3000 psi (21 MPa, 210 bar). If valves on the stack
are not being used, close the valve completely or plug
the valve inlet and circulation ports.
If a valve is adjusted more than 1-1/4 turn open, back
flow pressure will be reduced.
FIG. 1. Valve Stack Connections
TI11665b
TI11668b
C
AB
A
A
B
C
20
High Pressure Valve Stack
S
S
Low Pressure Valve Stack

Parts
6312783G
Parts
Low Pressure Color/Catalyst Valve Stacks - Series B
See the Low Pressure Valve Part Quantity Chart -
Series B on page 7 to determine the quantity of each
part in your valve stack.
*Part included in Seal Kit 15W621 (purchase sepa-
rately). Kit includes additional parts; see Dispense
Valve manual 312782.
--- These parts are not available separately.
Technical Data, Low Pressure Stacks
TI11669b
4
2
9
5*
3
1
612
10 12 8
7
14
11
Ref.
No. Part No. Description Qty
1 20A006 MANIFOLD, Bottom, Color Change 1
2 20A004 MANIFOLD, Middle, Color Change 
3 20A005 MANIFOLD, Top 
4 15X304 VALVE, Low Pressure; includes
item 15; see manual 312782 
5* 15Y627 O-RING; PTFE, Size 116 
6 25B513 SEAT, Valve, Low Pressure 
7 101970 PLUG, Pipe 
8 110004 O-RING; PTFE, Size 011 
9 121112 SCREW, cap, socket-head; 1/4-20
x 5/8 in. (16mm) 
10 20A007 PLUG, Color Change 
11 16P656 FITTING, Outlet 1
12 111457 O-RING; PTFE, Size 012 
14 104893 O-RING; PTFE, Size 010 1
15 15T871 END CAP, Color Change (Assem-
bly 256994 only; not shown) 1
Maximum Fluid Working
Pressure 300 psi (2.1 MPa, 21 bar)
Wetted Parts 303 sst, tungsten carbide,
ptfe, acetal
Color Change Valves: see
manual 312782
Weight see page 7

Parts
312783G 7
Low Pressure Valve Part Quantity Chart - Series B
Find your Valve Stack Part No. in the left column and the desired reference number in the top row to find the part
quantity used in your valve stack.
Valve
Stack
Part No.
Reference Numbers Weight
lb (kg)234567891012
256994 0 0 2 2 2 2 1 2 0 2 2.35 (1.07)
15V812 0 1 3 3 3 3 1 2 1 4 4.05 (1.84)
256290 0 1 4 4 4 4 1 2 0 4 4.70 (2.13)
15V813 1 1 5 5 5 5 2 4 1 6 6.40 (2.90)
256292 1 1 6 6 6 6 2 4 0 6 7.05 (3.20)
256293 2 1 7 7 7 7 3 6 1 8 8.75 (3.97)
15V814 2 1 8 8 8 8 3 6 0 8 9.40 (4.26)
256295 3 1 9 9 9 9 4 8 1 10 11.10 (5.03)
256296 3 1 10 10 10 10 4 8 0 10 11.75 (5.33)
256297 4 1 11 11 11 11 510 112 13.45 (6.10)
256298 4 1 12 12 12 12 5 10 0 12 14.10 (6.40)
15V815 5 1 13 13 13 13 6 12 1 14 15.80 (7.17)
256300 5 1 14 14 14 14 612 014 16.45 (7.46)
256301 6 1 15 15 15 15 714 116 18.15 (8.23)
256302 6 1 16 16 16 16 7 14 0 16 18.80 (8.53)
256303 7 1 17 17 17 17 8 16 1 18 20.50 (9.30)
256304 7 1 18 18 18 18 816 018 21.15 (9.59)
256305 8 1 19 19 19 19 918 120 22.85 (10.36)
256306 8 1 20 20 20 20 9 18 0 20 23.50 (10.66)
256307 9 1 21 21 21 12 10 20 1 22 25.20 (11.43)
256308 9 1 22 22 22 22 10 20 022 25.85 (11.73)
256309 10 123 23 23 23 11 22 124 27.55 (12.50)
256310 10 1 24 24 24 24 11 22 0 24 28.20 (12.80)
256311 11 1 25 25 25 25 12 24 1 24 29.90 (13.56)
256312 11 126 26 26 26 12 24 026 30.55 (13.86)
256313 12 127 27 27 27 13 26 128 32.25 (14.63)
256314 12 1 28 28 28 28 13 26 0 28 32.90 (14.92)
256315 13 1 29 29 29 29 14 28 1 30 34.60 (15.70)
256316 13 130 30 30 30 14 28 030 35.25 (15.99)
256372 14 131 31 31 31 15 30 132 36.95 (16.76)

Parts
8312783G
Low Pressure Color/Catalyst Valve Stacks - Series A
*Part included in Seal Kit 15W621 (purchase sepa-
rately). Kit includes additional parts; see Dispense
Valve manual 312782.
--- These parts are not available separately.
Technical Data, Low Pressure Stacks
TI11669A
1
2
3
4
6
7
8
9
10
11
12
*15
16
8
2
Ref. No. Part No. Description 20A727 20A728 
1 15X304 VALVE, low pressure; includes item 15; see manual 312782 2 1
2 15T875 SCREW; 5/16-24 x 5/8 in. (16 mm) 4 4
3 15T436 ADAPTER, manifold 2 1
4 101970 PLUG, pipe 2 1
6 15T793 MANIFOLD, fluid port --- ---
7 15T574 SEAT, valve needle 2 1
8 110004 O-RING; ptfe 2 2
9 15T792 MANIFOLD, body 1 1
10 15T794 MANIFOLD, end cap --- ---
1115X129 PLUG, housing --- 1
12109450 O-RING; ptfe --- 1
15* 15Y627 O-RING; ptfe 2 1
16 121112 SCREW, cap, socket-head; 1/4-20 x 5/8 in. (16 mm) 2 2
Maximum Fluid Working
Pressure 300 psi (2.1 MPa, 21 bar)
Wetted Parts 303 sst, tungsten carbide,
ptfe, acetal
Color Change Valves: see
manual 312782
Weight See page 7

Parts
312783G 9
High Pressure Color/Catalyst Valve Stacks - Series B
See the High Pressure Valve Part Quantity Chart -
Series B on page 10 to determine the quantity of
each part in your valve stack.
*Part included in Seal Kit 15U933 (purchase sepa-
rately). Kit includes additional parts; see Dispense
Valve manual 312782.
--- These parts are not available separately.
Technical Data, High Pressure Stacks
ti11666d
4
2
9
5*
1
612
10 12 8
7
14
11
3
Ref.
No. Part No. Description Qty
1 20A006 MANIFOLD, Bottom, Color
Change 1
2 20A004 MANIFOLD, Middle, Color
Change 
3 20A005 MANIFOLD, Top 
4 15X303 VALVE, High Pressure; includes
item 15; see manual 312782 
5* 15Y627 O-RING; PTFE, Size 116 
6 15T725 SEAT, Valve, High Pressure 
7 101970 PLUG, Pipe 
8 110004 O-RING; PTFE, Size 011 
9 121112 SCREW,cap,socket-head;1/4-20
x 5/8 in. (16mm) 
10 20A007 PLUG, Color Change 
11 16P656 FITTING, Outlet 1
12 111457 O-RING; PTFE, Size 012 
14 104893 O-RING; PTFE, Size 010 1
15 15T871 END CAP, Color Change (Assem-
bly 256995 only; not shown) 1
Maximum Fluid Working
Pressure 3000 psi (21 MPa, 210 bar)
Wetted Parts 303 sst, tungsten carbide,
ptfe
Color Change Valves: see
manual 312782
Weight See page 10

Parts
10 312783G
High Pressure Valve Part Quantity Chart - Series B
Find your Valve Stack Part No. in the left column and the desired reference number in the top row to find the part
quantity used in your valve stack.
Valve
Stack
Part No.
Reference Numbers Weight
lb (kg)234567891012
256995 0022221202 2.60 (1.18)
15V816 0133331214 5.05 (2.29)
256339 0 1 44441204 5.20(2.36)
15V8171155552416 7.65(3.47)
256341 1166662406 7.80 (3.54)
256342 217777361810.25 (4.65)
256343 2 1 8888360810.40(4.72)
256344 3 1 99994811012.85(5.83)
256345 3 1 10 10 10 10 4 8 0 10 13.00 (5.90)
256346 4 1 11 11 11 11 510 112 15.45 (7.01)
256347 4 1 12 12 12 12 5 10 0 12 15.60 (7.08)
256348 5 1 13 13 13 13 6 12 1 14 18.05 (8.19)
256349 5 1 14 14 14 14 612 014 18.20 (8.26)
256350 6 1 15 15 15 15 714 116 20.65 (9.37)
256351 6 1 16 16 16 16 7 14 0 16 20.80 (9.43)
256352 7 1 17 17 17 17 8 16 1 18 23.25 (10.55)
256353 7 1 18 18 18 18 816 018 23.40 (10.61)
256354 8 1 19 19 19 19 918 120 25.85 (11.73)
256355 8 1 20 20 20 20 9 18 0 20 26.00 (11.79)
256356 9 1 21 21 21 12 10 20 1 22 28.45 (12.90)
256357 9 1 22 22 22 22 10 20 022 28.60 (12.97)
256358 10 123 23 23 23 11 22 124 31.05 (14.08)
256359 10 1 24 24 24 24 11 22 0 24 31.20 (14.15)
256360 11 1 25 25 25 25 12 24 1 24 33.65 (15.26)
256361 11 126 26 26 26 12 24 026 33.80 (15.33)
256362 12 127 27 27 27 13 26 128 36.25 (16.44)
256363 12 1 28 28 28 28 13 26 0 28 36.40 (16.51)
256364 13 1 29 29 29 29 14 28 1 30 38.85 (17.62)
256365 13 130 30 30 30 14 28 030 39.00 (17.69)
256371 14 131 31 31 31 15 30 132 41.45 (18.80)