Page 1
INSTRUCTIONS–PARTS
This
manual contains important
warnings and information.
READ AND KEEP FOR REFERENCE.
INSTRUCTIONS
LIST
First
choice when
quality counts.
306–640
Supersedes D
Rev
. E
Back
Pressure V
alve
300 psi (21 bar, 2.1 MPa) Maximum Inbound Pressure
180 psi (12.4 bar, 1.24 MPa) Maximum Regulated Pressure
Model 205–122, Series C
Equipment
This equipment is for professional use only
Read all instruction manuals, tags, and labels before operating the equipment.
Use the equipment only for its intended purpose. If you are uncertain about usage, call your Graco
distributor.
Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
Check equipment daily
misuse can cause the equipment to rupture or malfunction and result in serious injury
.
. Repair or replace worn or damaged parts immediately
.
.
Do not exceed the maximum working pressure of the lowest rated component in your system. This
equipment has a 300 psi (21 bar, 2.1 MPa) maximum inbound pressure and a 180 psi (12.4 bar
1.24 MPa) maximum regulated pressure.
Use fluids and solvents which are compatible with the equipment wetted parts. Refer to the
nical Data
Comply with all applicable local, state, and national fire, electrical, and safety regulations.
section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.
PRESSURIZED EQUIPMENT HAZARD
Spray
from the gun, hose leaks, or ruptured components can splash fluid in the eyes or on the skin
and cause serious injury
Do not stop or deflect leaks with your hand, body
T
ighten all fluid connections before operating the equipment.
Follow the
sure; stop spraying; clean, check, or service the equipment; and install or clean the spray nozzle.
Pressure Relief Procedure
GRACO INC. P.O. BOX 1441
.
COPYRIGHT
Graco
Inc. is registered to I.S. EN ISO 9001
, glove or rag.
on page 2 whenever you: are instructed to relieve pres
MINNEAPOLIS, MN
1994, GRACO INC.
55440–1441
,
Tech-
-
Page 2
Pressure Relief Procedure.
WARNING
PRESSURIZED
The
system pressure must be manually relieved to
prevent the system from starting or spraying accidentally
o reduce the risk of an injury from accidental spray from
T
the gun, splashing fluid, or moving parts, follow the
Pressure Relief Procedure
are instructed to relieve the pressure,
stop spraying,
check or service any of the system equipment,
or install or clean the spray nozzle.
1.
Shut of
f the power to the pump. If you are using an air–
powered pump, open the bleed–type master air valve.
2. T
rigger the gun.
3.
Relieve the line pressure by turning the adjusting screw
(26) counterclockwise until there is no spring pressure.
EQUIPMENT HAZARD
.
whenever you:
Installation
This valve is used in a circulating system to regulate the back
pressure to spray guns and to maintain the proper circulating
pressure throughout the system.
22
Fig. 2
11
04520
Operation
The
back–pressure valve controls pressure in the fluid
return–line. Adjust the pump pressure and the back–pressure
valve for the best combination of spraying pressure and fluid
circulation.
o adjust the back–pressure valve, loosen the locknut (27)
T
and insert the hex key wrench (7) into the socket on the
adjusting screw (26). T
pressure in the return line. T
to decrease
ment by tightening the locknut (27).
pressure in the return line. Lock in the adjust
urn the screw
urn the screw counterclockwise
clockwise to increase
-
The valve is adjustable to control fluid pressure in a circulat
ing system from 0 to 180 psi (0 to 12.4 bar
, 0 to 1.24 MPa).
CAUTION
T
o prevent damage to the diaphragm, the hard carbide seat
and stem, and other sensitive parts, handle the valve care
fully.
Install the valve in the return line of the spray guns, down
stream from the last gun. See Fig. 1. Connect the return line
to the 3/8 npsm(m) inlet (22) and the 3/8 npsm(f) outlet (1
Be sure the connections match the direction of fluid flow in
the line. See Fig. 2.
B
A
-
1).
C
D
E
-
-
NOTE: Always check and adjust the back pressure valve if
you make changes to the system such as a change of fluids,
the length of the lines, and the number of spray guns.
Flush the valve with a compatible solvent whenever the rest
of the system is being flushed. Fully open the valve before
flushing by turning the adjustment screw counterclockwise.
Always use the lowest possible pressure when flushing.
Service
NOTE:
good working condition. Refer to the Parts drawing on page
3.
1.
2.
3. Unscrew the cap
4.
5.
F
Clean and check the valve regularly to maintain it in
Remove the valve from the system.
Disassemble the pressure gauge (5) and the tube (16)
from the inlet adapter (22). Remove the inlet adapter and
the outlet union (1
adjusting screw (26) and the locknut (27).
Remove the spring plate (15) and the spring (13).
Loosen the cap nut (4). Disassemble the diaphragm and
its related parts (2,10, 18, 19, 20, 21).
1) from the housing (25).
(28) from the housing (25). Remove the
Fig.
1
CAUTION
04521
Be careful not to damage the valve seat (1) or stem (2)
which are made of hard carbide.
Page 3
Service
6. Remove
housing (25).
7.
Clean all the parts with a compatible solvent. Check the
parts for wear or damage. Replace worn or damaged
parts.
Assemble the valve seat (1) and the gasket (9) into the
8.
housing (25). T
9.
Assemble the diaphragm and the related parts as shown
in the parts drawing. T
in–lb (3.1–3.7).
the valve seat (1) and the gasket (9) from the
orque to 70–80 in–lb (8–9 N.m).
orque the cap nut (4) to 27–33
to
Torque
1
15–125 in–lb
(13–14 N.m)
T
orque to
27–33 in–lb
(3.1–3.7 N.m)
T
orque to
70–80 in–lb
(8–9 N.m)
26
27
28
15
13
4
10
18
20
21
5
16
Parts
7
19
2
1
9
11
25
10.
Install the spring (13) and the spring plate (15).
11.
Screw the cap (28) onto the housing (25). T
1
15–125 in–lb (13–14 N.m). Reinstall the locknut (27)
and the adjusting screw (26) into the cap (28).
12.
Assemble the inlet adapter (22) and the outlet union (1
into the housing.
13.
Assemble the gauge (5) to the pressure tube (16). Use a
thread sealant to ensure a good seal. Install the tube and
the gauge into the inlet adapter (22).
14.
Install the valve in the system.
Ref.
No. Part No. Description Qty.
1 236–893 SEAT, valve 1
2 236–894 STEM, valve 1
4 100–529 NUT
5 187–876 PRESSURE GAUGE, 0–300 psi
7 101–976 WRENCH, hex key
9 189–817 GASKET
10 154–789 GASKET
11 155–665 UNION, 3/8 npt(m) x
13 157–796 SPRING, compression 1
15 160–180 PLA
16 160–745
18 189–816 PLATE, backup 1
19 177–430 GASKET, valve 1
20 177–432 DIAPHRAGM PLA
21 177–431 DIAPHRAGM 1
22 162–265
25 162–811 VALVE HOUSING 1
26 112–844 ADJUSTING SCREW
27 100–111 LOCKNUT
28 189–815 REGULATOR CAP 1
Keep these spare parts on hand to reduce down time.
, hex, cap, 5/16–18
(0–21 bar
3/8 npsm(f) swivel 1
TUBE, fluid gauge
INLET ADAPTER, 3/8–18 npsm(m),
3/8–18 npt(m), 1/4–18 npt(f)
1–5/8 inch long
, 0–2.1 MPa) pressure range
, 3/8”
, copper
, copper
TE, spring
TE, support
, 1/2–20
orque to
1)
, 1/2–20 x
1
1
1
1
1
1
1
1
1
1
1
22
Graco
Phone
Number
TO PLACE AN ORDER
call this number to identify the distributor closest to you:
1–800–367–4023 T
, contact your Graco distributor
oll Free
04519
, or
Manual
Change
Summary
Assembly
Changed
205–122
Series to C
Maximum inbound fluid pressure is increased to 300 psi (21
bar
, 2.1 MPa).
Part
Status
Old
New
Old
New
Ref
No.
1
1
5
5
Part
No.
212–030
236–893
101–180
187–876
Name
Seat
Seat
Gauge
Gauge
Page 4
Technical
Data
Dimensions
Maximum
Regulated
V
alve orifice diameter
Approximate
Wetted
inbound fluid pressure 300 psi (21 bar, 2.1 MPa)
pressure range
maximum
flow capacity
parts
.
. . . . . . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . .
brass,
nylon,
.
0–180 psi (0–12.4 bar
.
. . . . . . . . . . . . . .
303 stainless steel, plated steel
tungsten carbide, buna–N impregnated
PTFE,elastomer treated cellulose fiber
0.156 inch (3.96 mm)
2 gpm (7.6 liter/min)
, 1.24 MPa)
Height (A)
Width (C)
Fluid
Fluid
Diameter (E)
.
inlet (B)
outlet (D)
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . . . . . . . .
A
E
7 inch (178 mm)
5 inch (127 mm)
3/8 npsm(m)
3/8 npsm(f)
2.44 inch (51.28 mm)
D
B
C
The
Graco
warrants all equipment listed in this manual which is manufactured by Graco and bearing its name to be free from defects in
material
any
replace
operated
This
faulty installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or
substitution
Graco
installation,
This
verification
equipment
in
transportation.
Graco’s
remedy (including, but not limited to, incidental or consequential damages for lost
other incidental or consequential loss) shall be available. Any action for breach of warranty must be brought within two
date
GRACO
A PARTICULAR PURPOSE IN CONNECTION WITH ACCESSORIES, EQUIPMENT
NOT MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors, gas engines,
switches,
in
In
hereunder,
breach
and workmanship on the date of sale by an authorized Graco distributor to the original purchaser for use. With the exception
special extended or limited warranty published by Graco, Graco will,
any part of the equipment determined by Graco to be defective. This warranty applies only when the
and maintained in accordance with Graco’
warranty does not cover
of non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of
equipment with structures, accessories, equipment or materials not supplied by Graco, or the
operation or maintenance or structures, accessories, equipment or materials not supplied by Graco.
warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for
of the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The
will be returned to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect
material or
of sale.
making any claim for breach of these warranties.
no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment
workmanship, repairs will be made at a reasonable charge, which charges may include the costs of parts, labor
sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above.
MAKES NO W
hose, etc.), are subject to the warranty
or the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract,
of warranty
Graco Warranty and Disclaimers
for a period of twelve months from the date of sale, repair or
equipment is installed,
s written recommendations.
, and Graco shall not be liable
ARRANTY
, the negligence of Graco, or otherwise.
, AND DISCLAIMS ALL
, if any
for general wear and tear
IMPLIED W
, of their manufacturer
ARRANTIES OF MERCHANT
, or any malfunction, damage or wear caused by
improper design, manufacture,
The buyer agrees that no other
profits,
lost sales, injury to person or property
ABILITY AND FITNESS FOR
, MA
TERIALS OR COMPONENTS SOLD BUT
. Graco will provide purchaser with reasonable assistance
04520
(2)
years of the
of
, and
, or any
FOR
GRACO CANADA CUST
The
parties acknowledge that they have required that the present document, as well as all documents, notices and legal proceedings
entered into, given or instituted pursuant hereto or relating directly or indirectly hereto, be drawn up in English. Les parties
reconnaissent
judiciaires
All
written and visual data contained in this document reflects the latest product information available at the time of publication.
avoir convenu que la rédaction du présente document sera en Anglais,
exécutés, donnés ou intentés à la suite de ou en rapport, directement ou indirectement, avec les procédures concernées.
Foreign Offices:
GRACO INC. P.O. BOX 1441
OMERS
ainsi que tous documents, avis et procédures
Graco reserves the right to make changes at any time without notice.
Sales Offices:
Belgium, Canada, England, Korea, France, Germany
PRINTED
IN U.S.A. 306–640 October
Minneapolis, Detroit, Los Angeles
MINNEAPOLIS, MN
, 1958; Revised June, 1997
, Hong Kong, Japan
55440–1441
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