Instructions-Parts
Low Flow Fluid
Regulator
3A0427B
EN
Pneumatic controlled fluid regulator provides accurate, positive pressure control of
finishing coatings in low flow applications. For professional use only.
100 psi (0.7 MPa, 7 bar) Maximum Air Inlet Pressure
300 psi (2.1 MPa, 21 bar) Maximum Fluid Inlet Pressure
90 psi (0.63 MPa, 6.3 bar) Maximum Regulated
Fluid Pressure (High Pressure Port, All Models)
Part No. 24C375, Series A
1:1 Ratio, 90 psi (0.63 MPa, 6.3 bar) Maximum
Regulated Fluid Pressure (Low Pressure Port)
Part No. 24E471, Series A
1:2 Ratio, 50 psi (0.35 MPa, 3.5 bar) Maximum
Regulated Fluid Pressure (Low Pressure Port)
Part No. 24E472, Series A
1:3 Ratio, 30 psi (0.21 MPa, 2.1 bar) Maximum
Regulated Fluid Pressure (Low Pressure Port)
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
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Warnings
WARNING
PRESSURIZED EQUIPMENT HAZARD
Fluid from the gun/dispense valve, leaks, or ruptured components can splash in the eyes or on skin and
cause serious injury.
•
Follow the Pressure Relief Procedure when you stop spraying and before cleaning, checking, or
servicing equipment.
•
•
Tighten all fluid connections before operating the equipment.
Check hoses, tubes, and couplings daily. Replace worn or damaged parts immediately.
EQUIPMENT MISUSE HAZARD
Misuse can cause death or serious injury.
•
•
Do not operate the unit when fatigued or under the influence of drugs or alcohol.
Do not exceed the maximum working pressure or temperature rating of the lowest rated system com-
ponent. See Technical Data in all equipment manuals.
•
Use fluids and solvents that are compatible with equipment wetted parts. See Technical Data in all
equipment manuals. Read fluid and solvent manufacturer’s warnings. For complete information about
your material, request MSDS from distributor or retailer.
•
•
Do not leave the work area while equipment is energized or under pressure. Turn off all equipment
and follow the Pressure Relief Procedure when equipment is not in use.
Check equipment daily. Repair or replace worn or damaged parts immediately with genuine manufac-
turer’s replacement parts only.
•
•
•
•
•
•
Do not alter or modify equipment.
Use equipment only for its intended purpose. Call your distributor for information.
Route hoses and cables away from traffic areas, sharp edges, moving parts, and hot surfaces.
Do not kink or over bend hoses or use hoses to pull equipment.
Keep children and animals away from work area.
Comply with all applicable safety regulations.
TOXIC FLUID OR FUMES HAZARD
Toxic fluids or fumes can cause serious injury or death if splashed in the eyes or on skin, inhaled, or swal-
lowed.
•
•
Read MSDSs to know the specific hazards of the fluids you are using.
Store hazardous fluid in approved containers, and dispose of it according to applicable guidelines.
PERSONAL PROTECTIVE EQUIPMENT
You must wear appropriate protective equipment when operating, servicing, or when in the operating area
of the equipment to help protect you from serious injury, including eye injury, hearing loss, inhalation of
toxic fumes, and burns. This equipment includes but is not limited to:
•
•
Protective eyewear, and hearing protection.
Respirators, protective clothing, and gloves as recommended by the fluid and solvent manufacturer.
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Installation
Installation
Mount the Fluid Regulator
Regulated Fluid Outlet Line
close to the fluid dispense device. A mounting bracket
ing information.
between the 1/8 npt(f) fluid outlet port and the system’s
fluid dispense point.
NOTE: All components located downstream of the fluid
regulator must be rated for the maximum fluid inlet pres-
sure sent to the regulator. Do not use the regulator as a
fluid shutoff valve.
Grounding
Flush Before Using Equipment
The equipment must be grounded. Mount the regulator
to a conductive mounting surface (E) which is con-
nected to a true earth ground. Follow local code. Graco
Part No. 222011 Ground Wire and Clamp is available as
The equipment was tested with a rust inhibiting test
fluid. To avoid contaminating your system, flush the
equipment with a compatible solvent before using the
Air Supply
The regulator’s air inlet fittings accept 5/32 in. (4 mm)
OD tubing. Air pressure can be controlled manually or
with electronic pressure controls.
Connections can be made in two ways:
•
•
Use separate high (A) and low (B) air pressure sup-
Use a single air supply line and connect it to the
high or low pressure air inlet fitting alternately, as
desired.
Fluid Inlet Line
1/4 npt(m) fluid inlet fitting and the fluid supply.
Install the following accessories in the order shown in
•
•
Fluid filter (H): to filter particles from the fluid
before it passes through the fluid regulator.
Fluid drain valve (J): required in your system, to
relieve fluid pressure in the fluid regulator.
•
Fluid shutoff valve (K): shuts off fluid flow.
4
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Installation
Pilot air signals from a
manual air regulator or
electronic air control
B
A
F
C
L
To fluid dispense point
D
E
K
From fluid supply
H
J
G
TI15498a
FIG. 1: Typical Installation
Key:
A
B
C
D
E
F
G
H
J
Air Supply Line to High Port
Air Supply Line to Low Port
Low Flow Fluid Regulator
Mounting Bracket (supplied)
Grounded Mounting Surface
Regulated Fluid Outlet Line
Fluid Inlet Supply Line
Fluid Filter
Fluid Drain Valve (required)
Fluid Shutoff Valve
Ground Wire and Clamp (Part No. 222011)
K
L
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Installation
6
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Operation
Operation
Pressure Relief Procedure
High Port Operation
Use the high port for:
•
•
commanding a higher pressure for faster flushing
higher fluid viscosities
1. Shut off the fluid supply.
To operate, shut off the air to the low pressure inlet and
turn on the air to the high pressure inlet.
2. Leave on the air to the fluid regulator.
3. Trigger the gun to relieve the fluid pressure.
4. Shut off the air supply to the fluid regulator.
Low Port Operation
Use the low port for:
5. Open the fluid drain valve to relieve all fluid pres-
sure, having a container ready to catch the drain-
age.
•
•
precise control in critical applications
lower fluid viscosities
To operate, shut off the air to the high pressure inlet and
turn on the air to the low pressure inlet.
Available Pressures
This fluid regulator provides accurate, positive fluid
pressure control to a spray gun or other device. The reg-
ulated fluid outlet pressure is proportional to the pilot air
signal supplied to either the high or low air inlet port.
Each port can be controlled independently.
Adjust the Fluid Regulator
The fluid regulator controls pressure downstream from
its outlet. Set the inlet fluid pressure at least 10 psi (.07
MPa, 0.7 bar) higher than the regulated outlet fluid pres-
sure.
All three models have the high pressure port, which is
fixed at 1:1. Ratios of 1:1, 1:2, and 1:3 are available for
color coded to indicate ratio:
Apply a pilot air signal to either the high or low port. The
minimum air pressure depends on the ratio. See the
•
•
•
Silver (1:1 ratio)
Green (1:2 ratio)
Black (1:3 ratio)
If using an accessory fluid pressure gauge, trigger the
air spray gun to relieve pressure in the line when reduc-
ing the pressure, to ensure a correct gauge reading.
determine which ratio is best for your application. Per-
formance is affected by:
Flushing
•
•
•
•
Fluid inlet pressure
Fluid viscosity
Size (ID) and length of the regulated fluid outlet line
Size (ID) and length of the fluid inlet supply line.
•
Flush before changing colors, at the end of the day,
before storing, and before repairing the equipment.
•
Flush with a fluid that is compatible with the fluid you
are pumping and with the wetted parts of your sys-
tem. Check with your fluid manufacturer or supplier
for recommended flushing fluids and flushing fre-
quency. Relieve the pressure after flushing.
•
Do not allow paint or solvent to sit in the system for
extended periods.
3A0427B
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Troubleshooting
Troubleshooting
Problem
No fluid flow.
Cause
Plugged fluid inlet.
Solution
Flush fluid line and regulator.
Exhausted fluid supply.
Check fluid supply and supply
pump.
No air inlet pressure.
Check air inlet pressure.
Replace. See page 10.
Ruptured air diaphragm (15).
Low fluid flow.
Incorrect ratio.
Use correct spacer (3) and ratio pis-
ton (14) for desired ratio. See
Fluid supply pressure is too low.
Increase fluid pressure. Do not
exceed 300 psi (2.1 MPa, 21 bar).
Air inlet pressure is too low.
Incorrect ratio.
Increase air inlet pressure.
High fluid flow.
Use correct spacer (3) and ratio pis-
ton (14) for desired ratio. See
Air inlet pressure is too high.
Decrease air inlet pressure.
Erratic fluid flow.
Inconsistent air inlet pressure.
Inconsistent fluid inlet pressure.
Check air inlet pressure.
Check fluid inlet pressure.
8
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Troubleshooting
Problem
Cause
Solution
Fluid flow will not shut off.
Dirty needle (6) and seat (5).
Remove and clean. Replace if worn
or damaged. See page 10.
Inlet air is not shut off.
Seat retainer (7) is loose.
Broken spring (13).
Shut off inlet air.
Tighten.
Regulator is leaking fluid.
Regulator is leaking air.
Screws (17) are loose.
Torque oppositely and alternately to
25 in-lb (2.8 N•m).
Loose fluid fitting.
Loose air fitting.
Tighten.
Tighten.
Screws (17) are loose.
Torque oppositely and alternately to
25 in-lb (2.8 N•m).
Ruptured air diaphragm (15).
Replace. See page 10.
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Repair
Repair
2. Insert the needle (6◆) in the fluid chamber housing
(1). Hold in place with a screwdriver or allen wrench.
Install the fluid chamber piston (8), o-ring (11*), ptfe
diaphragm (9a*), and nylon/buna-N diaphragm
(9b*).
Disassembly
1. Flush the regulator with a compatible solvent. See
page 7.
3. Apply thread sealant to the threads of the needle
(6). Screw the air chamber piston (10) onto the nee-
dle. Align the holes in the diaphragms before tight-
ening. Tighten using a screwdriver in the slot of the
needle.
3. Disconnect the air and fluid lines from the regulator.
Remove the regulator for repair.
5. Remove five screws (17), the air chamber cover (4),
air diaphragm (15), spacer (3), and gasket (29).
4. Install the air chamber housing (2). Align the holes
in the housing with the holes in the diaphragms (9a,
9b) and fluid chamber housing (1).
6. Unscrew the ratio piston (14). Remove the spring
(13) and air chamber housing (2).
5. Install the spring (13). Screw the ratio piston (14)
into the air chamber piston (10).
7. Insert a standard screwdriver into the fluid inlet of
the regulator and hold the regulator needle (6)
steady. Unscrew the air chamber piston (10).
6. Install the gasket (29*), spacer (3), air diaphragm
(15*), and air chamber cover (4). Align the holes.
Install five screws (17). Torque oppositely and alter-
nately to 25 in-lb (2.8 N•m).
8. Remove the fluid diaphragms (9a, 9b), o-ring (11),
and fluid chamber piston (8). Push the needle (6)
out of the fluid chamber housing (1) inlet port.
7. Apply pipe sealant and install the fluid inlet fitting
(20).
9. Using a 5/16 allen wrench, unscrew the seat
retainer (7) and seat (5) from the fluid chamber
housing (1).
8. Reinstall the fluid regulator in the system.
10. Clean all parts and inspect for damage.
Change the Ratio
Ratio Kits 24E501, 24E502, and 24E503 are available
marked with a symbol, for example 3†. The kits include
a spacer (3†) and piston (14†). The ratio spacer is color
coded to indicate ratio:
Reassembly
order. Kit parts are marked with an asterisk, for example
9a*. For the best results use all parts in the kit.
•
•
•
Silver (1:1 Ratio Kit 24E501)
Green (1:2 Ratio Kit 24E502)
Black (1:3 Ratio Kit 24E503)
NOTE: Seat Repair Kit 24F140 is available. See page
12 to order. Kit parts are marked with a symbol, for
example 7◆. For the best results use all parts in the kit.
To install the kit, disassemble the regulator (see page
10). Replace the existing spacer (3) and ratio piston (14)
with the desired size, and reassemble. Do not mix spac-
ers and pistons of different sizes.
1. Using a 5/16 allen wrench, screw the seat retainer
(7*◆) and seat (5*◆) into the fluid chamber housing
(1).
NOTE: The white ptfe diaphragm (9a*) must always
face the fluid. Install the white ptfe diaphragm first, fol-
lowed by the black nylon/buna-N diaphragm (9b*).
10
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Repair
1
2
3
4
Torque oppositely and alternately to 25 in-lb (2.8 N•m).
Apply thread sealant.
Apply pipe sealant.
10
White PTFE diaphragm (9a) must always face the fluid.
*9b (nylon/buna-N)
*9a (ptfe)
11*
4
8
1
5*◆
6◆
2
26
7◆
3
20
17
1
4
15*†
3†
29*
14†
13
27
TI15290a
2
FIG. 2. Regulator Assembly
3A0427B
11
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Parts
Parts
24C375 1:1 Ratio Fluid Regulator, Series A
24E471 1:2 Ratio Fluid Regulator, Series A
24E472 1:3 Ratio Fluid Regulator, Series A
Ref.
Ref.
No. Part No. Description
Qty.
No. Part No. Description
Qty.
19
n/a
KIT, bracket, regulator; includes
items 19a and 19b
SCREW, cap, socket hd; 8-32 x 1/2
in. (13 mm)
1
1
2
3†
n/a
n/a
n/a
HOUSING, fluid chamber
HOUSING, air chamber
SPACER, ratio, 1:1, silver (24C375
only)
1
1
1
19a n/a
2
19b n/a
NUT, hex; 1-12 unf-2B
FITTING, fluid inlet; 1/4 npt x 3/8
npt; sst
ELBOW, tube, air; 10-32(m) x 5/32
in. (4 mm) OD tube
CONNECTOR, tube, air; 10-32(m)
x 5/32 in. (4 mm) OD tube
GASKET, cellulose fiber
1
1
n/a
n/a
n/a
SPACER, ratio, 1:2, green (24E471
only)
SPACER, ratio, 1:3, black (24E472
only)
COVER, air chamber
SEAT, regulator
1
1
20
26
27
29*
*
n/a
n/a
n/a
n/a
1
1
1
4
1
1
1
1
1
1
1
5*◆ n/a
6◆
7◆
8
9a*
9b*
n/a
n/a
NEEDLE, regulator
RETAINER, seat
16A585 PISTON, fluid chamber
n/a
n/a
DIAPHRAGM, fluid; ptfe (white)
DIAPHRAGM, fluid; nylon/buna-N
(black)
Parts included in Rebuild Kit 24E504 (purchase sep-
arately).
† Parts included in Ratio Kits (purchase separately):
24E501, 1:1 Ratio (silver spacer)
10
11*
13
16A586 PISTON, air chamber
n/a O-RING; perfluoroelastomer
16E537 SPRING, compression; sst
1
1
1
1
1
1
1
5
24E502, 1:2 Ratio (green spacer)
24E503, 1:3 Ratio (black spacer)
14† n/a
n/a
n/a
15*† n/a
PISTON, ratio, 1:1 (24C375 only)
PISTON, ratio, 1:2 (24E471 only)
PISTON, ratio, 1:3 (24E472 only)
DIAPHRAGM, air; buna-N
◆ Parts included in Seat Kit 24F140 (purchase sepa-
rately).
17
n/a
SCREW, cap, socket hd; 8-32 x 1
in. (25 mm); sst
12
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Parts
10
*9b (nylon/buna-N)
*9a (ptfe)
11*
8
1
5*◆
6◆
26
7◆
20
17
4
15*†
3†
29*
14†
13
TI15290a
27
2
19
19a
19b
See parts breakdown above
TI15289a
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Technical Data
Technical Data
Maximum air inlet pressure . . . . . . . . . . . . . . . . . . . . . . 100 psi (0.7 MPa, 7 bar)
Maximum fluid inlet pressure. . . . . . . . . . . . . . . . . . . . . 300 psi (2.1 MPa, 21 bar)
Maximum regulated fluid pressure (high pressure port)
All Models . . . . . . . . . . . . . . 90 psi (0.63 MPa, 6.3 bar)
Maximum regulated fluid pressure (low pressure port) . Model 24C375. . . . . . . . . . . 90 psi (0.63 MPa, 6.3 bar)
Model 24E471 . . . . . . . . . . . 50 psi (0.35 MPa, 3.5 bar)
Model 24E472 . . . . . . . . . . . 30 psi (0.21 MPa, 2.1 bar)
Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Model 24C375. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1:1
Model 24E471 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1:2
Model 24E472 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1:3
Maximum fluid temperature . . . . . . . . . . . . . . . . . . . . . . 120°F (49°C)
Wetted parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303 and 17-4 PH grades of stainless steel, ptfe, perfluo-
roelastomer
Fluid Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/4 npt(m)
Fluid Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/8 npt(f)
Low Pressure Air Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . 5/32 in. (4 mm) OD tube fitting
High Pressure Air Inlet. . . . . . . . . . . . . . . . . . . . . . . . . . 5/32 in. (4 mm) OD tube fitting
3A0427B
15
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Performance Data
Performance Data
Use the following charts to choose the best ratio for your
application, depending on the desired fluid pressure
range and pressure losses due to flow rate, fluid viscos-
ity, and fluid line size.
•
•
A higher ratio (1:3) will have a flatter response curve
and will not react as strongly to changes in the air
pilot signal.
A lower ratio (1:1) will have a steeper response
curve but will cover a wider range of fluid pressure.
The ratio determines the fluid pressure to air pressure
response curve:
psi
(MPa, bar)
90
(0.63, 6.3)
80
(0.56, 5.6)
1:1 Ratio,
Low Port
70
(0.49, 4.9)
1:1 Ratio,
High Port
60
(0.42, 4.2)
50
(0.35, 3.5)
40
(0.28, 2.8)
1:2 Ratio
1:3 Ratio
30
(0.21, 2.1)
20
(0.14, 1.4)
10
(0.07, 0.7)
0
psi
(MPa, bar)
0
20
40
(0.28, 2.8)
60
80
100
(0.7, 7.0)
(0.14, 1.4)
(0.42, 4.2)
(0.56, 5.6)
Pilot Air Pressure
16
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Performance Data
1100
1000
900
800
700
600
500
1:1 Ratio,
25 centipoise
1:1 Ratio,
75 centipoise
1:2 Ratio,
25 centipoise
1:3 Ratio,
25 centipoise
1:2 Ratio,
75 centipoise
400
300
200
1:3 Ratio,
75 centipoise
100
0
psi
(MPa, bar)
0
20
40
(0.28, 2.8)
60
80
(0.56, 5.6)
100
(0.7, 7.0)
(0.14, 1.4)
(0.42, 4.2)
Pilot Air Pressure
NOTE: Tested using a 1.0 mm nozzle and 10 ft x 1/4 in. ID (3.05 m x 6 mm) fluid line.
3A0427B
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Graco Standard Warranty
Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in
material and workmanship on the date of sale to the original purchaser for use. With the exception of any special, extended, or limited warranty
published by Graco, Graco will, for a period of twelve months from the date of sale, repair or replace any part of the equipment determined by
Graco to be defective. This warranty applies only when the equipment is installed, operated and maintained in accordance with Graco’s written
recommendations.
This warranty does not cover, and Graco shall not be liable for general wear and tear, or any malfunction, damage or wear caused by faulty
installation, misapplication, abrasion, corrosion, inadequate or improper maintenance, negligence, accident, tampering, or substitution of
non-Graco component parts. Nor shall Graco be liable for malfunction, damage or wear caused by the incompatibility of Graco equipment with
structures, accessories, equipment or materials not supplied by Graco, or the improper design, manufacture, installation, operation or
maintenance of structures, accessories, equipment or materials not supplied by Graco.
This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of
the claimed defect. If the claimed defect is verified, Graco will repair or replace free of charge any defective parts. The equipment will be returned
to the original purchaser transportation prepaid. If inspection of the equipment does not disclose any defect in material or workmanship, repairs
will be made at a reasonable charge, which charges may include the costs of parts, labor, and transportation.
THIS WARRANTY IS EXCLUSIVE, AND IS IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO WARRANTY OF MERCHANTABILITY OR WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.
Graco’s sole obligation and buyer’s sole remedy for any breach of warranty shall be as set forth above. The buyer agrees that no other remedy
(including, but not limited to, incidental or consequential damages for lost profits, lost sales, injury to person or property, or any other incidental or
consequential loss) shall be available. Any action for breach of warranty must be brought within two (2) years of the date of sale.
GRACO MAKES NO WARRANTY, AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE, IN CONNECTION WITH ACCESSORIES, EQUIPMENT, MATERIALS OR COMPONENTS SOLD BUT NOT
MANUFACTURED BY GRACO. These items sold, but not manufactured by Graco (such as electric motors, switches, hose, etc.), are subject to
the warranty, if any, of their manufacturer. Graco will provide purchaser with reasonable assistance in making any claim for breach of these
warranties.
In no event will Graco be liable for indirect, incidental, special or consequential damages resulting from Graco supplying equipment hereunder, or
the furnishing, performance, or use of any products or other goods sold hereto, whether due to a breach of contract, breach of warranty, the
negligence of Graco, or otherwise.
FOR GRACO CANADA CUSTOMERS
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 avoir convenu que la
rédaction du présente document sera en Anglais, ainsi que tous documents, avis et procédures judiciaires exécutés, donnés ou intentés, à la suite
de ou en rapport, directement ou indirectement, avec les procédures concernées.
Graco Information
TO PLACE AN ORDER, contact your Graco distributor or call to identify the nearest distributor.
Phone: 612-623-6921 or Toll Free: 1-800-328-0211 Fax: 612-378-3505
All written and visual data contained in this document reflects the latest product information available at the time of publication.
Graco reserves the right to make changes at any time without notice.
This manual contains English. MM 3A0427
Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
GRACO INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA
Copyright 2010, Graco Inc. All Graco manufacturing locations are registered to ISO 9001.
Revision B, February, 2014
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