Instructions/Parts List
Low Pressure
Fluid Regulators
Important Safety Instructions
Read all warnings and instructions in this manual.
Save these instructions.
309474K
EN
Model 233757 Shown
II 2 G
Contents
List of Models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Back Pressure Regulators . . . . . . . . . . . . . . . . . 6
Fluid Pressure Regulators . . . . . . . . . . . . . . . . . 6
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Flush Before First Use . . . . . . . . . . . . . . . . . . . 11
Pressure Relief Procedure . . . . . . . . . . . . . . . . 11
Adjusting the Regulator . . . . . . . . . . . . . . . . . . . 11
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Flushing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Cleaning and Repair . . . . . . . . . . . . . . . . . . . . . 13
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Mechanical Fluid Pressure Regulators
Part Nos. 233759 and 234267 . . . . . . . . . . 14
Mechanical Back Pressure Regulators
Part Nos. 233812 and 234258 . . . . . . . . . . 15
Manual Conventions
Mechanical Fluid Pressure Regulators
Part Nos. 233757, 233774, 234263, and
234273 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Mechanical Back Pressure Regulators
Part Nos. 233758, 233811, 233950, 234255,
234261, and 234262 . . . . . . . . . . . . . . . . . . 17
Pneumatic Fluid Pressure Regulators
Part Nos. 233773, 233809, 234272, and
234256 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Pneumatic Back Pressure Regulators
Part Nos. 233810 and 234257 . . . . . . . . . . 19
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Accessory Gauges . . . . . . . . . . . . . . . . . . . . . . . . . 21
Flow Rate Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Mounting Dimensions . . . . . . . . . . . . . . . . . . . . . . 22
Graco Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Warning
WARNING
A warning alerts you to the possibility of serious injury
or death if you do not follow the instructions.
Symbols, such as fire and explosion (shown above),
alert you to a specific hazard and direct you to read
the indicated hazard warnings (pages 4-5) for detailed
information.
Caution
CAUTION
A caution alerts you to the possibility of damage to or
destruction of equipment if you do not follow the
instructions.
2 309474K
List of Models
List of Models
Fluid Pressure Regulators
Part No. Series Model Type Maximum Fluid Inlet Pressure Regulated Pressure Range
233757
234263BB
233759
234267BB
233773
234272BB
233774
234273BB
233809
234256BB
Back Pressure Regulators
Part No. Series Model Type
233758
234262BB
233810
234257BB
233811
234255BB
233812
234258BB
233950
234261BB
P20-VM
P20-VM npt
P50-VM
P50-VM npt
P10-VP
P10-VP npt
P10-VM
P10-VM npt
P10-VP, OEM
P10-VP, OEM npt
P10-RM
P10-RM npt
P10-RP
P10-RP npt
P20-RM DN13
P20-RM DN13 npt
P50-RM
P50-RM npt
P20-RM DN1
P20-RM DN1 npt
Mechanical,
fluid pressure
Mechanical,
fluid pressure
Pneumatic,
fluid pressure
Mechanical,
fluid pressure
Pneumatic,
fluid pressure
Mechanical,
back pressure
Pneumatic,
back pressure
Mechanical,
back pressure
Mechanical,
back pressure
Mechanical,
back pressure
580 psi (4000 kPa, 40 bar) 15-290 psi
(100-2000 kPa, 1-20 bar)
1015 psi (7000 kPa, 70 bar) 145-725 psi
(1000-5000 kPa, 10-50 bar)
580 psi (4000 kPa, 40 bar) 6-145 psi
(40-1000 kPa, 0.4-10 bar)
580 psi (4000 kPa, 40 bar) 15-145 psi
(100-1000 kPa, 1-10 bar)
580 psi (4000 kPa, 40 bar) 6-145 psi
40-1000 kPa, 0.4-10 bar)
Maximum Permanent Supply
Pressure
145 psi (1000 kPa, 10 bar) 15-145 psi
145 psi (1000 kPa, 10 bar) 15-145 psi
290 psi (2000 kPa, 20 bar) 29-290 psi
725 psi (5000 kPa, 50 bar) 73-725 psi
290 psi (2000 kPa, 20 bar) 15-290 psi
Regulated Pressure Range
(100-1000 kPa, 1-10 bar)
(100-1000 kPa, 1-10 bar)
(200-2000 kPa, 2-20 bar)
(500-5000 kPa, 5-50 bar)
(100-2000 kPa, 1-20 bar)
Key to Model Designation
Pressure regulation valve e.g. P20- R M DN13 npt
npt version
Valve Seat Orifice 13mm
Operating Mode P - pneumatic
M - mechanical
Action V - pressure regulation
R - back-pressure regulation
Regulation max 20 bar
309474K 3
Warning
WARNING
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.
• 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 not sure, call your Graco distributor.
• Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
• Check equipment daily. Repair or replace worn or damaged parts immediately.
• Do not exceed the maximum working pressure of the lowest rated system component. Refer to the
Technical Data on page 20 for the maximum working pressure of this equipment.
• Use fluids and solvents which are compatible with the equipment wetted parts. Refer to the Techni-
cal Data section of all equipment manuals. Read the fluid and solvent manufacturer's warnings.
• Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 180°F (82°C) or below -40°F (-40°C).
• Wear hearing protection when operating this equipment.
• Never use 1,1, 1-trichloroethane, methylene chloride, other halogenated hydrocarbon solvents or
fluids containing such solvents in pressurized aluminum equipment. Such use could result in a
chemical reaction, with the possibility of explosion.
• Comply with all applicable local, state, and national fire, electrical, and safety regulations.
4 309474K
Warning
WARNING
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 point the gun at anyone or at any parts of the body.
• Do not stop or deflect leaks with your hand, body, glove, or rag.
•Follow the Pressure Relief Procedure on page 11 whenever you are instructed to relieve pressure;
stop spraying; clean, check, or repair the equipment; and install or clean the spray nozzle.
• Tighten all fluid connections before operating the equipment.
• Check the hoses, tubes, and couplings daily. Replace worn, damaged, or loose parts immediately.
Permanently coupled hoses cannot be repaired; replace the entire hose.
TOXIC FLUID HAZARD
Hazardous fluid or toxic fumes can cause serious injury or death if splashed in the eyes or on the skin,
inhaled, or swallowed.
• Know the specific hazards of the fluid you are using. Read the fluid manufacturer’s warnings.
• Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
• Always wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer.
309474K 5
Introduction
Introduction
A fluid pressure regulator is used in air spray systems to
ensure accurate, positive control of fluid pressure to an
air spray gun or to a low pressure dispensing valve or
atomizing head.
A regulator installed at a circulating line take-off or pump
reduces main line pressure to maintain the desired fluid
pressure to the air spray gun or to a low pressure dispensing valve or atomizing head.
Back Pressure Regulators
Models 233810, 233811, 233812, 233950, 234255,
234257, 234258, 233758, 234261, and 234262, are
back pressure regulators that limit the supply pressure
to a set value by opening an outlet and guiding back
excess material when the predetermined pressure has
been achieved. These valves are used in circulating
systems. Model 233810 pneumatic back pressure regulator is shown in F
IG
. 1.
Fluid Pressure Regulators
Models 233757, 233759, 233774, 234263, 234267, and
234273 (F
sure regulators designed primarily for use with low to
medium viscosity fluids.
Models 233773, 233809, 234256, and 234272 (F
are pneumatically operated fluid pressure regulators
designed primarily for use with highly viscous coatings.
IG
. 2.) are mechanically operated fluid pres-
IG
. 3.)
Fluid Inlet
(from gun)
Fig. 1. Cutaway of Pneumatic Back Pressure Regulator
Air inlet
Valve plunger
TI1773A
Piston
Diaphragm
Fluid Outlet
(return line)
6 309474K
Adjustment screw
Spring
Introduction
Fluid Inlet
(from pump)
Valve ball and seat
TI1772A
Fig. 2. Cutaway of Mechanical Fluid Pressure Regulator
Valve plunger
Air inlet
Diaphragm
Fluid Outlet
(to gun)
TI1772B
Fluid Inlet
(from pump)
Diaphragm
Fluid Outlet
(to gun)
Valve ball and seat
TI1771A
Valve plunger
TI1771B
Fig. 3. Cutaway of Pneumatic Fluid Pressure Regulator
309474K 7
Installation
Installation
1. Install one regulator for each spray gun.
2. Apply thread sealant to connections as necessary.
3. Make sure that the direction of fluid flow agrees with
the flow direction markings on the regulator body.
a. Install a fluid pressure regulator
gun: Connect the fluid line from the pump to the
inlet of the fluid regulator. Connect the fluid line
to the gun to the regulator’s outlet.
F
upstream
of the
B
b. Install a back pressure regulator
the gun. Connect the fluid return line from the
gun to the inlet of the back pressure regulator.
Connect the fluid return line to the pump to the
regulator’s outlet.
4. Flush and test the entire system.
F
IG
. 4., FIG. 5., and FIG. 6. show possible configurations
for installing a system. They do not depict actual system
designs. Consult your Graco distributor for assistance in
designing a system that meets your specific requirements.
A
Air to pump
downstream
of
C
Air to gun
Fluid
Fig. 4. Low pressure, non-circulating system, mechanical fluid regulator
Key
A Air line filter
B Bleed-type air shut-off valve
C Air regulator for pump and gun
DPump
B
Y
DE
E Fluid regulator
F Air spray gun
Y Pump ground wire
TI1767A
8 309474K
Installation
A
B
G
AB
F
Air to Fluid
Regulator
C
B
Air to
Gun
F
l
u
i
d
Y
E
D
Fig. 5. Low pressure, non-circulating system, pneumatic fluid regulator
Air to
Pump
TI1766A
Key
E Fluid regulator
A Air line filter
B Bleed-type air shut-off valve
C Air regulator for pump and gun
F Air spray gun
G Air regulator for fluid regulator
Y Pump ground wire
DPump
309474K 9
Installation
A
A
A
Air
B
B
C
B
KG
Fluid
F
Air to
gun
Air to Fluid
Regulator
Fluid
Air to Back
Pressure
Regulator
E
H
J
Fluid
to gun
Fluid return from gun
Fig. 6. Low Pressure circulating system, pneumatic fluid regulator and back pressure regulator
Key
G Air regulator for fluid regulator
A Air line filter
B Bleed-type air shut-off valve
C Air regulator for pump and gun
E Fluid regulator
H Fluid shutoff valve
J Back pressure regulator
K Air regulator for back pressure regulator
Y Pump ground wire
F Air spray gun
TI1768A
10 309474K
Operation
Operation
Flush Before First Use
Your pressure regulator has been tested in the factory
with an anti-corrosion liquid. Before using the regulator,
thoroughly flush the system with a solvent to remove
residue of this liquid as well as any contaminants that
have been introduced during assembly of the system.
Pressure Relief Procedure
WARNING
Read the warnings on page 5, and follow the Pressure
Relief Procedure below whenever you:
• are instructed to relieve pressure
• stop spraying
• check or service any of the equipment
• install or clean the fluid nozzle.
1. Shut off the air to the pump.
Mechanical Regulator
1. Back out the adjustment screw until there is no
spring pressure.
2. Turn on the fluid supply, to admit fluid to the regulator.
3. Turn the screw clockwise to adjust fluid pressure to
the desired level.
Pneumatic Regulator
1. With the fluid supply shut off, turn on the air pressure to the regulator.
2. Turn on the fluid supply, to admit fluid to the regulator.
3. Increase the fluid inlet pressure. When the fluid outlet pressure is at the desired level, shut off the air to
the fluid regulator.
2. Trigger the air spray gun to relieve the fluid pressure.
3. Open the fluid drain valve to relieve all fluid pressure, having a container ready to catch the drainage.
Adjusting the Regulator
The fluid pressure regulator controls pressure downstream from its outlet. The inlet fluid pressure should
always be higher than the outlet fluid pressure.
If you are using an accessory fluid pressure gauge, trigger the air spray gun to relieve pressure in the line when
reducing the pressure, to ensure a correct gauge reading.
Adjust the pump air pressure and the fluid pressure regulator for the best spraying combination.
In a circulating system, the back pressure valve controls
the fluid pressure upstream of its inlet in the same way.
309474K 11
Troubleshooting
Troubleshooting
Relieve the pressure (page 11) before checking or repairing the equipment.
To repair the regulator, refer to page 13.
Problem Cause Solution
Drop in fluid outlet pressure. Ruptured diaphragm (15). Replace diaphragm.
Air escaping (pneumatic regulators
only).
Fluid outlet pressure increases to
level of fluid inlet pressure.
Fluid leaking from upper housing. Ruptured diaphragm (15). Replace diaphragm.
Valve ball (5) and seat (2) are worn
or stuck open.
Check air hose and connections.
Replace piston seal (21).
Clean ball and seat. Replace worn or
damaged parts.
12 309474K
Maintenance
Maintenance
Flushing
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 system.
Check with your fluid manufacturer or supplier for recommended flushing fluids and flushing frequency.
Relieve the pressure after flushing.
Do not allow paint or solvent to sit in the system for
extended periods. Fluid could dry in the regulator and
cause leakage. If leakage occurs, relieve pressure, then
disassemble and clean the regulator.
Cleaning and Repair
When changing fluids or colors, the regulator should be
disassembled and cleaned. Regular cleaning and
inspection of the internal parts is necessary to keep the
fluid regulator working properly.
1. Relieve all air and fluid pressure in the system.
2. Remove the regulator from the system.
3. Disassemble the regulator (see the parts drawings
on pages 14 through 19).
4. Clean and inspect all parts.
CAUTION
Be very careful when handling the carbide balls and
seats. Damage will cause poor operation and leakage.
5. Inspect the diaphragm, packings, o-rings, and seals
for wear. Check the ball and seat for nicks, wear, or
other damage.
6. Lubricate packings, o-rings and seals when reassembling the regulator.
309474K 13
Parts
Parts
Mechanical Fluid Pressure Regulators
Part Nos. 233759 and 234267
25
1
28
27
3
26
17
15
14
6
10
24
5
22
21
13
12
20
19
11
2
18
23
9
16
Ref.
No. Part No. Description
1 HOUSING, lower, for 233759 1
HOUSING, lower, for 234267 1
2 245368 SEAT, valve 1
3 15Y036 O-RING 1
4 15Y035 O-RING 2
5 117106 BALL, 6 mm, carbide 1
6 15A205 SUPPORT, ball 1
7 117090 SPRING, compression 1
8 15A144 COVER 1
9 117123 SCREW, fhms, M4x10 2
10 15A219 RING, for non-npt model 233759
only
11 117101 PLUG, threaded 2
12 117085 SEAL, ring 1
13 117099 PLUG, threaded 1
Qty
2
3
4
1
10
5
5
6
7
4
8
TI1753A
1
Torque to 6 N•m (53 in-lb).
2
Torque to 2 N•m (18 in-lb).
3
Fill internal cavity with grease.
5
Used only on non-npt model 233759.
6
Torque to 5 N•m (44in-lb).
Ref.
No. Part No. Description
14 245372 PLUNGER, valve 1
15 15A179 DIAPHRAGM 1
16 15A173 CAP, spring 1
17 117122 NUT, seal-lock 1
18 15A175 PLATE, spring, bottom 1
19 117096 SPRING, compression 1
20 117092 SPRING, compression 1
21 15A176 PLATE, spring, top 1
22 117105 BALL, 6 mm 1
23 15A186 PACKING, PTFE with carbon 1
24 245366 HOUSING, upper 1
2
25 117129 SCREW, shcs, M5x80 8
26 117017 WASHER 8
27 15A141 BONNET, cover 1
28 15A242 SCREW, custom 1
Qty
14 309474K
Mechanical Back Pressure Regulators
Part Nos. 233812 and 234258
25
1
28
27
3
26
17
15
14
Parts
6
10
24
5
22
21
13
12
20
19
11
2
18
23
9
16
Ref.
No. Part No. Description
1 HOUSING, lower, for 233812 1
HOUSING, lower, for 234258 1
2 245369 SEAT, valve 1
315Y036O-RING 1
415Y035O-RING 2
8 15A143 COVER 1
9 117123 SCREW, fhms, M4x10 2
10 15A219 RING, for non-npt model 233812
only
11 117101 PLUG, threaded 2
12 117085 SEAL, ring 1
13 117099 PLUG, threaded 1
14 245373 PLUNGER, valve 1
Qty
2
2
3
4
1
10
5
4
8
1
Torque to 6 N•m (53 in-lb).
2
Torque to 2 N•m (18 in-lb).
3
Fill internal cavity with grease.
5
Used only on non-npt model 233812.
6
TI11248a
Torque to 5 N•m (44in-lb).
Ref.
No. Part No. Description
15 15A179 DIAPHRAGM 1
16 15A173 CAP, spring 1
17 117122 NUT, seal-lock 1
18 15A175 PLATE, spring, bottom 1
19 117096 SPRING, compression 1
20 117092 SPRING, compression 1
21 15A176 PLATE, spring, top 1
22 117108 BALL, 8 mm 1
23 15A186 PACKING, PTFE with carbon 1
24 245366 HOUSING, upper 1
25 117129 SCREW, shcs, M5x80 8
26 117017 WASHER 8
27 15A141 BONNET, cover 1
28 15A242 SCREW, custom 1
Qty
309474K 15
Parts
Mechanical Fluid Pressure Regulators
Part Nos. 233757, 233774, 234263, and 234273
28
25
1
24
10
5
22
21
1213
19
17
3
11
4
16
2
8
23
9
Ref.
No. Part No. Description
1 HOUSING, lower, for 233757 and
233774
HOUSING, lower, for 234263 and
234273
2 245368 SEAT, valve 1
3 15Y036 O-RING 1
4 15Y035 O-RING 2
5 117106 BALL, 6 mm, carbide 1
6 15A205 SUPPORT, ball 1
7 117090 SPRING, compression 1
8 15A144 COVER 1
9 117123 SCREW, fhms, M4x10 2
10 15A219 RING, for non-npt models 233757
and 233774 only
11 117101 PLUG, threaded 2
12 117085 SEAL, ring 1
Qty
15
14
2
3
4
1
10
5
TI1751A
5
6
7
4
1
Torque to 4-5 N•m (35-44 in-lb).
2
Torque to 2 N•m (18 in-lb).
3
Torque to 5 N•m (44 in-lb).
4
Grease OD.
5
Used only on non-npt models 233757 and 233774.
Ref.
No. Part No. Description
13 117099 PLUG, threaded 1
1
14 245372 PLUNGER, valve 1
15 15A179 DIAPHRAGM 1
1
16 15A172 CAP, spring 1
17 117122 NUT, seal-lock 1
19 117087 SPRING, compression, for 233774
and 234273
117095 SPRING, compression, for 233757
and 234263
21 15A177 PLATE, spring, top 1
22 117105 BALL, 6 mm 1
23 15A185 PACKING, PTFE with carbon 1
24 245365 HOUSING, upper 1
2
25 117126 SCREW, shcs, M5x16 8
28 15A241 SCREW, custom 1
Qty
1
1
16 309474K
Mechanical Back Pressure Regulators
Part Nos. 233758, 233811, 233950, 234255, 234261, and 234262
28
Parts
25
1
24
10
5
22
21
13
12
19
17
3
11
6
2
4
16
23
8
7
9
6
TI11249a
15
14
2
3
6
4
1
10
5
4
1
Torque to 4-5 N•m (35-44 in-lb).
2
Torque to 2 N•m (18 in-lb).
3
Torque to 5 N•m (44 in-lb).
4
Grease OD.
5
Used only on non-npt models
233758, 233950, and 233811.
6
Not used on models 233811 and
234255.
7
Models 233811 and 234255 use a
plug and retaining ring (not shown).
Ref.
No. Part No. Description
1 HOUSING, lower, for 233758 and
233950
HOUSING, lower for 234262 and
234261
15A198 HOUSING, lower, for 233811 1
15C303 HOUSING, lower, for 234255 1
2 245369 SEAT, valve, for 233758, 233950,
234261, and 234262
15A228 SEAT, valve, for 233811 and
234255
3 15Y036 O-RING, not used on models
233811 and 234255
4 15Y035 O-RING, for 233758, 233950,
234261, and 234262
15Y031 O-RING, for 233811 and 234255 2
8 15A143 COVER, for 233758, 233950,
234261, and 234262
15A222 PLUG, for 233811 and 234255 1
9 117123 SCREW, fhms, M4x10, not used on
models 233811 and 234255
10 15A219 RING, for non-npt models 233758,
and 233950
15A221 RING, for non-npt model 233811 2
Qty
Ref.
No. Part No. Description
11 117101 PLUG, threaded, not used on mod-
1
12 117085 SEAL, ring 1
1
13 117099 PLUG, threaded 1
14 245373 PLUNGER, valve, for 233758,
1
1
1
2
1
245378 PLUNGER, valve, for 233811 and
15 15A179 DIAPHRAGM 1
16 15A172 CAP, spring 1
17 117122 NUT, seal-lock 1
19 117087 SPRING, compression, for 233758
117095 SPRING, compression, for 233811,
21 15A177 PLATE, spring, top 1
22 117105 BALL, 6 mm 1
23 15A185 PACKING, PTFE with carbon 1
24 245365 HOUSING, upper 1
2
25 117126 SCREW, shcs, M5x16 8
28 15A241 SCREW, custom 1
2
29 117124 RING, retaining, 233811 and
els 233811 and 234255
233950, 234261, and 234262
234255
and 234262
233950, 234261, and 234255
234255 only
Qty
2
1
1
1
1
1
309474K 17
Parts
Pneumatic Fluid Pressure Regulators
Part Nos. 233773, 233809, 234272, and 234256
26
27
6
6
25
1
24
17
3
14
2
3
1
Torque to 4-5 N•m (35-44 in-lb).
2
Torque to 2 N•m (18 in-lb).
3
Torque to 5 N•m (44 in-lb).
4
Grease OD.
5
Used only on non-npt models
233773 and 233809.
6
Used only on npt models
234272 and 234256.
10
13
5
12
21
16
4
23
11
2
15
8
9
Ref.
No. Part No. Description Qty.
1 HOUSING, lower, for 233773 and
233809
HOUSING, lower, for 234272 and
234256
2 245368 SEAT, valve, for 233773 and
234272
245371 SEAT, valve, for 233809 and
234256
3 15Y036 O-RING 1
4 15Y035 O-RING 1
5 117106 BALL, 6 mm, carbide, for 233773
and 234272
117110 BALL, 6 mm, for 233809 and
234256
6 15A205 SUPPORT, ball 1
7 117090 SPRING, compression 1
8 15A144 COVER 1
4
1
10
5
5
6
7
4
TI1755A
Ref.
No. Part No. Description Qty.
9 117123 SCREW, fhms, M4x10 2
1
10 15A219 RING, for non-npt models 233773
1
11 117101 PLUG, threaded 2
12 117085 SEAL, ring 1
1
13 117099 PLUG, threaded 1
14 245372 PLUNGER, valve 1
1
15 15A179 DIAPHRAGM 1
16 15A204 PISTON 1
17 117122 NUT, seal-lock 1
21 117102 SEAL, flat 1
1
23 15A185 PACKING, PTFE with carbon 1
24 15A191 HOUSING, upper 1
1
25 117127 SCREW, shcs, M5x35 8
26 15C332 FITTING, for npt models 234272
27 15C333 WASHER, for npt models 234272
and 233809
and 234256 only
and 234256 only
2
1
1
18 309474K
Pneumatic Back Pressure Regulators
Part Nos. 233810 and 234257
26
27
6
6
25
1
Parts
24
14
2
17
3
10
13
5
12
21
16
4
3
4
1
10
5
23
1
Torque to 4-5 N•m (35-44 in-lb).
15
11
2
4
8
9
TI11250a
2
Torque to 2 N•m (18 in-lb).
3
Torque to 5 N•m (44 in-lb).
4
Grease OD.
5
Used only on non-npt model 233810.
6
Used only on npt model 234257.
Ref.
No. Part No. Description Qty.
1 HOUSING, lower, for 233810 1
HOUSING, lower, for 234257 1
2 245369 SEAT, valve 1
3 15Y036 O-RING 1
4 15Y035 O-RING 1
8 15A143 COVER 1
9 117123 SCREW, fhms, M4x10 2
10 15A219 RING, for non-npt model 233810 2
11 117101 PLUG, threaded 2
12 117085 SEAL, ring 1
13 117099 PLUG, threaded 1
Ref.
No. Part No. Description Qty.
15 15A179 DIAPHRAGM 1
16 15A204 PISTON 1
17 117122 NUT, seal-lock 1
21 117102 SEAL, flat 1
23 15A185 PACKING, PTFE with carbon 1
24 15A191 HOUSING, upper 1
25 117127 SCREW, shcs, M5x35 8
26 15C332 FITTING, for npt model 234257
only
27 15C333 WASHER, for npt model 234257
only
14 245373 PLUNGER, valve 1
309474K 19
1
1
Technical Data
Technical Data
Category Data
Maximum Fluid Inlet Pressure
(Fluid Pressure Regulators)
233757, 233773, 233774, 233809,
234256, 234263, 234272, 234273 :
580 psi (4000 kPa, 40 bar)
233759, 234267:
Maximum Permanent Supply Pressure (Back Pressure Regulators)
Pressure Range
Maximum Operating Air Pressure
(Pneumatic Regulators Only)
Maximum Flow Rate See chart on page 21.
Temperature Range
233758, 233810, 234257, 234262:
233811, 233950, 234255, 234261:
233812
233773, 233809, 234272, 234256:
233758, 233774, 233810,
234257,234262, 234273 :
233757, 234263:
233811, 233950, 234255, 234261:
233812, 234258:
233759, 234267:
145 psi (1 MPa, 10 bar)
233757, 233758, 233759, 233773, 233774, 233809, 233810, 233811, 233950,
234255, 234256, 234261, 234262, 234263, 234273:
, 234258: 725 psi (5000 kPa, 50 bar)
1015 psi (7000 kPa, 70 bar)
15-290 psi (100-2000 kPa, 1-20 bar)
73-725 psi (500-5000 kPa, 5-50 bar)
145-725 psi (1000-5000 kPa, 10-50 bar)
145 psi (1000 kPa, 10 bar)
290 psi (2000 kPa, 20 bar)
6-145 psi (40-1000 kPa, 0.4-10 bar)
15-145 psi (100-1000 kPa, 1-10 bar)
29-290 psi (200-2000 kPa, 2-20 bar)
32-194°F (0-90°C)
233812, 234258:
Fluid inlet and outlet
Air inlet
*Gauge port 1/8 in. BSPP(F)
Wetted Parts Stainless steel, tungsten carbide, PTFE, chemically resistant fluoroelastomer,
* Accessory gauges available.
233757, 233758, 233759, 233773, 233774,
233809, 233810, 233812, 233950:
234256, 234257, 234258, 234261,
234262, 234263, 234267, 234272, 234273: 3/8 in. npt(f)
233811:
234255: 1 in. npt(f)
233773, 233809, 233810:
234256, 234257, 234272: 1/4 in. npt(m)
PEEK
1 in. BSPP(F)
(233809 and 234256 only)
50-176°F (10-80°C)
3/8 in. BSPP(F)
1/4 in. BSPP(F)
20 309474K
Accessory Gauges
Accessory Gauges
Part No. Gauge
233774 118338
243273 118338
233757 118338
234262 118338
233759 118339
234267 118339
234773 118338
234272 118338
233809 118338
234273 118338
Part No. Gauge
233758 118338
234262 118338
233950 118338
234261 118338
233811 118338
234255 118338
233812 118339
234258 118339
233810 118338
234257 118338
Flow Rate Data
Maximum fluid flow with 10 weight oil, regulator wide open and no downstream restrictions.
Part No. Inlet Fluid Test Pressure Inlet/Outlet Size Seat Size Fluid Flow
233757
234263
233758
234262
233759
234267
233773
234272
233774
234273
233809
234256
233810
234257
233811
234255
233812
234258
233950
234261
580 psi (4000 kPa, 40 bar) 3/8 BSPP(F)
3/8 npt(f)
145 psi (1000 kPa, 10 bar) 3/8 BSPP(F)
3/8 npt(f)
1015 psi (7000 kPa, 70 bar) 3/8 BSPP(F)
3/8 npt(f)
580 psi (4000 kPa, 40 bar) 3/8 BSPP(F)
3/8 npt(f)
580 psi (4000 kPa, 40 bar) 3/8 BSPP(F)
3/8 npt(f)
580 psi (4000 kPa, 40 bar) 3/8 BSPP(F)
3/8 npt(f)
145 psi (1000 kPa, 10 bar) 3/8 BSPP(F)
3/8 npt(f)
290 psi (2000 kPa, 20 bar) 1 in. BSPP(F)
1 in. npt(f)
725 psi (5000 kPa, 50 bar) 3/8 BSPP(F)
1 in. npt(f)
290 psi (2000 kPa, 20 bar) 3/8 BSPP(F)
1 in. npt(f)
5 mm 7.0 gpm (26.6 lpm)
6.5 mm 4.6 gpm (17.5 lpm)
5 mm 9.8 gpm (37.2 lpm)
5 mm 7.0 gpm (26.6 lpm)
5 mm 7.0 gpm (26.6 lpm)
5 mm 7.0 gpm (26.6 lpm)
6.5 mm 4.6 gpm (17.5 lpm)
13 mm 7.8 gpm (29.6 lpm)
6.5 mm 11.5 gpm (43.7 lpm)
6.5 mm 5.7 gpm (21.7 lpm)
309474K 21
Mounting Dimensions
Mounting Dimensions
A
Part No. Thread Dimension A
233757
234263
233758
234262
233759
234267
233773
234272
233774
234273
233809
234256
233810
234257
233811
234255
233812
234258
233950
234261
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
M5 36 mm (1.42 in.)
M5 24 mm (0.95 in.)
M5 24 mm (0.95 in.)
22 309474K
Mounting Dimensions
309474K 23
Graco 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
For the latest information about Graco products, visit www.graco.com.
For patent information, see www.graco.com/patents.
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 INC. AND SUBSIDIARIES • P.O. BOX 1441 • MINNEAPOLIS MN 55440-1441 • USA
Graco reserves the right to make changes at any time without notice.
This manual contains English. MM 309474
Graco Headquarters: Minneapolis
International Offices: Belgium, China, Japan, Korea
Copyright 2002, Graco Inc. is registered to ISO 9001
www.graco.com
Revision K, September 2014
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