Graco 233757 User Manual
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.
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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
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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.
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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.
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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)
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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
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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
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