Graco 307107N User Manual
Instructions-Parts List
STAINLESS STEEL, WATERBASE COMPATIBLE
307107N
Back Pressure Valve
Used in circulating systems to provide regulated back pressure to the spray gun(s) and to
maintain proper circulating pressure throughout the system. For professional use only.
Model 208997, Series E
Stainless Steel Back Pressure Valve
300 psi (2.1 MPa, 21 bar) Maximum Inlet Pressure
200 psi (1.4 MPa, 14 bar) Maximum Regulated Pressure
Important Safety Instructions
Read all warnings and instructions in this
manual. Save these instructions.
EN
Contents
Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Graco Standard Warranty . . . . . . . . . . . . . . . . . . . . 9
Graco Information . . . . . . . . . . . . . . . . . . . . . . . . . . 10
WARNING
WARNINGWARNINGWARNING
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.
• Check equipment daily. Repair or replace worn or damaged parts immediately.
• Do not exceed the maximum inlet pressure of the lowest rated system component. The maximum
inlet pressure of this equipment is 300 psi (2.1 MPa, 21 bar).
• Follow the Pressure Relief Procedure on page 4 if the spray tip clogs and before cleaning, checking
or servicing the equipment.
• Do not stop or deflect leaks with your hand, body, glove or rag.
• Be sure all equipment safety devices are operating properly before each use.
• Use fluids and solvents which are compatible with the equipment wetted parts. Refer to the
Technical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s
warnings.
• Always wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer.
• Wear hearing protection when operating this equipment.
• Comply with all applicable local, state, and national fire, electrical, and safety regulations.
2 307107N
Installation
KEY
A Fluid supply line E Adjusting screw
B Air spray gun F Back pressure valve
C Fluid pressure regulator G Fluid return line
D Air supply line
A
Operation
B
C
FIG. 1
CAUTION
Handle the back pressure valve with care to avoid damaging the diaphragm.
Installing the Back Pressure Valve
Install the back pressure valve in the spray gun return
line. See Fig. 1.
D
E
G
F
8719A
Connect the line to the 1-1/4 in. npt(f) inlet and outlet.
Make sure the flow direction agrees with the IN and
OUT markings on the valve body.
The back pressure valve is adjustable to control the fluid
pressures in a circulating system from 5 to 200 psi
(0.035 to 1.4 MPa, 0.35 to 14 bar).
If more than one spray station is used, install the back
pressure valve in the fluid supply line after the last station. This will help maintain proper circulating pressures
in the system.
Operation
NOTE: The back pressure valve controls pressure
ahead of its intake.
Turn the adjusting screw
and
counterclockwise
307107N 3
clockwise
to decrease pressure.
to increase pressure
Adjust the pump pressure and back pressure valve for
the best spraying combination and for proper circulation
of fluid.
Flush the back pressure valve with a compatible solvent
whenever the rest of the system or unit is being flushed.
Open the back pressure valve before flushing by turning
the screw
counterclockwise
.
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