Graco H Series Operation manual

Instructions–Parts List
306563K
ENG
Important Safety Instructions
Read all warnings and instructions in this manual.
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LOW PRESSURE
Fluid Regulator
For accurate, positive control of fluid pressure to one spray gun,
dispensing valve, or atomizing head. For professional use only.
250 psi (18 bar, 1.8 MPa) Maximum Inbound Pressure
Model 203831 Series H
0–60 psi (0–4 bar, 0–0.4 MPa) Regulated Pressure
Gives positive control of fluid pressures in most normal
direct supply and circulating spray systems.
Model 204500 Series H
0–15 psi (0–1 bar, 0–0.1 MPa) Regulated Pressure
Has a counterbalance spring for positive closure at
extremely low pressures.
Model 204501 Series H
20–160 psi (1.5–11 bar, 0.15–1.1 MPa) Regulated
Pressure
Has a heavier spring for precise control of fluid in the
regulated range.
Model 205425 Series H
0–60 psi (0–4 bar, 0–0.4 MPa) Regulated Pressure
has a large valve for more viscous fluids. Not intended
for use with standard paints and lighter viscosity fluids,
as these fluids lower the sensitivity of this regulator.
03367
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2 306563
Table of Contents
Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Number 12. . . . . . . . . . . . . . . . . . . . . . . . . .
Symbols
Warning Symbol
WARNING
This symbol alerts you to the possibility of serious
injury or death if you do not follow the instructions.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
WARNING
EQUIPMENT MISUSE HAZARD
Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury.
DThis equipment is for professional use only.
DRead all instruction manuals, tags, and labels before operating the equipment.
DUse the equipment only for its intended purpose. If you are not sure, call your Graco distributor.
DDo not alter or modify this equipment.
DCheck equipment daily. Repair or replace worn or damaged parts immediately.
DDo not exceed the maximum working pressure stated on the equipment or in the Technical Data
for your equipment. Do not exceed the maximum working pressure of the lowest rated component
in your system.
DUse fluids and solvents which are compatible with the equipment wetted parts. Refer to the Tech-
nical Data section of all equipment manuals. Read the fluid and solvent manufacturer’s warnings.
DHandle hoses carefully. Do not pull on hoses to move equipment.
DRoute hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 66_C (150_F) or below –40_C (–40_F).
DWear hearing protection when operating this equipment.
DDo not move or lift pressurized equipment.
DComply with all applicable local, state, and national fire, electrical, and safety regulations.
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3306563
WARNING
SKIN INJECTION HAZARD
Spray from the gun, leaks or ruptured components can inject fluid into your body and cause extremely
serious injury, including the need for amputation. Fluid splashed in the eyes or on the skin can also
cause serious injury.
DFluid injected into the skin is a serious injury. The injury may look like just a cut, but it is a serious
injury. Get immediate surgical attention.
DDo not stop or deflect leaks with your hand, body, glove or rag.
DAlways have the tip guard and the trigger guard on the gun when spraying.
DCheck the gun diffuser operation weekly. Refer to the gun manual.
DBe sure the gun trigger safety operates before spraying.
DLock the gun trigger safety when you stop spraying.
DFollow the Pressure Relief Procedure for your equipment if the spray tip clogs and before clean-
ing, checking or servicing the equipment.
DTighten all fluid connections before operating the equipment.
DCheck the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately. Do not
repair high pressure couplings; you must replace the entire hose.
DFluid hoses must have spring guards on both ends, to help protect them from rupture caused by
kinks or bends near the couplings.
MOVING PARTS HAZARD
Moving parts can pinch or amputate your fingers.
DKeep clear of all moving parts when starting or operating the pump.
DBefore checking or servicing the equipment, follow the Pressure Relief Procedure for your sys-
tem to prevent the equipment from starting unexpectedly.
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4 306563
WARNING
FIRE AND EXPLOSION HAZARD
Improper grounding, poor ventilation, open flames or sparks can cause a hazardous condition and re-
sult in a fire or explosion and serious injury.
DIf there is any static sparking or you feel an electric shock while using this equipment, stop spray-
ing immediately. Do not use the equipment until you identify and correct the problem.
DProvide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid
being sprayed.
DKeep the spray area free of debris, including solvent, rags, and gasoline.
DBefore operating this equipment, electrically disconnect all equipment in the spray area.
DBefore operating this equipment, extinguish all open flames or pilot lights in the spray area.
DDo not smoke in the spray area.
DDo not turn on or off any light switch in the spray area while spraying or while operating if fumes
are present.
DDo not operate a gasoline engine in the spray area.
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.
DKnow the specific hazards of the fluid you are using.
DStore hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
DAlways wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer.
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5306563
Installation
F
E
A
C
G
D
H
B
A
B
C
D
E
F
G
H
Regulator
Dispensing Unit
Gauge
Regulator Inlet
Regulator Outlet
Air Regulator
Supply Line
Accessory Outlet
KEY
Fig. 1
03363
TYPICAL INSTALLATION
CAUTION
Before installing the regulator, check the tightness of
the screws (1). Refer to Fig. 3 for the tightening
sequence and the torque value. If the regulator leaks
during operation, check and torque the screws again.
In order to prevent damaging the regulator, blow out
and flush the supply line to remove any particles.
DInstall regulator (A) in fluid supply line as close as
possible to spray gun or dispensing valve (B) for
easy operator control.
DMount the regulator in an upright position so that
the gauge (C) can be easily read.
DIf turning the gauge, reapply sealer to the threads,
and use a wrench on the inlet stud to turn gauge.
Regulator inlet (D) is 3/8 npsm (f) swivel and outlet
(E) is 3/8 npsm (m) rigid.
DConnect a fluid hose to regulator outlet (E) and
spray gun. Connect an air atomizing hose to the
spray gun and air regulator (F) See Fig. 1.
DTo mount the regulator in a circulating system
supply line (G), install an accessory outlet (H). One
outlet (H) and air regulator (F) are required for each
spray gun. The accessory outlet (Part No. 204819)
may be ordered separately.
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6 306563
Operation
WARNING
To reduce the risk of component rupture, which
can cause a fire or explosion and result in
serious bodily injury, including splashing in the
eyes, never exceed 250 psi (18 bar, 1.8 MPa)
Maximum Inbound Fluid Pressure to this regula-
tor.
CAUTION
Do not pressure test the regulator with air; use
solvent. Air may cause leaks between the fluid seals
and result in fluid leaks during normal operation.
If the rest of the system must be pressure tested
with air, loop past the regulator during the test.
1. Insert hex end of key (25) in adjusting screw (20)
and turn counterclockwise until spring tension is
relieved. See Figs 2 and 3.
2. Start pump and open shutoff valve of outlet (H) to
admit fluid to regulator. Turn key (25) clockwise
until desired fluid pressure shows on gauge.
CAUTION
Do not exceed the Regulated Pressure specification
of your regulator. Pressures higher than specified
can damage the gauge.
Note: When reducing pressure, relieve pressure in gun
and supply line to ensure a correct gauge reading.
CLEANING THE REGULATOR
Note: Flush the regulator every four weeks, or as
necessary for the amount and type of use.
1. Clear regulator of paint or other fluid by blowing
back fluid through the gun and hose.
2. Shut off supply pump and relieve line pressure by
opening back pressure regulator or other by-pass
valve.
3. Open regulator valve by screwing the threaded
portion of key (25) as far as possible into the cap.
See Fig. 2.
4. Loosen air cap ring of spray gun three turns, hold
a rag firmly over the end of the cap and trigger the
gun. Air will force fluid back through the gun, hose
and regulator.
5. After blow-back, remove the adjusting key (25)
Note: Do not use the threaded end of key (25) to
adjust pressure.
6. Flush regulator until clean.
25
Fig. 2
Blow Back Position Regulating Position
03369
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7306563
Troubleshooting
Problem Cause Solution
No pressure regulation Damaged diaphragm Replace diaphragm (31).
Fluid leaks under cap Loose cap, worn gasket Tighten screws (1), replace gasket
(32).
Damaged diaphragm Replace diaphragm (31).
Pressure creeps above setting Loose cap Tighten screws (1).
Worn gasket Replace gasket (32).
Damaged diaphragm Replace diaphragm (31).
Worn or held open fluid valve Flush regulator, replace fluid
valves (26 & 27) if worn excessively.
Pressure drops below setting Loose cap Tighten screws (1).
Worn gasket Replace gasket (32).
Blocked fluid supply line or valve Flush supply line and valve,
service if necessary.
Using regulator beyond capacity Do not use regulator beyond its rated
capacity.
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8 306563
Service
Regulator Disassembly
Shut off pump, close shutoff valve and relieve pressure
in regulator by triggering the spray gun. Remove the
regulator from the system.
1. Using the hex end of key (25), adjust screw (20) all
the way counterclockwise to relieve regulator
spring tension.
2. Remove outlet bushing (15) and counter-balance
spring (29) (Model 204500 only) from the body.
3. Unscrew valve stem (27) from diaphragm hanger
(28) with adjusting key. See Fig. 3.
4. Remove screws (1), regulator cap (17), spring
adjusting screw (20), spring (13), and spring
cap (30) (Model 204500 only).
5. Lift diaphragm (31) and hanger from body. Disas-
semble the hanger and diaphragm only if dam-
aged.
6. Unscrew valve seat (26) from body with a 9/16”
socket wrench. See Fig. 3.
7. Thoroughly inspect all parts and inspect for wear
or damage, replacing as necessary.
CAUTION
Use special care in handling the valve stem and seat
to avoid damaging the hard carbide parts.
Regulator Reassembly
Reassemble regulator in reverse order of Disassem-
bly. When inserting the diaphragm and hanger, be
sure that all surfaces are clean and smooth. Any dirt or
roughness could damage the diaphragm.
Note: Hold hanger (28) and valve stem (27) in place
with a finger so that the valve stem is correctly lined up
with the valve seat (26).
The hanger should be in line with one set of holes and
the nut should be torqued to 20 ft-lb (27 NSm). Turn the
valve stem snugly against the seat and then back off
1/2 turn on model 204500 and 3/4 turn on other mod-
els to set valve clearance. When installing the
cap (17), line up finger of spring adjusting nut (12) with
the groove in the cap (17) . Torque the six screws (1)
evenly to 120–130 in-lb (13.6–14.7 NSm) three times
consecutively, in the order shown in the TOP VIEW, to
compensate for diaphragm relaxation. See Fig. 3.
Note: If further service is needed, see notes on lu-
brication, thread sealant, and torque values in Fig. 4.
03372
03370
03371
Fig. 3
1
3
4
2
1
23
4
5
6
Gauge
25
17
1
1
27
29
15
28
26
31 2
30
13 3
32
12
20
3
28
10
5
5
See TOP VIEW for tightening sequence.
Lubricate with oil.
Lubricate with grease.
4
Torque to 20 ft-lb (27 NSm).
Hanger must be parallel
to diaphragm holes.
TOP VIEW
6
6
Torque to 120–130 in-lb
(13.6–14.7 NSm).
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9306563
Notes
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10 306563
Parts
03374
Fig. 4
1
3
4
2
25
11
17
34
4
3
20
2
2
12
13
30
10
21
9
31 3
32*
33*
28*
27*
16
14
2
*7
4
5
5
26
29
22*
15
19
See torque sequence in Fig. 3.
Lubricate with grease.
side down.
Lubricate with oil.
Apply sealant to threads.
*54
11
Torque to 70–80 in-lb (8–9 NSm).
4
6
6
7
7
4
Torque to 30–35 ft-lb (41–47 NSm)
PTFE
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