Graco H Series Operation manual

Instructions–Parts List

306563K

ENG

Important Safety Instructions

Read all warnings and instructions in this manual.

Save these instructions.

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

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.

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

Gauge

31 2

13 3

See TOP VIEW for tightening sequence.

Lubricate with oil.

Lubricate with grease.

Torque to 20 ft-lb (27 NSm).

Hanger must be parallel

to diaphragm holes.

TOP VIEW

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

31 3

32*

33*

28*

27*

22*

See torque sequence in Fig. 3.

Lubricate with grease.

side down.

Lubricate with oil.

Apply sealant to threads.

*54

Torque to 70–80 in-lb (8–9 NSm).

Torque to 30–35 ft-lb (41–47 NSm)

PTFE

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