Graco 205612 Manuale utente

306715

Rev. G

Supersedes Rev. F

First choice when

quality counts.t

06479

06480

INSTRUCTIONS-PARTS LIST

INSTRUCTIONS

This manual contains important

warnings and information.

READ AND KEEP FOR REFERENCE.

Stainless Steel, Air-Operated

Dispensing Valve

3000 psi (21.0 MPa, 210 bar) Maximum Working Pressure

Model 205612, Series B

Without seat or fluid needle

Model 205435

Includes Dispensing Valve 205612, chrome-plated

tapered fluid needle, and seat.

Model 207440, Series D

Includes chrome-plated fluid needle with tungsten

carbide ball, and seat.

GRACO INC. P.O. BOX 1441 MINNEAPOLIS, MN 55440–1441

Graco Inc. is registered to I.S. EN ISO 9001

Parts

Contents

2 306715

Table of Contents

Warnings 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Grounding 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Installation 6. . . . . . . . . . . . . . . . . . . . . . . . . .

General Information 6. . . . . . . . . . . . . . . . . . . . . . . . .

Ventilate the Dispense Booth 6. . . . . . . . . . . . . . . . .

Mount Valve 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connect the Air Lines 6. . . . . . . . . . . . . . . . . . . . . . .

Connect the Fluid Lines 7. . . . . . . . . . . . . . . . . . . . . .

System Accessories 7. . . . . . . . . . . . . . . . . . . . . . . .

Operation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Settings and Adjustments 8. . . . . . . . . . . . . . . . . . . .

Pressure Relief Procedure 8. . . . . . . . . . . . . . . . . . .

Maintenance 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clean the Dispensing Valve Daily 9. . . . . . . . . . . . .

Flushing 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Needle, Seat and Packings 11. . . . . . . . . . . . . . . . .

Air Piston, Spring and Seals 11. . . . . . . . . . . . . . . . .

Packing Configurations 11. . . . . . . . . . . . . . . . . . . . .

Parts 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 205435 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Model 205612, Series B 12. . . . . . . . . . . . . . . . . . . .

Model 207440, Series D 13. . . . . . . . . . . . . . . . . . . .

Manual Change Summary 13. . . . . . . . . . . . . . . . . . . . .

Dimensions 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Data 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco Standard Warranty 16. . . . . . . . . . . . . . . . . . . . .

Graco Phone Number 16. . . . . . . . . . . . . . . . . . . . . . . .

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

corresponding instructions.

3306715

WARNING

INJECTION HAZARD

Spray from the valve, hose leaks, or ruptured components can inject fluid into your body and cause an

extremely serious injury, including the need for amputation. Splashing fluid in the eyes or on the skin

can also cause a serious injury.

DFluid injected into the skin might look like just a cut, but it is a serious injury. Get immediate medi-

cal attention.

DDo not point the dispensing valve at anyone or at any part of the body.

DDo not put hand or fingers over the nozzle.

DDo not stop or deflect fluid leaks with your hand, body, glove, or rag.

DDo not “blow back” fluid; this is not an air spray system.

DFollow the Pressure Relief Procedure on page 8 whenever you: are instructed to relieve pres-

sure; stop dispensing; clean, check, or service the equipment; and install or clean the nozzle.

DTighten all the fluid connections before operating the equipment.

DCheck 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 fluids or toxic fumes can cause a serious injury or death if splashed in the eyes or on the

skin, swallowed, or inhaled.

DKnow the specific hazards of the fluid you are using. Read the fluid manufacturer’s warnings.

DStore hazardous fluid in an approved container. Dispose of the hazardous fluid according to all

local, state, and national guidelines.

DWear appropriate protective clothing, gloves, eyewear, and respirator.

4 306715

WARNING

FIRE AND EXPLOSION HAZARD

Improper grounding, poor air ventilation, open flames, or sparks can cause a hazardous condition and

result in fire or explosion and serious injury.

DGround the equipment and the object being sprayed. See Grounding on page 5.

DProvide fresh air ventilation to avoid the buildup of flammable fumes from solvent or the fluid being

dispensed.

DExtinguish all the open flames or pilot lights in the dispensing area.

DElectrically disconnect all the equipment in the dispensing area.

DKeep the dispensing area free of debris, including solvent, rags, and gasoline.

DDo not turn on or off any light switch in the dispensing area while operating or if fumes are present.

DDo not smoke in the dispensing area.

DDo not operate a gasoline engine in the dispensing area.

DIf there is any static sparking while using the equipment, stop dispensing immediately. Identify

and correct the problem.

INSTRUCTIONS

EQUIPMENT MISUSE HAZARD

Equipment misuse can cause the equipment to rupture, malfunction, or start unexpectedly and result

in a serious injury.

DThis equipment is for professional use only.

DRead all the instruction manuals, tags, and labels before operating the equipment.

DUse the equipment only for its intended purpose. If you are uncertain about usage, call your Graco

distributor.

DDo not alter or modify this equipment. Use only genuine Graco parts and accessories.

DCheck the equipment daily. Repair or replace worn or damaged parts immediately.

DDo not exceed the maximum working pressure of the lowest rated system component. These

dispensing valves have a 3000 psi (21.0 MPa, 210 bar) Maximum Working Pressure.

DUse fluids that are compatible with the equipment wetted parts. See the Technical Data section of

all the equipment manuals. Read the fluid manufacturer’s warnings.

DRoute the 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).

DWear hearing protection when operating this equipment.

DComply with all applicable local, state, and national fire, electrical, and other safety regulations.

MOVING PARTS HAZARD

Moving parts, such as the air motor piston, can pinch or amputate fingers.

DKeep clear of all moving parts when starting or operating the pump.

DBefore servicing the equipment, follow the Pressure Relief Procedure on page 8 to prevent the

equipment.

5306715

Installation

Grounding

WARNING

FIRE AND EXPLOSION HAZARD

Before operating, ground the system as

explained below. Also read the section

FIRE AND EXPLOSION HAZARD on

page 4.

To reduce the risk of static sparking, ground the pump

and all other components used or located in the dis-

pensing area. Check your local electrical code for

detailed instructions for your area and type of equip-

ment and be sure to ground all of these components.

DPump: use a ground wire and clamp as instructed

in your separate pump instruction manual.

DAir compressors and hydraulic power supplies:

ground according to the manufacturer’s recommen-

dations.

DAir and fluid hoses: use only electrically conductive

hoses with a maximum of 500 feet (150 m) com-

bined hose length to ensure grounding continuity.

DDispensing valve: obtain grounding through con-

nection to a properly grounded fluid hose and

pump.

DFluid supply container: according to local code.

DAll solvent pails used when flushing, according to

local code. Use only metal pails, which are conduc-

tive. Do not place the pail on a non-conductive

surface, such as paper or cardboard, which inter-

rupts grounding continuity.

6 306715

Installation

Key

Bleed-type Master Air Valve

Air Regulator

Supply Pump

Fluid Drain Valve

Air Line

Fluid Line

Solenoid Valve

Control Box

Dispensing Valve

Sensing Device

Back Pressure Valve

Circulation Return Line (optional)

Air Line Filter

Fluid Pressure Regulator

Fluid Filter

Pump Runaway Valve

Air Line Lubricator

Typical Installation

06481

General Information

NOTE: Reference numbers and letters in parentheses

in the text refer to the callouts in the figures and the

parts drawing.

NOTE: Always use Genuine Graco Parts and Acces-

sories, available from your Graco distributor.

The Typical Installation drawing above is only a

guide for selecting required and optional accessories

for an automatic dispensing system. Contact your

Graco distributor for assistance in designing a system

to meet your particular needs.

Ventilate the Dispense Booth

WARNING

To prevent hazardous concentrations of toxic

and/or flammable vapors, use this valve only in a

properly ventilated dispense booth. Never operate

the dispensing valve unless ventilation fans are

operating.

Mount Valve

Mount the valve on a 0.50 in. (12.7 mm) diameter rod

(Y) on a mounting fixture or a dispensing machine.

See Fig. 1 and the Typical Installation. Models

205435 and 205612 are supplied with a clamping

screw for mounting. For Model 207440, order the

clamping screw separately (Part No. 205355).

Connect the Air Lines

Clean all lines and connections of dirt, burrs, etc. and

blow them out with clean air before connecting them to

the system. The air supply line (E) should contain an

air filter (N) to remove harmful dirt and moisture from

the compressed air.

Use a normally closed 3-way air solenoid valve (G) to

control the dispensing valve (J). Attach a grounded air

supply line (E) from the 3-way valve to the 1/4

npsm(m) air inlet adapter (7) of the dispensing valve.

See Fig. 1.

Fig. 1

06482

Model 207440 Shown

7306715

Installation

Connect the Fluid Lines

Connect a grounded fluid line (F) from the pump to the

fluid inlet adapter (19) of the dispensing valve. You

should install a fluid pressure regulator (P) to control

fluid pressure to the dispensing valve. A regulator

enables you to control fluid pressure more accurately

than by regulating air pressure to the pump.

Install a fluid filter (R) to remove particles and sedi-

ment which may clog the nozzle.

In a circulating system, remove the plug (4) from the

circulation port (X). Connect a return line (M) from the

circulating port to the back pressure valve. The back

pressure valve ensures regulated pressure to all

dispensing valves in the system.

System Accessories

WARNING

Two accessories are required in your system: a

bleed-type master air valve (A) and a fluid drain

valve (D). These accessories help reduce the risk

of serious injury including fluid injection, splashing

in the eyes or on the skin, and injury from moving

parts if you are adjusting or repairing the pump.

The bleed-type master air valve is required only

with air-powered pumps. It relieves air trapped

between this valve and the pump after the air

regulator is shut off. Trapped air can cause the

pump to cycle unexpectedly. Locate the valve close

to the pump.

The fluid drain valve assists in relieving fluid pres-

sure in the displacement pump, hose, and dispens-

ing valve; triggering the valve to relieve pressure

may not be sufficient.

8 306715

Operation

Settings and Adjustments

Before each day’s operation, lubricate the exposed

portion of the needle (22) and the piston (16) with a

lubricant compatible with the fluid being dispensed.

After lubrication, cover the exposed portions of the

needle and piston with a piece of plastic to prevent

fluid buildup on these parts. Any buildup could damage

the valve packing (9 or 20). See Fig. 3.

Set the actuating air to at least 50 psi (345 kPa, 3.4

bar) and start the pump. Adjust the pump speed and

pressure to obtain the desired flow rate. Always use

the lowest pump speed necessary to get the results

you want.

To decrease needle travel, turn the adjusting screw

(12) clockwise; to increase, turn counterclockwise. If

the valve leaks from the outlet after it is closed, turn

the adjusting screw clockwise until the valve stops

leaking.

In a circulating system, adjust the back pressure valve

to provide constant system back pressure for all dis-

pensing valves while maintaining the proper pressure

for fluid circulation. See the Typical Installation on

page 6.

Fig. 2

06482

Model 207440 Shown

Oil Daily

Pressure Relief Procedure

WARNING

INJECTION HAZARD

Fluid under high pressure can be in-

jected through the skin and cause

serious injury. To reduce the risk of an

injury from injection, splashing fluid, or moving

parts, follow the Pressure Relief Procedure

whenever you:

Dare instructed to relieve the pressure,

Dstop dispensing,

Dcheck or service any of the system equipment,

Dor install or clean the nozzle.

1. Shut off the power to the pump.

2. Close the bleed-type master air valve (required

with air powered pumps).

3. Actuate the dispensing valve to relieve pressure.

4. Open the pump drain valve (required in your

system) to help relieve fluid pressure in the dis-

placement pump. Actuating the dispensing valve to

relieve pressure may not be sufficient. Have a

container ready to catch the drainage.

5. Leave the drain valve(s) open until you are ready

to dispense again.

If you suspect that the dispensing valve or hose is

completely clogged, or that pressure has not been fully

relieved after following the steps above, very slowly

loosen the hose end coupling and relieve pressure

gradually, then loosen completely. Now clear the valve

or hose.

9306715

Maintenance

Clean the Dispensing Valve Daily

CAUTION

Be sure the solvent you use is compatible with the

fluid being dispensed, to avoid clogging the valve’s

fluid passages.

WARNING

To reduce the risk of serious injury whenever you

are instructed to relieve pressure, always follow the

Pressure Relief Procedure on page 8.

An important part of the care and maintenance of your

automatic dispensing valve is proper flushing. Flush

the valve daily with a compatible solvent until all traces

of fluid are removed from the valve passages. Relieve

the pressure before flushing.

Clean the outside surfaces of the valve by wiping with

a soft cloth dampened with a compatible solvent.

CAUTION

Never immerse the entire dispensing valve in sol-

vent. Immersing in solvent removes lubricants and

tends to damage packings.

To remove a hardened particle from the orifice, blow

air through the orifice from the front.

Flushing

WARNING

To reduce the risk of serious injury whenever you

are instructed to relieve pressure, always follow the

Pressure Relief Procedure on page 8.

Before flushing, be sure the entire system and flushing

pails are properly grounded. Refer to Grounding on

page 5. Relieve the pressure and remove the nozzle

from the dispensing valve. Always use the lowest

possible fluid pressure, and maintain firm metal-to-

metal contact between the dispensing valve and the

pail during flushing to reduce the risk of fluid injection

injury, static sparking, and splashing.

Start the pump and flush the system with a compatible

solvent as explained in the instructions for your pump.

Check the system under pressure for leaks; if any are

found, relieve the pressure and repair the leaks.

Pressurize the system again and make sure the leak-

ing has stopped.

10 306715

Troubleshooting

WARNING

To reduce the risk of serious injury whenever you

are instructed to relieve pressure, always follow the

Pressure Relief Procedure on page 8.

Before servicing this equipment always make sure to

relieve the pressure.

NOTE: Check all possible causes and solutions

before disassembling.

Problem Cause Solution

Uneven dispensing pattern. Fluid pressure too low. Increase air pressure to pump, or adjust

fluid pressure regulator.

Valve will not stop dispensing. Fluid pressure too high. Reduce air pressure to pump, or adjust

fluid pressure regulator.

Fluid needle binding. Clean, repair.

Piston packing binding. Repair.

Obstructed or worn needle or seat. Clean or replace.

Valve will not dispense. Pump not operating. Refer to separate pump manual.

Fluid line clogged. Clear.

Fluid valve closed. Open.

Clogged orifice or needle seat. Clean.

No trigger or actuator pressure. Check, clean all lines.

Worn or dry piston packings. Replace.

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