Graco 244920 Manuale operativo

Instructions – Parts List

GRACO INC.ąP.O. BOX 1441ąMINNEAPOLIS, MNą55440-1441

PrecisionFloXL Metering

Valve

3500 psi (24 MPa, 240 bar) Maximum Working Pressure

5000 psi (34 MPa, 345 bar) Maximum Fluid Pressure

For use when dispensing fluids that meet at least one

of the following conditions for non-flammability:

The fluid has a flash point above 140F (60C) and

a maximum organic solvent concentration of 20%,

by weight, per ASTM Standard D93.

The fluid does not sustain burning when tested per

ASTM Standard D4206 Sustained Burn Test.

Part No. 244920

PrecisionFlo Metering Valve for PVC application

Part No. 244921

PrecisionFlo Metering Valve for HemFlange application

Table of Contents

Symbols 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Warning 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installation 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operation and Maintenance 5. . . . . . . . . . . . . . . . . . . . . .

Service 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Wiring Diagram 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Data 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Related Publications 19. . . . . . . . . . . . . . . . . . . . . . . . . . .

Graco Standard Warranty 20. . . . . . . . . . . . . . . . . . . . . .

Graco Information 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

309382 Rev.C

Read warnings and instructions.

TI1394A

Parts

2 309382

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

INJECTION HAZARD

Spray from the dispensing device, hose leaks, or ruptured components can inject fluid into your body

and cause extremely serious injury, including the need for amputation. Splashing fluid in the eyes or

on the skin can also cause serious injury.

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

cal attention.

Do not point the dispensing device at anyone or at any part of the body.

Do not put hand or fingers over the front of the dispensing device.

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

Follow the Pressure Relief Procedure on page 5 whenever you: are instructed to relieve pres-

sure; stop dispensing; clean, check, or service the equipment; or install or clean a spray tip or

nozzle.

Tighten all the 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.

FIRE, EXPLOSION, AND ELECTRIC SHOCK HAZARD

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

result in fire or explosion and serious injury.

The system must only be installed and serviced by a qualified electrician.

Ground the equipment and the object being sprayed. The Metering Valve is grounded through

proper connection of the two electrical cables.

Do not install the Metering Valve in a hazardous area, as defined in Article 500 of the National

Electrical Code (USA).

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

Do not smoke in the dispensing area.

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

and correct the problem.

Disconnect the two electrical cables from the Metering Valve before servicing the valve.

309382 3

WARNING

INSTRUCTIONS

EQUIPMENT MISUSE HAZARD

Equipment misuse can cause the equipment to rupture, malfunction, or start unexpectedly 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 uncertain about usage, call your Graco

distributor.

Only use the PrecisionFlo Metering Valve with the PrecisionFlo Control.

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

Check the equipment daily. Repair or replace worn or damaged parts immediately.

Do not disassemble the Metering Valve motor. The motor contains powerful magnets, which could

attract metal objects and create a hazardous condition if the motor end plates are removed. Con-

tact your Graco distributor for motor service.

Do not exceed the maximum working pressure of the lowest rated system component. This equip-

ment has a 3500 psi (24 MPa, 240 bar) maximum working pressure.

Route the hoses away from the 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).

Do not use the hoses to pull the equipment.

Use 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.

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

Do not touch the metal heat sink when the surface is hot.

Do not cover the Metering Valve; the motor needs air ventilation.

TOXIC FLUID HAZARD

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

skin, swallowed, or inhaled.

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

Provide fresh air ventilation to avoid the buildup of vapors from the fluid being dispensed.

Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,

state and national guidelines.

Wear the appropriate protective clothing, gloves, eyewear, and respirator.

MOVING PARTS HAZARD

Moving parts, such as the fluid needle, can pinch fingers. Parts of the Metering Valve are spring-

loaded and parts may fly out or spring apart when the valve is disassembled and cause serious injury,

including eye injuries.

Do not operate the equipment with the guard removed.

Keep clear of any moving parts when starting or operating the equipment.

Wear eye protection during all service procedures.

4 309382

Installation

WARNING

ELECTRIC SHOCK HAZARD

Installing and servicing this equipment

requires access to parts which could

cause an electric shock or other serious

injury if the work is not performed properly. Do not

install or service this equipment unless you are

trained and qualified.

NOTES:

Have the system binder (a collection of manuals

and diagrams in a three-ring binder, supplied by

Graco) available during installation.

Reference numbers and letters in parentheses in

the text refer to the numbers and letters in the

illustrations.

Be sure all accessories are adequately sized and

pressure-rated to meet the system’s requirements.

Only use the PrecisionFlo XL Metering Valve with

the PrecisionFlo XL Control.

1. Mount the Metering Valve. See the mounting hole

dimensions in Fig. 1.

2. Connect the fluid supply line to the 1/4–14 npt fluid

inlet (A). See Fig. 2.

3. Connect a fluid line between the 1/4–14 npt fluid

outlet (B) and the dispensing device.

4. Connect the electrical cable (C) to the Metering

Valve connector (E).

5. Connect a 0.25 inch (6.35 mm) O.D. air line be-

tween the closer air inlet (G) and the closer actuat-

ing air valve.

WARNING

FIRE, EXPLOSION, AND ELECTRIC

SHOCK HAZARD

To reduce the risk of fire, explosion, or

electric shock the Metering Valve must

be grounded through proper connection

of the two electrical cables.

A qualified electrician must complete all

grounding and wiring connections.

Fig. 1 05478

A A=19 in.

(482.6 mm)

B B= 6.913 in.

(175.6 mm)

C C= 7.15 in.

(181.6 mm)

D D= 1.25 in.

(31.8 mm)

E E= 4 in.

(102 mm)

FF = 4 x 1/4–20 in.

Fig. 2

TI1394A

309382 5

Operation and Maintenance

Pressure Relief Procedure

WARNING

INJECTION HAZARD

The system pressure must be manually

relieved to prevent the system from

starting or dispensing accidentally. Fluid

under high pressure can be injected 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

Are instructed to relieve the pressure

Stop dispensing

Check or service any of the system equipment

Install or clean a spray tip or nozzle

1. Shut off the fluid supply to the Metering Valve.

2. Actuate the Metering Valve and the dispensing

device until the fluid stops flowing from them.

NOTE: Follow the manual purge procedure in the

PrecisionFlo XL system manual to actuate the

metering valve and dispensing device.

3. Relieve the system pressure as instructed in the

separate instruction manuals.

Operating the Metering Valve

The Metering Valve is operated through the

PrecisionFlo XL Control. Follow the PrecisionFlo XL

Control instructions to operate the Metering Valve.

WARNING

MOVING PARTS HAZARD

Moving parts, such as the fluid needle,

can pinch fingers. Do not operate the

equipment with the guard (51) removed.

Maintenance

Visually check the following items periodically:

Check the fluid needle and seat area for leakage

and wear.

Check the fluid needle shaft for leakage and wear.

Make sure the fluid connections are tight and are

not leaking.

Check the cables for damage and make sure they

are securely connected.

Clean the Fluid Needle and Seat Assembly

If the fluid flow from the dispensing device appears to

be restricted, disassemble the fluid needle and seat as

instructed on page 7 and clean the parts. Use a

non-flammable cleaning fluid that is recommended by

your material supplier.

6 309382

Service

Troubleshooting the Metering Valve

WARNING

EQUIPMENT MISUSE HAZARD

Do not disassemble the Metering Valve motor. The

motor contains powerful magnets, which could

attract metal objects and create a hazardous

condition if the motor end plates are removed.

Contact your Graco distributor for motor service.

WARNING

MOVING PARTS HAZARD

Parts of the Metering Valve are spring-

loaded and parts may fly out or spring

apart when the valve is disassembled

and cause serious injury, including eye injuries.

Wear eye protection during all service procedures.

Follow the instructions, paying special attention

when you see the Moving Parts Hazard symbol in

this warning.

1. If the fluid continues to flow after the dispense

cycle has stopped, check for the following prob-

lems:

a. The fluid needle may be obstructed or dam-

aged. Service the fluid needle as instructed on

page 7.

b. The seat or seals may be worn or damaged.

Service the fluid needle as instructed on

page 7.

c. Refer to the PrecisionFlo XL system binder,

244994.

2. Refer to the wiring diagram in Fig. 7, page 12, for

cable wire connections.

309382 7

Service

Fluid Needle and Seat Assembly Service

WARNING

INJECTION HAZARD

To reduce the risk of a serious injury,

including an injection injury, follow the

Pressure Relief Procedure on page 5

before checking or servicing the equipment and

whenever you are instructed to relieve the pres-

sure.

NOTE: Repair Kits 233680 and 233681 are available.

Reference numbers followed by an asterisk (such as

52*) in the following instructions and Fig. 3 are in-

cluded in the kits. Discard the old parts as you replace

them.

1. Relieve the pressure in the system.

2. Disconnect the electrical cable (C) from the Meter-

ing Valve connector (E). See Fig. 2, page 4.

3. Disconnect the fluid lines from the metering valve

fluid inlet (A) and outlet (B). See Fig. 3.

4. Disconnect the closer air line from the closer air

inlet (G).

5. Remove the Metering Valve and take it to a clean

work area with a compressed air supply.

6. Connect a compressed air supply to the closer air

inlet (G). Actuate the cylinder with approximately

50 psi (3500 kPa, 3.5 bar) air pressure to retract

the closer rod and keep the closer spring com-

pressed.

WARNING

MOVING PARTS HAZARD

The valve air cylinder is spring-loaded

and parts may fly out or spring apart

when the valve is disassembled and

cause serious injury. During service procedures

that will expose internal meter parts, wear protec-

tive eyewear and keep the closer spring com-

pressed, as instructed in step 6.

7. Disconnect the pressure sensor cables (K) from

the connector (L).

8. Remove the guard (51).

9. Slide the rubber boot (52*) back to expose the two

set screws (39*).

10. Disconnect the fluid needle (53) from the connec-

tor (40) by unscrewing the two set screws (39*).

11. Remove the screws (47), and separate the fluid

section from the fluid head support (48).

12. Remove the rubber boot (52*).

13. Separate the fluid body (36) and adapter (35).

14. Remove the seat (54*) and fluid needle (53*).

15. Unscrew the seal housing (41*).

16. Remove the seals (42*, 43*), o-rings (45*), washer

(38*) and bushing (37*).

17. Clean the parts in a non-flammable cleaning fluid

that is recommended by your material supplier.

Replace parts as needed.

NOTE: Use lithium-based grease to lubricate o-rings

and seals.

18. Lubricate the seal (orange) (43*) and press the

seal into the fluid body (36) with the lips of the seal

facing into the fluid body.

19. Install the washer (38*) on top of the seal (43).

8 309382

Service

20. Lubricate the seal (black) (42*) and press into the

bushing (37*), with the lips of seal facing into the

bushing.

21. Install the o-ring (45*) on the end of the bushing

(37*).

22. Install the bushing (37*) into the fluid body (36),

with the o-rings facing into the fluid body.

23. Screw the seal housing (41*) into the fluid body

(36).

24. Lubricate the fluid needle (53*) shaft. Turn the

needle as you install the shaft through the fluid

body (36), seals (42*, 43*), and bushing (37*).

25. Install the o-rings (44*, 45*) and lubricate them.

26. Press and turn the seat (54*) into the fluid body

(36).

27. Replace the rubber boot (52*) over the connector

(40) and secure end to the motor face plate. Slide

boot back to expose set screw holes.

28. Press the fluid body (36) and adapter (35) togeth-

er. Secure them with the four screws (47) and split

lock washers (50). Torque the screws to 32 in-lb

(3.6 Nm).

29. Slowly relieve the air pressure from the Metering

Valve to release the closer.

CAUTION

The motor shaft is forced to the full forward position

by the closer. Slowly relieve the air pressure to

prevent excessive impact of the shaft, which could

damage the equipment.

30. Finger-tighten one set screw (39*) on the connec-

tor (40). Tighten the second set screw and torque

it to 15 in-lbs (1.7 Nm). Retighten the first set

screw and torque to 15 in-lbs (1.7 Nm).

31. Slide the rubber boot (52) back to cover the set

screws (39), making sure the end is still secured

over the motor face plate.

32. Install the guard (51).

33. Connect the pressure sensor cables (K) to the

connector (L).

34. Mount the Metering Valve.

35. Connect the fluid lines to the metering valve fluid

inlet (A) and (B).

36. Connect the closer air line to the closer air

inlet (G).

37. Turn on the fluid supply.

38. Re-calibrate the PrecisionFlo XL system. See the

PrecisionFlo XL Control manual.

309382 9

Service

Lubricate all o-rings and seals with lithium-based

grease prior to installation.

Do not service the motor. Contact a Graco distributor

for service.

Lubricate shaft end of needle (53) with lubricant to

ease insertion. After assembly, remove lubricant.

Torque to 50 in-lbs (5.7 Nm).

Fig. 3

Part No. 244920 shown

1 

43*

53*

44*

54*

45*

47

TI1385A

39*

38*

45*

37*

42* 

41*

52*

10 309382

Service

Closer Service

WARNING

INJECTION HAZARD

To reduce the risk of a serious injury,

including an injection injury, follow the

Pressure Relief Procedure on page 5

before checking or servicing the equipment and

whenever you are instructed to relieve the pres-

sure.

1. Relieve the pressure in the system.

2. Disconnect the electrical cable (C) from the Meter-

ing Valve connector (E). See Fig. 2, page 4.

3. Disconnect the fluid lines from the metering valve

fluid inlet (A) and outlet (B).

4. Disconnect the closer air line from the closer air

inlet (G). See Fig. 4.

5. Unmount the Metering Valve and take it to a clean

work area with a compressed air supply.

6. Connect a compressed air supply to the closer air

inlet (G). Actuate the cylinder with about 50 psi

(3500 kPa, 3.5 bar) air pressure to retract the

closer rod and keep the closer spring compressed.

WARNING

MOVING PARTS HAZARD

The valve air cylinder is spring-loaded

and parts may fly out or spring apart

when the valve is disassembled and

cause serious injury. During service procedures

that will expose internal meter parts, wear protec-

tive eyewear and keep the closer spring com-

pressed, as instructed in step 6.

7. Remove the eight screws (28) from the closer

assembly (19), and remove the closer assembly.

See Fig. 4.

8. Slowly relieve the air pressure from the Metering

Valve to release the closer.

9. Disconnect the air line from the closer air inlet (G).

10. Press down on the cylinder body cover to prevent

the parts from springing apart, and remove the

screws (111) from the closer cover. See Fig. 5.

11. Remove the cylinder cap (102) from the cylinder

(104).

12. Remove the o-rings (109) from the cover (105).

WARNING

MOVING PARTS HAZARD

The rod extension (103) and spring cup

(112) may fly apart as the rod extension

is unscrewed from the cylinder rod (R),

due to the pressure from the spring (107). Wear

eye protection to reduce the risk of serious injury

from moving parts.

Fig. 4

TI1392A

Fig. 5

104

103

TI1392A

111

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