Graco 308325E User Manual

Instructions

Parts

ACETAL MATERIAL, WATERBASE COMPATIBLE

Fluid Pressure Regulators

For Use In Low-Pressure Systems Only

Fluid Flow up to 0.5 gpm (1.9 lpm)

Read warnings and instructions.

Spring-Operated Regulators

100 psi (0.7 MPa, 7 bar) Maximum Inlet Pressure 3 to 30 psi (.02 to 0.2 MPa, 0.2 to 2.1 bar) Regulated Pressure Range

Model 236081, Series A

with no pressure gauge

Model 236449, Series A

with stainless steel pressure gauge 30 psi (0.2 MPa, 2.1 bar) gauge

Model 241976, Series A

with stainless steel pressure gauge 60 psi (0.4 MPa, 4.1 bar) gauge

_____________________________________

100 psi (0.7 MPa, 7 bar) Maximum Inlet Pressure 20 to 100 psi (.14 to 0.7 MPa, 1.4 to 7 bar) Regulated Pressure Range

Model 236216, Series A

with no pressure gauge

Model 236450, Series A

with stainless steel gauge 100 psi (0.7 MPa, 7 bar) gauge

The fluid supply system main line pressures often exceed the pressure range of the gauge supplied with regulator 236449. Exposing this gauge to excessive pressure can damage the gauge, causing inaccurate readings, and the needle will not return to zero. Such damage is not covered by the Graco warranty.

CAUTION

308325E

02725

Air-Operated Regulators

100 psi (0.7 MPa, 7 bar) Maximum Inlet Pressure 3 to 100 psi (.02 to 0.7 MPa, 0.2 to 7 bar) Regulated Pressure Range

Model 238159, Series A

with no pressure gauge

Model 236281, Series A

with stainless steel gauge 100 psi (0.7 MPa, 7 bar) gauge

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

Table of Contents

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

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

Operation 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Service 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Parts 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Repair Kits 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Accessories 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dimensions 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Technical Data 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Performance Charts 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

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

Symbols

Warning Symbol

WARNING

This symbol alerts you to the possibility of serious injury or death 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.

INSTRUCTIONS

D This equipment is for professional use only.

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

D Use the equipment only for its intended purpose. If you are not sure, call your Graco distributor.

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

D Check equipment daily. Repair or replace worn or damaged parts immediately.

Caution Symbol

CAUTION

This symbol alerts you to the possibility of damage to or destruction of equipment if you do not follow the instructions.

D Do not exceed the maximum working pressure of the lowest rated component in your system. Do

not exceed 100 psi (0.7 MPa, 7 bar) maximum fluid inlet pressure of the regulator or the maximum working pressure of the lowest-rated component in your system.

D 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.

D Always wear protective eyewear, gloves, clothing, and respirator as recommended by the fluid and

solvent manufacturer.

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

3083252

WARNING

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.

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

medical attention.

D Do not point the gun at anyone or at any part of the body.

D Do not put your hand or fingers over the spray gun tip or extruder gun tip.

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

D Always have the tip guard and the trigger guard on the gun when spraying.

D Check the gun diffuser operation weekly. Refer to the gun manual.

D Be sure the gun trigger safety operates before spraying.

D Lock the gun trigger safety when you stop dispensing.

D Follow the Pressure Relief Procedure on page 4 if the spray tip clogs and before cleaning,

checking, or servicing the equipment.

D Tighten all fluid connections before operating the equipment.

D Check the hoses, tubes, and couplings daily. Replace worn or damaged parts immediately. Do not

repair high pressure couplings; you must replace the entire hose.

D Fluid hoses must have spring guards on both ends to help protect them from rupture caused by

kinks or bends near the couplings.

TOXIC FLUID HAZARD

Graco does not manufacture or supply the reactive chemical components that may be used in this equipment and is not responsible for injury or property loss, damage, expense or claims (direct or consequential) that arise from the use of such chemical components.

United States Government safety standards have been adopted under the Occupational Safety and Health Act. You should consult these standards––particularly the General Standards, Part 1910 and the Construction Standards, Part 1926.

308325 3

Installation

Introduction

Fluid pressure regulators are used for accurate, positive control of the fluid pressure to spray guns, dispensing valves or atomizing heads.

Regulators installed at circulating line take-offs or pumps are used to reduce main line pressure and maintain the desired fluid pressure to the spray gun or atomizing head.

Before Installing the Fluid Regulator

1. Determine where to locate the regulator.

2. Install a ball valve for the regulator inlet and outlet.

3. Install temporary plumbing between the ball valves.

4. Thoroughly flush the system to remove metal chips and other contaminants and to check for leaks.

Installing the Fluid Regulator

1. See Figs. 1 and 2 on page 5. Install one regulator for each spray gun. Mount the regulator in a vertical position for the best flow and minimum pigment settling. The gauge, if used, must be mounted vertically. If the regulator is mounted horizontally, an elbow must be used so the gauge will be vertical.

2. Put sealer on threaded connections, except on swivel unions as it interferes with the swivel action.

3. Flush and test the entire system. Be sure to follow the flushing procedure on page 6.

CAUTION

Pressure Relief Procedure

WARNING

INJECTION HAZARD

The system pressure must be manually relieved to prevent the system from

starting or spraying 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

D Are instructed to relieve the pressure

D Stop spraying

D Check or service any of the system equipment

D Install or clean the spray tips

1. Shut off the pump.

2. Close the fluid regulator’s inlet ball valve (B). Refer to Fig.1, page 5.

3. Relieve fluid pressure in the fluid regulator by triggering the spray gun.

4. In spring-operated regulators, turn the adjustment handle (1) counterclockwise until the spring force is relieved.

If you suspect that the spray tip or hose is completely clogged, or that pressure has not been fully relieved after following the steps above, very slowly loosen the

tip guard retaining nut or hose end coupling and relieve pressure gradually, then loosen completely, then clear the tip or hose.

Avoid overtightening threaded connections into the regulator’s plastic inlet and outlet threads. Check to be sure the threaded connections are tight and leak-free, but do not overtighten!

3083254

Installation

Spring-Operated Regulator Installation

Models 236081, 236216 (without gauge)

236449, 236450, 241976 (with gauge)

KEY

A Fluid supply

B Inlet ball valve

C Outlet ball valve

D Air filter and regulator

E Back pressure valve

F Fluid return

G Air supply

1 Regulator adjustment handle

Fig. 1

Pilot Regulator Air Supply Line Air-Operated Regulator Installation

Model 238159 (without gauge) Model 236281 (with gauge)

KEY

A Fluid supply

B Inlet ball valve

C Outlet ball valve

D Air filter, regulator, and

moisture separator

E Air supply

02726

Fig. 2

0272

308325 5

Operation

CAUTION

D The new system must be cleaned and tested

thoroughly before admitting fluid to the regulator to avoid contaminants clogging or damaging the regulator.

D Always use the lowest possible air and fluid

pressures for your application. High pressures can cause premature spray tip, regulator, and pump wear.

NOTE: Reference numbers and letters in parentheses in the text refer to Figs.1 through 5 and the Parts Drawings.

Air Operated Regulators

1. Start the pump and open the fluid regulator’s inlet ball valve (B) to admit fluid to the regulator. See Fig. 2.

2. Increase the air pressure to obtain the desired fluid pressure. Before reducing the regulator pressure, partially relieve pressure in the gun hose to ensure the correct gauge reading.

NOTE: Make sure the air bleed hole (J) in the air line fitting (2) is not plugged. Refer to Fig. 4. For the best results, use an air regulator with at least a two inch diameter diaphragm to control this fluid regulator.

Flushing Procedure

Regulating Fluid Pressure

Spring Operated Regulators

1. Close the regulator: turn the adjustment handle (1) counterclockwise to relieve the spring tension. See Fig. 3.

2. Start the pump and open the fluid regulator’s inlet ball valve (B) to admit fluid to the regulator. See Fig. 1.

3. Turn the adjustment handle (1) clockwise to increase fluid pressure. See Fig. 3. Adjust for the desired spray pattern. Before reducing the

regulator pressure, partially relieve pressure in the gun hose to ensure the correct gauge reading. Tighten the jam nut (3) to the regulator cap (5) to ensure the proper pressure setting.

1. Flush the regulator with a compatible solvent whenever the rest of the system is flushed.

2. Remove the gauge if the fluid pressure will exceed the gauge range.

3. Spring Operated Regulators Only

a. Shut off the pump and relieve fluid pressure in

the system by opening the back pressure valve (E) or other bypass valve. See Fig. 1.

b. Turn the adjustment handle (1) clockwise to

open the regulator valve to the desired flushing outlet pressure and flow. See Fig. 3.

4. Air Operated Regulator Only

a. Increase the air pressure to obtain desired

fluid flushing pressure.

b. Make sure the air bleed hole (J) in the air line

fitting (2) is not plugged. Refer to Fig. 4.

5. Flush until thoroughly clean. Always use the lowest possible pressure when flushing.

Fig. 3

6. Spring Operated Regulators Only

0272

3083256

After flushing, turn the adjustment handle (1) counterclockwise to the previous pressure setting. Partially relieve pressure in the gun hose to ensure the correct gauge reading.

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