Graco 309133c User Manual
Instructions
Parts
Pressure
Compensating Valve
The pressure compensating valve minimizes the effects of pressure changes from the fluid source and
reduces or eliminates material flow variances caused by piston pump changeover and unbalanced
pump lowers. Eliminating surge variations adds consistency to the application process.
The pressure compensating valve is used:
in applications requiring a consistent bead size throughout the dispense cycle.
to overcome the initial surge of material when the dispense valve is opened in a deadhead system.
with single component materials when viscosities are generally greater than 100,000 cps.
Read warnings and instructions.
See page 2 for compensator part nos., ratios,
and working pressures.
309133C
Model 243656 Shown
TI0368B
GRACO INC.ąP.O. BOX 1441ąMINNEAPOLIS, MNą55440-1441
Copyright 2000, Graco Inc. is registered to I.S. EN ISO 9001
Table of Contents
Symbols 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warnings 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compensator Models 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unpacking and Repacking 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Parts List 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Diagram 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Repair Kits and Accessories 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Technical Data 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Warranty 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Graco Phone Number 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Compensator Models
Maximum Operating Air
Pressure
Ratio and Type
Part No. Series
243206 A 51:1 , Heated 120V 0.7, 7.0 (100) 23.8 , 238 (3500)
243654 A 51:1 Ambient 0.7, 7.0 (100) 23.8, 238 (3500)
243655 A 23:1 Ambient 0.7, 7.0 (100) 17.2 , 172.4 (2500)
243656 A 23:1, Heated 240 V 0.7, 7.0 (100) 17.2, 172.4 (2500)
243657 A 51:1, Heated 240 V 0.7, 7.0 (100) 23.8, 238 (3500)
243658 A 23:1, Heated 120V 0.7, 7.0 (100) 17.2, 172.4 (2500)
(parts list page)
MPa, bar (psi) MPa, bar (psi)
Maximum Operating Fluid
Pressure
2 309133
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
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.
Do not alter or modify this equipment. Use only genuine Graco parts and accessories.
Caution Symbol
CAUTION
This symbol alerts you to the possibility of damage to
or destruction of equipment if you do not follow the
instructions.
Check equipment daily. Repair or replace worn or damaged parts immediately.
Do 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.
Use 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.
Do not use hoses to pull equipment.
Route hoses away from traffic areas, sharp edges, moving parts, and hot surfaces. Do not expose
Graco hoses to temperatures above 82C (180F) or below –40C (–40F).
Wear hearing protection when operating this equipment.
Do not lift pressurized equipment.
Comply with all applicable local, state, and national fire, electrical, and safety regulations.
309133 3
WARNING
FIRE AND EXPLOSION HAZARD
Improper grounding, poor ventilation, open flames or sparks can cause a hazardous condition and result in a fire or explosion and serious injury.
Ground the equipment and the object being sprayed. Refer to Grounding on page 8.
If there is any static sparking or you feel an electric shock while using this equipment, stop spray-
ing/dispensing immediately. Do not use the equipment until you identify and correct the problem.
Provide fresh air ventilation to avoid the buildup of flammable fumes from solvents or the fluid be-
ing sprayed/dispensed.
Keep the spray/dispense area free of debris, including solvent, rags, and gasoline.
Electrically disconnect all equipment in the spray/dispense area.
Extinguish all open flames or pilot lights in the spray/dispense area.
Do not smoke in the spray/dispense area.
Do not turn on or off any light switch in the spray/dispense area while operating or if fumes are
present.
Do not operate a gasoline engine in the spray/dispense 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.
Know the specific hazards of the fluid you are using.
Store hazardous fluid in an approved container. Dispose of hazardous fluid according to all local,
state and national guidelines.
Always wear protective eyewear, gloves, clothing and respirator as recommended by the fluid and
solvent manufacturer.
HOT SURFACE AND FLUID HAZARD
Heated fluid can cause severe burns and can cause equipment surfaces to become very hot.
Wear protective gloves and clothing when operating this equipment in a heated system.
Do not touch the metal heat sink when the surface is hot.
Allow the equipment to cool thoroughly before servicing.
Some heated systems are designed to dispense PUR heated materials. PUR systems are supplied
with ventilation hoods, and require proper ventilation and specially designed system components.
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WARNING
MOVING PARTS HAZARD
Moving parts, such as the air motor piston, can pinch or amputate your fingers.
Keep clear of all moving parts when starting or operating the pump.
Before servicing the equipment, follow the Pressure Relief Procedure on page 10 to prevent the
equipment from starting unexpectedly.
INJECTION HAZARD
Spray from the gun, 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.
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 spray gun at anyone or at any part of the body.
Do not put hand or fingers over the spray tip.
Do not stop or deflect fluid leaks with your hand, body, glove, or rag.
Do not “blow back” fluid; this is not an air spray gun.
Check the gun diffuser operation weekly.
Be sure the gun trigger safety operates before spraying.
Lock the gun trigger safety when you stop spraying.
Follow the Pressure Relief Procedure on page 10 whenever you: are instructed to relieve pres-
sure; stop spraying; clean, check, or service the equipment; or install or clean the spray tip.
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.
309133 5
Unpacking and Repacking
Unpacking the Product
The pressure compensating valve was carefully packaged for shipment by Graco. When the product arrives, perform the following procedure to unpack the
unit:
1. Inspect the shipping box carefully for shipping
damage. Contact the carrier promptly if damage is
discovered.
2. Unseal the box and inspect the contents carefully.
There should not be any loose or damaged parts.
3. Compare the packing slip against all items included in the container. Any shortages or other
inspection problems should be reported immediately.
4. Store the box and packing materials in a safe
place for future use. Graco recommends that all
packing materials be saved in case the unit needs
to be shipped again.
6 309133
Overview
Description
The purpose of the pressure compensating valve is to
provide a consistent flow of sealant and adhesive
material downstream, through a hose, to a dispense
valve and nozzle.
The pressure compensating valve applies a precisely
regulated air pressure to a rolling diaphragm to open a
valve spool. Downstream back pressure is applied to
the opposite end of the spool to push it closed. The
two opposing forces cause the spool to throttle the
material through a tapered valve seat, thereby compensating for any pressure fluctuation.
The area of the spool and the 1” (25.5 mm) stroke of
the spool cause it to displace material. When the
spool extends into the downstream end of the pressure
compensating valve it can provide up to 1.0 cu. inches
of material to compensate for the momentary loss of
supply pressure. When the spool is retracted beyond
the point of shutoff, it will withdraw material from the
downstream end. This causes a relieving effect.
The displacement of the spool is what separates it
from regulators. The inlet pressure is balanced against
the spool, thus making it immune to changes in upstream pressure. The air cylinder (rolling diaphragm)
area versus the area of the end of the spool, give the
pressure compensating valve a power ratio, just as a
reciprocating pump has a power ratio. The Pressure
Compensating Valve is available in 23:1 and 51:1
ratios, ambient or heated models.
Because the inlet pressure is balanced, a low ratio
pressure compensating valve may be used with a high
ratio pump. Optimum operation will be reached by
using the lowest ratio pressure compensating valve to
provide the required pressure.
Operation
The pressure compensating valve is installed with a
precision air regulator for the air cylinder in order to
provide accurate control. It is also installed with inlet
and outlet fluid pressure gauges. To avoid extreme
wear, when dispensing material, do not exceed 300 psi
differential across the pressure compensating valve
(the difference between the inlet and the outlet fluid
pressure gauges).
Typical Installation
309133 7
Installation
Ground The System
WARNING
FIRE, EXPLOSION, AND ELECTRIC
SHOCK HAZARD
To reduce the risk of fire, explosion, and
serious injury, proper electrical grounding of every part of your system is
essential. Read the warning section,
FIRE AND EXPLOSION HAZARD, on
page 4 and follow the grounding instructions, below.
The following grounding instructions are minimum
requirements for a basic dispensing system. Your
system may include other equipment or objects which
must be grounded. Check your local electrical code
for detailed grounding instructions for your area and
type of equipment. Your system must be connected to
a true earth ground.
1. Pump: ground the pump by connecting a ground
wire and clamp as described in your separate
pump instruction manual.
2. Air compressors and hydraulic power
supplies: ground the equipment according to the
manufacturer’s recommendations.
7. All solvent pails used when flushing: ground
according to local code. Use only metal pails,
which are conductive. Do not place the pail on a
non–conductive surface, such as paper or
cardboard, which interrupts the grounding
continuity.
8. To maintain grounding continuity when
flushing or relieving pressure: hold a metal part
of the gun firmly to the side of a grounded metal
pail, then trigger the gun.
General Information
NOTE: Reference numbers and letters in parentheses
in the text refer to the callouts in Fig. 1.
A pressure compensating valve can be used in manual
and automatic dispensing applications.
WARNING
ELECTROCUTION HAZARD
Installing and servicing this equipment
requires access to parts which could
cause an electric shock or other serious
injury. Have only qualified electricians access the
control assembly.
Location of the Pressure Compensating
Valve
3. Fluid hoses: use only ground fluid hoses with a
maximum of 500 feet (150 m) combined hose
length to ensure grounding continuity. Check the
electrical resistance of your fluid hoses at least
once a week. If your hose does not have a tag on
it which specifies the maximum electrical
resistance, contact the hose supplier or
manufacturer for the maximum resistance limits. If
the hose resistance exceeds the recommended
limits, replace it immediately.
4. Flo–gun: ground the gun by connecting it to a
properly grounded fluid hose and pump.
5. Fluid supply container: ground according to the
local code.
6. Flammable liquids in the dispensing area:
must be kept in approved, grounded containers.
Do not store more than the quantity needed for
one shift.
The pressure compensating valve should be lo-
cated between the supply pump and dispense
valve, as close to the point of disperse as possible.
CAUTION
Downstream hose lengths beyond 15 feet will start to
diminish the valve’s effectiveness in compensating
for surge.
WARNING
PRESSURIZED EQUIPMENT HAZARD
To reduce risk of injury or equipment
damage:
Make sure all material hose connec-
tions are secure.
Do not pressurize the system until
you have verified the system is ready
and it is safe to do so.
8 309133
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