Graco 308401E User's Manual
Contents
1. pr AT mw casos KEY A Fluid Supply Line F Back Pressure Regulator B Air Spray Gun 236770 shown C Fluid Pressure Regulator G Fluid Return Line D Air Supply Line H Ball Valve E Adjusting Screw A T J x Ea 4 OS n D G AA IK cH H ql EL H mm Fig 1 Installing the Back Pressure Regulator 4 CAUTION Handle the back pressure valve with care to avoid damaging the diaphragm Install the back pressure regulator in the spray gun return line See Fig 1 Connect the line to the inlet and outlet Make sure the flow direction agrees with the IN and OUT markings on the bottom of the regulator body The back pressure regulator is adjustable to control the fluid pressures in a circulating system from 5 to 180 psi 0 3 to 12 4 bar 03 to 1 24 MPa If more than one spray station is used install the back pressure regulator in the fluid supply line after the last station This will help maintain proper circulating pressures in the system Operation NOTE The back pressure regulator controls pressure ahead of its intake Turn the adjusting screw clockwise to increase pres sure and counterclockwise to decrease pressure Adjust the pump pressure and back pressure regulator for the best spraying combination and for proper circulation of fluid F2. workmanship on the date of sale by an authorized Graco distributor to the original purchaser for use With the exception of any special extended or limited warranty published by Graco Graco will for a period of twelve months from the date of sale repair or replace any part of the equipment determined by Graco to be defective This warranty applies only when the equipment is installed operated and maintained in accordance with Graco s written recommendations This warranty does not cover and Graco shall not be liable for general wear and tear or any malfunction damage or wear caused by faulty installation misapplication abrasion corrosion inadequate or improper maintenance negligence accident tampering or substitution of non Graco component parts Nor shall Graco be liable for malfunction damage or wear caused by the incompatibility of Graco equipment with structures accessories equipment or materials not supplied by Graco or the improper design manufacture installation operation or maintenance or structures accessories equipment or materials not supplied by Graco This warranty is conditioned upon the prepaid return of the equipment claimed to be defective to an authorized Graco distributor for verification of the claimed defect If the claimed defect is verified Graco will repair or replace free of charge any defective parts The equipment will be returned to the original purchaser transportation prepaid If inspection of the equipm
3. 3 8 npsm f Model 236770 shown Outlet Fig 2 03505 Manual Change Summary Assembly Part Ref PartNo Name Changed Status No 236770 and Old 20 187873 Gauge 237503 to New 20 187876 Gauge Series B Maximum inbound pressure is increased to 300 psi 21 bar 2 1 MPa Technical Data Maximum Inlet Pressure 300 psi 21 bar 2 1 MPa Regulated Pressure Range 5 180 psi 0 3 12 4 bar 03 1 24 MPa 236770 Inlet Size oooooooooo 3 8 npsm m 236770 Outlet Size oooo o o 3 8 npsm f 237903 are 3 8 npt f 237503 Outlet 2 eee eee 1 2 npt f 236770 Weight 005 3 5 Ib 1 6 kg 237503 Weight 006 2 4 lb 1 1 kg Wetted Parts 316 stainless steel tungsten carbide with nickel binder acetal and PTFE Maximum flow chart for 180 psi 12 4 bar 1 24 MPa inbound pressure and fluid viscosity of 65 cps Regulated Pressure Maximum Flow Rate 50 psi 3 4 bar 0 3 MPa 4 7 gpm 17 8 lpm 100 psi 7 bar 0 7 MPa 4 3 gpm 16 3 lpm 150 psi 10 3 bar 3 7 gpm 12 9 lpm 1 0 MPa Accessories Air Charge Conversion Kit 237448 Includes necessary parts to convert back pressure regulator from spring operated to air operated 308401 7 The Graco Warranty and Disclaimers Graco warrants all equipment listed in this manual which is manufactured by Graco and bearing its name to be free from defects in material and
4. Instructions Parts List GRACO STAINLESS STEEL WATERBASE COMPATIBLE 308401E Back Pressure Regulator ENG For use in circulating systems to provide regulated back pressure to spray gun s and to maintain proper system pressure Model 237503 is the back pressure regulator only Model 236770 includes the gauge tube inlet adapter and outlet swivel union 300 psi 21 bar 2 1 MPa Maximum Inbound Pressure 180 psi 12 4 bar 1 24 MPa Maximum Regulated Pressure N gt AU Model 236770 Series B Model 237503 Series B Important Safety Instructions Read all warnings and instructions in this manual Save these instructions Model 237503 03963 Table of Contents Warnings erie ee nee ee eee 2 Installation 0 0 cece nn 3 Operation occcccccccc eee 3 Service sis eee Ea eee da ee ee Lees 4 Troubleshooting 0 eee eee eee 4 Z PA S so en 5 Dimensions sssaaa 7 Technical Data 0 0c eee eee 7 Accessories see ele bride rr E 7 Warranty 2 cee eee eee Back Cover Graco Information Back Cover Model 236770 PROVEN QUALITY LEADING TECHNOLOGY 44 WARNING EQUIPMENT MISUSE HAZARD Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury ee NA INSTRUCTIONS y This equipment is for professional use only Read all instruction manuals tags and labels bef
5. cknowledge that they have required that the present document as well as all documents notices and legal proceedings entered into given or instituted pursuant hereto or relating directly or indirectly hereto be drawn up in English Les parties reconnaissent avoir convenu que la r daction du pr sente document sera en Anglais ainsi que tous documents avis et proc dures judiciaires ex cut s donn s ou intent s a la suite de ou en rapport directement ou indirectement avec les proc dures concern es Graco Information For the latest information about Graco products visit www graco com TO PLACE AN ORDER contact your Graco distributor or call to identify the distributor closest to you Phone 612 623 6921 or Toll Free 1 800 328 0211 Fax 612 378 3505 All written and visual data contained in this document reflects the latest product information available at the time of publication Graco reserves the right to make changes at any time without notice This manual contains English MM 308401 Graco Headquarters Minneapolis International Offices Belgium China Japan Korea GRACO INC P O BOX 1441 MINNEAPOLIS MN 55440 1441 Copyright 1994 Graco Inc is registered to ISO 9001 www graco com Revised 11 2009 8 308401
6. ent does not disclose any defect in material or workmanship repairs will be made at a reasonable charge which charges may include the costs of parts labor and transportation Graco s sole obligation and buyer s sole remedy for any breach of warranty shall be as set forth above The buyer agrees that no other remedy including but not limited to incidental or consequential damages for lost profits lost sales injury to person or property or any other incidental or consequential loss shall be available Any action for breach of warranty must be brought within two 2 years of the date of sale GRACO MAKES NO WARRANTY AND DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE IN CONNECTION WITH ACCESSORIES EQUIPMENT MATERIALS OR COMPONENTS SOLD BUT NOT MANUFACTURED BY GRACO These items sold but not manufactured by Graco such as electric motors gas engines switches hose etc are subject to the warranty if any of their manufacturer Graco will provide purchaser with reasonable assistance in making any claim for breach of these warranties In no event will Graco be liable for indirect incidental special or consequential damages resulting from Graco supplying equipment hereunder or the furnishing performance or use of any products or other goods sold hereto whether due to a breach of contract breach of warranty the negligence of Graco or otherwise FOR GRACO CANADA CUSTOMERS The parties a
7. f necessary 5 Check for chips or dirt that could puncture the diaphragm before assembling the regulator 6 Reassemble the diaphragm and related parts Torque the cap nut 3 to 27 to 33 in Ib 3 1 to 3 7 Nem 7 Carefully inspect the seat 1 for damage wear or dirt These things could cause the regulated pres sure to creep Replace the seat if necessary 8 Replace the seat gasket 6 when replacing the seat 1 Torque the seat to 70 to 80 in Ib 8 to 9 Nem 9 To remove or install the gauge on model 236770 20 use the wrench on the square portion of the gauge stud only 44 CAUTION Use thread sealer sparingly on the gauge s male threads when installing it to avoid plugging the gauge 10 Lubricate the adjusting screw 15 threads 11 Assemble the remaining parts 12 Tighten the regulator cap 4 to 324 to 396 in Ib 37 to 45 Nem 13 Reinstall the back pressure regulator in the fluid line Troubleshooting A WARNING To reduce the risk of serious injury whenever you are instructed to relieve pressure always follow the Pressure Relief Procedure above 4 308401 Checking the Ball and Seat The ball and seat may be checked for wear by closing the ball valve directly upstream of the back pressure regulator Fig 1 When the ball valve is closed the gauge pressure should drop slightly If the pressure continues to drop then the ball or seat is worn and needs to be replaced Follow the preced
8. ing Service procedure to replace the worn ball or seat Parts Stainless Steel Back Pressure Regulator Model 236770 Series B Includes items 1 to 20 Model 237503 Series B Includes items 1 to 15 Ref Ref No PartNo Description Qty No PartNo Description Qty 1 236893 SEAT valve 1 12 189816 PLATE backup 1 2 236894 STEM valve 1 13 177432 PLATE support diaphragm 1 3 100529 NUT hex cap 5 16 18 1 14 177431 DIAPHRAGM 1 4 189815 CAP regulator air 1 15 112844 SCREW adjusting 1 2 20 x 1 5 101976 WRENCH Allen 3 8 1 1 5 8 long 6 189817 GASKET acetal 1 17 236892 UNION adapter 1 2 14 npt m 1 74 154789 GASKET copper 1 x 3 8 18 npsm f swivel 8 16C761 HOUSING valve 1 18 16C760 ADAPTER inlet 3 8 18 1 9 157796 SPRING compression 1 npsm m 3 8 18 npt m 1 4 18 10 160180 PLATE spring 1 npt f 11 100111 NUT lock 1 2 20 1 19 187877 TUBE fluid gauge 1 20 187876 GAUGE 0 300 psi 0 21 bar 0 2 1 MPa 1 i Keep these spare parts on hand to reduce down time i 12 a a 5 i nn 15 a N 3 seers A K RO ef Y Gu i Le 1 e BS N A AN Torque 324 to 396 in Ib 37 to 45 N m SJ Cr i ZA Torque 27 to 33 in Ib 3 1 to 3 7 N m A Torque 70 to 80 in Ib 8 to 9 N m 03504 308401 5 Notes 6 308401 Dimensions 2 25 in 57 2 mm diameter 7 25 in 184 mm
9. lush the back pressure regulator with a compatible solvent whenever the rest of the system or unit is being flushed Open the back pressure regulator before flushing by turning the screw counterclockwise 308401 3 Service Pressure Relief Procedure 44 WARNING PRESSURIZED EQUIPMENT HAZARD The system pressure must be manually relieved to prevent the system from starting or spraying acci dentally To reduce the risk of an injury from acci dental spray from the gun splashing fluid or moving parts follow the Pressure Relief Proce dure whenever you e are instructed to relieve the pressure e stop spraying e check or service any of the system equipment e or install or clean the spray nozzle 1 Shut off the pump 2 Open the dispensing valve if used 3 Open the fluid drain valve to relieve all fluid pres sure having a container ready to catch the drain age Service NOTE Regular cleaning and inspection of the regula tor based upon the degree and kind of service is essential 1 Shut off the pump and open the back pressure regulator by turning the adjusting screw 15 counterclockwise until no spring pressure is felt Relieve all air and fluid pressures in the system 2 Remove the back pressure regulator from the fluid line 3 Disassemble the regulator and clean it with a suitable solvent See the parts drawing page 5 4 Carefully inspect the diaphragm 14 for cracks or other damage Replace i
10. ore 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 Check equipment daily Repair or replace worn or damaged parts immediately Do not exceed the maximum working pressure of the lowest rated component in your system This equipment has a 300 psi 21 bar 2 1 MPa maximum inbound pressure and a 180 psi 12 4 bar 1 24 MPa maximum regulated pressure Follow the Pressure Relief Procedure on page 4 if the spray tip clogs and before cleaning checking or servicing the equipment Do not stop or deflect leaks with your hand body glove or rag Be sure all equipment safety devices are operating properly before each use 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 Always wear protective eyewear gloves clothing and respirator as recommended by the fluid and solvent manufacturer Wear hearing protection when operating this equipment Comply with all applicable local state and national fire electrical and safety regulations 2 308401 Installation
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