Graco 306640E User's Manual
Contents
1. 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 equipment 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 their2. valve for the best combination of spraying pressure and fluid circulation To adjust the back pressure valve loosen the locknut 27 and insert the hex key wrench 7 into the socket on the adjusting screw 26 Turn the screw clockwise to increase pressure in the return line Turn the screw counterclockwise to decrease pressure in the return line Lock in the adjust ment by tightening the locknut 27 NOTE Always check and adjust the back pressure valve if you make changes to the system such as a change of fluids the length of the lines and the number of spray guns Flush the valve with a compatible solvent whenever the rest of the system is being flushed Fully open the valve before flushing by turning the adjustment screw counterclockwise Always use the lowest possible pressure when flushing Service NOTE Clean and check the valve regularly to maintain it in good working condition Refer to the Parts drawing on page 3 1 Remove the valve from the system 2 Disassemble the pressure gauge 5 and the tube 16 from the inlet adapter 22 Remove the inlet adapter and the outlet union 11 from the housing 25 3 Unscrew the cap 28 from the housing 25 Remove the adjusting screw 26 and the locknut 27 4 Remove the spring plate 15 and the spring 13 5 Loosen the cap nut 4 Disassemble the diaphragm and its related parts 2 10 18 19 20 21 A CAUTION Be careful not to damage the valve s
3. 796 SPRING compression 1 15 160 180 PLATE spring 1 16 160 745 TUBE fluid gauge 1 18 189 816 PLATE backup 1 19 177 430 GASKET valve 1 20 177 432 DIAPHRAGM PLATE support 1 21 7 177 431 DIAPHRAGM 1 22 162 265 INLET ADAPTER 3 8 18 npsm m 3 8 18 npt m 1 4 18 npt f 1 25 162 811 VALVE HOUSING 1 26 112 844 ADJUSTING SCREW 1 2 20 x 1 5 8 inch long 1 27 100 111 LOCKNUT 1 2 20 1 28 189 815 REGULATOR CAP 1 TO PLACE AN ORDER contact your Graco distributor or Graco Phone Number i Keep these spare parts on hand to reduce down time Manual Change Summary call this number to identify the distributor closest to you Assembly Part Ref Part No Name 1 800 367 4023 Toll Free Changed Status No 205 122 212 030 Series to C New 236 893 101 180 187 876 Maximum inbound fluid pressure is increased to 300 psi 21 bar 2 1 MPa 306 640 3 Technical Data Dimensions Maximum inbound fluid pressure 300 psi 21 bar 2 1 MPa Height A 2 1 eee eee eee inch 178 mm Regulated pressure range 0 180 psi 0 1 2 4 bar 1 24 MPa Width C a a a a a Cindi E Atay Ae ae Eae Soe eae 5 inch 127 mm Valve orifice diameter 0 156 inch 3 96 mm Fluid inlet B 0 eee e eect eet eee eee 3 8 npsm m Approximate maximum Fluid QUITE GD ais a ateskcrare la ead ate ste tet ss ie
4. back pressure to spray guns and to maintain the proper circulating pressure throughout the system The valve is adjustable to control fluid pressure in a circulat ing system from 0 to 180 psi 0 to 12 4 bar 0 to 1 24 MPa 4 CAUTION To prevent damage to the diaphragm the hard carbide seat and stem and other sensitive parts handle the valve care fully Install the valve in the return line of the spray guns down stream from the last gun See Fig 1 Connect the return line to the 3 8 npsm m inlet 22 and the 3 8 npsm f outlet 11 Be sure the connections match the direction of fluid flow in the line See Fig 2 3 Pa B A _ D aie i m i D Fig 1 04521 2 306 640 1 T Fig 2 04520 Operation The back pressure valve controls pressure in the fluid return line Adjust the pump pressure and the back pressure
5. 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 acknowledge 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 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 Sales Offices Minneapolis Detroit Los Angeles Foreign Offices Belgium Canada England Korea France Germany Hong Kong Japan GRACO INC P O BOX 1441 MINNEAPOLIS MN 55440 1441 PRINTED IN U S A 306 640 October 1958 Revised June 1997 4 306 640
6. 3 8 nosm f flow capacity 0ccceceeeeeee 2 gpm 7 6 liter min Diameter E 0 00 2 44 inch 51 28 mm Wetted parts 303 stainless steel plated steel brass tungsten carbide buna N impregnated nylon PTFE elastomer treated cellulose fiber f A E gt D i cm a 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 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
7. INSTRUCTIONS PARTS LIST 9 This manual contains important warnings and information READ AND KEEP FOR REFERENCE INSTRUCTIONS Back Pressure Valve 306 640 L Rev E RRES Supersedes D First choice when quality counts 300 psi 21 bar 2 1 MPa Maximum Inbound Pressure 180 psi 12 4 bar 1 24 MPa Maximum Regulated Pressure Model 205 122 Series C 4 WARNING 9 EQUIPMENT MISUSE HAZARD Equipment misuse can cause the equipment to rupture or malfunction and result in serious injury INSTRUCTIONS e 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 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 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 Comply with all applicable local state and national fire electrical and safety re
8. eat 1 or stem 2 which are made of hard carbide Service 6 Remove the valve seat 1 and the gasket 9 from the 10 housing 25 Install the spring 13 and the spring plate 15 11 Screw the cap 28 onto the housing 25 Torque to 115 125 in lb 13 14 N m Reinstall the locknut 27 and the adjusting screw 26 into the cap 28 7 Clean all the parts with a compatible solvent Check the parts for wear or damage Replace worn or damaged parts 12 Assemble the inlet adapter 22 and the outlet union 11 8 Assemble the valve seat 1 and the gasket 9 into the into the housing housing 25 Torque to 70 80 in lb 8 9 N m 13 Assemble the gauge 5 to the pressure tube 16 Use a thread sealant to ensure a good seal Install the tube and 9 Assemble the diaphragm and the related parts as shown the gauge into the inlet adapter 22 in the parts drawing Torque the cap nut 4 to 27 33 in lb 3 1 3 7 14 Install the valve in the system Parts IS 7 Ref a No Part No Description Qty AN ee b 26 ar VW 236 893 SEAT valve 1 F x 7 21 236 894 STEM valve 1 Venter er A 4 100 529 NUT hex cap 5 16 18 1 Torque to 5 187 876 PRESSURE GAUGE 0 300 psi a ra a AN Dee e 0 21 bar 0 2 1 MPa pressure range 1 7 101 976 WRENCH hex key 3 8 1 3 E 9 189 817 GASKET copper 1 8 9 N m eS 10 154 789 GASKET copper 1 11 155 665 UNION 3 8 npt m x 3 8 nosm f swivel 1 13 157
9. gulations PRESSURIZED EQUIPMENT HAZARD Spray from the gun hose leaks or ruptured components can splash fluid in the eyes or on the skin and cause serious injury e Do not stop or deflect leaks with your hand body glove or rag Tighten all fluid connections before operating the equipment Follow the Pressure Relief Procedure on page 2 whenever you are instructed to relieve pres sure stop spraying clean check or service the equipment and install or clean the spray nozzle Pe GRACO INC P O BOX 1441 MINNEAPOLIS MN 55440 1441 HOO3 COPYRIGHT 1994 GRACO INC Graco Inc is registered to I S EN ISO 9001 Pressure Relief Procedure A WARNING PRESSURIZED EQUIPMENT HAZARD The system pressure must be manually relieved to prevent the system from starting or spraying accidentally To reduce the risk of an injury from accidental spray from the gun splashing fluid or moving parts follow the Pressure Relief Procedure whenever you are instructed to relieve the pressure e stop spraying e check or service any of the system equipment or install or clean the spray nozzle 1 Shut off the power to the pump If you are using an air powered pump open the bleed type master air valve 2 Trigger the gun 3 Relieve the line pressure by turning the adjusting screw 26 counterclockwise until there is no spring pressure Installation This valve is used in a circulating system to regulate the
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