Instructions Dispensit 715 332095A Usage Statement – Depending on valve configuration this valve can be used to dispense the following: Acrylics • Urethanes • Lubricants • UV Curables • Silicone Oil • RTV Silicone • Sealants • Epoxies • Greases • Filled Materials • Heat Sink Compounds Dispense Valve 100psi (0.69 MPa, 6.9 bar) Maximum Working Pressure No.)OartPartMeteri Important Safety Instructions Read all warnings and instructions in this manual. ng Unit Save (these instructions.
DISPENSIT® MODEL 715 DISPENSE VALVE OPERATING & MAINTENANCE MANUAL General Information................................................................................... 3 Safety Information ..................................................................................... 3 Illustration References .............................................................................. 3 General Accessories .................................................................................
GENERAL INFORMATION The Model 715 Dispense Valve is an On/Off valve designed for a continuous flow of viscous material through a dispense needle in automatic, semi-automatic or manual applications. It is shipped complete with the following: Model 715 Dispense Valve Two 3 foot (.
DESCRIPTION OF OPERATION 1. The normal “ready” state of the system is as follows: The material supply line is filled with dispensable material. The system has been purged, filling the valve with material up to the Spool (2). The Spool (2) is seated in the lower Posipak Seal (6). 2. The dispense cycle begins when the controller is activated. Air at 70 psi (4.8 bar) enters the Open port and extends the Spool (2) through the lower Posipak Seal (6). 3.
SETUP PROCEDURE MOUNTING DISPENSE VALVE Mounting holes are drilled through the valve body. The valve may be tilted to a maximum of 60 degrees from the vertical depending on the application. AIR CONTROLLER Operation of the Model 715 Dispense Valve requires a controller that can provide the following: 3 A minimum of 0.5 SCFM (2.3 cm ) of dry unlubricated air at a minimum pressure of 70 psi (4.8 bar) and a maximum of 100 psi (6.9 bar). Time delay capability to allow the valve to cycle.
OPERATING PROCEDURES WET CUP LOADING Some models are equipped with a wet cup around the Spool (2) to keep it wetted. This helps prevent curing or crystallization of material on the spool and consequent premature seal failure. Fill the wet cup with a compatible self-leveling material prior to operation if your valve is so equipped.
PERIODIC MAINTENANCE DISPENSE NOZZLE/NEEDLE REPLACEMENT If no material or reduced volumes of material come out of the dispense nozzle/needle it may be partially or completely clogged. Clean with water or solvent depending on the material dispensed. A fine wire, used cautiously, will help open clogged needles. Replace the nozzle or needle if damaged or severely clogged. Replacement nozzles and needles can be ordered by specifying the proper part number.
MODEL 715 GENERAL ILLUSTRATION 1 2 3 4 5 6 7 8 9 10 11 12 8 AIR CYLINDER ASSEMBLY SPOOL MATERIAL INLET ADAPTER NOZZLE (some models) POSIPAK SEAL (2 pieces most models, 4 pieces some models) O-RING SCREW SEAL RETAINER ELBOW ELBOW NEEDLE (some models)
PERIODIC MAINTENANCE DISASSEMBLY - AIR CYLINDER ASSEMBLY Refer to the illustration on the next page and the drawings in the back of this manual for your exact model. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Turn off the air supply and disconnect the air lines. Turn off the material supply and remove the material line from the Material Inlet (3). Remove the valve from its mounting. Remove the Screws (8) and pull the Wet Section away from the Air Cylinder Assembly.
MODEL 715 AIR CYLINDER ASSEMBLY ILLUSTRATION 1 2 3 4 5 6 8 9 11 12 13 14 15 AIR CYLINDER BODY END CAP SNUFF-BACK ADJUSTMENT KNOB PISTON PISTON ROD ELBOW SCREW,#6-32 x 5/16 SCREW,#6-32 x ½ SCREW,#10-24 x 1/2 O-RING O-RING O-RING LOCK WASHER 10
TROUBLESHOOTING If operating difficulties are encountered, review the symptoms below. With each problem there are one or more possible causes that should be investigated to resolve the situation. NOTHING HAPPENS - If absolutely nothing happens when trying to cycle the Dispense Head, check the electric pneumatic power. Check the footswitch or cycle start switch to be sure it is plugged in. VALVE CYCLES, NOTHING DISPENSED - First, try to purge the unit; this should fix most situations.
MODEL 715 RECOMMENDED SPARE PARTS Note: These parts are routine supply items or wear parts not covered by warranty for normal wear.
GENERAL GUIDELINES FOR O-RINGS AND U-CUP SEALS Sizes and materials of construction for O-rings and U-cup seals are selected by Graco based on compatibility with the chemicals to which they will be exposed. Solvents that may remove residual chemicals often have negative effects on the mechanical properties of O-rings and seals. O-Ring Guidelines Always replace an O-ring with the identical one in size, durometer hardness, type and material of construction.
Graco warrants all equipment referenced in this document which is manufactured by Graco and bearing its name to be free from defects in material and workmanship on the date of sale 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.