Graco 715 User Manual

Instructions

Important Safety Instructions

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Dispense Valve

100psi (0.69 MPa, 6.9 bar) Maximum Working Pressure

See Page 3 for model information, including maximum working pressure and approvals.

332095A EN



Dispensit

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

715

DISPENSIT® MODEL 715

DISPENSE VALVE

OPERATING & MAINTENANCE MANUAL

General Information................................................................................... 3

Safety Information ..................................................................................... 3

Illustration References .............................................................................. 3

General Accessories ................................................................................. 3

Description Of Operation .......................................................................... 4

Setup Procedure ........................................................................................ 5

Mounting Dispense Valve ......................................................................... 5

Air Controller ............................................................................................. 5

Operating Procedures ............................................................................... 5

Dry System Checkout .............................................................................. 5

Material Loading ...................................................................................... 5

Wet Cup Loading ..................................................................................... 6

Wet System Checkout ............................................................................. 6

Operation Adjustments ............................................................................ 6

Air Supply Adjustment ........................................................................ 6

Material Output and Snuff-Back Adjustment ....................................... 6

Dispense Needle Height Adjustment .................................................. 6

Periodic Maintenance ................................................................................ 7

Dispense Nozzle/Needle Replacement ................................................... 7

Disassembly – Wet Section ..................................................................... 7

Assembly – Wet Section .......................................................................... 7

Model 715 General Illustration ................................................................. 8

Disassembly – Air Cylinder Assembly ..................................................... 9

Assembly – Air Cylinder Assembly .......................................................... 9

Model 715 Air Cylinder Assembly Illustration ........................................... 10

Troubleshooting ........................................................................................ 11

Model 715 Recommended Spare Parts .................................................... 12

General Guidelines for O-rings and U-cup Seals .................................... 13

Warranty ..................................................................................................... 14

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 (.9 m) sections of pneumatic air line  Seal Kit  Operating and Maintenance Manual

SAFETY INFORMATION

This product should be used only by employees who have been given appropriate training and safety warnings as set forth in this manual. Read completely before operating.

WARNING: Do not exceed 100 psi (6.9 bar) pressure on the operating system. Do not exceed 2000 psi (137.9 bar) material inlet pressure. Higher pressures may cause a hazard or serious injury. Note: The minimum recommended pneumatic operating system pressure is 70 psi (4.8 bar) clean/dry air.

Toxicity and flammability hazards depend upon the product being dispensed by this unit, and the user should take appropriate safety precautions as indicated on the MSDS of the product.

Always wear safety glasses.

ILLUSTRATION REFERENCES

Throughout this manual you will find references by illustration item number to the illustrations in the manual. The references are indicated by parentheses around a number such as: (7). Illustrations represent typical valve configurations. The drawings for your exact model are inserted at the back of the manual and include the part numbers for ordering replacement parts.

GENERAL ACCESSORIES

GracoOhio offers a full line of standard and custom accessories for your dispensing needs including:

 Valve Controllers  Syringe Feed Systems  Cartridge Retainers and Pressure Reservoirs  Titan 200 High Pressure Cartridge Feed Systems  Transfer Pump Feed Systems for 1, 5 and 55 gallon containers  Mounting Bases and Brackets  Custom Needles and Needle Blocks

Consult your Dispensit dealer or the factory for details.

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. Material flows through the Material Inlet (3), around the narrow section of the Spool (2) and out through the Nozzle (5) (or Needle (12). Volume can be varied by changing the material pressure, nozzle size, dispense speed and dispense time.

4. When the correct amount of material has been dispensed, the controller relieves air from the Open port and applies air to the Close port. The Spool (2)

retracts into the lower Posipak Seal (6) “snuffing” the

material back into the Nozzle (5), sealing the valve and ending the dispensing process. The system is again in the normal “ready” state.

SETUP PROCEDURE

If there are any problems in getting started, refer to the Troubleshooting

section or call Technical Service at (330) 494-1313.

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:

 A minimum of 0.5 SCFM (2.3 cm3) 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.  Independent air pressure regulators for material supply and valve operation.  “Purge capability” which is the ability for the operator to pass or not pass air to the valve’s Open port.  For semiautomatic or automatic applications, a foot switch or other control to cycle the valve.  Connection for .16”ID x .25” OD (6.35mm) pressure tubing for use between the dispense valve and controller.  Connection for .16”ID x .25” OD (6.35mm) pressure tubing for use between the controller and material supply

air inlet.

OPERATING PROCEDURES

DRY SYSTEM CHECKOUT

This is an initial checkout to determine if the setup has been properly completed. The dry checkout is conducted without any material in the system. Refer to the illustrations above or below.

1. Turn on the controller and the air supply.

2. Set the air pressure to 70 psi (4.8 bar) on the system pressure gauge.

3. In the normal “ready” state the Spool (2) is seated in the Posipak Seal (6), sealing the dispense valve. For this test, remove the Nozzle (5) so that you can visually verify that the Spool (2) extends upon actuation.

4. Momentarily press the dispense valve cycling control switch.

5. The controller applies air to the Open port of the dispense valve, the Spool (2) extends. After the time delay the controller applies air to the Close port causing the Spool (2) to retract. Visually verify the spool movement. When this happens, the system is correctly installed.

MATERIAL LOADING

Material is supplied from a pressure vessel or pump with enough pressure to cause a proper rate of flow from the dispense nozzle. (Note: The material pressure will vary depending on the application.)

Warning: Do not apply either operating or material supply pressure to the product until all screws, material supply connections and air system connections are in place and properly tightened.

Attach the air line to the regulator and set the air pressure control to the setting required for the application. (Note: When using a remote reservoir, the delivery tubing and fittings must be compatible with the material being dispensed and capable of withstanding the dispensing pressure.)

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