Graco 1206 User Manual

Instructions

332091A

Dispense Valve

Important Safety Instructions

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Dispensit 1206

DISPENSIT® MODEL 1206

DISPENSE VALVE

OPERATING AND MAINTENANCE MANUAL

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

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

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

Description of Operation ................................................................ 4

Setup Procedure ............................................................................. 4

Mounting Dispense Valve ............................................................. 4

Air Controller ................................................................................. 4

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

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

Wet System Checkout .................................................................. 5

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

Periodic Maintenance ..................................................................... 6

Dispensing Needle ........................................................................ 6

Disassembly.................................................................................. 6

Model 1206 General Illustration .................................................... 7

Assembly ...................................................................................... 8

Troubleshooting .............................................................................. 9

Model 1206 Recommended Spare Parts ....................................... 10

Accessories ..................................................................................... 11

General Accessories ..................................................................... 11

Model 1206 Accessories ............................................................... 11

General Guidelines for O-rings and U-cup Seals ......................... 12

Warranty .......................................................................................... 13

GENERAL INFORMATION

The Model 1206 Dispense Valve is engineered for applications which require volumetric consistency. The 1206 allows operation with material supply pressures up to 100 psi (6.9 bar). Material viscosity dispensing capabilities range from very thin material to high-viscosity epoxies and metal filled pastes with viscosities above 1,000,000 cps (1000 Pa•s). The Model 1206 ships complete with the following:

Model 1206 Dispense Valve Two 3-foot (.9m) sections of Pneumatic Air Line Seal Kit Luer Lock Needle Adapter 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) air pressure to the dispense valve. Do not exceed 100 psi (6.9 bar) material inlet pressure to the dispense valve; higher pressures may cause a hazard or serious injury. Note: The recommended pneumatic operating system pressure is 70 psi (4.8 bar) clean/dry air, if your system uses a syringe feed; do not exceed 60psi (4.1 bar) air pressure to the syringe inlet.

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.

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DESCRIPTION OF OPERATION

The 1206 Dispense Valve is a positive displacement valve that requires continuous material feed.

The operation of the valve is as follows:

Material enters the Dispense Valve through the material inlet port located on the metering rod/sleeve

assembly and fills the dispense cavity.

The start device activates the dispense cycle.

To dispense, air is valved to the top fitting and vented from the bottom, lowering the metering rod, blocking

the material inlet and pushing material past the spring-loaded check valve until the stroke adjustment collar stops at the top cylinder block. At that time, the material pressure becomes less and the spring-loaded check valve reseats itself, stopping the material flow.

After the time delay, air is valved to the bottom fitting and vented from the top, allowing the metering rod to

rise; when the rod passes the inlet, material is pushed in to fill the dispense cavity.

The system is again in the normal “ready” state.

SETUP PROCEDURE

MOUNTING DISPENSE VALVE

The1206 dispense valve can be mounted in a variety of ways. Consult the factory for an application review.

AIR CONTROLLER

Operation of the 1206 requires a controller that provides 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 reservoir and valve operation. Air supply to the material reservoir; this connection will vary depending on the type of reservoir. A start device to signal the controller to cycle the valve. Connection for an 1/8 inch (3.175 mm) ID pressure tubing for use between the controller and syringe.

NOTE: If the factory supplied syringe is used, air pressure must be regulated to 60 psi (4.1bar) maximum.

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OPERATING PROCEDURES

DRY SYSTEM CHECKOUT

This is an initial checkout to find if the system setup is complete. Conduct the dry system checkout without material in the system.

Attach the pneumatic pressure lines from the dispense valve to the air supply controller.

Turn on the electric and air supply.

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

Momentarily press the controller’s Dispense Valve cycling control switch. The metering rod should

immediately stroke downward (the time delay must be set to allow a complete downward stroke). After the timer delay the metering rod should retract.

When this happens, the system installation is correct.

WET SYSTEM CHECKOUT

Attach the primed material line from the reservoir to the 1/8” NPTF material inlet port on the side of the

1206 Dispense Valve.

Attach the air line to the regulator and set the air pressure control to the setting required for the application.

Begin with material pressure set at 15 psi (1.0 bar) and gradually increase material pressure until material

feeds through the valve.

Note: When utilizing a remote reservoir, the reservoir, delivery tubing, and fittings must be compatible with the material being dispensed and capable of withstanding the dispensing pressure.

WARNING: Do not apply air pressure to the Dispense Valve or Feed System unless all screws, air connections, and the reservoir are in place and fastened securely. Do not exceed 100 psi (6.9 bar) material inlet pressure. Higher pressures are not required and may cause a serious hazard. If your system uses a syringe feed; do not exceed 60psi (4.1 bar) air pressure to the syringe inlet.

Cycle the dispense valve several times, adjusting the material pressure until the desired shot size is

repeatable.

NOTE: An air bubble in the 1206 could stop thin liquids from dispensing --1) hold your fingertip over the check-valve end for a couple of cycles; 2) if this doesn’t help, point the check-valve end upward and away from people and cycle a couple of times.

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