Graco 332097A Uživatelský manuál stáhnout pdf (Strana 8)

• Frequently the new tube comes cut at an angle so the tip is tapered; the allows you to pull it through

luer lock or other fittings which hold the ends. After the tubing is pulled through, cut of the excess

smoothly and squarely.

• Others may use the material delivery tube - pull this tube farther through luer the pinched portion can

be cut off. When the tube becomes too short it will be necessary to replace it.

5. Gently tighten the upper and lower screw knobs after the new tube and needle are replaced.

6. Return air controllers to normal operating modes.

7. Reinstall the syringe or reservoir and purge the valve.

One package of replacement dispense tubes is supplied with some models. If this dispensing system

is new and there is no similar device in your shop, it may be necessary to contact Dispensit to verify

what replacement material/part number you need; once you know what you need, write down the part

number and description here. Remember not to change the tube's

wall thickness.

VALVE DISASSEMBLY

Reference numbers are provided to help identify each part of the 902-20. Refer to the drawing at the

back of this manual.

Note: In addition to the seal kit, these are the parts most likely to require replacement: dispense tube

(15), needle, and needle block.

1. Turn off the material inlet pressure to the valve.

2. Turn off the air intake pressure to the valve.

3. Remove the air pressure lines into (8 & 8). Do not remove the fittings themselves.

4. Remove the material inlet line.

5. At this point you can conveniently remove the dispense valve from its mounting.

6. Disconnect the needle, needle block, and dispense tube fittings.

7. Remove the faceplate assembly (14); loosen and remove three caphead screws (22) holding it in

place. There will be three standoffs released by those screws.

There is a spring behind the backplate. In the next step, hold the backplate with a thumb by the lower

(pinch-off) piston, while removing the screws.

8. Loosen and remove two caphead screws (20) holding the backplate (16) in place. The backplate,

the bottom piston (9), and its springs (11), will come loose from the rest of the valve. You may need to

push on the dispense piston (4) slightly to help with the removal.

9. Remove the compression spring (5) from the top piston (6).

10. Remove the top piston/pinch off (6) and dispense piston (4).

11. Separate the dispense piston (4) and the top/pinch off (6) piston

12. It is not necessary to separate the base (1) and its spacer rods (2).

13. Separate back plate (16) from bottom piston (9) and two compression springs (11). You may use a

tool to hold the compression springs in place while you move the pack plate.

CLEANING

1. Remove all O-rings and U-seals

2. Use the correct solvent on all parts of the valve until it is clean.

3. Lubricate the cylinder bores, the valve sleeve bores and seals with a very light coating of the

lubricant that comes in the seal kit.

The Valve is now ready for reassembly.

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