Graco Inc 238338 manual Maintenance, Service, Clean Dispensing Valve and System Daily, Repair Kit

Maintenance

Clean Dispensing Valve and System Daily

CAUTION

Be sure that the solvent you use is compatible with the fluid being dispensed, to avoid clogging the valve’s fluid passages.

An important part of the care and maintenance of your automatic dispensing valve is proper flushing. Flush the valve daily with a compatible solvent until all traces of fluid are removed from the valve passages. Follow the Pressure Relief Procedure on page 5 before flushing.

Clean the outside surfaces of the valve by wiping with a soft cloth dampened with a compatible solvent.

CAUTION

Never immerse the entire dispensing valve in solvent. Immersing in solvent removes lubricants and tends to damage packings.

To remove a hardened particle from the orifice, blow air through the orifice from the front.

Service

Needle, Seat and Packings

To clean or replace the needle (18), its seat (17) or packings (19 or 15), proceed as follows:

1.Follow Pressure Relief Procedure on page 5

2.Remove retaining nut (3).

3.Remove valve housing (4).

4.Remove valve seat (2) and o-ring (19) from valve housing (4). Remove o-ring.

5.Remove gun needle (18).

6.Remove seal nut (21).

7.Remove o-ring (15).

8.Clean all parts.

9.Lubricate o-ring (15) with one drop of oil. Install o-ring.

10.Install seal nut (21).

11.Install gun needle (18).

12.Install o-ring (19) on valve seat (2) and insert into valve housing (4).

13.Install retaining nut (3).

Air Piston, Spring and Seals

Follow the Pressure Relief Procedure on page 5, then remove the valve as explained, preceding. Re- move the air cylinder cap (7), take out the spring (8) and pull the piston (10) out. Clean and inspect all parts. Check the piston o-rings (11, 12) carefully. Lubricate all parts with a light waterproof grease and reassemble the valve using new parts as necessary.

Repair Kit

Repair Kit 238340 includes the parts listed with an * in Parts on page 11.

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