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Repair Kits Available By Part Number Section 2 Page - GAMECO

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WARNING: Installation, disassembly, repair and maintenance must<br />

be performed only by qualified personnel.<br />

MAINTENANCE ON THE UPPER BODY OF THE 6579 AND 7579<br />

FILLER VALVES SHOULD BE PERFORMED AFTER ALL GAS IS<br />

EVACUATED FROM THE CONTAINER. EMERGENCY SERVICE<br />

MAY BE CARRIED OUT WITH THE VALVE INSTALLED, BUT ONLY<br />

UNDER THE SAME CONDITIONS REQUIRED FOR RELEASING<br />

LP-GAS (SEE CAUTION).<br />

Installation, usage and maintenance of this product must be in<br />

compliance with all Engineered Controls International, Inc. instructions<br />

as well as requirements and provisions of NFPA #54, NFPA<br />

#58, DOT, ANSI, all applicable federal, state, provincial and local<br />

standards, codes, regulations and laws.<br />

Inspection and maintenance on a periodic basis is essential.<br />

Be sure all instructions are read and understood before installation,<br />

operation and maintenance. These instructions must be<br />

passed along to the end user of the product.<br />

CAUTION: Contact or inhalation of liquid propane, ammonia and<br />

their vapors can cause serious injury or death! NH 3<br />

and LP-Gas<br />

must be released outdoors in air currents that will insure dispersion<br />

to prevent exposure to people and livestock. LP-Gas must be kept<br />

far enough from any open flame or other source of ignition to<br />

prevent fire or explosion! LP-Gas is heavier than air and may not<br />

disperse or evaporate rapidly if released in still air.<br />

Disassembly and <strong>Repair</strong> Procedure<br />

CAUTION: READ THROUGH ALL OF THESE INSTRUCTIONS, IN-<br />

CLUDING THE NOTICE AND WARNINGS ON THE BACK OF THIS<br />

SHEET, BEFORE BEGINNING ANY DISASSEMBLY OR REPAIR.<br />

NOTE: <strong>Repair</strong>s must be performed in a clean area. Hands, clothing,<br />

tools and work area must be completely free of oil, grease and foreign<br />

matter to prevent contamination of component parts and valves.<br />

A. Disassembly<br />

1. Remove cap and save for reassembly.<br />

If the valve is repaired with gas in the container (emergency<br />

service):<br />

2. Depress upper check to assure lower check is functioning properly.<br />

(<strong>Part</strong> number 3119A Unloading Adapter may be used to depress<br />

upper check.) If the lower check does not restrict the flow of gas<br />

from the valve, the upper body and check must not be removed<br />

because an uncontrolled, hazardous amount of gas will discharge<br />

from the valve. If this is the case, the container must be<br />

emptied and a new filler valve installed.<br />

If the valve is to remain on the cylinder, hold the lower body with a<br />

second wrench to keep it from being unscrewed while removing the<br />

upper body.<br />

Continue with disassembly step A4.<br />

7579-80 Assembly for 6579<br />

and 7579 Series Filler Valves<br />

If the valve is repaired with all gas evacuated from the container:<br />

3. Clamp the lower body in a vise with filler opening up.<br />

4. Removing upper body:<br />

a. Current Valves: Use a 7 /8" internal hex wrench that can develop<br />

2000 in/lbs torque. Remove upper body (7579-2A) by turning<br />

counterclockwise. See Figure 1. Save for reassembly.<br />

b. Obsolete Valves: Grip the flat section of the upper body (7579-<br />

2) with a 1 1 /8" open end wrench that can develop at least 2000 in/<br />

lbs torque. Remove by turning upper body counterclockwise.<br />

Save for reassembly. See Figure 2.<br />

5. Remove and discard seat disc and retainer assembly, spring and<br />

gasket, taking care to keep from scratching lower body in gasket<br />

seal area.<br />

6. Inspect lower body and clean if necessary, be sure interior and<br />

gasket seal area are free of dirt, residue and foreign particles.<br />

B. Reassembly<br />

1. Install new gasket (7579-8) in lower body.<br />

2. Place new spring (7579-3) over guide of lower body as shown.<br />

3. Insert new seat disc and retainer assembly (7579-9) into spring.<br />

4. Apply two drops of cement (5555LT271) to threads of upper body<br />

that mate with lower body as shown in Figure 1.<br />

CAUTION: Do not allow cement to contact seat disc.<br />

5. Press seat disc retainer into guide until female threads of lower body<br />

are exposed. Hold in position with the eraser end of a pencil.<br />

Replace upper body over pencil and thread into lower body, tighten<br />

to 1500-1800 in/lbs torque, using a suitable 7 /8" internal hex wrench.<br />

CAUTION: Unless seat disc retainer is held in guide during assembly,<br />

internal parts of valve may be damaged and threads of upper<br />

body and lower body will not engage properly.<br />

6. Depress and release seat disc and retainer assembly a few times,<br />

if freedom of movement or proper seating is not possible, disassemble<br />

and repeat steps B2 through B5.<br />

7. Install new gasket (2697-20) in upper body.<br />

8. Reinstall valve and or pressurize container. Check for proper<br />

operation and check all seal points for leaks by applying a leak<br />

detection solution.<br />

9. Replace cap.<br />

Figure 1 – Current 7579<br />

Figure 2 – Obsolete 7579<br />

** 5555LT271 Cement<br />

(apply to male threads at these points)<br />

3174-9P Cap<br />

* 2697-20 Gasket<br />

7579-2A Upper Body<br />

* 7579-8 Gasket<br />

* 7579-9 Seat Disc & Retainer Assembly<br />

7579-2 Upper Body<br />

1 1 /8" Wrenching Flats<br />

* These items form the 7579-80 Assembly,<br />

recommended for most repairs.<br />

** Must be ordered separately from Engineered<br />

Controls International, Inc.

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