Safety Valve (Sv-Figs. 1.4, 1.6 And 1.8) 1); Testing On Le/Lf/Lt; Testing On Le/Lf/Lt Trolley; Relief Valve (8-Fig. 1.1) On Lf7, -10, Le10 Up To -20 And Lt - Atlas Copco LE2 Instruction Book

Instruction book

5.7 Safety valve (SV-Figs. 1.4, 1.6 and 1.8) 1)

Replace the valve if it does not open at the correct pressure. No adjustments are allowed.
Testing
Testing as described below shall only be carried out by competent personnel.

5.7.1 Testing on LE/LF/LT

1. Close the air outlet valve, depressurize and disconnect the hose or pipe from the valve.
2. Start the compressor and run it until it stops automatically.
3. Switch off the voltage.
Remove the cover from the air pressure switch and, with the air receiver now under pressure, turn the
adjusting screw one turn clockwise to increase the stopping pressure (see also sections 5.4/5.5).
Reinstall the cover.
4. Switch on the voltage, slightly open the outlet valve and start the compressor.
5. Gradually close the outlet valve while checking the air pressure gauge. If the safety valve has not
opened at the pressure specified in section 7, it must be replaced by a new one. If the compressor
unloads before the specified opening pressure is reached, repeat the procedure as mentioned from
step 3.
6. Readjust the unloading pressure as described in sections 5.4 and 5.5.
7. Reconnect the hose or pipe to the closed air outlet valve.

5.7.2 Testing on LE/LF/LT Trolley

1. Close the air outlet valves, depressurize and disconnect the hoses from the valves.
2. Loosen the red handle of the pilot valve (1-Fig. 5.9) and the two nuts (3).
3. Open outlet valve (AV1-Fig. 1.16) a fraction. Start the compressor.
4. Gradually turn adjusting screw (2-Fig. 5.9) clockwise while checking pressure gauge (Gp-Fig. 1.16).
If the safety valve has not opened at the pressure specified in section 7, it must be replaced by a new
one.
5. Readjust the normal working pressure after testing. Consult section 5.6.
6. Fit nuts (3-Fig. 5.9) and handle (1) in their original positions.

5.8 Relief valve (8-Fig. 1.1) on LF7, -10, LE10 up to -20 and LT

The relief valve protects the LP side of the compressor. No adjustments are allowed.
Testing
Testing as described below shall only be carried out by competent personnel.
Remove the relief valve and fit a 3/8 inch B.S.P. plug instead. Remove the safety valve from the air
receiver and replace it by the relief valve. The latter can then be tested at increasing air receiver pressure
after the compressor has been started with open air outlet valve. If the valve has not opened at the
pressure specified in section 7, it must be replaced by a new one. Reinstall the valves in their respective
places after testing.
Footnote chapter 5
1) Not on Compressor Block/Power Pack
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