FIRE EXTINGUISHER STOP CHECK VALVE REPLACEMENT
a. Wipe removed and attaching parts with a clean rag.
b. Clean fire extinguisher stop check valves.
(1) Submerse the two way check valve in acetone long enough to remove any old corrosion preventive
compound. If required, use a soft brush to remove any corrosion preventive compound.
(2) Agitate valve while still submerged in fluid to help remove corrosion or residue of evaporation.
(3) If required use a soft brush to help remove corrosion or evidence of evaporation. Use brush (item 36,
(4) Flush valve with clean water.
Use of compressed air to expidite drying time is permitted.
(5) Allow to air dry for 20 minutes.
(6) Inspect (QA).
(7) Apply corrosion preventive compound. Use corrosion preventive compound (item 63A, App F).
(a) Cap one end of the valve and fill with corrosion preventive compound. Use corrosion preventive
compound (item 63A, App F).
(b) Rotate valve to insure interior surfaces are coated.
(c) Cap other ports and rotate to insure all interior surfaces are coated.
(d) Remove caps and drain excess corrosion preventive compound.
(e) Allow to air dry for a minimum of 20 minutes.
(8) Wipe exterior with a clean cloth. Use cloth (item 52, App F).
a. Check valve and nuts for stripped or damaged threads (para 12.33).
b. Check removed and attaching parts for corrosion (para 1.49).
GO TO NEXT PAGE