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TN 9-4120-389-14
NOTE
The most logical cause of failure to service valve will be due to loose or damaged valve stem.
b. Repair. If leak is indicated, proceed as follows:
(1) Tighten valve stem.
(2) Leak check per para. 5-6.
(3) If leak persists, discharge the system per para. 5-3.
(4) Remove valve stem.
(5) Install replacement stem.
(6) Leak check the valve stem/body area per para. 5-6.
(7) If leak persists, replace valve.
c. Removal.
(1) Discharge the refrigeration system per para. 5-3.
(2) Purge the system with nitrogen (See para. 5-4).
(3) Debraze the valve (See para. 5-5).
(4) Remove valve from tube connection.
d. Installation.
(1) Remove valve stem from replacement valve.
(2) Place replacement valve on tube connection.
(3) Braze valve to tube connection (See para. 5-5).
(4) Install stem in valve body. Install cap.
(5) Replace dehydrator (See para. 5-10).
(6) Leak test newly connected joints and the repair area. (See para. 5-6).
(7) Evacuate the system (See para. 5-7).
(8) Charge the system (See para. 5-8).
Follow-on procedure: Install top cover (See para. 4-14).
5-29
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