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SCHRADER VALVES
Refrigerant leaks may occur at the valve core of Schrader
valves. These leaks may not be apparent due to the cover and/
or any thread sealant used. NESLAB recommends leak check-
ing all Schrader valves, especially any that have been ac-
cessed during service.
If the system is emptied of refrigerant, NESLAB recommends
replacing the valve cores with new ones as a preventive mea-
sure.
If a leak is suspected but cannot be confirmed with an elec-
tronic leak detector, NESLAB recommends using a party bal-
loon to trap any escaping refrigerant. This will provide a visual
confirmation of a leak.
BALLOON TEST
1. Remove valve cover, if installed.
2. Stretch a balloon over the Schrader valve threads.
3. A leak will inflate the balloon. Leave the balloon in place
overnight if convenient.
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