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best learning will be practice: ask someone to guide you in opening and closing these valves at least once.
closed open
another design. subtle and backwards:
closed open
open is closed, in is out. makes perfect sense.
vent valve
used to vent/purge gas into the chamber
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a type of automatically closing gate valve used in safety systems. closes fast, in the order of a second.
Isolation Valve
a valve on roughing pumps that closes with power loss.
manuali forget what this is
a main vendor: VAT valve