rubber O-ring seals VS all metal seals (see seals page)
O-ring: relatively cheap, easily replaceable, gas permeable, hydrocarbon outgassing
Metal: expensive, challenging to replace/repair, tightest seal, clean
gate valve
angle valve
(AKA corner valve AKA right angle valve)
vent valve
a type of ball valve, used to vent gas into the chamber
leak valve
an unusual valve, only found in very specific applications, used to vent gas into chambers at a very precise and slow rate
Fast Valve
Isolation Valve
pressure release valve
for pressurized gas
a main vendor: VAT valve