I'm trying to find information on a gate valve I've used in the past.  What I remember of the valve is that it had either a coarser thread, or double thread that allowed the stem/gate to close or open twice as a fast as a normal threaded valve.  Does anyone know the type of valve I'm talking about?  Sites to visit that sell these type of valves for industrial use 6" to 18"???  I've tried searching the web for this type and haven't come back with anything.
FYI, There are Gate Valves with four leads which close even faster and "Quick Opening" Gate Valves (Harder to find) which open in one stroke.

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