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Plug valves are valves with cylindrical or conically-tapered "plugs" which can be rotated inside the valve body to control flow through the valve. The plugs in plug valves have one or more hollow pass

The invention provides a vacuum gate valve for closing off an opening. The vacuum gate valve can have a valve plate that can be turned so that the alignment of the valve plate will adapt to a valve se

An object is to provide a gate valve capable of preventing operational deficiencies caused by particulate materials accumulating in a valve box, thus providing superior sealing properties and high dur

A gate valve has a transfer chamber-side valve element and a process chamber-side valve element connected to a single shaft actuated with a single three-position air cylinder to selectively close a pr

A gate valve for use with a catheter including an elongated valve body having a transversely extending slide chamber and a slide member slidably supported in the slide chamber for transverse sliding m

Gate valves have been well known and used for a number of years employing a variety of constructions. Such valves normally include a valve body with a flow passage therethrough, spaced annular seating

A patent document 1 (U.S. Pat. No. 6,390,448) discloses a gate valve wherein mutually opposing walls of the gate valve body are formed with a PC (process chamber) opening and a TC (transfer chamber) o