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

A packingless gate valve is disclosed which includes a housing having opposed similar housing halves with resilient sleeve units which compressibly engage each other in the valve open condition and en

A method of forming a coated gate for a gate valve, the gate incorporating a coupling member which is located with a clearance fit in an undercut groove in the gate and which is formed with a screw-th

A packingless gate valve is disclosed which includes a housing having opposed similar housing halves with resilient sleeve units which compressibly engage each other in the valve open condition and en

Gate valves of various types have been in use for many years. In general, gate valves are so called "hard seal" valves in which the gate valve is sealed in a metal to metal or hard seal. Such hard sea