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A valve device adapted for insertion at one or more specified locations in a pipe system. The device is adjustable into three positions: in the open position affording normal operation of the pipe system; in a first closed position affording connection of external pressure fluid to the system at one

A valve device adapted for insertion at one or more specified locations in a pipe system. The device is adjustable into three positions: in the open position affording normal operation of the pipe system; in a first closed position affording connection of external pressure fluid to the system at one side of the location; and a second closed position affording connection of external pressure fluid to the system at the other side of the location. The device is in the nature of a ball valve with a spherical valve element having means for connecting pressure fluid through the valve housing into the system when the valve is in either of the first and second closed positions.

대표청구항 ▼

A device for selectively applying pressure from a source of pressure fluid to different sections of a piping system providing a conduit for fluid flow, comprising: a valve housing having a through bore and means to couple said housing into said piping system at a selected location between said secti

A device for selectively applying pressure from a source of pressure fluid to different sections of a piping system providing a conduit for fluid flow, comprising: a valve housing having a through bore and means to couple said housing into said piping system at a selected location between said sections so as to connect the opposite ends of said through bore respectively with the conduits of said different piping system sections, a pressure fluid chamber separated from said bore, and means to connect said source of pressure fluid to said chamber; a valve element mounted in said housing for selective movement, said valve element having a first though passage and a second pressure-fluid passage; means to selectively position said valve element in three positions: an open position, a first closed position and a second closed position; in the open position of said valve element, said first passage being in registry with said through-bore, and said second passage isolating said pressure chamber from either of said opposite ends of said through bore; in the first closed position of said valve element, said first passage being out of registry with said through-bore, and said second passage connecting said chamber with one of said opposite ends of said through-bore to thereby connect said one end of the through-bore with said source of pressure fluid; and in the second closed position of said valve element, said first passage being out of registry with said through bore, and said second passage connecting said chamber with the other of said opposite ends of said through-bore to thereby connect said other end of the through-bore with said source of pressure fluid.