초록 ▼

Disclosed is a mud saver valve which includes a tubular body connectable between a kelly and a drill string. An annular seat ring having a central opening is mounted within the body. A piston is axially movably mounted within the body for engagement with the seat ring. The piston includes a bore sub

Disclosed is a mud saver valve which includes a tubular body connectable between a kelly and a drill string. An annular seat ring having a central opening is mounted within the body. A piston is axially movably mounted within the body for engagement with the seat ring. The piston includes a bore substantially coaxially aligned with the central opening and a flange that extends radially outwardly from the piston to slidingly engage the interior of the body. The piston has a plurality of ports above the piston to communicate the exterior of the piston with the bore. A plug is removably mounted in the piston. The plug includes a shear ring removably inserted in the bore and a spear axially movably mounted in the shear ring. The plug is movable between a first position wherein the spear sealingly engages the shear ring in a second position that allows fluid to flow upwardly between the spear and the shear ring. A spring is provided to urge the piston into engagement with the seat ring.

대표청구항 ▼

A mud saver valve, which comprises: a tubular body connectable between the kelly and the drill string: an annular seat ring mounted within said body, said seat ring having a central opening; a piston axially movably disposed within said body for engagement with said seat ring, said piston having a b

A mud saver valve, which comprises: a tubular body connectable between the kelly and the drill string: an annular seat ring mounted within said body, said seat ring having a central opening; a piston axially movably disposed within said body for engagement with said seat ring, said piston having a bore substantially coaxially aligned with said central opening and a flange extending radially outwardly from said piston to slidingly engage the interior of said body, said piston having a port above said flange communicating the exterior of said piston with said bore; a plug removably mounted in said piston above said port to normally close said bore, said plug including a shear ring removably inserted in said bore with a shear pin shearingly connecting said shear ring with said piston, and a spear axially movably mounted in said shear ring for movement between a first position wherein said spear sealingly engages said shear ring and a second position to allow fluid to flow upwardly between said spear and said shear ring; and means for urging said piston into engagement with said seat ring.