초록 ▼

There is disclosed a ram type blowout preventer having a pair of shear rams adapted to shear pipes suspended in the bore of the preventer and subsequently seal off the bore. The rams utilize a transverse packing for sealing between the shear blades when they are closed. One shear ram has a ramp adap

There is disclosed a ram type blowout preventer having a pair of shear rams adapted to shear pipes suspended in the bore of the preventer and subsequently seal off the bore. The rams utilize a transverse packing for sealing between the shear blades when they are closed. One shear ram has a ramp adapted to engage a shoulder on the opposing ram so as to urge the shearing blades closer together as they are closing and thereby reduce the vertical gap which the transverse seal must bridge.

대표청구항 ▼

A blowout preventer comprising a housing having a bore therethrough, ram guideways extending outwardly from said bore, rams mounted for reciprocation in said guideways and having shearing means on their inner faces, means for moving said rams together to close off said bore and apart to open said bo

A blowout preventer comprising a housing having a bore therethrough, ram guideways extending outwardly from said bore, rams mounted for reciprocation in said guideways and having shearing means on their inner faces, means for moving said rams together to close off said bore and apart to open said bore, means for sealing between said shearing means, a shoulder on one of said rams, and ramp means on the other of said rams adapted to engage said shoulder as said shearing means is moved to closed position whereby said shearing means are urged toward each other to minimize the gap to be sealed by said sealing means.