초록 ▼

A hydraulic system and method are provided for supplying high pressure hydraulic fluid to a cylinder for operating a ram, e.g. a shearing and/or shut-off ram for a blowout preventer. It comprises means for supplying high pressure hydraulic fluid to the cylinder, said hydraulic fluid supply means com

A hydraulic system and method are provided for supplying high pressure hydraulic fluid to a cylinder for operating a ram, e.g. a shearing and/or shut-off ram for a blowout preventer. It comprises means for supplying high pressure hydraulic fluid to the cylinder, said hydraulic fluid supply means comprising first and second storage means for storing hydraulic fluid under pressure, first conduit means for supplying hydraulic fluid under pressure from said first storage means to the cylinder, a pressure sensing device for determining the back pressure in said first conduit means, second conduit means for supplying hydraulic fluid under pressure from said second storage means to the cylinder and valve means for automatically opening said second conduit means when the back pressure in the first conduit means reaches a predetermined amount.

대표청구항 ▼

A hydraulic system for supplying high pressure hydraulic fluid to a cylinder for operating a shearing and/or shut-off ram for a blowout preventer, comprising means for supplying high pressure hydraulic fluid to the cylinder, said hydraulic fluid supply means comprising first and second storage means

A hydraulic system for supplying high pressure hydraulic fluid to a cylinder for operating a shearing and/or shut-off ram for a blowout preventer, comprising means for supplying high pressure hydraulic fluid to the cylinder, said hydraulic fluid supply means comprising first and second storage means for storing hydraulic fluid under pressure, first conduit means for supplying hydraulic fluid under pressure from said first storage means to the cylinder, a pressure sensing device for determining the back pressure in said first conduit means, second conduit means for supplying hydraulic fluid under pressure from said second storage means to the cylinder and valve means for automatically opening said second conduit means when the back pressure in the first conduit means reaches a predetermined amount. A method for supplying high pressure hydraulic fluid to a cylinder for operating a shearing and/or shut-off ram for a blowout preventer, which comprises supplying the fluid from first and second high pressure hydraulic storage means by way of first and second conduit means, and including the steps of initially supplying fluid to the cylinder from the first storage means via the first conduit means until a back pressure develops in said first conduit means, sensing the back pressure by means of a pressure sensing device, generating a signal when the back pressure reaches or exceeds a predetermined value, said signal causing a valve to automatically open in the second conduit thereby providing a high pressure flow of fluid from the second storage means to the cylinder.