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A multi-line back pressure control system for providing two way hydraulic line movement while maintaining back pressure control. Check valves are integrated in hydraulic fluid control lines extending downhole into a wellbore. Each check valve is pilot operated with pressure from another hydraulic li

A multi-line back pressure control system for providing two way hydraulic line movement while maintaining back pressure control. Check valves are integrated in hydraulic fluid control lines extending downhole into a wellbore. Each check valve is pilot operated with pressure from another hydraulic line to selectively open the lines for two way fluid communication. Removal of the pilot pressure closes the check valves to provide passive back pressure control against catastrophic wellbore events. Pilot pressure operation between multiple pressurized lines can be provided with valves such as three-way, three-position piloted valves.

대표청구항 ▼

A multi-line back pressure control system for providing two way hydraulic line movement while maintaining back pressure control. Check valves are integrated in hydraulic fluid control lines extending downhole into a wellbore. Each check valve is pilot operated with pressure from another hydraulic li

A multi-line back pressure control system for providing two way hydraulic line movement while maintaining back pressure control. Check valves are integrated in hydraulic fluid control lines extending downhole into a wellbore. Each check valve is pilot operated with pressure from another hydraulic line to selectively open the lines for two way fluid communication. Removal of the pilot pressure closes the check valves to provide passive back pressure control against catastrophic wellbore events. Pilot pressure operation between multiple pressurized lines can be provided with valves such as three-way, three-position piloted valves. t; the lever is attached to the first bearing housing element; the second bearing housing element located on a side on which a drive mechanism for the pressure roll is provided comprises a plurality of rolling bearings for supporting an end shaft of the pressure roll, a gear provided axially outward of the rolling bearings and having a hollow shaft in which an outer end of the end shaft is fitted so that the hollow shaft and the outer end of the end shaft are rotatable as a single unit, and a plurality of rolling bearings for supporting the hollow shaft, the second bearing housing element being capable of being fixed in the C-shaped opening of the first bearing housing element; and the second bearing housing element on a side thereof opposite to the side on which the drive mechanism is provided comprises a plurality of rolling bearings for supporting an end shaft of the pressure roll, and is capable of being fixed in the C-shaped opening of the first bearing housing element. 9. The laminator according to claim 4, wherein a holding member engageable with the bar is provided in the lever or the bearing housing separately from the roller provided on the other end of the lever, so as to maintain a position of the bearing housing when the pressure roll is removed from the bearing housing. 10. The laminator according to claim 1, wherein: the shaft for supporting the bearings is provided for each of the bearing housings; each of the shafts has an outer end thereof supported on the side plate through a rolling bearing; each of the shafts ha