초록 ▼

A valve for use in controlling flow in a subterranean well and using an expandable and contractable fluid sealing bellows is disclosed. The valve has a valve closure member such as a ball valve head acutated by an increase in control fluid pressure. Control pressure causes the bellows to expand or c

A valve for use in controlling flow in a subterranean well and using an expandable and contractable fluid sealing bellows is disclosed. The valve has a valve closure member such as a ball valve head acutated by an increase in control fluid pressure. Control pressure causes the bellows to expand or contract and a control rod engaging the bellows can be shifted. The control rod is part of an actuating mechanism for shifting the valve closure member between open and closed positions. The bellows can support the difference between control pressure and well pressure which are respectively present on the exterior and interior of each bellows element.

대표청구항 ▼

A valve for use in controlling the flow through a fluid transmission conduit in a subterranean oil or gas well in response to changes in a control pressure, comprising: a valve housing having a bore communicating with the fluid transmission conduit; a shiftable valve closure member for opening and c

A valve for use in controlling the flow through a fluid transmission conduit in a subterranean oil or gas well in response to changes in a control pressure, comprising: a valve housing having a bore communicating with the fluid transmission conduit; a shiftable valve closure member for opening and closing the valve bore; actuating means for shifting the valve closure member between open and closed positions in response to differential changes in a supplied control fluid pressure and the well fluid pressure below said valve closure member comprising an expandable and contractable bellows exposed to said control pressure on one surface, said bellows supporting said pressure differential thereacross; and means for supplying said control pressure to said bellows to shift said actuating means in response to differential pressure changes acting on said bellows.