Bellows valve

Abstract

The present invention relates to a valve device comprising an external structure with a longitudinal axis and a valve seat, and a valve body mounted movably inside the external structure. The valve device comprises a first bellows device permitted to be moved in a substantially radial direction, in fluid connection with a first fluid, and hydraulically connected to a second bellows device permitted to be moved in a substantially axial direction. The second bellows device is connected to a first part piston cooperating with a second part piston, thereby giving the second part piston an oppositely directed movement relative to the first part piston, which thereby moves the valve body relative to the valve seat. The invention also relates to a method for operation of a valve device and the use thereof.

1 . A valve device comprising an external structure with a longitudinal axis and a valve seat, and a valve body mounted movably inside the external structure,
 further comprising a first bellows device permitted to be moved in a substantially radial direction, in fluid connection with a first fluid, and hydraulically connected to a second bellows device permitted to be moved in a substantially axial direction, which second bellows device ( 16 ) is connected to a first part piston cooperating with a second part piston, thereby giving the second part piston an oppositely directed movement relative to the first part piston, which thereby moves the valve body relative to the valve seat.   
   
   
       2 . A valve device according to  claim 1 ,
 wherein the first bellows device is mounted between two stop devices which restrict the radial movement.   
   
   
       3 . A valve device according to  claim 2 ,
 wherein the first bellows device at least partly encloses an internal stop device.   
   
   
       4 . A valve device according to  claim 3 ,
 wherein a bellows element in the first bellows device is supported at its axial ends in such a manner that a first cavity is formed between the bellows element and internal stopper element separated from a first fluid on the other side of the bellows element.   
   
   
       5 . A valve device according to  claim 4 ,
 wherein the first cavity is in fluid connection with the second bellows device.   
   
   
       6 . A valve device according to  claim 1 ,
 wherein the first part piston is mounted in connection with a prestressing device.   
   
   
       7 . A valve device according to  claim 6 ,
 wherein the prestressing device comprises devices for adjusting the prestressing against the first part piston.   
   
   
       8 . A valve device according to  claim 7 ,
 wherein it comprises access to the devices for adjusting prestressing from the outside of the external structure.   
   
   
       9 . A valve device according to  claim 1 ,
 wherein the first part piston is connected to the second part piston by a hinge device.   
   
   
       10 . A valve device according to  claim 1 ,
 wherein an inlet to the valve seat is arranged on a side of at least one area of the external structure adapted for sealing against a second encircling element and an outlet is arranged on the opposite side of the same area.   
   
   
       11 . A valve device according to  claim 1 ,
 wherein the external structure further comprises at least one second area adapted for sealing against a second encircling element mounted between the inlet and the fluid connection for the first fluid.   
   
   
       12 . A valve device according to  claim 11 ,
 wherein the inlet of the valve device is connected to a second fluid, and the outlet of the valve device and the fluid inlet are connected to a first fluid, where the valve is in an open position with a small pressure difference between the first and the second fluid and is in a closed position with a large pressure difference between the first and the second fluid.   
   
   
       13 . A valve device according to  claim 1 ,
 wherein the hydraulic connection between the first and second bellow devices comprises a hydraulic fluid connection comprising a delay device.   
   
   
       14 . A valve device according to  claim 13 ,
 wherein the delay device in the hydraulic fluid connection comprises at least one plate, in which plate one or more through-going holes are provided.   
   
   
       15 . A method for operation of a valve, comprising an external structure with a longitudinal axis and a valve seat and a valve body, wherein a first external fluid ( 8 ) influences a first bellows device, which upon a movement in the radial direction displaces a hydraulic fluid relative to a second bellows device which is thereby moved in the axial direction, where the second bellows device is influenced by a second fluid, where the second bellows device influences a first part piston to move in a direction, which part piston cooperates with a second part piston, giving the second part piston a movement in the opposite direction in order thereby to operate the valve body relative to the valve seat. 
   
   
       16 . A method for displacing fluid in the annulus in a well according to  claim 13 ,
 wherein, when there is fluid both in the production tubing and the annulus, the valve device is in an open position and the inlet and the second bellows device of the valve device are in contact with the annulus and the outlet and the first bellows device are in contact with the tubing, whereupon gas is injected into the annulus thereby increasing the pressure in the annulus and causing fluid and gas to be displaced through the valve until the pressure of the fluid at the inlet relative to the fluid inlet pressure on the first bellows device and the prestressing device across the valve is reduced, causing the valve to be closed.   
   
   
       17 . (canceled) 
   
   
       18 . (canceled)