Abstract: A flow restrictor device for production tubing comprising an obstructing member. The flow restrictor is arranged for movement between a first position where the obstructing member is located so as to form a seal with an edge of an aperture formed in a wall of said production tubing and is arranged to prevent fluid flow through said aperture, and a second position where the obstructing member is located so that the aperture is unobstructed. The flow restrictor further comprises a retaining arrangement for restricting possible locations of said obstructing member to said first position, second position and positions therebetween. The aperture allows fluid communication between the exterior and interior of the production tubing.

Abstract: A flow restrictor device (10) for production tubing comprises: an obstructing member (18) arranged for movement between a first position where said obstructing member is located so as to form a seal with an edge of an aperture (14) formed in a wall of said production tubing and is arranged prevent fluid flow through said aperture, and a second position where said obstructing member is located so that the aperture is unobstructed; and a retaining arrangement (16) for restricting possible locations of said obstructing member to said first position, second position and positions therebetween.