A frictionless rotary valve comprising: a valve body to be connected within a gas meter, the valve body comprising: a seal, fixedly attached near an outlet of the valve body; and a valve disc, having a ball bearing attached to the valve body; and a gear mechanism comprising: a worm wheel engaged with a worm, wherein the worm wheel is attached to a second end of the valve disc; a drive gear connected to the worm, wherein a rotation of the drive gear in a clockwise direction rotates the worm wheel in an anti-clockwise and moves the valve disc in a closed position; a worm wheel stop, for restricting a movement of the worm wheel in the anti-clockwise direction and driving the worm wheel in a vertically upward direction; and a linear guide attached to the worm wheel.

The main purpose of the invention is a metal sealing system (6) for a triple eccentricity butterfly valve (30) comprising: a dynamic metal seal (21), comprising a metal core surrounded by an external coating; a metal case (15) with an external surface that has an inclined conical shape, comprising a first housing inside which the dynamic metal seal (21) is mounted; a metal cover (29) fixed to the metal case (15) to allow it to close by flush fitting of the upper or lower faces of the metal cover (29) and the metal case (15), the metal case comprising a second housing into which the metal cover fits, the dynamic metal seal (21) being located between the metal cover (29) and the surface of the metal case (15) defining the first housing.

Valve comprising a body (2), a centred butterfly (1), mounted with the ability to rotate inside the body (2) from an open position revealing the passage to a closed position covering said passage, and a seal (3) arranged inside a housing which is delimited by the seat and by a face, opposite the seat in the closed position, of the butterfly, the seat and the face converging towards the inside in the axial direction. The seal (3) moves freely in the housing.

A liquid sampler for use in sampling the liquid in a well. The sampler has a tube for containing the sample and an inlet at the bottom and an outlet at the top. An inlet check valve is located at the inlet which has a door configured autonomously to move between open and closed configurations in response to fluid flow through the inlet. In the open configuration, the door is aligned with the axis of the tube to allow fluid to flow into the tube through the inlet from below, and in the closed configuration, the door is positioned transverse to the axis of the tube to block fluid flow from the tube out through the inlet thereby retaining fluid within the tube as the sampler is raised up.

A liquid sampler for use in sampling the liquid in a well. The sampler has a tube for containing the sample and an inlet at the bottom and an outlet at the top. An inlet check valve is located at the inlet which has a door configured autonomously to move between open and closed configurations in response to fluid flow through the inlet. In the open configuration, the door is aligned with the axis of the tube to allow fluid to flow into the tube through the inlet from below, and in the closed configuration, the door is positioned transverse to the axis of the tube to block fluid flow from the tube out through the inlet thereby retaining fluid within the tube as the sampler is raised up.

A butterfly valve comprising a valve body and a rotatable obturator (3), the rotatable obturator mounted in the valve body for rotation about an axis, arranged to be rotated between a closed condition and an open condition, the rotatable obturator comprising an actuated seal (5) which is arranged to seal against a sealing surface (12a) of the valve body, and the actuated seal comprising a rearward surface (5e) arranged to be acted on by a pressurised fluid, and the seal mounted in the obturator for displacement outwardly from the obturator as the result of application of the pressurised fluid so as to seal against the sealing surface of the valve body in a substantially fluid-tight manner.

A butterfly valve comprising a valve body and a rotatable obturator (3), the rotatable obturator mounted in the valve body for rotation about an axis, arranged to be rotated between a closed condition and an open condition, the rotatable obturator comprising an actuated seal (5) which is arranged to seal against a sealing surface (12a) of the valve body, and the actuated seal comprising a rearward surface (5e) arranged to be acted on by a pressurised fluid, and the seal mounted in the obturator for displacement outwardly from the obturator as the result of application of the pressurised fluid so as to seal against the sealing surface of the valve body in a substantially fluid-tight manner.

A bonded seat for a butterfly valve can comprise a first axial end and a second axial end distal from the first axial end; a central section between the first axial end and the second axial end, the central section defining a radially inward surface and a radially outward surface, the radially inward surface defining a fluid bore therethrough from the first axial end to the second axial end, the radially outward surface defining a plurality of annular ribs.

A bonded seat for a butterfly valve can comprise a first axial end and a second axial end distal from the first axial end; a central section between the first axial end and the second axial end, the central section defining a radially inward surface and a radially outward surface, the radially inward surface defining a fluid bore therethrough from the first axial end to the second axial end, the radially outward surface defining a plurality of annular ribs.

A bonded seat for a butterfly valve can comprise a first axial end and a second axial end distal from the first axial end; a central section between the first axial end and the second axial end, the central section defining a radially inward surface and a radially outward surface, the radially inward surface defining a fluid bore therethrough from the first axial end to the second axial end, the radially outward surface defining a plurality of annular ribs.