A metal seal for a flap valve, is disclosed which has a valve housing with a flow channel, in the flow cross-section of which a valve disk is disposed such that it can be swiveled around a swivel axis between an open position and a shutoff position. The seal has sealing elements, which can be pressed against one another, and which are disposed on the outer circumference of the valve disk and on the inner circumference of the valve housing, and they have at least one annular metal sealing lip, which in the shutoff position bears with elastic preload on an oppositely situated, likewise annular metal mating sealing face. To prevent damage to outer components, the metal sealing lip is produced in an additive method from metal materials having shape, cross-sectional geometry and/or alloy adapted to the different circumferential regions of the metal sealing lip.

A metal sealing system for a triple eccentricity butterfly valve includes a dynamic metal seal, having a metal core surrounded by an external coating; a metal case with an external surface that has an inclined conical shape, including a first housing inside which the dynamic metal seal is mounted; a metal cover fixed to the metal case to allow it to close by flush fitting of the upper or lower faces of the metal cover and the metal case, the metal case having a second housing into which the metal cover fits, the dynamic metal seal being located between the metal cover and the surface of the metal case defining the first housing.

A valve seat includes an annular sealing body defining an inner seat surface and an outer seat surface, the inner seat surface defining an annular seating portion configured to seat with a valve member; and a circumferential sealing rib extending circumferentially about the annular sealing body, the circumferential sealing rib defining a gooseneck portion coupled to the annular sealing body and a bulbous portion coupled to the gooseneck portion opposite the annular sealing body.

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.

Diaphragm valves include plastic diaphragm and reduced or no elastomer backing cushion, where peripheral or all sealing forces may be applied directly to the diaphragm of the valve assembly. The valve assemblies may include a pressure ring to apply sealing force to a surface of the diaphragm with a reduced size or no backing cushion allowing a two-fold or more increase in pressure capacity of the valve assembly. An elastomer or metallic spring placed above a center diaphragm boss may provide center-to-edge compliance for passage seal.

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.

An arrangement for providing a seal for a valve is provided herein that can include a seat having an anchor portion, a connection portion extending radially from the anchor portion, and first and second sealing elements extending from opposing sides of the connection portion. First and second energizers can be respectively arranged on opposing sides of the connection portion and can be respectively positioned between the first and second sealing elements and the anchor portion of the seat. First and second retainers can be respectively positioned between the first and second energizers and the anchor portion of the seat on opposing sides of the connection portion.

An arrangement for providing a seal for a valve is provided herein that can include a seat having an anchor portion, a connection portion extending radially from the anchor portion, and first and second sealing elements extending from opposing sides of the connection portion. First and second energizers can be respectively arranged on opposing sides of the connection portion and can be respectively positioned between the first and second sealing elements and the anchor portion of the seat. First and second retainers can be respectively positioned between the first and second energizers and the anchor portion of the seat on opposing sides of the connection portion.

A butterfly valve having a disc shutter that engages a gasket whose configuration varies according to the action exerted on its external perimeter by a plurality of pressers sliding in the thickness of the valve body.