Abstract:
The present invention relates to sealing valves used in the petroleum and gas extraction industry, in particular but not exclusively, to medium- or high-pressure ball valves. In particular, the present invention relates to a sealing assembly (101, 102) for ball valves (1), and to a ball valve comprising such an improved sealing assembly. The sealing assembly ensures excellent sealing performance at low and high pressures by exclusively using a thermoplastic material sealing element (31), thus completely eliminating the drawbacks which afflict the sealing system of known type, in particular in relation to the reliability of the sealing elements made of elastomeric material.
Abstract:
A ball valve for a fluid transporting pipe line comprising one or more gaskets (5), where each gasket is mounted in a groove, track or similar area between a first and a second essentially parallel surfaces (7, 8), where each gasket is intended for being pressed against at least a third surface (10) in the groove by means of a force acting against the gasket, where the force is at least applied by fluid in the valve. The force F is divided between two sealing points. The result is an increased sealing force, R FP , or reaction acting between the gasket and the surface of the groove in each sealing point, which increases the sealing efficiency when applying the same force F to the gasket.
Abstract:
Válvula(100) de bola criogénica guiada, para la apertura o cierre del paso de un fluido por unos conductos de entrada/salida(103, 104), que comprende al menos un anillo de asiento(114) flotante que cierra estancamente contra la bola(107) por efecto de la presión del fluido en el conducto de entrada/salida(103, 104) sin necesidad de apretar el anillo de asiento(114) contra la bola(107) por medio de tuercas u otros elementos mecánicos que elevan el par de maniobra de la válvula(100) indeseadamente. La válvula(100) puede comprender además un sistema de alivio de sobrepresiones internas en el cual la sobrepresión interna provoca una ligera separación temporal del anillo de asiento respecto a la bola, hasta que la presión interna se iguala con la presión del conducto de entrada/salida y el anillo de asiento vuelve a cerrarse automáticamente contra la bola.
Abstract:
A seal assembly (24) is provided for a rotary ball valve (10) comprising an eccentric cammed ball. The seal assembly may include a seal ring (44) disposed within the valve interior and biased toward the ball element (30) of the valve. A seal ring retainer (46) may be threadedly secured to an interior of the valve body (12), thereby retaining the seal ring in the valve body.
Abstract:
Le robinet (1) comporte : - un corps (2) présentant un canal d'axe (3) ; - un obturateur (6) tournant sphérique monté pivotant dans le corps, entre une position fermée et une position ouverte, l'obturateur comportant un orifice traversant (10) permettant le passage de fluide d'une conduite amont à une conduite aval, en position ouverte ; - un siège amont (15) présentant un passage central (16), monté dans le canal du corps en amont de l'obturateur de façon mobile en translation le long de l'axe (3) et sollicité vers l'obturateur par des moyens élastiques (27) ; - un bossage (31) ménagé sur le siège amont en saillie vers l'obturateur, et un évidement ménagé sur l'obturateur, agencé pour coopérer avec le bossage en position fermée de l'obturateur ; - des moyens d'équilibrage de la pression entre l'amont et l'aval du siège amont, avant l'ouverture du robinet.
Abstract:
The method and the system according to the invention rely on that gas from gas piping (16) , to which a ball valve (17) is installed, is used as working medium. The working medium is delivered from a by-pass pipe Q) connected to gas piping (16) and next by means of a two-way valve (2) and three-way pipe (3) and hole (4) in the body of the ball valve (17) to working chambers (5) . As the result of supply of medium there is retraction of holders (S) with packing rings (10) from the ball closing component (13) , which enables txirning of the ball closing component (13) in the valve after a long time of standstill .
Abstract:
The invention relates to the provision of a valve which can be fitted to a pipeline to allow the control of the flow of fluid therealong. The valve includes at least one ball (10) having a first sealing means (14) positioned upstream of the ball and a second sealing means (16) positioned downstream of the ball. The first sealing means is movable under the influence of fluid pressure towards the ball to form a seal thereon and the ball and said first sealing means are movable under the influence of the fluid towards the second sealing means to form a second seal on the ball thus providing a double sealing arrangement with a single ball rather than the conventional two ball arrangements sealing arrangements.
Abstract:
A ball valve equipped with a ball closing component (1) a cover (18) and seals assemblies (2) having sediment rings (5) with seals (6) characterised in that on the lateral surface of each sediment ring (5) there is a flange (9), having from the side of a ball closing component (1), working surface (10). The space of the recess (3) of a body (4) contains a working chamber (11) placed between working surface (10) of the flange (9) and a closing ring (12) screwed down to the inner part of the body (4) and a chamber (13) placed from the back wall (8) of the recess (3). The working chamber (11) is connected in a passage way with the interior of the body (4).
Abstract:
Valve member for a ball valve, in particular a large ball valve for use in oil and gas installations for offshore production, of the kind comprising a rotatable valve member (2) having a through passage (6), two moveable seat or seal holders (8, 9) and means (11, 12) for moving the holders (8, 9) in a direction towards and from cooperating portions of the valve member. Three main parts (6, 21, 22) of the valve member are made of a tubular material being in principle of the same diameter, and one main part being in the form of a tube section (6) which forms said through passage. The other two main parts (21, 22) are joined to said one main part (6) at diametrically opposite sides thereof so that the axes of the three main parts intersect at the rotational axis (20) of the valve member and extend at right angles thereto. The free ends of the three main parts (6, 21, 22) are designed with said cooperating portions (6A, 21A, 22A), lie in planes forming a right angle to their respective axes and have approximately the same distance from the rotational axis (20).
Abstract:
A system includes a ball valve. The ball valve includes a housing (15), a ball (20), and a first valve seat assembly. The housing (15) includes a chamber, a first fluid passage (28) intersecting the chamber, and a second fluid passage (30) intersecting the chamber. The ball (20) is disposed in the chamber and is configured to control fluid flow between the first and second fluid passages. The first valve seat assembly is disposed between the ball (20)n and the housing (15). The first valve seat assembly includes a first seat (40) configured to seat against the ball (20) both above and below a pressure threshold, and a second seat (42) configured to seat against the ball (20) only above the pressure threshold, wherein the second seat (42) has a coefficient of friction that is lower than the first seat (40).