摘要:
A device for blocking a liquid flow through a pipe in one direction, said device being provided with a substantially spherical valve body, which can closingly cooperate with a substantially annular valve seat, which is positioned substantially transversely to the liquid flow. Means are provided for guiding said valve body in a path between a position in which said valve body is positioned near or against said valve seat (closed position) and a position in which the valve body is spaced from the valve seat by some distance (open position). In its open position said valve body can be positioned almost entirely outside the liquid flow. Means can be provided for effecting a reduction of the liquid pressure within the valve casing, at the side of the valve body remote from the valve seat.
摘要:
A scroll type hermetic compressor (10) is disclosed which incorporates an improved disc type check valve (44) in the discharge conduit exiting from the compressor shell. The check valve operates to prevent return of high pressure refrigerant which may cause reverse movement of the orbiting scroll upon shut down of the compressor.
摘要:
Un dispositif d'expansion pour un système de réfrigération comprend un logement (21) ayant des orifices opposés (22, 23) séparés l'un de l'autre par un siège de soupape interne (30) du logement (21). Le logement contient un piston mobile (44) ayant une première surface extrême (45) adaptée pour venir s'appuyer contre un siège de soupape (30) et la fermer lorsque le piston (44) se trouve dans une première position, et une seconde surface extrême (46) venant s'appuyer contre un épaulement annulaire (40) lorsque le piston (44) se trouve dans une seconde position. Le piston (44) possède un passage traversant (47) permettant de relier les orifices opposés (22, 23) d'une manière restreinte lorsque le piston (44) se trouve dans sa première position, et une surface périphérique externe (49) ayant une pluralité de rainures (48) permettant de relier les orifices opposés (22, 23) d'une manière sensiblement non restreinte lorsque le piston (44) se trouve dans sa seconde position. Le piston (44) comprend un élément en une seule pièce en matériau polymère, la première surface extrême (45) du piston (44) comprenant une section sensiblement hémisphérique (50).
摘要:
A method for injecting a fluid into an oil and or gas reservoir or formation, in which the fluid flows into the reservoir or formation through a plurality of autonomous valves or flow control devices (2) provided along an injector (24), the valves (2) having a substantially constant flow-through volume above a given differential pressure for autonomously adjusting the flow of the fluid in order to ensure a substantially constant volume rate from the injector (24) to the reservoir or formation along an injector length.
摘要:
The invention relates to a backflow preventer (1) comprising a valve member (6) in the interior (5) of the insertable housing (2) thereof. Said valve member (6) sealingly rests against a valve seat (7) in the closed position thereof while being movable from the closed position thereof into the open position thereof counter to a restoring force. The interior (5) of the housing is provided with an interior section (A) which has an interior cross section that is larger than the outer circumference of the valve member in the movement zone of the valve member (6). The aim of the invention is to prevent undesired noise from developing as a result of the valve member (6) vibrating on the inner circumference of the housing also when the quantity of penetrating medium is low. Said aim is achieved by providing at least the movement zone of the backflow preventer (1), which is located near the valve seat (7), with an elastic valve member guide (9) that is effective between the valve member (6) and the interior housing wall surrounding the interior section (A) so as to guide the valve member (6) free from play.
摘要:
Die Erfindung betrifft ein Rückschlagventil mit einem Ventilgehäuse (2) einem Ventilteller (18), der in dem Ventilgehäuse (2) in vertikaler Richtung zwischen einer Öffnungsstellung und einer Schließstellung, in der Dichtungsflächen (19A, 19B) am Ventilteller (18) und Ventilsitz (20) dichtend in Anlage kommen, bewegbar ist. Das Rückschlagventil ist dadurch gekennzeichnet, daß der Ventilteller (18) ausgehend von seiner Führungsfläche (21) unter Bildung einer geneigten Mantelfläche (18A) einen in Richtung des Ventilsitzes (20) kleiner werdenden Durchmesser besitzt, und daß die Durchflußöffnungen (22) in dem Ventilteller (18) von der geneigten Mantelfläche (18A) ausgehen und in der von der Dichtungsfläche (19A) weg weisenden Richtung schräg aufeinander zu laufen und gleichmäßig über den Umfang des Ventiltellers (18) verteilt angeordnet sind. Die Erfindung betrifft weiterhin einen Ventilteller (18) für den Einsatz in einem solchen Rückschlagventil.
摘要:
A miniaturised device for producing high pressure in a fluid imposes stringent requirements on the manufacturing process. The device according to the invention consists of a hollow piston (57) displaceably mounted in a cylinder and a valve member (58) which is guided by the hollow piston (57) and mounted so as to be axially movable relative to the hollow piston (57). The valve member (58) is arranged at one end of the hollow piston (57) inside or immediately in front of the end of the hollow piston (57). The device is used in a mechanically operated high pressure atomiser. This consists of a two-part housing which comprises a pump housing (52) with nozzle (54), a blocking mechanism (62), a spring housing (67) with spring (68), a non-pressurised storage container (71) for the fluid (72) and a mechanical counter integrated in the spring housing (67). The valve (58) operates without any auxiliary force, closes very rapidly and is sealed tight against high pressure. The atomiser is safe and simple to operate and environmentally friendly. The fluid is metered extremely accurately. The atomiser is used, for example, to produce an inhalable aerosol of a liquid medicament without the use of a propellant gas, at 320 bar, for example.