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    • 15. 发明公开
    • HIGH PRESSURE ABRASIVE SLURRY CHECK VALVE
    • 单向阀是否高压磨料MUD
    • EP0792427A1
    • 1997-09-03
    • EP95938715.0
    • 1995-10-02
    • MINNESOTA MINING AND MANUFACTURING COMPANY
    • SERAFIN, Mark
    • F16K15F04B53
    • F04B53/1022Y10T137/7866Y10T137/7939
    • A piston check valve (10, 20) for use in a system which conveys abrasive materials includes a gland nut (22) which connects the valve to the piping system, a valve body (24) mounted on the gland nut (22), a valve seat (14, 26) mounted on the valve body (24), and a piston (38) mounted within the valve body (24). The piston (38) can translate within the through bore (36) of the valve seat (14, 26) and has a shaft (40) and a head (42) which contacts the first end (30) of the valve seat (14, 26) when the valve is closed. A coil spring (52) is located within the through bore (36) of the valve seat (14, 26) and biases the valve closed. A first O-ring (56) is mounted on the first end (30) of the valve seat (14, 26) and is sufficiently wide to prevent sufficient quantities of chips from becoming lodged within the surface of the inner O-ring (56) to form a hard bridge across the O-ring (56), allowing erosion of the valve sealing surfaces. The first end (30) of the valve seat (14, 26) has an O-ring groove (58) which receives the O-ring (56). A second O-ring (60) can be mounted on the first end (30) of the valve seat (14, 26) at the outer periphery of the valve seat (14, 26).
    • 16. 发明授权
    • DRUCKVENTIL
    • 压力阀
    • EP0454799B1
    • 1993-09-22
    • EP90915292.8
    • 1990-10-24
    • ROBERT BOSCH GMBH
    • OBERL, JohannSCHMIDT, HermannLUTZ, Rolf
    • F02M59/46
    • F02M59/462F01M1/16F02M2200/04Y10T137/7867Y10T137/7939
    • Proposed is a pressure valve fitted in the feed line (7, 7') leading from a fuel-injection pump to a fuel-injection valve (8). The pressure valve has a closure element (121) which opens in the fuel-feed direction and which has a return-flow shoulder (135). To ensure uniform injection, in particular at a given load over the engine-speed range, the rate of increase of the cross-sectional area of the flow passage defined by the valve closure element (121) is controlled by virtue of the fact that, immediately adjacent to the return-flow shoulder (135), is a control element (131) with three recesses (138) round its perimeter. These recesses are bounded by the through-channel (120) in which the valve-closure element (121) is guided, and have the same, given, opening area, the sum of the opening areas being of the same order of magnitude as the cross-sectional area of the feed line. As the stroke movement progresses, the rim (139) bounding the recesses (138) on the flow-return shoulder (135) and the rim (122) at the outlet of the through-channel (120) together leave in the zone of the recesses (138) a complete passage which is never larger in cross-section area than the cross-sectional area of one recess.
    • 18. 发明公开
    • DRUCKVENTIL
    • 压阀门。
    • EP0454799A1
    • 1991-11-06
    • EP90915292.0
    • 1990-10-24
    • ROBERT BOSCH GmbH
    • OBERL, JohannSCHMIDT, HermannLUTZ, Rolf
    • F01M1F02M59
    • F02M59/462F01M1/16F02M2200/04Y10T137/7867Y10T137/7939
    • Il est proposé une soupape de refoulement, montée dans le conduit de refoulement (7, 7') allant d'une pompe d'injection de carburant à une vanne d'injection de carburant (8), et présentant un organe d'obturation (121) ouvert dans le sens de la circulation et muni d'un collet aspirant de rappel (135). En vue d'obtenir une injection uniforme, en particulier un régime uniforme d'injection pour une charge déterminée intervenant à une vitesse de rotation donnée, la vitesse d'ouverture de la section de raccordement sur l'organe d'obturation (121) est réglée de telle façon qu'il est prévu, directement raccordée au collet (135), une pièce de guidage (131) comportant trois évidements (138) sur son pourtour. Ceux-ci sont limités par un canal de passage (120) guidant l'organe d'obturation (121) et présentent une section de passage définie de même grosseur qui est, globalement, de l'ordre de grandeur de la section dudit conduit de refoulement. Avec les bords (139) limitant les évidements (138) du côté du collet (135), ainsi qu'avec les bords de sortie (122) du canal de passage (120), on obtient, lorsque la course est croissante, une section totale de jonction, libre sur les évidements (138), qui n'est jamais supérieure à la section de passage.
    • 20. 发明公开
    • Backflow preventer
    • 防回流
    • EP2116749A3
    • 2011-03-09
    • EP09006032.8
    • 2009-04-30
    • Shinshu UniversityNippo Valve Company Ltd.
    • Matsubara, MasaharuTakeda, Yuichi
    • F16K15/02F16K17/08
    • F16K15/026F16K17/085Y10T137/3331Y10T137/7838Y10T137/7939Y10T137/87917Y10T137/88054
    • A first check valve has a narrow flow path portion (68) formed between an arcuate portion (46) of the outer periphery (45) of a support member and a second enlarged-diameter portion (11) of a casing. The narrow flow path portion (first portion of an intermediate flow path) is in fluidic communication with a back-pressure chamber (50) defined in the support member at the rear of the top of a valving element through a communicating passage (67) including a gap (66) between the outer periphery of the valving element and the inner periphery of a large-diameter portion (38) and grooves (27) on the rear surface of the top of the valving element. Thus, a low static pressure of fluid flowing through the narrow flow path portion is introduced into the back-pressure chamber to move the valving element by a large differential pressure during the supply of fluid, thereby allowing the valve opening to become larger than in the conventional apparatus and enabling a reduction of pressure losses. An intermediate chamber has a pressure chamber (130) defined therein by using a rigid partition (see figure 6). A high-pressure chamber (131) of the pressure chamber is in communication with the upstream side of the first check valve, and a low-pressure chamber (132) thereof is in communication with the narrow flow path portion. Thus, a valving element (136) is acted upon by a force larger than the differential pressure between the upstream side and an internal flow path (106) of the intermediate chamber, thereby allowing a relief valve (135) to be surely kept closed.