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公开(公告)号：US11143209B2
公开(公告)日：2021-10-12
申请号：US17097487
申请日：2020-11-13
申请人： WALVOIL S.P.A.
摘要： A hydraulic circuit having a function of compensation and energy recovery comprises a distribution module, a three-way compensated regulator device, a variable flow rate or pressure feeding assembly, an energy recovery device connected to the three-way compensated regulator device. The distribution module comprises a spool including an inlet recess and a drain recess configured so that the flow rate of fluid inlet to the utility is equal to or less than the one outlet therefrom, possibly net of a correction factor. There is also a respective first driving channel and a second driving channel configured so that a pressure taken upstream of the drain recess acts on a first side of the regulator device, and so that a pressure taken downstream of the drain recess in the first channel acts on a second side of the regulator device, and an additional force.
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3.发明申请公开(公告)号：US20180372126A1
公开(公告)日：2018-12-27
申请号：US16063291
申请日：2016-12-16
申请人： WALVOIL S.P.A.
发明人： Ulderico BUSANI
IPC分类号： F15B11/05 , F15B11/042 , F15B11/16
摘要： Modular directional valve with two or more crossing elements (E1 . . . En) able, acting only on the entry side, to manage a variable displacement pump (PA) of the load sensing type.In particular, this management allows in a single drive, unlike the conventional crossing distributors, to make the flow rate to the utility independent of the load and allows setting a maximum flow rate at the end of the stroke; in multiple drives, it ensures that the sum of the required flow rates is independent of the loads.A compensated flow rate regulator is placed in the entry side so as to act only on the bypass line LC upstream of the first element (E1 . . . En) while a proportional choke is placed on the load line consisting of a 2-way 2-position tray.
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公开(公告)号：US20180372088A1
公开(公告)日：2018-12-27
申请号：US16063249
申请日：2015-12-16
申请人： WALVOIL S.P.A.
发明人： Massimiliano MUSIANI
摘要： Modular directional valve with two or more crossing elements (E1 . . . En) fed by a variable displacement (PA), negative control or load sensing pump.A pressure regulator (5) is placed in the entry side and only on the bypass line and upstream of the first element (E1 . . . En).In the single drive, it makes the flow rate to the utility independent of the load and allows setting a maximum flow rate at the end of the stroke; in multiple drives, it ensures that the sum of the required flow rates is independent of the loads.
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公开(公告)号：US20220373000A1
公开(公告)日：2022-11-24
申请号：US17723801
申请日：2022-04-19
申请人： WALVOIL S.P.A.
摘要： A hydraulic distributor includes at least one main spool configured to define a delivery branch, and a discharge branch, a feed branch and a pressure compensator configured such that a local pressure acts on a first side thereof and a maximum Load Sensing pressure acts on a second side characterizing either the working pressure of the hydraulic section, in the case in which there is only one hydraulic section, or, in the case in which there is a plurality of hydraulic sections, each one defining a respective characteristic pressure, of the maximum pressure among the characteristic pressures of the hydraulic sections. The pressure compensator is arranged such as to respectively intercept said delivery branch and said discharge branch.
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公开(公告)号：US10774851B2
公开(公告)日：2020-09-15
申请号：US16063287
申请日：2016-12-16
申请人： WALVOIL S.P.A.
IPC分类号： F15B11/17
摘要： A modular directional valve with two or more elements (E1, E2, E3, E4) in turn connectable to respective utilities (U) through the uses (A1, B1, A2 . . . B4); of which one or more elements (E1 E2) are of the CA type while one or more elements are of LS flow sharing type (E3, E4). The valve designed to be connected to a first high pressure line P1 which connects the crossing elements to a constant displacement pump (PA) and a second high pressure line P2 which connects the LS flow sharing type elements to a variable displacement pump LS, the connection to a low pressure line, the connection to a load sensing signal line (LS2) with the variable displacement pump LS (PB). Said valve acting so that if the load sensing flow sharing elements (E3, E4) fed by the line (P2) designed for the connection with the pump (PB) are in saturation, it withdraws from the carry over (6) of the group of elements (E1, E2) of the crossing type the amount of flow rate equal to the difference between the flow rate required by the utilities (U) of the elements (E3, E4) and the maximum flow rate which can be supplied by the LS pump (PB); otherwise, it freely delivers the flow rate of the constant displacement pump to the low pressure line.
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7.发明申请公开(公告)号：US20180258614A1
公开(公告)日：2018-09-13
申请号：US15910504
申请日：2018-03-02
申请人： WALVOIL S.P.A.
发明人： Amedeo MOROTTO , Davide MESTURINI
CPC分类号： E02F9/2225 , E02F3/34 , F15B11/165 , F15B13/06 , F15B13/0871 , F15B21/042 , F15B2211/3111 , F15B2211/41563 , F15B2211/428 , F15B2211/50536 , F15B2211/528 , F15B2211/66 , F15B2211/851
摘要： A distributor (3) of the closed-center, load sensing type, connected to a variable displacement pump (1) comprises a valve device (10, 110), composed of a logic element, which is pilot-operated and configured to bring a high-pressure channel (2) into communication with a low-pressure channel (4), the connection being usually opened by the combined action of an equivalent pressure generated by an elastic member (12) and a counter-pressure which is generated, under operative conditions, in the low-pressure channel (4). The connection is closed in a switching position and it is pilot-operated to a closure position by the combined action of a high-pressure signal (P) and a load sensing signal (LS).
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公开(公告)号：US11421796B2
公开(公告)日：2022-08-23
申请号：US16655604
申请日：2019-10-17
申请人： WALVOIL S.P.A.
发明人： Ulderico Busani , Davide Mesturini
摘要： A hydraulic system comprises a valve distributor comprising one or more sections connectable to respective uses, a supply apparatus comprising a pump and a supply channel, a discharge channel connected to a low-pressure tank, a use signal channel coming from the section of the valve distributor and further comprises a hydraulic regulating device connected via said channels which includes a 2-position 3-way proportional valve configured so as to provide operative fluid at a conditioned pressure, different with respect to the pressure that is characteristic of the operative condition of use, to the supply apparatus and at least one proportional pressure reducing valve.
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公开(公告)号：US11041514B2
公开(公告)日：2021-06-22
申请号：US15910504
申请日：2018-03-02
申请人： WALVOIL S.P.A.
发明人： Amedeo Morotto , Davide Mesturini
摘要： A distributor (3) of the closed-center, load sensing type, connected to a variable displacement pump (1) comprises a valve device (10, 110), composed of a logic element, which is pilot-operated and configured to bring a high-pressure channel (2) into communication with a low-pressure channel (4), the connection being usually opened by the combined action of an equivalent pressure generated by an elastic member (12) and a counter-pressure which is generated, under operative conditions, in the low-pressure channel (4). The connection is closed in a switching position and it is pilot-operated to a closure position by the combined action of a high-pressure signal (P) and a load sensing signal (LS).
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10.发明授权公开(公告)号：US10655648B2
公开(公告)日：2020-05-19
申请号：US16063291
申请日：2016-12-16
申请人： WALVOIL S.P.A.
发明人： Ulderico Busani
IPC分类号： F15B11/05 , F15B11/042 , F15B11/16 , F15B13/00
摘要： Modular directional valve with two or more crossing elements (E1 . . . En) able, acting only on the entry side, to manage a variable displacement pump (PA) of the load sensing type.In particular, this management allows in a single drive, unlike the conventional crossing distributors, to make the flow rate to the utility independent of the load and allows setting a maximum flow rate at the end of the stroke; in multiple drives, it ensures that the sum of the required flow rates is independent of the loads.A compensated flow rate regulator is placed in the entry side so as to act only on the bypass line LC upstream of the first element (E1 . . . En) while a proportional choke is placed on the load line consisting of a 2-way 2-position tray.
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