-
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.
-
公开(公告)号：US10247209B2
公开(公告)日：2019-04-02
申请号：US15326299
申请日：2015-07-15
申请人： WALVOIL S.P.A.
摘要： Hydraulic system, distributor and bidirectional valve to activate the hydraulic actuators (3; 3a, 3b) of an operating machine; the hydraulic system (1) having: a first high-pressure oil delivery (4); an oil drain (8); a slide valve with a spool, which is axially sliding and is suited to control a hydraulic actuator (3); a second low-pressure oil delivery (6); an activation valve (15); and a bidirectional valve (21) with a first passage opening (22) that can be hydraulically connected, by the slide valve (9) to the first delivery (4) and a second passage opening (23) hydraulically connected to the actuator (3); wherein, the bidirectional valve has an inlet opening (24) that can be connected, by the activation valve (15) to the second delivery (6) and an outlet opening (25) that can be connected, by the spool (12) to the drain (8).
-
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.
-
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).
-
-
-
搜索结果
4 条记录 (耗时 0.012 秒)