摘要:
There are provided: control valves 22 - 24 that control flow of pressure oil from the hydraulic source 21 to the hydraulic actuators 15 - 17; electric lever devices 51 - 53 that output electrical operation signals, which are drive instructions for the hydraulic actuators 15 - 17, in correspondence to lever operation; and a control unit 25 - 30 and 50 that controls the control valves 22 - 24 in correspondence to the operation signals. When the determination unit determines that an operation signal is not within the normal range, the hydraulic actuators 15 - 17 are allowed to be driven with flow of pressure oil to the hydraulic actuators 15 - 17 limited more significantly than in a case where it is decided that an operation signal is within the normal range.
摘要:
The hydraulic apparatus (1) comprises: pumping means (2) for pumping a fluid at a f first pressure (P1); user means (3) of said fluid at said first pressure (P1); emergency supply means (9, 109) connectabl e to said user means (3) activating a connection; activation means (6) of said connection that can be operated at a second pressure (P2) of said fluid different from said first pressure (P1) and interposed between said user means (3) and said emergency supply means (9, 109), said activation means (6) having a first connection configuration (106) wherein both said pumping means (2) and said emergency supply means (9, 109) are connected to said user means (3).
摘要:
Valve means comprises cursor means (6) arranged for directing suitably a flow of a fluid material, proportional magnet means (35, 35a, 35b) arranged for moving said cursor means (6), electronic control means (3) for supplying said magnet means (35, 35a, 35b), said electronic control means (3) comprising switch means (54) arranged for blocking a supply of said magnet means (35, 35a, 35b); a method for supplying magnet means, said magnet means (35, 35a, 35b) being comprised in valve means (1), comprises processing an external enabling signal, said method comprising further processing an internal enabling signal, said internal enabling signal being generated by said valve means (1).
摘要:
A method of operating a fail-fixed hydraulic actuator system (13) is provided. The method includes providing an actuator (40) in an initial position, electromechanically operating a valve assembly (30) to hydraulically drive actuator movement and halting the hydraulic driving of the actuator movement by the valve assembly (30).
摘要:
A hydraulic system for a multiple friction transmission, comprising: a first pressure relief valve 5 regulable by means of a first pilot pressure; a normally-open drain valve 8, which is a directional valve switchable between an open state and a closed state by means of a second pilot pressure; at least one first pressure regulator 11 for operating the drain valve by means of a first pilot pressure and a second pilot pressure, respectively; wherein in the event of detrimental hydraulic pressure build up, the second pilot pressure is dropped to open the drain valve, so as to relieve pressure through the drain line.
摘要:
Bei einem pneumatischen Volumenstromverstärker (1) zum Verstärken eines pneumatischen Stelldruckausgangssignals eines Stellungsreglers, der einen pneumatischen Antrieb, wie einen pneumatischen Stellantrieb (73), zum Betätigen einer Stellarmatur, wie eines Stellventils, einer prozesstechnischen Anlage, wie einer petrochemischen Anlage, einer Lebensmittelverarbeitungsanlage, wie eine Brauerei, oder dergleichen, belüftet und/oder entlüftet, ist vorgesehen: einen pneumatischen Steuerausgang (23) zum Anschluss an eine pneumatische Arbeitskammer des pneumatischen Antriebs, einen ersten pneumatischen Belüftungseingang (15) insbesondere zum Empfangen eines pneumatischen Stelldruckausgangssignals eines Stellungsreglers, wenigstens einen pneumatischen Verstärkungseingang (17), insbesondere zum Empfangen eines insbesondere konstanten pneumatischen Luftverstärkungssignals, wie eines Boostersignals, eine pneumatische Entlüftungsverbindung von dem Steuerausgangs zu einer Drucksenke zum Entlüften des Stellantriebs, ein die pneumatische Entlüftungsverbindung trennendes und/oder öffnendes Entlüftungssitzventil (3), eine pneumatische Belüftungsverbindung zwischen dem ersten Belüftungseingang und dem Steuerausgang; ein die pneumatische Belüftungsverbindung trennendes und/oder öffnendes Belüftungssitzventil (5), eine pneumatische Verstärkungsverbindung zwischen dem Verstärkungseingang und dem Steuerausgang; ein die pneumatische Verstärkungsverbindung trennendes und/oder öffnendes Verstärkungssitzventil (7); und eine mechanische Sitzventil-Betätigung zum gemeinsamen Betätigen des Entlüftungssitzventils, des ersten Belüftungssitzventils und des Verstärkungssitzventils.
摘要:
The invention relates to a safe hydraulic drive system and a process for operating such a drive system, moving a piston rod (23) of at least one cylinder (2), comprising at least one first cylinder chamber (21) and a second, separate cylinder chamber (22), which are connected to one another via a connecting line (3) to form a fluid-filled hydraulic circuit, and a hydraulic drive (4) for conveying (UN, US) the fluid (F) from one cylinder chamber (21, 22), via the connecting line (3), into the other cylinder chamber (21, 22), in which the connecting line (3) is arranged, wherein the connecting line (3) has at least one parallel system, between the hydraulic drive (4) and one of the two cylinder chambers (21, 22), consisting of at least one first sub-connection (31) with at least one first stop valve (311) and a second sub-connection (32) with a baffle (322) arranged therein, wherein the connecting line (3), excluding the second sub-connection (32), has a first flow resistance and the second sub-connection has a second flow resistance due to the baffle (322) arranged therein, which is greater than the first flow resistance for the fluid (F), wherein the drive system (1) is provided with at least one open first stop valve (311) in normal mode (N) and with a closed first stop valve (311) in safe mode (S) for conveying (UN) the fluid (F), and a suitably high second flow resistance has been selected so that a maximum permissible speed for the piston rod (23) is not exceeded in safe mode (S), even when an external force (FG) acts on the drive system (1) in the direction of movement (B) of the piston rod (23).
摘要:
Aspects of embodiments of the invention relate to a spring-return actuator comprising a first piston movable between a first and a second position by pressurized fluid to move a load; a safety system comprising a second piston movable by the pressurized fluid to arm the safety system and which returns the first piston from the second position to the first position when de-energizing the 3/2 pilot valve or when the pressure of the pressurized fluid drops below a safety pressure threshold; and a differential fluid channel for providing the pressurized fluid and configured so that the first piston while working to move the load remains substantially disengaged from the safety system being armed.