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WO1999036714A9 |
A voting solenoid arrangement (10) is provided which operates in a "2 out of 3" manner to provide relatively high safety, low spurious tripping and a relatively low installation cost, while also enabling on-line testing of each solenoid ...
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WO/1999/011939A1 |
The invention concerns a protective circuit provided with additional switching function by exciting an electric adjusting component. The excitation signals to said adjusting component (1) are guided, between a first removable plug-type c...
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WO/1999/010672A1 |
A fail-safe closure system comprises two control valves (122, 124), a piston actuator (126), a solenoid (147) for operating the control valves and an accumulator module (150). Supply pressurized fluid is applied to an opening chamber of ...
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WO/1998/053213A1 |
The invention relates to an actuation device for a hydraulically controlled actuator (10), specially for the emergency operation thereof, comprising a housing (14) with a fluid container (16) which can be connected to the actuator (10) v...
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WO/1998/052804A1 |
The invention relates to a hydraulic control device, specially for a fork lift, comprising a hydraulic consumer (55) used to bleed a spring-loaded brake (56), valves (46, 47, 57, 65) to supply pressure medium from a pressure line (11) to...
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WO/1998/045603A1 |
The invention relates to a hydraulic control device, comprising a directional valve (13), a hydraulic pump (18), and a built-in two-way valve (52) configured as a seat valve. The directional valve (13) is connected to an inlet line (34) ...
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WO/1998/040630A1 |
The invention relates to a hydraulic unit for feeding and controlling lifts, hydraulic platforms, loading tailboards, gates, etc. driven by means of hydraulic cylinders. Said unit comprises a hydraulic pump (4) driven by a motor (2) via ...
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WO/1998/023866A1 |
The present invention provides an actuator controlled by an electro-hydraulic servovalve (12) with a failfixed operation upon the loss of electrical power to the servovalve. A lock valve (69) has apertures therethrough with friction pads...
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WO/1998/006946A1 |
An apparatus for diagnosing failure of hydraulic pumps for a work machine, which apparatus is inexpensive and capable of surely specifying a faulty hydraulic pump or pumps. Pressure sensors (61-64) are provided on lines (30, 40) leading ...
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WO/1998/000200A1 |
A pump system for pumping liquids comprises a submerged pump, which is connected to a pressure pipeline and can be driven by means of a hydraulic drive comprising a hydraulic pump and a hydraulic motor, which are connected to one another...
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WO/1997/038228A1 |
The invention relates to a safety circuit for controlling a hydraulic drive (10) with a drive part (12) movable in at least two different directions of movement and controllable for any movement by a control switching circuit. A safety c...
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WO/1997/028318A1 |
A hydraulic circuit capable of locking and unlocking a plurality of actuators simultaneously, whether a control valve for fluid supply control of a hydraulic actuator is of pilot operated type or other type. The circuit comprises a chann...
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WO/1997/027995A1 |
The system is intended to control the time duration of the soft pushing action carried out when engaging the clutch and/or the brakes of hydraulic brakes-clutches to actuate presses and similar machines, as well as to cancel, at a predet...
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WO/1997/009553A1 |
A manifold assembly (10) for operating a safety relief valve (12) includes a manifold block (60) having a block inlet port (230), a block dome pressure port (232), and a pair of control cavities (220 and 222) each adapted for receiving a...
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WO/1997/004253A1 |
The description relates to a safety circuit for the alternating running of consumers, e.g. gear components of a power shift gear, and a proportional valve for such a safety circuit, in which the proportional valve can preferably be elect...
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WO/1996/035077A1 |
In a device (66) for safeguarding a CNC-controlled electro-hydraulic drive unit (11) against the disengagement owing to a fault of its moving part (18) from a stationary position in which it should be possible to conduct manual operation...
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WO/1996/027741A1 |
In a hydraulic controller, in order to easily provide a hydraulic back-up in the event of a failure of an electric system while maintaining a benefit of electrical control using a control unit (13) when controlling a displacement of a hy...
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WO/1996/015326A1 |
During manual operation, pilot pressure discharged from a pilot pump (41) is fed from a manual operation valve (44a) or (44b) through an electromagnetic change valve (49a) or (49b) to a main control valve (33). During automatic operation...
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WO/1996/010698A1 |
A device for driving a hydraulically controlled main valve (10) a first pilot valve (11) and a second pilot valve (12) for the same side of the main valve (10). Each pilot valve has a control oil inlet (17, 18), a control oil outlet (15,...
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WO/1996/001954A1 |
A control circuit for controlling a combined emergency shutdown and process protection (safety) system, especially on board platforms and vessels. There are two separate signal generators which, each by means of a control line (10, 17) o...
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WO/1995/033929A1 |
A safety switch is disclosed for electrohydraulically regulating a lifting mechanism. If deviations from the norm are detected at the main regulating valve when the regulation system starts to operate, locks are activated which allow the...
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WO/1995/023925A1 |
The invention relates to a safety arrangement on hydraulic piston-cylinder units, in particular for monitoring locking cylinders, e.g. of operating tools mounted on a grab bucket boom. A sensor for monitoring the piston position is provi...
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WO/1995/023958A1 |
An apparatus and method for detecting a leak in a closed, fluid transfer system, specifically a hydraulic system, by comparing the actual rate of fluid level change in the fluid reservoir to the rate of fluid level change computed from t...
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WO/1995/013043A1 |
A hydraulic system is proposed for the hydraulic operation of a height-adjustable ambulance lifting platform (H) for a stretcher which can also act as a suspension system. The system comprises a cylinder (Z) for operating the lifting pla...
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WO/1994/027052A1 |
When a solenoid proportional valve (91A) of a direction control valve (8A) is left open due to failure and an operator makes a reverse lever operation for operating an operation lever (4A) in an x2 direction, a low level signal is output...
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WO/1991/019108A1 |
The invention concerns a double-acting piston cylinder (10) in which the piston movements are transmitted by a displacement sensor (14) to an electronic control system (16). Acting on the piston rod (13A) is a mechanical brake (46). The ...
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WO/1991/004169A1 |
A control device for hydraulic working cylinders with a hydraulic medium pump (1) driven by a motor (2) which can be caused to communicate with a chamber of at least one lifting cylinder (11) and at least one lock cylinder (14) of the lo...
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WO/1990/002267A1 |
This invention relates to an oil pressure feeder which can prevent the abrupt fall of a work machine at the time of breakage of a piping arrangement for supplying a pressurized oil to a work machine cylinder and which can make the loweri...
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WO/1988/004367A1 |
The second stage (10) of a fail-fixed flow-control servovalve has a five-lobed valve spool (12) slidably mounted in a body bore (19). At null, the end lobes (41, 45) are substantially zero-lapped with respect to supply pressure slots (22...
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WO/1987/002427A1 |
A fault detector for a triplexed mechanical or hydromechanical system has a tripodal summing member (10, 60) which receives three mechanical position signals (18, 20, 22, 61-63) in three different channels with the tripodal summing membe...
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WO/1985/000204A1 |
Improvement to electro-fluidic relays susceptible of indicating either the maximal or the minimal threshold of pressure of a fluid circuit or the position of a movable member of a jack. The relay is comprised of a connector (1, 2) secure...
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WO/1984/001333A1 |
A relatively expensive, relatively heavy, and relatively nonflammable hydraulic fluid (chlorotrifluorethylene) is used in an aircraft ground wheel brake system between the piston (72) of a deboost device (68) and a set of wheel brakes (1...
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WO/1983/001604A1 |
Disclosed is a safety latch cylinder (48) for a tiltcab truck (10). The safety latch cylinder (48) comprises a hydraulic cylinder extension of which unlatches a cab latch mechanism (46) and a bypass to tank (30) through the hydraulic cyl...
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WO/1982/002229A1 |
A mechanism (80) is provided to controllably lower an actuator (28) upon the loss of a source (62) of pilot fluid in a fluid system requiring a float condition of operation. A resolver (80) is located in a vent line of a make-up valve an...
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WO/1982/000862A1 |
Hydraulic fluid powered actuation system for controlling the position of a control surface (162) of an aircraft in response to a plurality of redundant control signals. The system comprises a tandem actuator (10) adapted to be mounted in...
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WO/1981/003689A1 |
A fluid power control system (17) having an improved control valve (20) providing reduced regulated pressure fluid selectively from a high pressure pump supply (P) or the fluid motor (10) under conditions wherein the pump supply has fail...
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WO/1981/003685A1 |
A fluid system (10) having a directional control valve (12) operated by a pilot valve (11) having a manually operable control handle (22) for selectively controlling a fluid motor (14) in positioning a load (17). The pilot valve (11) inc...
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WO/1981/003527A1 |
A hydraulic piston cylinder device comprising a cylinder (1), a piston (2) dividing the cylinder into two cylinder spaces (A and B), and valve elements (7, 9) between the cylinder spaces (A and B) and the respective pressure medium pipes...
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JP7464860B2 |
To provide a hydraulic unit capable of determining leakage of a working fluid in hydraulic cylinders.A hydraulic unit (1) includes a control portion (20) for controlling a motor (13) in a process with operations of hydraulic cylinders (3...
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JP7459441B2 |
A cylinder failure prediction system of the present technology includes a data acquisition part configured to acquire a plurality of pieces of operation time data for each of a plurality of cylinders by repeatedly detecting operation tim...
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JP2024039722A |
An object of the present invention is to provide a valve remote control device that can remotely control a plurality of valves to be operated by operating one preliminary operation section. [Solution] A valve remote control device 100 fo...
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JP2024037171A |
An improved safety system for a machine is provided. A pressurizing device (28), at least one hydraulic cylinder (8) comprising a pressure chamber (46) and a piston (20) having a head (22) and a rod (24). at least one hydraulic cylinder ...
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JP2024035294A |
An object of the present invention is to provide a performance deterioration detection system for a hydraulic pump that can detect a deterioration in the performance of a hydraulic pump without using a flow meter. A hydraulic pump perfor...
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JP2024035295A |
An object of the present invention is to provide a performance deterioration detection system for a hydraulic pump that can detect a deterioration in the performance of a hydraulic pump without using a flow meter. [Solution] A hydraulic ...
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JP2024032348A |
[Problem] To easily realize accurate operation of a guide vane of a water turbine. [Solution] The bidirectional auxiliary pump is installed in parallel with the bidirectional control pump, and supplies hydraulic oil to the first hydrauli...
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JP2024027040A |
An object of the present invention is to provide a hydraulic pressure supply device and a hydraulic pressure supply method that can supply hydraulic pressure at a constant pressure for a fixed period even if some trouble occurs in a conn...
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JP7433100B2 |
To provide a hydraulic drive device of a work machine capable of correctly detecting a malfunction of a control valve.A hydraulic drive device of a work machine includes a hydraulic actuator (1), a control valve (11) that has a pair of p...
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JP2024021395A |
An object of the present invention is to detect malfunction of two solenoid valves that switch flow paths using one pressure sensor, and at the same time, to quickly and reliably exhaust residual pressure in an air device through the sol...
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JP7430780B2 |
A method for selectively coupling or uncoupling a coupling with a release, arranged between the supply conduit and a cylinder, on the basis of pressure in a supply conduit. The method includes providing an operating pressure prevailing i...
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JP2024011055A |
[Issue] During the lifting process of the loading platform, the hydraulic pressure of the hydraulic cylinder may increase due to overloading, or the hydraulic pressure of the hydraulic cylinder may increase even after the loading platfor...
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