A hydraulic system includes: a solenoid valve that includes a valve spool configured to slide within a housing, and moves the valve spool to a position corresponding to an operation command input to the solenoid valve; and a control device that outputs the operation command to the solenoid valve. When a predetermined condition is satisfied, the control device outputs a continuously or intermittently changing operation command to the solenoid valve to reciprocate the valve spool from a full open position or a full closed position.

A hose assembly for a hydraulic system is shown. The hose assembly includes a first hose that fluidly couples a pump with a hydraulic actuator using a first port. The first hose includes a first electronic device that provides identification information for the first hose. The hose assembly further includes a second hose that fluidly couples the hydraulic actuator with a reservoir tank using a second port. The second hose includes a second electronic device that provides identification information for the second hose. The hose assembly further includes a controller that receives a first connection signal and a second connection signal. The controller is further configured to determine that the first hose has fluidly coupled using the first port based on the first connection signal and determine that the second hose has fluidly coupled using the second port based on the second connection signal.

A valve assembly includes a valve moveable between an open position where hydraulic fluid flow is permitted and a closed position where hydraulic fluid flow is blocked. A controller includes a magnetometer adapted to measure a magnetic flux through at least a portion of a solenoid linear actuator that moves the valve. A magnetic flux value measured by the magnetometer corresponds to a linear position of the regulating member relative to the port.

For the purpose of providing a valve arrangement for controlling pneumatic drives with protection against a sudden automatic change in the initial switching position without an input signal in the event of a fault in a resetting device of a pilot stage and, for this situation, effective fault identification by purely pneumatic means, said valve arrangement comprises a first and a second working connection (1; 2), which can be connected to a drive, and a first and a second electropneumatically pilot-controlled directional valve, in which valve arrangement one or both directional valves is or are arranged upstream of the working connections (1; 2) for the purpose of influencing and venting said working connections, wherein the pilot stages of both directional valves are of automatically resetting design and the second directional valve is designed for alternately assuming an inoperative position and a switching position and the pilot stage of the first directional valve has an external control connection (8; 8′) which can be influenced by means of the second directional valve in its switching position and can be vented by means of said second directional valve in its inoperative position, wherein the second directional valve has, as a resetting device for the main stage (14), an air spring (19) which can be influenced and can be vented externally by means of the first directional valve, and a change in state between influencing or venting of the air spring (19) after the first directional valve assumes a switching position takes place only depending on the change in the switching state of the first directional valve, and a change in state between influencing or venting at one working connection (1; 2) after previous influencing or venting which took place with the second directional valve assuming the switching position takes place only depending on the second directional valve assuming the inoperative position.

A redundant valve manifold system includes at least two automatic valves coupled to one another and at least two automatic isolation valves each corresponding to one of the at least two automatic valves. Each of at least two automatic isolation valves is operatively coupled to one of the at least two automatic valves and isolates the one of the at least two automatic valves when the one of the at least two automatic valves is removed from the system to deliver media to an outlet.

A solenoid driven actuator system includes a first solenoid having at least one pressure input and a pressure outlet downstream from the at least one pressure input. The system includes a second solenoid having at least one pressure input and a pressure outlet downstream from the at least one pressure input. The system includes a pressure-switching valve operatively coupled to the first and second solenoids. The system includes an actuator operatively coupled to the pressure outlet of the second solenoid.

A wheelchair lift system for a vehicle comprises: a platform for accommodating a wheelchair; a lifting arm; a hydraulic circuit including a hydraulic actuator arranged to act on the lifting arm to raise and lower the platform; a barrier mounted on the platform and pivotable between a raised position and a lowered position; a plurality of sensors each arranged to generate a sensor output; a user input device arranged to generate control signals to control operation of the lift; and a control unit. The control unit is arranged to receive the control signals and to receive the sensor output from each of the sensors and to control the hydraulic circuit thereby to control of the lift to perform a number of different operations. The control unit is also operable in a fully operational mode and a safety mode and is arranged to perform a plurality of checks on the sensor outputs, and to record a result of each of the checks, and to switch between the fully operational mode and the safety mode based on the results.

A monitoring system (500) of an on/off type actuator device (1) for activating a valve for fluid pipelines is described, the actuator device (1) being configured to move a valve member of said valve between a first position and a second position. The actuator device (1) comprises at least one fluid cylinder (6) configured to control a linear movement of an actuator rod (8). The monitoring system (500) comprises a plurality of sensors mounted on the actuator device (1) and configured to detect a plurality of operating parameters of the actuator device, and an electronic processing and control unit (50). The electronic processing and control unit (50) is configured to impart a micro-movement to the valve member, to detect signals indicative of the values of said operating parameters during said micro-movement of the valve member, and as a function of said values of said detected operating parameters to estimate if said actuator device (1) is capable of applying a torque or force value sufficient to make said valve member perform the entire movement from the first position to the second position. The micro-movement is such as to constitute only the start of movement of the movable member of the valve, corresponding only to the overcoming of mechanical clearances and dissipative and deformation effects internal to the actuator (1), and furthermore is such as not to substantially involve any alteration in the flow of fluid controlled by the valve. In this way, it is possible to estimate the state of health of the actuator device (1) without causing variations in the flow of fluid through the aforesaid valve.

A hydraulic system includes: a solenoid valve that includes a valve spool configured to slide within a housing, and moves the valve spool to a position corresponding to an operation command input to the solenoid valve; and a control device that outputs the operation command to the solenoid valve. When a predetermined condition is satisfied, the control device outputs a continuously or intermittently changing operation command to the solenoid valve to reciprocate the valve spool from a full open position or a full closed position.

Valve arrangement for influencing a fluid flow for a fluid consumer, having a first valve group with which a first actuator is associated, having a second valve group with which a second actuator is associated, the first valve group and second valve group being associated in a first functional position as a parallel circuit with a first fluid line in a first functional position and are associated with a second fluid line in a second functional position as a series circuit, the first valve group or second valve group being designed for actuating the respective other actuator in the first functional position and being designed for switching off the respective other actuator in the second functional position.