The present disclosure provides a hydraulic system for a material handling vehicle. The hydraulic system includes a reservoir tank, a pump configured to draw fluid from the reservoir tank, and an auxiliary circuit having an auxiliary filter. The auxiliary circuit is in fluid communication with one or more auxiliary functions that are configured to receive fluid from the pump and return fluid to the reservoir tank. When the one of the one or more auxiliary functions is commanded, fluid flow is provided from the pump to the reservoir tank through the auxiliary filter.

It is made possible to prevent damage to hydraulic parts of a work machine due to a decrease in performance of a hydraulic fluid even when the hydraulic fluid of a hydraulic system is changed and the hydraulic fluid becomes a mixed oil in which a mineral oil and a biodegradable oil are mixed with each other. For this purpose, a storage device stores, in advance, oil change history information of the hydraulic fluid, oil kind determination values for determining whether the hydraulic fluid is either the mineral oil or the biodegradable oil or the mixed oil of the mineral oil and the biodegradable oil, and abnormality determination values for respective kinds of the hydraulic fluid. A controller checks whether the oil change history information includes oil change information for which oil kind determination has not been made. When there is oil change information for which oil kind determination has not been made, the controller determines a kind of the hydraulic fluid on the basis of the respective values of a plurality of oil properties detected by an oil sensor and the oil kind determination values. The controller determines an abnormality in the hydraulic fluid by using abnormality determination values corresponding to a result of determination of the kind of the hydraulic fluid.

An apparatus for controlling hydraulically actuatable components of a blowout preventer stack assembly and a system for same. The apparatus comprises a blowout preventer stack including hydraulically actuatable components and a lower marine riser package coupled to the blowout preventer stack and including additional hydraulic components. The lower marine riser package includes a solenoid valve configured to control at least some of the components. The solenoid valve receives hydraulic fluid from a dedicated accumulator or accumulator bank configured to supply hydraulic fluid exclusively for use with the solenoid valve. A closed-loop hydraulic circuit is formed between the accumulator or accumulator bank and the solenoid valve.

A technology is disclosed for controlling the function of a pneumatic valve actuator. The piston of the valve actuator is biased to be in first state and move to a second state when pressurized. A conduit connects the pressure side and non-pressure sides of the valve actuator for supplying the non-pressure side of the valve actuator with gas from the pressure side of the valve actuator. A control valve is connected to the conduit for controlling a release of gas from the pressure side of the valve actuator. The valve controller also has pressure-relief valve connected to the conduit between the control valve and the non-pressure side of the valve actuator for reducing the pressure in the conduit.

A vehicle comprising a hydraulic fluid reservoir, a hydraulic fluid pump, a hydraulic filter, a sensor, and a vehicle control unit. The hydraulic fluid reservoir may have a bottom portion filled with hydraulic fluid and a top portion filled with air. The hydraulic fluid pump may be hydraulically coupled to the hydraulic fluid reservoir so as to draw hydraulic fluid from the hydraulic fluid reservoir. The hydraulic filter may be hydraulically coupled to the hydraulic fluid reservoir so as to filter debris from the hydraulic fluid entering the hydraulic fluid reservoir. The sensor may be in communication with the vehicle control unit where the sensor is configured to measure a variable indicative of a failure status of the hydraulic filter and communicate the variable to the vehicle control unit. The vehicle control unit may be configured to derate the hydraulic fluid pump to a first degree when the variable indicative of the failure status of the hydraulic filter is above a first threshold and configured to derate the hydraulic fluid pump to a second degree when the variable indicative of the failure status of the hydraulic filter is above a second threshold.

A system may comprise a first sensor; a second sensor; and an electronic control module. The electronic control module may be configured to determine a flow of the fluid based on information regarding the pressure from the first sensor and information regarding the temperature from the second sensor; determine a portion of the flow of the fluid that is directed to a particle counter of the machine; receive, from the particle counter, information identifying a quantity of particles in the portion of the flow of the fluid; determine a quality of the fluid based on the quantity of particles; determine whether the flow of the fluid exceeds a flow threshold or whether the quality of the fluid is less than a quality threshold; and take a remedial action when the flow of the fluid exceeds the flow threshold or the quality of the fluid is less than the quality threshold.

An accumulator piston, in particular a piston for a pressure medium accumulator of a hydraulic unit of an electronically slip-controllable vehicle brake system, includes a cylindrical piston shaft, and a piston head covering the piston shaft. The piston head includes a circumferentially closed blind-hole-shaped recess having an opening. A cross section of the recess in a region of the opening has at least one smaller dimension than a cross section in a region of a base of the recess opposite the opening. The recess forms a mechanism configured to separate particles out from the pressure medium.

A hydraulic assembly for modulating a brake pressure of a wheel brake of a motor vehicle brake system with electronic slip control includes a housing block through which a brake fluid is configured to flow and which is equipped with an electronically controllable member for setting the brake pressure. The hydraulic assembly also includes at least one particle-filtering device that is fitted with the housing block and forms a magnetic field. Using the particle-filtering device, particles of ferromagnetic material are configured to be filtered out of the brake fluid without reducing a cross-section of a fluid-conducting channel and thereby choking the throughflow of the housing block or hindering the fluid throughflow.

A method and device control at least one air dryer unit of an air supply system for the primary and auxiliary air supply of a vehicle. In the method and device, at least one compressor is driven by an associated electric motor that serves both for the primary air supply of a primary air tank and for the auxiliary air supply of an auxiliary air tank. Compressed air generated by the compressor is channeled over the at least one downstream air dryer unit so as to dry the compressed air generated by the compressor while the drying agent of the air dryer is regenerated with dried compressed air. During the auxiliary air supply, the air flow used for regenerating the at least one air dryer unit is reduced or suppressed.

In order to be able to easily check the state of foreign matter contained in oil regardless of an installation location, a device main body 10 having a housing chamber 11 in which oil is stored, a plug 20 attached to a bottom portion of the housing chamber 11 in a state where an end surface of a shaft portion 20a faces upward, a spacer member 30 formed by a transparent member and arranged on the plug 20 in such a manner that one end surface 30a faces an inside of the housing chamber 11; and an imaging unit 40 arranged on the plug 20, the imaging unit 40 imaging the inside of the housing chamber 11 via the spacer member 30 are provided.