A clip filter for a hydraulic valve, the clip filter comprising a carrier frame; and filter elements received in the carrier frame, wherein the carrier frame is configured annular and includes a clip filter lock, wherein a first end of the carrier frame and a second end of the carrier frame are engageable with each other for closing the clip filter, wherein the first end of the carrier frame includes a lug shaped clip element and the second end of the carrier frame includes a recess that is complementary to the lug shaped clip element, and wherein a clip filter lock is configured for a maximized opening force.

A method and device for regeneration of an adsorption air dryer having at least two desiccant-filled drying vessels connected in parallel, wherein a humid compressed-air stream generated by a compressor flows through one of the drying vessels in a drying phase and a dry compressed-air stream flows through the other drying vessel, for the purpose of dewatering the desiccant, in a simultaneous regeneration phase, wherein a valve arrangement is provided for switching the drying vessels alternately between drying phase and regeneration phase during normal operation, wherein the control mechanism are provided for implementing a post-regeneration phase, which control mechanism initiates a further flow through the drying vessel with dry compressed air for complete regeneration and also a flow through the other drying vessel; with dry compressed air for complete regeneration, so that, upon the next start of operation of the adsorption air dryer, operation commences with fully regenerated drying vessels.

A guide element for hydraulic fluid includes a first end surface, a second end surface, and an exterior surface connecting the first end surface to the second end surface. The first end surface includes a first chamfered opening. The second end surface includes a second opening that fluidly communicates with the first opening to define a longitudinal bore that includes a tapered section. The first chamfered opening and the tapered section are configured to guide the hydraulic fluid to facilitate transformation of a turbulent flow of the hydraulic fluid into a laminar flow of the hydraulic fluid.

An air dryer having a heater element associated with its valves to prevent freezing at cold temperatures. The air dryer includes a temperature sensor and an electronic controller that reads the temperature sensor during normal operations and selectively opens and closes certain of the valves when the temperature falls below a predetermined threshold to enter a safe mode that avoids freezing of the valves during operation. If an exhaust valve is open when safe mode is entered, the corresponding inlet valve is closed, both of the exhaust valves are closed, and the other inlet valve if opened. If an exhaust valve is not open, both inlet valves are opened and both exhaust valves are closed.

An object of the present invention is to prevent breakage of a unidirectional filter part for high-pressure oil. A hydraulic device 100 supplies oil to a high-pressure oil channel L1 and a low-pressure oil channel L2 from an oil tank 102 via a supply pump 104. The hydraulic device 100 includes an accumulator 106 capable of accumulating a hydraulic pressure of the oil supplied to the high-pressure oil channel from the supply pump; a filter part 120 disposed between the supply pump and a connection point N1 at which the high-pressure oil channel connects to the accumulator, along a direction in which the oil is supplied; and a check valve 110 capable of preventing a backflow of the oil to the filter part, and disposed between the filter part and the connection point.

A strainer device includes a strainer element; a first lid member that covers an upper opening of the strainer element; a second lid member that covers a lower opening of the strainer element and has a fitting hole in a portion surrounded by the strainer element; a delivery pipe protruding upward inside a hydraulic oil tank in a state in which the delivery pipe is fitted into the fitting hole of the second lid member; and a check valve arranged at the first lid member. The check valve includes a valve main body having a valve passage whose one end opens to the internal space of the strainer element and whose other end opens to inside of the hydraulic oil tank; and a valve body which is arranged to be able to move in a vertical direction with respect to a valve seat provided in the valve passage.

A hydraulic fluid tank arrangement for a working machine is provided, the arrangement including a hydraulic fluid tank; an inlet portion for receiving hydraulic fluid into the hydraulic fluid tank; and an oil filter arranged in fluid communication with the inlet portion; wherein the hydraulic fluid tank arrangement further includes a gas removal device arranged in fluid communication with the oil filter downstream the inlet portion and upstream the oil filter for removing gas from the hydraulic fluid before the hydraulic fluid reaches the oil filter. A method for removing gas from hydraulic fluid contained in a hydraulic fluid tank arrangement is also provided.

A method for estimating water content of brake fluid in a brake system including brake calipers and a brake fluid container, the brake calipers and the container each including a sensor configured to detect a water content of the brake fluid, the method including: arranging the brake system in a controlled environment; for a predetermined time period, exposing the brake system to a controlled temperature and humidity such that an increase in water content in the brake fluid is accelerated; determining the water content of the brake fluid in the brake fluid container and in each brake caliper as a function of time; and based on the determined water content as a function of time, establishing a model describing the relation between the water content of brake fluid in a brake caliper and the water content in the brake fluid in the brake fluid container.

A method for estimating water content of brake fluid in a brake system including brake calipers and a brake fluid container, the brake calipers and the container each including a sensor configured to detect a water content of the brake fluid, the method including: arranging the brake system in a controlled environment; for a predetermined time period, exposing the brake system to a controlled temperature and humidity such that an increase in water content in the brake fluid is accelerated; determining the water content of the brake fluid in the brake fluid container and in each brake caliper as a function of time; and based on the determined water content as a function of time, establishing a model describing the relation between the water content of brake fluid in a brake caliper and the water content in the brake fluid in the brake fluid container.

A working medium circuit for a hydrodynamic machine. The working medium circuit includes a working medium container, an inflow line, an emptying line, and a heat exchanger. The working medium can be moved out of the working medium container into the working chamber for a first operating state, in particular the braking mode, and the working medium can be moved out of the working chamber back into the working medium container for a second operating state, in particular the non-braking mode. For aerating and ventilating, the working chamber is connected at least indirectly via a ventilating line to a chamber which has a ventilating device with respect to the surroundings and in which working medium can collect.