The invention relates to a filter system comprising a housing and a filter element being accommodated in the housing, wherein a safety assembly is arranged inside the housing, having a blocking mode and an unblocking mode depending on an axial and/or rotational position of the filter element in the housing and being configured to provide access of a sealing structure of the filter element to a sealing area of the safety assembly in the unblocking mode and to block access of the sealing structure to the sealing area in the blocking mode when the sealing structure of the filter element is moved towards the sealing area. The invention further relates to a safety assembly for a filter system and a filter element.

A pleated media pack includes a section of media configured into a tube defining an interior volume and an open opening at one end. A ratio of the pleat depth to a diameter of the opening is greater than 0.2. At least some of the pleats at one end of the media pack are inverted. In some examples, the pleats include major pleats alternating with minor pleats.

[Subject] To provide a novel liquid filter allowed for cleaning of adhered, foreign matter, and reusable after cleaned up,

[Solving Means] A liquid filter has a liquid-receiving space 3d formed at the center; a plurality of ridge parts 3a vertically juxtaposed so as to be exposed individually to the front, back, left side and right side; and a plurality of valley parts 3b each formed on the sides opposite to the individual positions of formation of the ridge parts 3a the liquid filter can be unfolded from a folded state into a rectangular sheet body 5, and the sheet body 5 in the folded state has its left end and right end overlapped.

A filter is provided. The filter comprises a plurality of radial pleats. Each of the plurality of radial pleats comprises a first section in a first plane and a second section in a second plane. Further, the first plane is offset with respect to the second plane.

A fluid filter element has a hollow-cylindrical filter bellows arranged at a central tube with longitudinal axis and can be flowed through by fluid from a radially outward raw fluid side to a radially inward clean fluid side. First and second end disks close off the filter bellows at first and second end faces. The first end disk has an opening with a valve device arranged inside the central tube and openable from the raw fluid side by hydraulic pressure. The valve device has a valve body and a valve cage with a screen arranged thereat. The valve body is movable in the valve cage along the longitudinal axis and forced by a spring against a valve seat of the valve cage. The screen separates the valve device interior from the clean fluid side. The valve cage is arranged at a support body connected to the central tube.

The invention relates to a filter element for fluid filtration, in particular for hydraulic fluid, consisting of element components, such as a preferably pleated and multi-layer filter material (10) that extends between two end caps (26) and at least partially comprises a fluid-permeable supporting tube (14) forming a hollow cylinder, characterized in that at least one element component of the filter element is provided at least partially with at least one luminescent material or another marker in such a manner that said material or marker is excited to a characteristic, detectable wave emission when exposed to a certain exciter wave or wave spectrum.

A filter module for a water dispensing device according to the present disclosure includes a filter housing which has an inflow port and a discharge port, and a plurality of filters which includes a filtration member provided in the filter housing to purify water flowing therein through the inflow port and to supply purified water to the discharge port, and filtering raw water flowing therein from the outside into purified water, and the filter module includes a pre-filter through which raw water passes firstly and in which a first carbon block having a hollow shape is built-in, a hollow fiber membrane (UF membrane) filter through which water passes through the pre-filter passes secondly, a second carbon block having a hollow shape through which water passing through the hollow fiber membrane filter passes thirdly, and an electrostatic adsorption member through which water passing through the second carbon block passes fourthly.

A bellows for a filter element is provided with a flat filter medium that has a first end section and a second end section opposite the first end section. A vulcanizable adhesive material adhesively connects the first end section and the second end section to each other. In a method for producing such a bellows, a vulcanizable adhesive material is supplied and the first and second end sections of the filter medium are connected to each other by vulcanizing the adhesive material.