The residual pressure valve comprises a rubber tube (2) which acts as a valve seat and holds the gas control component (1) under tension. The control component has chambers (1H1, 1H2) at each end which are connected by vertical channels (K1A, K1B, K2A, K2B) to control chambers (SA, SB) on its lower side. These are separated by a radial partition (ZW).

A pneumatic valve for use in laminated plastic microfluidic structures. This zero or low dead volume valve allows flow through microfluidic channels for use in mixing, dilution, particulate suspension and other techniques necessary for flow control in analytical devices.

The present invention concerns a means for controlling and/or measuring the flow of a running fluid, wherein the throttling of the flow is controlled utilizing the fluid's own differential pressure arising from the flow. The valve comprises a cover provided with a flow aperture, a main valve disc and control means consisting of a cylinder volume/piston assembly, the movement of said piston being connected to the main valve disc, and wherein the cylinder volume has been connected by a first opening (d1 min ) to the high pressure side and by a second opening (d2 min ) to the low pressure side so that the ratio of the areas of the openings is adjustable. The means comprises at least one sensing member by the aid of which the position of a part of the cylinder volume/piston assembly moving axially in the direction of the flow is measured; a data processing unit, to which the signal from the sensing member is conveyed after appropriate processing; a memory unit, in the first part of which have been stored data concerning the characteristic curve of the valve or equivalent, from which based on the signal from said sensing element, with the aid of the data processing unit, the variations of volumetric flow and or pressure can be calculated, and in the second part of said memory unit being stored the desired values of the volumetric flow and/or pressure, with which the calculated values mentioned before are compared; and at least one actuator by the aid of which the ratio of areas of the openings (d1 min , d2 min ) is adjustable for realizing the desired volumetric flow and/or pressure.

A liquid filter comprises a housing comprising a housing pot having a substantially downwardly open filter element installation opening and a screw-on cover (11) that closes the opening, and a filter element arranged in the housing. The screw-on cover has a drain for residual liquid. A device for opening and closing the drain opening is arranged in the area of the drain. A liquid filter comprises a housing with an inlet and an outlet, comprising a housing pot having a substantially downwardly open filter element installation opening and a screw-on cover (11) that closes the installation opening, and a filter element arranged in the housing sealingly separating the inlet from the outlet. The screw-on cover has a drain for residual liquid present in the housing with a round drain opening (31) arranged in the central axis of the housing. A device for opening and closing the drain opening is arranged in the area of the drain and connected to filter element so that it moves relative to the drain opening and opens the drain when the cover is unscrewed. An independent claim is included for a filter element for a liquid filter.

Device for producing a sterile foam out of a liquid, in particular, a hardening agent comprises a filter system integrated into the gas and/or liquid supply lines.

An airless dispensing pump for liquid products including a push button with a spray nozzle which communicates with a network of channels that is provided locally on the wall of an internal truncated-cone-shaped bore, and a housing. An upper part of the housing includes a dosing cell having an elastically-deformable wall, which is equipped with an intake valve and topped with a rigid collar for fixing same inside the bore of the aforementioned button. Moreover, the outer periphery of the collar has an inclined face which defines a swirl chamber opposite the above-mentioned network, while the inner periphery thereof is quipped with a passage to the chamber.