A door drive includes a housing and at least one regulating valve for the adjustable regulation of a fluid flow within the door drive. The one regulating valve or at least one of the several regulating valves includes two ends with respectively one engaging part, in particular for a tool, wherein the one regulating valve or the regulating valves extend/s in such a manner through the housing that the engaging parts for adjusting the one regulating valve or the regulating valves may be manipulated from outside the housing.

Described and illustrated is a regulating valve for a door drive, wherein the regulating valve has an axis of rotation, wherein the regulating valve includes at least two ends and at least two sealing sections, wherein the regulating valve includes a regulating section, and the regulating section is disposed between the sealing sections. A regulating valve for a door drive, which is particularly simply manufacturable, is realized in that at least one radial thickening forms at least one of the sealing sections, wherein at least one radial tapering of the regulating valve forms the regulating section.

This device comprises: a pneumatic cylinder (34), a gas generator (36), a chamber (6, 8) for atmospheric venting, with: an inlet with a connection to the gas generator (36), a first outlet, a second outlet, a valve (16) having a first side (24) and a second side (26) which can change position under the effect of a gas generated by the gas generator and comprising a passage (22) between the two sides (24, 26) obstructed by means which are clearable based on the pressure, where said shuttle-valve (16) is mobile between: a first position allowing connection to the first outlet and the second outlet and isolating the inlet from the first outlet and the second outlet; and a second position allowing connection of the inlet with the first outlet and isolating the second outlet from the inlet and the first outlet.

A wire rope system for supporting an opening movement and a closing movement of a tailgate of a vehicle or a trailer, the wire rope system comprises: a guide cylinder configured to be arranged within a side board wall or within a tailgate of a vehicle or a trailer, and comprising a front end portion with an opening and a back end portion; a compression spring arranged within the guide cylinder, and having a front end and a back end; and a plunger element configured to be movable axially within the guide cylinder; the compression spring being attached with its front end to the front end portion of the guide cylinder and being attached with its back end to the plunger element; a wire rope extending through the opening in the front end portion of the guide cylinder, and comprising a back end attached to the plunger element and a front end to be attached to a tailgate or a side board wall of a vehicle or a trailer; wherein the plunger element comprises a slide membrane element configured such that its circumferential edge abuts to the inner wall of the guide cylinder, thus separating the inner space of the guide cylinder into a back air chamber between the rear side of the slide membrane element and the back end portion of the guide cylinder, and into a front air chamber between the front side of the slide membrane element and the front end portion of the guide cylinder; wherein an air flow regulating opening is arranged within the back air chamber and connects the back air chamber to the exterior side of the guide cylinder; and wherein the slide membrane element is configured such that during movement towards the front end portion of the guide cylinder air flow from the front air chamber between its circumferential edge and the inner wall of the guide cylinder to the back air chamber is blocked or reduced, thus exerting a damping function to the movement of the wire rope and reducing the opening speed of the tailgate.