Pressure reducing device for reducing pressure in a fluid, in particular a liquid such as water, in an irrigation device, comprising: a) at least one passage element for passage of the fluid between at least one inlet orifice and at least one outlet orifice, b) at least one orifice element and c) at least one resilient element, d) wherein the passage element and the orifice element are movable relative to each other in such a way, that, preferably in a feedback-loop, the inlet orifice is decreased by moving the passage element and the orifice element towards each other in a decrease movement when the pressure of the fluid is in a first pressure range and/or equal to or above a given pressure threshold, and that the inlet orifice is increased by moving the passage element and the orifice element away from each other in an increase movement, when the pressure of the fluid is in a second pressure range below the first pressure range and/or below the pressure threshold, e) wherein the at least one resilient element supports or causes with its resilient force, in particular upon stretching or compressing deformation, the increase movement between the passage element and the orifice element, f) wherein at least one resilient element is formed as a first bellows having several folds, g) wherein an interior space of the first bellows forms a passage for the fluid, the folds forming a closed or sealing wall or casing of the interior space impermeable for the fluid, h) wherein the first bellows is mechanically connected with the passage element or is mechanically connected with the orifice element or forms at least a part of the passage element, i) wherein the pressure reducing device further comprises at least one rigid element for supporting the orifice element, the passage element and the resilient element or first bellows and a second bellows, characterized in that ii) the pressure reducing device is formed integrally and/or in one single piece and is produced simultaneously in one forming process, j) wherein the folds of the first bellows and in particular the second bellows are helically arranged or formed, k) and wherein the at least one resilient element and the passage element are made of an elastic plastics material in a plastics molding process. a) at least one passage element for passage of the fluid between at least one inlet orifice and at least one outlet orifice, b) at least one orifice element and c) at least one resilient element, d) wherein the passage element and the orifice element are movable relative to each other in such a way, that, preferably in a feedback-loop, the inlet orifice is decreased by moving the passage element and the orifice element towards each other in a decrease movement when the pressure of the fluid is in a first pressure range and/or equal to or above a given pressure threshold, and that the inlet orifice is increased by moving the passage element and the orifice element away from each other in an increase movement, when the pressure of the fluid is in a second pressure range below the first pressure range and/or below the pressure threshold, e) wherein the at least one resilient element supports or causes with its resilient force, in particular upon stretching or compressing deformation, the increase movement between the passage element and the orifice element, f) wherein at least one resilient element is formed as a first bellows having several folds, g) wherein an interior space of the first bellows forms a passage for the fluid, the folds forming a closed or sealing wall or casing of the interior space impermeable for the fluid, h) wherein the first bellows is mechanically connected with the passage element or is mechanically connected with the orifice element or forms at least a part of the passage element, i) wherein the pressure reducing device further comprises at least one rigid element for supporting the orifice element, the passage element and the resilient element or first bellows and a second bellows, characterized in that ii) the pressure reducing device is formed integrally and/or in one single piece and is produced simultaneously in one forming process, j) wherein the folds of the first bellows and in particular the second bellows are helically arranged or formed, k) and wherein the at least one resilient element and the passage element are made of an elastic plastics material in a plastics molding process.