VALVULA DE CIERRE DE CORREDERA

摘要

For the delivery of water at a number of points in branched pipeline systems, especially for irrigation purposes, a sliding stop- cock is used, which responds reliably to hydraulic control signals, irrespective of their formation speed, and in which stop-cock there are no restrictor openings which can become blocked, so that there is no need to clean the water used for irrigation. For this purpose, the sliding stop-cock has a slide (2), mounted on a branch (1) of the pipeline, a cylinder (3) having a piston (4) and a programming device (5) positioned on one side, and which stop-cock is connected to a reservoir (9) for water and air. In a part (11) of the cylinder (3) which is extended towards the branch (1) of the pipeline, there are longitudinal channels (12) constructed over the length of the slide (2) on the side of the inlet opening (10) of the branch (1) of the pipeline. The slide (2) has a cavity (13), in which a head (14) is freely arranged, the head (14) being connected via a rod (15) to the piston (4) which is guided in the cylinder (3). The cavity (13) is connected to an intermediate slide chamber (17) via an opening (31) on the one side, and the cylinder (3) is connected to the intermediate slide chamber (17) via a first axial opening (16) in the base on the slide side. Around the surface of the cylinder (3) there are four rows of openings (18, 19, 20, 21), the two rows of which openings (18, 19) on the slide side are surrounded by a first annular outer chamber (22), while the two rows of openings (20, 21) on the programming device side are surrounded by a second annular outer chamber (23) which, for its part, is connected via an opening (24) to the reservoir (9) for the water and air. The second (19) and third (20) rows of openings are covered externally with elastic rings (25, 26). In the base on the programming device side of the cylinder (3) there is a second axial opening (27) through which a rod (28) projects with its end that is connected fixedly to the piston (4), on the other end of which rod (28) there is mounted transversely thereto a mandrel (28), which can rotate freely about the rod, whose outer end engages in the short and long programming channels (6, 7) of the programming device (5).