DRAIN MANIFOLD HEAD Russian patent published in 2016 - IPC E02B11/00 

FIELD: construction; land reclamation.

SUBSTANCE: invention can be used for automatic draining of fluid in wells to ensure uninterrupted operation of drainage systems against freezing of water in them. Drain manifold head comprises header 2, well 3 and protective case 4. In well 3 there is siphon 7 with discharge device 8. Above descending branch 10 of siphon 7 in wall of well 3 there is water outlet 11 with drain tube 12 with seat. Drain tube 12 has calibrated diaphragm 13. Automatic drain valve is arranged inside well 3, secured to its side wall and has arranged bent lever 15 with shutoff element 16, wherein one end of lever 15 is articulated with wall of well 3, and other is bent. Lever 15 is equipped with top load 19 to vary its weight. One end of lever 15 is connected to lower rod 17 of float 18, which is connected with valve 9 with needle via lever (rocker) 22. Well 3 is under thermal protection of local soil and with heat insulation 25. Drain tube 11 by means of bent tube 14 is connected to descending branch 10 of siphon 7 through protective case 4.

EFFECT: increased reliability of automatic drain valve and service life of device.

5 cl, 1 dwg