UNDERGROUND HYDRANT Russian patent published in 2012 - IPC E03B9/08 

FIELD: construction.

SUBSTANCE: underground hydrant comprises a valve (12), a vertically arranged lifting pipe (1) with an upper (2) and a lower (3) flanges and with a bent knee in the lower part of the pipe, an extender (14) of a spindle fixed on a shaft (13) of the valve, a device to connect the lifting pipe to a fire standpipe. In the wall of the lower flange of the pipe at the side of its cavity there is a circular bore. In the cylindrical surface of the bore there is a circular groove. In the circular bore there is a ring with a radially arranged hole. Outside in the wall of the lower flange there is a radially arranged channel formed as communicating with the circular groove. In the channel there is a tube end (16) with a plug (21). The tube is arranged along the external wall of the lifting pipe. The tube is included into a system of liquid removal left in the hydrant cavity. In the upper part of the lifting pipe between the upper flange of the lifting pipe and an additional flange (4) there is a bushing (7) with an external thread. The additional flange fixes the bushing in axial and circumferential directions and is fixed to the upper flange by means of bolts (5). In the idle position of the hydrant, the bushing with the external thread is equipped with a detachable cap (8). The cap is arranged as capable of connection with the additional flange by means of a centrally located captive bolt (9). The captive bolt is screwed into a support element (10) of the upper flange of the pipe, having radial links with holes (11). In the upper part of the detachable cap there is a hole, where a nozzle is fixed with a screwed plug.

EFFECT: invention prevents supply of ground water in a hydrant cavity and its freezing under a negative temperature.

4 cl, 3 dwg