DEVICE FOR WATER EXTRACTION FROM WELL AND AUTOMATIC DISCHARGE VALVE Russian patent published in 2008 - IPC E03B3/06 E03B7/12 

FIELD: water-supply system, particularly automatic water discharge from pipes, for water-lifting pipe and tower (vessel) protection against water freezing, for well and submersed electric pump protection against operational imperfection, well head protection against mudding and contamination, especially countryside water intake wells.

SUBSTANCE: automatic discharge valve comprises body with inlet and outlet orifices and lever with shutoff member, weight, bolt and nut arranged in the body. One lever part may abut upon inner body surface parts opposite to seat to close shutoff member as pump delivery increases at the time of admissible minimal supply. One lever end is pivotally connected to the body. Another lever end is bent. Valve also has outlet made as discharge pipe provided with seat and connected to side body surface. Valve has fork member. Seat and shutoff member surface touching it are flat. Discharge pipe with seat, lever and fork are made of plastic. Lever has liquid flow divider acting on the weight. In the case of increased pressure upstream of valve the divider is located from low lever side. If said pressure is between high and low values the divider is arranged over weight and space between weight and divider is equal to washer thickness. When said pressure is low lever is provided with additional liquid flow divider arranged over weight and space between weight and divider is equal to washer thickness. Water supply device using said valve is also disclosed.

EFFECT: increased device reliability and extended electric submersible pump operation time, decreased maintenance, construction and well killing costs.

3 cl, 4 dwg