VALVE AND SYSTEM FOR REMOVAL OF FLUID MEDIUM FROM SETTLING TANK OF SEWAGE HEADER, CONTAINING SUCH VALVE Russian patent published in 2010 - IPC F16K7/07 E03F7/04 

FIELD: construction.

SUBSTANCE: valve (10) comprises flexible pipe (11), having the first and second end parts that determine inlet (13) and outlet (14) holes, accordingly, and rigid body (12) of valve, which surrounds flexible pipe (11). End parts of flexible pipe are tightly joined to body (12) of valve so that closed volume (17) is formed between outer side of flexible pipe and inner side of valve body. In closed volume (17) there is a constant volume of substantially incompressible fluid medium. When pressure at outlet (14) exceeds pressure at the inlet (13), flexible pipe substantially flattens and therefore closes valve or considerably limits the flow. However, when pressure at the inlet exceeds pressure at the outlet, some part of fluid medium is displaced from outlet area in direction to outlet area, and therefore flexible pipe (11) expands in area adjacent to inlet opening, and pipe substantially opens. Flexible pipe is designed so that in normal condition it is closed in one area and may not be closed in the other area. There is a structural version available for valve design, as well as system for removal of fluid medium from settling tank of sewage header, containing such valve.

EFFECT: improved reliability of valve operation.

34 cl, 20 dwg