VALVE FOR VACUUM SEWAGE SYSTEM Russian patent published in 2000 - IPC

FIELD: valves designed for washing of vacuum sewage system with water jet. SUBSTANCE: valve includes casing with inlet pipe, through flow section and outlet pipe, and drive for valve opening and closing. Drive is movable body of valve with the first sealing surface slightly inclined to its axis. The first sealing surface extends along valve body periphery up to cylindrical part, and the second sealing surface is vertical relative to direction of flow through valve. The first sealing surface rests on corresponding inclined seat which is located on valve casing protrusion. This seat is found behind the internal wall of through flow section. The second sealing surface tightly rests on corresponding cylindrical upper part of valve casing. EFFECT: simplified design of valve, with compact structure and low cost, featuring prolonged service life. 8 cl, 3 dwg