SUMP-VENTED CONTROLLER MECHANISM FOR VACUUM SEWERAGE TRANSPORT SYSTEM

摘要

An apparatus for preventing waterlogging of the sensor and controller valves used to regulate operation of the vacuum interface valve (162) in a sump-vented vacuum sewerage system. A float valve (250) operates in accordance with the sewage level in a sump pit (154) and communicates atmospheric pressure to the sensor and controller valves while the sewage level is below a predetermined limit, but closes passage of sewage therethrough once the sewage level exceeds the predetermined limit. A pressure-relief valve may also be operatively connected to the float valve (250) that vents excessive hydrostatic pressure buildups in the sump pit (154) to the atmosphere.