Patent ID: 7013909
Filing Date: 2006-03-21
Classification: E03F,Y10S,Y10T

Abstract:
1. A vacuum valve controller for opening and closing a vacuum valve provided between a suction pipe having an end placed in a sewage pit and a vacuum system for delivering sewage from the sewage pit under vacuum, said vacuum valve controller comprising: a pressure sensor for converting a water level of sewage in the sewage pit into a pressure; a vacuum valve opening and closing mechanism for opening and closing the vacuum valve according to a variation of the pressure detected by said pressure sensor; an open-state holding mechanism for holding the vacuum valve open until air is drawn in through the suction pipe after sewage is drawn in through the suction pipe; a pressure transmitting mechanism for transmitting a pressure upstream of the vacuum valve in the suction pipe to said open-state holding mechanism to detect when air is drawn in through the suction pipe; a transmitting path for transmitting the pressure upstream of the vacuum valve in the suction pipe to said open-state holding mechanism; and a pressure regulating mechanism for introducing external air to regulate the pressure in said transmitting path.