Vacuum valve controller

Details Vacuum valve controller Vacuum valve controller

2006-03-21

2006-03-21

Lee, Kevin (Department: 3753)

Fluid handling

Diverse fluid containing pressure systems

Liquid filling by evacuating container

C137S907000

Reexamination Certificate

active

07013909

ABSTRACT:
The present invention provides a vacuum valve controller for opening and closing a vacuum valve mounted on an end of a pipe of a vacuum system that is part of a vacuum sewage system. A vacuum valve controller includes a pressure sensor for converting a water level of sewage in a 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 the 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 a suction pipe, and a pressure transmitting mechanism for transmitting a pressure upstream of the vacuum valve in the suction pipe to the open-state holding mechanism to detect when air is drawn in through the suction pipe.

REFERENCES:
patent: 4373838 (1983-02-01), Foreman et al.
patent: 5588458 (1996-12-01), Ushitora et al.
patent: 5871027 (1999-02-01), Shimizu et al.
patent: 02-289730 (1990-11-01), None
patent: 10-60995 (1998-03-01), None
patent: 11-294625 (1999-10-01), None

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