Patent ID: 6467494
Filing Date: 2002-10-22
Classification: E03F,Y10S,Y10T

Abstract:
An arrangement in a vacuum sewer system comprising: a sump for collection of wastewater; an interface valve for evacuation of wastewater from the sump; a pneumatic controller to control opening and closing of the interface valve, the pneumatic controller being pneumatically connected to atmospheric air through a breather line, to a vacuum source and to the interface valve, the arrangement preventing entrance of water into the controller through the breather line, the pneumatic controller including means preventing any open connection from the breather through the controller line to the vacuum source thus preventing continuous flow of atmospheric air from the breather line and the controller to the vacuum source, the means preventing open connection include a control chamber and a control valve, the control valve switching between a first and a second position, in its first position closing a first connection between the control chamber and the vacuum source, and in its second position closing a second connection between the control chamber and the breather line.