De400 KARMAT straight chamber base with backwater valve

The chamber base with a backwater valve for solid wall riser pipe ø 400

Chamber bases with the backwater valve are effective devices for blocking returning waste. Their main advantage is a removable flap valve.
The chamber base with a backwater valve is designed for use in sanitary sewage or rainwater systems. The recommended location for installation is a sewer pipe between the building and the main sewer network. The chamber base also serves as an inspection well protecting the building from flooding. Watertight covers are recommended for use with chamber bases equipped with the backwater valves. They effectively block the returning sewage from spilling over the ground surface. They also prevent bad odours from escaping.

• effective building protection
• low cost and simple installation
• possibility of removal of the flap valve without the need for entering the well
• maintenance by a specialist is unnecessary
• resistance to corrosion, negative temperatures and chemicals

Principle of operation
The phenomenon of sewage backflow causes regression of water into the building and flooding of low-lying areas. It can be caused by intense rainfall, thaw or flood. During normal operation of the chamber with a backwater valve sewage flows freely, lifting the loosely hanging flap of the device. When there is a reverse flow, it is stopped by the flap which securely seals to the head of the backwater valve. This process takes place completely automatically. The flap is fixed to the chromium nickel extension rod with a handle on the end. This enables easy removal of the unit from the well for the purpose of inspection and maintenance. After the inspection we easily put the mobile unit back in its place in the well by means of the rod.