The valve by the training low valve, balance valve and two check (sewage) valve combination as a whole, with a variety of differential pressure, flow, liquid level transmitters such as supporting the installation, on-or off measurement points, and check on instrument at any time online, checking, calibration or sewage irrigation. Import and export of welding for the installation of over ¢ 14. Check the sewage pipe joints with rubber connection ¢ 8.