The butterfly valve function is to control the drainage flow, but its other important function is to adjust and control the height of the water level, control the humidity/density of the foam, and avoid excessive water drainage.
Butterfly valve function is to control drainage flow, but its another important function is to adjust the height of the water level, control the foam is humidity / dense density, avoid excessive discharge of water.
The function of butterfly valve is to control drainage flow, but another important function of butterfly valve is to adjust and control the water level height, and control the humidity/density of foam to avoid discharging excessive water.