Backwash Valves And Controls

The valve controls downstream flow to a pre-set and constant value in order to limit water consumptions and preserve pipeline fill rate or to set a maximum demand value. The valve is controlled by a differential hydraulic pilot that senses the pressure fall generated by water flow into a calibrated orifice.

This valve controls water level in high level reservoirs to avoid overflow, without any external control system like float control etc. The valve remains completely open until the closing input is transmitted by the 3-ways piezometric altitude pilot.

The valve closes totally the pipe line when back flow occurs. The valve is complete with an hydraulic control circuit able to regulate operation’s speed during closing, preventing surge.

The valve controls tanks and reservoirs emptying and avoids overflow. The valve operates by means of a differential hydraulic float complete with regulating levels mounted on the tank side. The float maintains the valve closed and opens only when the minimum pre-set level is reached. Once the valve is open, float allows tank inlet until maximum water level is reached again.