To regulate the overflow by adjusting or discharging.
The Hook Service telescopic valve is used to regulate the flow of sludge from clarifiers. It consists of a double telescopic slip pipe, a driving rod and a handwheel. The double telescopic pipe is stiffened and equipped with concentric gaskets. The driving rod drives the telescopic pipe by means of a screw/nut screw system which flows externally to the lower fixed tube. This avoids any accumulation of residuals in the overlapping area between the fixed and sliding pipe. The control can be manual with handwheel or automatic with actuator.