Switch-over valve, preferably for an air drier

摘要

A switch-over valve for directing a compressed air flow to either one of two drying towers of an air drier, the other one being vented to the atmosphere. The valve is arranged in a partition wall between the two towers, a conduit to the valve being provided in the partition wall. A valve body is axially movable in a cavity in the wall between two positions sealing off either one of the outlets from the cavity and keeping the other one open. A control piston with a greater length than the valve body is axially movable in a bore in the valve body and is biased towards a neutral position by spring means.