A change-over valve is a valve in which the direction of flow can be changed by operating a handwheel.
The valve has a valve pallet disk Valve pallet disk A valve pallet disk is the moving part in the valve that opens or closes. that is in the middle position during normal operation, so that the flow passes through both sockets of the valve. By closing one of the sockets, maintenance Maintenance Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order. work can be carried out in the relevant part of the system, for example, without interrupting operation.
