A change-over valve is a valve in which the direction of flow can be changed by operating a handwheel.
The Pressure/vacuum relief valve Pressure/vacuum relief valve is an umbrella term that includes pressure or vacuum relief valve as well as pressure and vacuum relief valve. 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.
