Instead of the usual internal mechanical control circuit and external control drive, the latest generation uses an external proportional valve to adjust the blade position. This has the advantage that the valve can also be replaced during operation without stopping the fan. The hydraulic blade adjustment of this generation has already been on the market for more than 10 years and is used with great success by more than 30 customers on over 80 machines. Through constant dialog with our customers, we have always been able to develop exactly the products that our customers need. Our engineers and technicians have repeatedly demonstrated great innovative strength.