vorgesteuerte Druck- / Unterdruckventil

The 9800 series pilot operated valves have two principal advantages over other types of relief valve: it is bubble tight to set pressure. And the full flow is attained at no more than 10% over-pressure. These characteristics permit an operating pressure nearer to the maximum allowable working pressure of the tank. High operating pressures reduce evaporation and total venting volume, thereby reducing product loss and cost of processing emissions.