Valve for aeration and de-aeration DV891

• Valves for the aeration of the tanks

• PVC, PP and PVDF materials

• Diameters from DN15 to DN80

• PTFE Ball

• FPM Joints

• With HATELLOY spring or without spring

• Welded or flanged connections

Features

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• High operational reliability and long service life • Low maintenance requirements • Simple connection of the valve to the pipeline by the tried and tested gluing or welding process Applications

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• Chemical plant construction • Water treatment Use

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• For the aeration and deaeration of industrial plants Function

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• If liquid is withdrawn from the vessel, the valve ball / float is located at the bottom of the valve. Air / protective gas can enter the vessel and thus ensure pressure compensation. The vessel is not damaged by vacuum. • When the vessel is filled, the air/protective gas is vented through the valve to the atmosphere until the liquid level reaches the valve ball/float. Further filling of the valve ball / float floats with the liquid level and obstructs the vessel at the valve seat. Indication

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• In the closed state, venting is possible despite the accumulation of air (gaseous fluids) only if the pressure in the vessel is lower than atmospheric pressure. • The valves are not suitable for media that impair the opening or closing of the ball/float due to deposits or adhesion. Fluids

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• Neutral or aggressive, technically pure, liquid or gaseous fluids or gases, if the valve components in contact with the fluids are resistant to the operating temperature according to the Divatec resistance list