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Chlorine Dioxide Addition
Valves used in this application must be designed for high corrosion and accurate control.

Valves used in this application must be designed for high corrosion and accurate control.

After digestion, end products that are required to be whitened are bleached using chlorine dioxide which preserves pulp strength and provides stable brightness. Modern mills typically have pulp stock enter the oxygen delignification stage before the medium consistency pulp heads to the conventional bleaching sequence. These can vary from four to six separate stages depending on the end-user’s requirements.

A standard mill utilizes a DEOPDED sequence, or an alternating sequence of chlorine dioxide (D), alkaline extraction stages (E), oxygen (O), and peroxide (P) brightening stage. This alternating sequence of chlorine dioxide and alkaline helps to break down the increasingly smaller amounts of residual lignin. Valves used in this application are subjected to high corrosion due to the chlorine dioxide material, and accurate control is necessary to avoid overspending on the high cost chemicals.

Our solution is suited for your application.

The Emerson Fisher™ Vee-Ball™ provides maximum flow control and a modified equal percentage flow characteristic. It offers a long service life, low friction, reduced maintenance, and alloy valve capabilities for high corrosion applications. 

Avoid corrosion of equipment
Choose the right solution for the application
Reduce maintenance requirements

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