DUPLEX 1865/F73A ion-exchange unit

The DUPLEX ion-exchange unit consists of two housings connected in parallel. One of them is always filtering, while the other is in regeneration or standby; when the resin bed in the operating housing is exhausted, the second one takes over. This keeps softening continuous and holds the specified capacity without stopping to restore the resin bed — something a single unit cannot provide.

The purification principle is the same as in single-vessel ion-exchange schemes: water passes through a resin bed, and the ions dissolved in it are replaced by ions released by the resin; by selecting the resin, the task can range from softening and decarbonization to partial or full desalination. The unit is built on Runxin valves in the TWIN design, rated for controlling two housings at once.

Design 1865/F73A: 18×65″ housing, automatic Runxin F73A valve for two housings (TWIN), up to 3.5 m³/h, 1" connection, top mounting. The valve is designed for softening — regeneration of the ion-exchange resin bed with a reagent solution. Weight 85.614 kg.

Configuration within the line: vessel size 1865 (18×65″) with control valve Runxin F73A. On the same vessel size 1865 (18×65″) the line also offers Runxin F135A and Runxin F88A. The same control valve Runxin F73A is fitted on 0835, 1054, 0844, 1252 and others.

On vessel size 1865 the closest alternatives to Runxin F73A are Runxin F135A (valve capacity up to 10 m³/h instead of up to 3.5 m³/h, connection 1 1/2" instead of 1", weight 94.6 kg instead of 85.614 kg) and Runxin F88A (valve capacity up to 10 m³/h instead of up to 3.5 m³/h, valve mounting side instead of top, weight 100.7 kg instead of 85.614 kg).