Nozzles & Distribution Systems
Derwent Water Systems provides a variety of filter nozzles for water processing, water clarification and cleaning. The nozzles are of varying configurations and of different designs, e.g. stars with varying numbers of arms, fishbone, hub-and-lateral design. They are designed to fit varying-sized vessels.
Base-exchange softening vessels utilise simple top-mounted filters and bottom hub-and-lateral distributors for both high and low flow, whereas a more complex iron/manganese filter vessel will often have a purpose-designed bottom distribution system to suit particle size, flows and pressure.
Varying filter slot sizes can be selected to suit type and size of particles being supported or removed. For simplification, there are three categories of nozzles/distribution systems supplied by Derwent Water Systems:
Composite Pressure Vessel – Standard Filter Nozzles
There are standard filter nozzle systems which fit the standard composite pressure vessels supplied by Derwent Water Systems, i.e. nozzles specific for 4″ threaded vessels, 6″ threaded vessels, 6″ flanged vessels, and top and bottom vessels.
More complex filters with large steel vessels will often have a purpose-designed bottom distribution system to suit particle size, flows and pressure.
Typically, there are filter nozzles for standard softeners, filter nozzles for mixed-bed systems, counter-flow valves for uniform distribution of regenerants, filter nozzles for filter bases, supported by and in contact with sand/gravel filter media.
Normal materials of construction for filter nozzles and stars are polypropylene. For more stringent temperature conditions, polypropylene combined with glass fibres could be recommended. For large hub-and-lateral distributors and collector systems in sand filters, these would typically be constructed from ABS and polypropylene.