Every process is unique – that’s why we offer several backwashing/tubular systems in several configurations.
The only multi-element, single-housing filter in the backwashing/tubular family, the VWS-Series offers high-flow capability and is well-suited to code applications. Filter elements are arranged in a circular pattern within a single large housing. At the center of the system is a rotating washing arm. When an element requires cleaning, the washing arm rotates to that element. Much like the AFR-Series, when the drain valve is opened to atmosphere, a vacuum condition occurs, and the position pressure of the unit forces clean process liquid backward through the media and flushes contaminants.
VWS-Series – high flow with a single vessel
The VWS-Series is perfect for high-flow applications on water-like liquids – up to 22,000 gpm (4,997 m3/hr) – including surface water straining or injection water for drilling applications. Its unique multi-element, single-housing design makes it ideal for code applications and those requiring specialized materials and coatings. Backwashing is based on differential pressure, to minimize unnecessary element cleaning.
Additional Choices of Media Material Configuration
VWS-Series filter media is offered with a wide range of retentions.
Cake Formation Increases Operational Efficiency
While the filtration media provides some of the filtration action, collected contaminants actually further increase efficiency. We call this phenomenon “cake formation.” The collected solids (or “cake”) trap additional contaminants. The key to making this principle work is timely cleaning – too soon and you lose the benefit, too late and the system flow becomes hindered.
Ronningen-Petter systems come factory pre-set to backwash when the differential pressure from inlet to outlet reaches 15 psi (1 bar) – typically the optimum time to initiate backwashing, although this is adjustable.