Water Treatment sector

Specialised components for wastewater treatment, drinking water purification, desalination and industrial effluent plants. Corrosion-resistant valves, pumps and fittings for every stage of the water cycle.

A strategic sector for environment and industry

Water treatment is essential both for environmental protection and industrial processes. From municipal wastewater treatment plants managed by water utilities, to industrial effluent treatment systems in manufacturing facilities, to drinking water purification and desalination: every application requires reliable, corrosion-resistant components.

Roffia supports water utilities, contractors and machine builders with a complete range of valves, pumps, fittings and accessories specifically designed for the water sector.

Water treatment challenges

Water treatment plants operate with aggressive fluids (chlorine, acids, bases), suspended solids (sludge, sand), and variable operating conditions. Components must ensure corrosion resistance, sealing on solids-laden fluids and long service life with minimal maintenance. Selecting the right materials — stainless steel, coated iron, plastics — is fundamental for plant reliability.

Products for water treatment

Gate valves

Gate valves with rubber-seated wedge for raw water, sludge and sewage isolation. GGG50 ductile iron body with epoxy coating compliant with EN 14901. Available with handwheel, gearbox or motorised. DN 50 - DN 600.

Butterfly valves

Butterfly valves wafer and lug type for flow regulation and isolation. Disc in nickel-plated iron, stainless steel or PTFE-coated. WAFER or LUG body with ISO/DIN/ANSI drilling. EPDM, NBR or PTFE seat. Suitable for water, sludge and process air.

Diaphragm valves

Diaphragm valves for solids-laden fluids and sludge. The flexible diaphragm completely isolates the mechanism from the fluid, preventing blockages. Body in lined cast iron or plastic (PVC, PP, PVDF). Ideal for chemical dosing and sludge lines.

Plastic valves for chemical dosing

Ball valves and diaphragm valves in PVC-U, PP and PVDF for chemical dosing lines: hypochlorite, ferric chloride, sulphuric acid, caustic soda, polyelectrolyte. Brands: FIP, Effebi.

Submersible and centrifugal pumps

Submersible pumps for sewage lifting and tank emptying, centrifugal pumps for recirculation and transfer. Brands: KSB, Ebara. Open or channel impellers for solids-laden fluids.

Check valves

Check valves — swing, disc, ball and dual-plate types — for pump protection and backflow prevention. Essential in pumping stations to prevent water hammer and backflow when pumps stop.

Fittings and flanges

Fittings in stainless steel, cast iron and plastic. EN 1092-1 flanges in coated iron and stainless steel for flanged connections. EPDM and PTFE gaskets for aggressive fluid sealing.

Instrumentation

Pressure gauges, pressure switches, thermometers and level indicators for plant parameter monitoring. Stainless steel versions and with diaphragm seals for aggressive fluids.

Applications in the water cycle

Drinking water

Filtration, disinfection, chlorination. Plastic and stainless steel valves certified for potable water.

Municipal wastewater

Screening, sedimentation, biological treatment, disinfection. Valves for sludge and sewage.

Industrial effluent

Process water treatment, neutralisation, specific pollutant removal.

Desalination

Reverse osmosis, evaporation. Super duplex stainless steel and plastic valves for seawater.

Standards and certifications

EN 12873

Drinking water materials

EN 14901

Epoxy coatings

EN 1074

Water supply valves

WRAS / NSF 61

Potable water approval

Domande frequenti

What valves are used in wastewater treatment plants?
The most common valves are: gate valves with rubber-seated wedge for sludge and sewage isolation, butterfly valves (wafer and lug) for flow regulation, check valves (swing, ball, dual-plate) for pump protection, diaphragm valves for solids-laden fluids, and plastic ball valves (PVC/PP) for chemical dosing lines. Selection depends on fluid type (raw water, sludge, leachate) and operating conditions.
What materials resist corrosion in water treatment applications?
The most commonly used materials are: AISI 316/316L stainless steel for chlorinated and seawater applications, coated ductile iron (epoxy or rubber-lined) for sludge and sewage, PVC, PP and PVDF for chemical dosing lines. For chlorine and hypochlorite service, plastic valves or austenitic stainless steel are preferred. EPDM and PTFE seals offer excellent chemical resistance.
Does Roffia supply components for wastewater treatment plants?
Yes. Roffia supplies valves, pumps, fittings and accessories for municipal and industrial wastewater treatment, water purification, desalination and industrial effluent treatment. We serve water utilities, contractors and machine builders throughout Italy and Europe with fast delivery from our Cremona warehouse.
What pumps are needed for a wastewater treatment plant?
The most commonly used pumps are: submersible pumps for sewage lifting and tank emptying, centrifugal pumps for sludge recirculation and water transfer, metering pumps (diaphragm type) for chemical dosing (ferric chloride, polyelectrolyte, hypochlorite). KSB and Ebara are the leading brands we distribute.
How to select valves for chemical dosing lines?
For chemical dosing (hypochlorite, acids, bases, polyelectrolyte) use plastic valves (PVC-U, PP, PVDF) with PTFE or EPDM seals. Ball valves and diaphragm valves are most suitable. For highly aggressive fluids (sulphuric acid, concentrated caustic soda) PVDF is the preferred material. FIP and Effebi are the plastic valve brands we carry.
What standards apply to drinking water valves?
Valves in contact with drinking water must comply with EN 12873 (European) and national regulations such as WRAS (UK), ACS (France), KTW (Germany) and NSF 61 (USA). Materials must be certified for drinking water contact and not release harmful substances. Socla and other brands we distribute offer drinking water approved valves.

Working in the water sector?

Contact us with your plant specifications: water type, flow rates, pressures, chemicals used. We support you from component selection to delivery.

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