This fully-flanged non-return valve uses a sinking, rubber-coated ball to prevent backflow while minimizing friction. Its full-bore design resists clogging, even in polluted or debris-laden media. Maintenance is easy thanks to a large clean-out cover. Ideal for water, wastewater systems, power plants, and industrial applications.
DN 50–200
PN 10 / PN 16
According to EN 558 Basic Series 48 (DIN 3202‑F6)
Resilient-seated per EN 12334
Aluminum core, NBR vulcanized, “sinking ball” design
Ductile Iron EN‑GJS‑400‑15 (GGG‑40), epoxy coated internally & externally per GSK guidelines
EN 558-1, Series 1; EN 1092-2 flanged ends
– Municipal and industrial wastewater pipelines
– Power plant cooling systems
– Heavy-duty and polluted water environments
– Retrofit and new systems requiring reliable, low-maintenance non-return functionality
– Suitable for raw water, cooling water, municipal wastewater, weak acids, and alkaline solutions
– Not recommended for media containing solvents or aggressive chemicals that can degrade NBR coating
– No mechanically moving parts = ultra low maintenance
– Full-bore design ensures free flow and minimal pressure drop
– Sinking ball design prevents sediment buildup
– Works under low differential pressure
– Epoxy-coated body ensures corrosion resistance
– Must be installed with flow direction aligned to arrow mark
– Horizontal installation recommended for abrasive or solid-laden fluids
– Requires minimal flow velocity: 1.5 m/s horizontal, 2 m/s vertical for reliable ball displacement
– Upstream straight pipe of at least 5× DN recommended for stable flow
– Regular inspection and cleaning advised; replace ball and cover seal approximately every 5 years
– Larger DN sizes available on request
– Floating ball version available for specific flow conditions
• Body Material: Ductile iron (EN-GJS-400-15) with internal and external epoxy coating.
• Ball Material: NBR-coated or polyurethane depending on medium compatibility and temperature.
• Coating: Fusion-bonded epoxy coating according to DIN 30677-2 and GSK requirements.
• Corrosion Protection: Excellent corrosion resistance for use in aggressive and contaminated media.
• Standards: Coating tested as per GSK guidelines, WRAS approved.
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
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