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Industriearmaturen Disc Check Valves

Disc Check Valves — Spring-Loaded Disco Design in Stainless Steel

Disc check valves — Fergo’s disco range — in stainless steel 1.4408 or chrome steel with EPDM or metallic seat, wafer style, DN15 to DN200, PN6 to PN40, ANSI 150/300.

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Disc Check Valves
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Disc Check Valves: Compact Spring-Loaded Backflow Prevention

A disc check valve — often listed in European catalogues as a disco check valve or a silent disc check valve — uses an axial disc that travels along the flow direction against a return spring. Forward flow lifts the disc off its seat and passes through the annular gap; as soon as the flow drops below the spring force, the disc returns to the seat before backflow can develop. Consequently, the axial-disc design closes far faster than a hinged flap, prevents water hammer at the pump discharge, and produces the acknowledged silent check-valve behaviour that gives the family its European nickname.

Fergo supplies the RV110 and RV108 series with a body and disc in stainless steel 1.4408 / 1.4581 (or SS316 / CF8M) and a return spring in stainless steel 1.4571. The seat is either EPDM for water and dilute chemicals or a metallic contact for steam, hot water and process gases. The GESTRA RK 86 variant carries a chrome steel body in 1.4317 with the same 1.4571 disc and spring — a design intended for high-temperature process duty. Sizes cover DN15 to DN200, pressure ratings run from PN6 up to PN40 and ANSI Class 150 or Class 300, and the face-to-face length follows EN 558-1 Series 49 — the shortest wafer face-to-face in the check-valve family.

Disc check valves protect pumps, compressors, heat exchangers and pressure vessels across water supply, HVAC circuits, chemical dosing, steam service, oil and gas processing and food and beverage production. Because every RV110 ships with 4 earthing lugs for electrical bonding, the design is directly suitable for ATEX-zoned installations that require continuity of the earth path between counter-flanges. For larger nominal sizes or lower cracking pressures, the wafer and dual plate check valve ranges take over from DN25 upwards, and for small-bore utility branches the threaded check valve range covers 1/4 inch to 4 inch.

Subcategories: Disc Check Valves by Seat and Body Material

01 RV110 — Disc Check Valve with EPDM Seat (Stainless Steel)

The RV110 disco check valve with EPDM seat combines a stainless steel 1.4408 / 1.4581 body and disc, a stainless steel 1.4571 return spring and an EPDM seat ring. Sizes span DN15 to DN200 at PN6, PN10, PN16, PN25 and PN40, with additional flange drilling to ANSI Class 150 and Class 300. Four earthing lugs bond the valve to both counter-flanges. The EPDM seat suits water supply, HVAC circuits, dilute acids and alkalis, water treatment and drinking water networks up to +120 °C. This variant is the choice where a soft-seated bubble-tight shut-off is required.

02 RV110 — Disc Check Valve with Metallic Seat (Stainless Steel)

The RV110 disc check valve with metallic seat shares the same stainless steel body, disc and spring but replaces the EPDM seat with a metal-to-metal sealing surface. Sizes and pressure ratings match the EPDM variant. The metal seat handles steam, hot water above 120 °C, thermal oil and process gases that would age an elastomer seat quickly. Typical service includes small-bore steam lines, condensate return, thermal oil circuits and pump discharge in refineries and chemical plants. Bi-directional metallic sealing is retained across the full wafer face-to-face length to EN 558-1 Series 49.

03 GESTRA RK 86 — Chrome Steel Disc Check Valve

The GESTRA RK 86 disco check valve uses a chrome steel body in 1.4317 with a disc and spring in stainless steel 1.4571 and a metallic seat. This design targets high-temperature process duty in steam, hot water and thermal oil systems, and is available for DN40 up to DN200 at PN10, PN16, PN25 and PN40 as well as ANSI Class 150 and Class 300. The chrome steel body offers higher creep resistance than austenitic stainless steel at elevated temperatures, so the RK 86 is often specified in power stations, district heating plants and refinery utility lines.

Materials in Detail: Specifying the Right Disc Check Valve

Body and Disc Materials

1. Stainless Steel 1.4408 / 1.4581 / CF8M / SS316 (RV110, RV108)

Application: chemical processing, food and beverage plants, water treatment, marine and offshore installations, chlorinated water, HVAC and district heating — the standard body and disc material across the RV110 and RV108 series

Temperature: up to +200 °C with a metallic seat · PN6 to PN40 · ANSI Class 150/300

Advantages: molybdenum content resists pitting and crevice corrosion, no metal-ion pickup into the medium, hygienic surface suits CIP and SIP processes, dimensionally stable under repeated spring-cycle loading

Limitations: higher material cost than carbon steel; not resistant to hydrofluoric acid or strongly reducing media

2. Chrome Steel 1.4317 (GESTRA RK 86)

Application: steam service, hot water, thermal oil, high-temperature process gases in power generation, district heating and refinery utilities

Temperature: up to the material creep limit — well above the range of standard austenitic stainless steel

Advantages: higher creep strength than 1.4408 at elevated temperatures, proven martensitic-chromium grade for steam and thermal duty, retains dimensional stability across sustained hot-cold cycles

Limitations: lower corrosion resistance than 1.4408 in chloride-rich media; specify only where the thermal duty genuinely justifies the chromium grade

Spring Material

1. Stainless Steel 1.4571 Spring (RV110, RV108, GESTRA RK 86)

Application: return spring across every disc check valve variant, whether the body is 1.4408, CF8M or 1.4317

Temperature: matches the seat and body envelope

Advantages: titanium-stabilised 1.4571 resists chloride-induced stress corrosion cracking, so the spring keeps its rate over long service; corrosion-resistant against the same media as the body; consistent cracking pressure over thousands of cycles

Limitations: adds a defined cracking pressure to the differential-pressure requirement — factor into pump-sizing at very low flow

Certificates & Standards for Disc Check Valves

Fergo disc check valves comply with the Pressure Equipment Directive 2014/68/EU and carry the CE mark. Flange drilling follows DIN EN 1092-1 for the European standard and ASME B16.5 Class 150 or Class 300 for inch-based pipework. The wafer face-to-face length complies with EN 558-1 Series 49, which is the shortest series in the check-valve family — this makes the disc check valve the compact alternative to conventional wafer designs where installation length is limited. The four earthing lugs provide electrical continuity between the two counter-flanges, so the disc check valve fulfils the bonding requirement for ATEX-zoned installations.

Spring-loaded axial-disc check valves fall within the scope of MSS SP-125, the US industry standard for silent check valves that specifies design, materials and testing requirements for spring-actuated backflow prevention. The GESTRA RK 86 variant is manufactured to the same silent-close principle but with a chrome steel body specifically for high-temperature service. Inspection documents to EN 10204 — the type 2.2 works certificate or the type 3.1 inspection certificate — are available on request. A full overview of all certificates is published on the Fergo certificate page. You can verify seat and body compatibility with your medium beforehand using the Fergo resistance check.

Delivery & Availability

Fergo holds more than 25,000 industrial valves in stock. Disc check valves in the RV110 and RV108 stainless steel series and the GESTRA RK 86 chrome steel series are available in every common nominal size from DN15 to DN200, in every pressure rating up to PN40 and Class 300, and with both EPDM and metallic seats. Because the wafer face-to-face length follows EN 558-1 Series 49 — the shortest series in the check-valve family — the disc check valve replaces bulkier check valves in tight pipework installations without any modification to the counter-flanges. Orders are picked the same working day.

Fergo ships across Europe — including the United Kingdom, the Nordic countries and all other EU member states. Smaller disc check valves travel by parcel service, while larger sizes and consolidated shipments go by forwarding agent. Express shipping delivers within the next working days. You will find shipping costs, payment options and express terms on the shipping and payment terms page. For special alloys, hastelloy or titanium bodies, non-standard cracking pressures or complete pump-discharge packages, please contact us through the customised solutions section.