Disco check valves are spring-loaded wafer check valves that prevent backflow in compact pipeline installations. FERGO offers disco check valves in stainless steel 1.4408 (CF8M) or zinc-plated carbon steel 1.0619, from DN15 to DN200, PN6 to PN160, with metallic, EPDM, NBR, FKM or PTFE seat. Face-to-face length to EN 558-1 Series 49 (standard) or Series 52 (high pressure). 213 variants in stock — EU-wide delivery.
A disco check valve — also called a disc check valve, single-plate check valve or wafer check valve — prevents backflow in pipelines. A spring-loaded disc opens only in the flow direction and closes immediately when flow stops or re...
Disco check valves are spring-loaded wafer check valves that prevent backflow in compact pipeline installations. FERGO offers disco check valves in stainless steel 1.4408 (CF8M) or zinc-plated carbon steel 1.0619, from DN15 to DN200, PN6 to PN160, with metallic, EPDM, NBR, FKM or PTFE seat. Face-to-face length to EN 558-1 Series 49 (standard) or Series 52 (high pressure). 213 variants in stock — EU-wide delivery.
A disco check valve — also called a disc check valve, single-plate check valve or wafer check valve — prevents backflow in pipelines. A spring-loaded disc opens only in the flow direction and closes immediately when flow stops or reverses. The compact wafer design saves space and weight compared to full-flanged check valves. Fergo stocks its own ranges (RV100, RV108, RV110) and GESTRA check valves (RK76, RK44, RK86). Use the product configurator above to select size, pressure rating, body and seat material.
What is a disco check valve?
A disco check valve is a backflow preventer in wafer (lug-less) design. A spring-loaded disc inside the body opens under media pressure and closes automatically when flow ceases. The spring ensures fast closure without water hammer. This design is also known as a disc check valve, single-plate check valve or wafer check valve. The face-to-face length to EN 558-1 Series 49 is significantly shorter than a conventional flanged check valve. This saves installation space, weight and cost.
Check valve stainless steel — RV100, RV108 and RV110 ranges
Fergo stocks three in-house disco check valve ranges in stainless steel:
- RV100: standard version, body and disc in stainless steel 1.4408, spring in 1.4436, metallic seat, DN15–DN200, PN6–PN40
- RV108: compact version, body, disc and spring in SS316/CF8M, metallic seat, DN15–DN200, PN16/40 and ANSI 150, operating temperature −20 °C to +200 °C
- RV110: safety version with 4 earthing lugs, body and disc in 1.4408/1.4581, spring in 1.4571, seat in metallic/EPDM/NBR/FKM/PTFE selectable, PN6–PN40 and ANSI 150/300, operating pressure up to 40 bar
All three ranges are wafer check valves to EN 558-1 Series 49. For high-pressure service up to PN160 (ANSI 600/900) Series 52 is available.
GESTRA check valves — RK76, RK44 and RK86
Alongside its own ranges, Fergo stocks GESTRA check valves as wafer check valves. GESTRA (Endress+Hauser) is an established manufacturer of steam and condensate valves. The RK76, RK44 and RK86 models complement the range with specialist variants for steam, condensate and high-pressure duty. The GESTRA series is widely specified in process plants, power generation and chemical engineering.
Wafer check valve — technical data
All disco check valves follow a uniform wafer construction. Key specifications:
- Nominal size: DN15 to DN200 (1/2" to 8")
- Pressure rating: PN6, PN10, PN16, PN25, PN40 (standard), PN63, PN100, PN160 (high pressure)
- ANSI classes: Class 150, Class 300, Class 600, Class 900
- Body: stainless steel 1.4408 (CF8M) or zinc-plated carbon steel 1.0619
- Disc: stainless steel 1.4408
- Spring: stainless steel 1.4571 or 1.4436
- Seat seal: metallic, EPDM, NBR, FKM (Viton) or PTFE
- Face-to-face: EN 558-1 Series 49 (standard), Series 52 (high pressure)
- Temperature range: −20 °C to +200 °C (depending on seal material)
- Conformity:EU Pressure Equipment Directive 2014/68/EU
Seal material — metallic, EPDM, NBR, FKM or PTFE
The seal material determines operating temperature and media compatibility of the wafer check valve:
- Metallic: highest temperature resistance (up to +200 °C), suitable for steam, hot water, thermal oil, gases — no bubble-tight shut-off, but long-lasting and low maintenance
- EPDM: water, air, dilute acids and alkalis, −20 °C to +120 °C — standard choice for water treatment and HVAC
- NBR: mineral oils, fuels, hydraulic fluids, −20 °C to +80 °C
- FKM (Viton): aggressive chemicals, fuels, high temperatures up to +150 °C
- PTFE: universal chemical resistance, food industry, −20 °C to +150 °C
Check media compatibility in advance with our resistance check tool.
Disco check valve vs. swing check valve vs. flanged check valve
| Feature | Disco check valve | Swing check valve | Flanged check valve |
|---|---|---|---|
| Design | wafer (between flanges) | wafer (between flanges) | full-flanged body |
| Closure element | spring-loaded disc | hinged disc (with/without spring) | piston or ball |
| Closing speed | very fast, no water hammer | fast (dual-plate) to medium | slow, water hammer possible |
| Mounting | any position (including vertical) | horizontal preferred | horizontal or vertical |
| Pressure rating | up to PN160 / ANSI 900 | up to PN40 | up to PN40 (standard) |
| Nominal size | DN15–DN200 | DN50–DN600+ | DN15–DN300 |
A disco check valve is the most compact and fastest solution for small to medium nominal sizes. For larger lines from DN250 we recommend swing check valves or dual-plate check valves.
Applications — chemicals, steam, HVAC, oil and gas
A wafer check valve in stainless steel suits a wide range of industrial applications. In the chemical and petrochemical industry, a check valve stainless steel with FKM or PTFE seat protects metering systems and reactors from backflow. In steam and condensate systems, metallic-seated disco check valves secure the line downstream of steam traps. In HVAC systems, EPDM-seated models prevent backflow in heating and cooling circuits. In oil and gas installations, high-pressure versions up to PN160 withstand process pressure. In the food industry, PTFE-seated variants provide hygienic backflow protection.
Disco check valve in stock — EU-wide delivery
Fergo stocks all 213 disco check valve variants for immediate dispatch. Standard shipping via DHL reaches customers across Europe within a few working days. Each wafer check valve ships with datasheet, 3D model download and declaration of conformity to the EU Pressure Equipment Directive. For technical questions or bespoke configurations reach our team directly.
FAQ – Your questions, our answers!
A disc check valve is a non-return valve designed for installation between two flanges (wafer type). A spring-loaded disc inside the valve opens only in the flow direction and closes immediately when the flow decreases or threatens to reverse, thereby preventing backflow.
Spring-loaded means the valve disc is actively held closed by a spring. This enables very fast and secure sealing, independent of the installation position, and ensures reliable operation even at very low differential pressures.
Both the RV108 and RV110 are high-quality disc check valves. A key distinguishing feature of the RV110 is its four grounding lugs, which provide an additional safety function. The RV110 can also typically be configured for a wider range of pressure ratings.
These valves are particularly well-suited for clean liquids and gases. For media containing solids or with a high tendency for fouling, other designs, such as swing check valves, can sometimes be the better choice.