GESTRA GESTRA RK41 Non-return valve - Chip check valve PN 16 DN15-200

GESTRA GESTRA RK41 Non-return valve - Chip check valve PN 16 DN15-200

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The GESTRA RK41 is a classic DISCO series non-return valve, also known as a check valve, under the German GESTRA brand (part of the Spirax Sarco Group), designed for industrial piping systems. The valve adopts a compact wafer-type structure for quick flange-to-flange installation and is suitable for liquid, gas and steam media, widely used in HVAC systems, steam pipelines and industrial fluid control. As an imported valve from Germany, the RK41 is known for its reliable backflow prevention and durable materials, ensuring safe and efficient system operation. If you are looking for high-quality GESTRA RK41 check valve specifications and application solutions, this product is the ideal choice.

Product Features and Benefits

  • Compact design and easy installationShort overall length (in accordance with DIN EN 558-1 series 49) with self-centering body and spring mechanism to support installation in any position (horizontal or vertical piping). The large size is equipped with a lifting ring for easy lifting, which improves installation efficiency and reduces costs.
  • high reliability: Spring-assisted opening ensures fast response at low differential pressures and prevents media backflow. Standard opening pressure 7.5-33 mbar, special springs (5-1000 mbar) can be customized to suit specific conditions.
  • Multiple sealing optionsStandard metal-to-metal seals (leakage rate D, EN 12266-1), resistant to high temperatures and pressures; optional EPDM seals (-40°C to 150°C for water/steam, leakage rate A) or FPM seals (-25°C to 200°C for oils/gases, leakage rate A) for different media requirements.
  • Durable materialsSmall sizes (DN 15-100) use CW617N brass body and 1.4571 stainless steel components for corrosion resistance; large sizes (DN 125-200) use 5.1301 gray cast iron body and stainless steel springs to ensure long-term stable operation.
  • Compliance and SecurityComplies with EU Pressure Equipment Directive (PED) 97/23/EC for non-explosive environments. No ATEX requirements, but electrostatic protection is required. EN 10204 test certificate is provided to ensure product quality traceability.
  • Pressure drop optimization: Minimum volume flow design for media such as water (20°C), pressure drop curves refer to official data to ensure efficient fluid transfer.

The strength of the GESTRA RK41 check valve lies in its German-engineered precision and versatility for industrial technology, sanitary applications and steam systems, helping users to reduce maintenance costs and increase system reliability.

technical specification

parameters Specification Details
Nominal Pressure (PN) 6/10/16 (corresponds to ASME Class 125)
Nominal Diameter (DN) 15-200 mm (½-8 inches)
Pressure Temperature Ratings DN 15-100: -10°C to 300°C, max. 16 bar (9.6 bar at 250°C); DN 125-200: -10°C to 300°C, max. 16 bar (9.6 bar at 300°C)
connection method Flange compatible with EN 1092 PN 6/10/16, BS 10 Table D/E/F, ASME B16.1 Class 125 FF, ASME B16.5 Class 150 RF
Size & Weight Length (L): 16-140 mm; Diameter (D): 40-264 mm; Weight: 0.1-20 kg
makings DN 15-100: brass (CW617N) + stainless steel (1.4571/1.4310); DN 125-200: gray cast iron (5.1301) + stainless steel (1.4571/1.4006)
Cracking Pressure With spring: 7.5-33 mbar; without spring: 2.5-11.5 mbar
Application medium Liquids, gases, vapors (not applicable to pulsating flows or compressors)

Refer to the Pressure Drop Chart and Chemical Resistance Table for detailed GESTRA RK41 specifications to ensure a match to your system requirements.

application scenario

The GESTRA RK41 non-return valve is suitable for a variety of industrial scenarios:

  • HVAC and Steam Systems: Prevents condensate backflow and ensures heat exchange efficiency.
  • Industrial Piping: Used in chemical, pharmaceutical and food processing to protect pumps and equipment from backflow damage.
  • Gas and air systems: Combined with FPM seals to provide reliable gas control.
  • sewage treatment: EPDM sealing option for water and condensate media.

When installing the GESTRA RK41 check valve, ensure that the piping is clean and meets minimum flow requirements to maximize performance.

Links to related documents

GESTRA RK41 technical data, official links are provided below:

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