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GESTRA RK41 Non-Return Valve - Wafer Check Valve PN 16 DN15-200

Description

GESTRA RK41 is a classic DISCO series non-return valve from German brand GESTRA, part of Spirax Sarco Group. Also known as a check valve, it is designed for industrial piping systems. The valve features a compact wafer-type design for quick installation between flanges and is suitable for liquid, gas, and steam media. It is widely used in HVAC systems, steam piping, and industrial fluid control applications. As a genuine German-imported valve, RK41 is known for reliable backflow prevention and durable materials, helping ensure safe and efficient system operation. For high-quality GESTRA RK41 check valve specifications and application solutions, this product is an ideal choice.

Features and Benefits

  • Compact design and easy installation: Short overall length compliant with DIN EN 558-1 Series 49, with a self-centering body and spring mechanism for installation in any position, including horizontal or vertical piping. Larger sizes are equipped with lifting eyes for easier handling, improving installation efficiency and reducing costs.

  • High reliability: Spring-assisted opening provides a fast response at low differential pressure and prevents media backflow. Standard opening pressure is 7.5-33 mbar. Special springs from 5-1000 mbar can be customized for specific operating conditions.

  • Multiple sealing options: Standard metal-to-metal sealing provides leakage rate D in accordance with EN 12266-1 and withstands high temperatures and pressures. Optional EPDM sealing is rated from -40°C to 150°C for water and steam applications, with leakage rate A. FPM sealing is rated from -25°C to 200°C for oil and gas applications, also with leakage rate A.

  • Durable materials: Sizes DN 15-100 use CW617N brass bodies and 1.4571 stainless steel components for strong corrosion resistance. Sizes DN 125-200 use 5.1301 grey cast iron bodies and stainless steel springs for long-term operating stability.

  • Compliance and safety: Complies with the European Pressure Equipment Directive (PED) 97/23/EC and is suitable for non-explosive environments. No ATEX requirement applies, but electrostatic protection should be considered. EN 10204 inspection certificates are available to support product quality traceability.

  • Optimized pressure drop: Designed for minimum volumetric flow requirements with media such as water at 20°C. Pressure drop curves can be referenced in official documentation to support efficient fluid transfer.

GESTRA RK41 check valve combines German engineering precision with versatility for industrial technology, sanitary applications, and steam systems. It helps reduce maintenance costs and improve overall system reliability.

Technical Specifications

ParameterSpecification
Nominal pressure (PN)6/10/16 (corresponding to ASME Class 125)
Nominal diameter (DN)15-200 mm (½-8 inches)
Pressure-temperature ratingDN 15-100: -10°C to 300°C, maximum 16 bar (9.6 bar at 250°C); DN 125-200: -10°C to 300°C, maximum 16 bar (9.6 bar at 300°C)
Connection compatibilityFlange-compatible with EN 1092 PN 6/10/16, BS 10 Table D/E/F, ASME B16.1 Class 125 FF, and ASME B16.5 Class 150 RF
Dimensions and weightLength (L): 16-140 mm; diameter (D): 40-264 mm; weight: 0.1-20 kg
MaterialsDN 15-100: brass (CW617N) + stainless steel (1.4571/1.4310); DN 125-200: grey cast iron (5.1301) + stainless steel (1.4571/1.4006)
Opening pressureWith spring: 7.5-33 mbar; without spring: 2.5-11.5 mbar
Applications mediaLiquids, gases, and steam (not suitable for pulsating flow or compressors)

For detailed GESTRA RK41 specifications, refer to the pressure drop diagrams and chemical resistance table to ensure compatibility with your system requirements.

Applications

GESTRA RK41 non-return valve is suitable for a wide range of industrial applications:

  • HVAC and steam systems: Prevents condensate backflow and helps maintain heat exchanger efficiency.

  • Industrial piping: Used in chemical, pharmaceutical, and food processing applications to protect pumps and equipment from backflow damage.

  • Gas and air systems: Combined with FPM sealing, it provides reliable gas control.

  • Water treatment: The EPDM sealing option is suitable for water and condensate media.

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

Technical documentation for GESTRA RK41 is available through the official links below:

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