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GESTRA RK71 wafer check valve, brass non-return valve

Description

GESTRA RK71 non-return valve is a classic DISCO® series product from Germany-based GESTRA, designed for industrial piping systems and reliable backflow protection. This high-quality brass check valve is suitable for PN6-16 pressure ratings and DN15-100 sizes, ensuring unidirectional flow of liquids, gases, and steam. GESTRA RK71 check valve is known for its compact design and durable materials, and is widely used in heating, HVAC, and compressed-air systems.

Product Specifications and Technical Parameters

GESTRA RK71 non-return valve features a wafer-style design for easy installation between flanges and complies with international standards. Detailed specifications are provided below:

  • Nominal pressure (PN): 6/10/16 barg.

  • Nominal diameter (DN): 15-100 mm (equivalent to 1/2” - 4”).

  • Temperature range: -60°C to 250°C (depending on pressure and medium; maximum 100°C for standard heating applications).

  • Cracking pressure: 10-18 mbar for spring-loaded versions and 2.5-6.5 mbar for non-spring versions (depending on DN size).

  • Dimensions and weight (examples):

DN 15: length 16 mm, diameter 40 mm, weight 0.09 kg.

  • DN 50: length 40 mm, diameter 95 mm, weight 1.05 kg.

  • DN 100: length 60 mm, diameter 152 mm, weight 3.2 kg.

  • Flange connection standards: DIN/EN BS EN 1092-1 (Form B1), BS 10 Table D/E/F.

  • Pressure-temperature ratings (RK71 PN16 CW617N example):

Temperature (°C)20120200250
Pressure (barg)16161413

Overall length of GESTRA RK71 check valve complies with EN 558-1 Series 49. Its ultra-short design reduces installation space requirements. For additional technical details, refer to the official data sheet PDF.

Materials and Design Features

GESTRA RK71 non-return valve uses high-quality materials to ensure corrosion resistance and long service life:

  • Body, seat ring, and guide ribs: Hot-pressed CW617N brass (equivalent to ASTM C38000), offering strong corrosion resistance for non-hazardous media.

  • Disc, spring, and fasteners: 1.4571 austenitic stainless steel (equivalent to AISI 316 Ti), providing metal-to-metal sealing. Optional EPDM, FPM, or PTFE soft seals are available for water, steam, mineral oil, or corrosive media.

  • Other components: Spring retainer and centering ring are made of stainless steel for stable operation.

Key features include:

  • Spring-assisted design: Allows installation in any position, including horizontal, vertical, or inclined orientations. Non-spring versions are limited to vertically upward flow.

  • Low pressure drop and low noise: Four guide ribs reduce wear and optimize fluid flow.

  • Compact and lightweight: Significantly lighter than conventional valves, reducing installation costs.

  • Standards compliance: Passes DIN EN 12266-1 leakage testing and is certified under PED 97/23/EC for Fluid Group 2 media. It has no inherent ignition source and can be used around Ex zones; see the ATEX declaration for details.

  • Antistatic option: An antistatic connection can be added as a customization option.

These features make GESTRA RK71 brass check valve a strong choice for industrial applications while reducing maintenance requirements. For chemical resistance details, consult GESTRA technical support.

Applications and Benefits

GESTRA RK71 non-return valve is widely used in industrial applications to ensure safe and efficient system operation:

  • Heating and HVAC systems: Prevents reverse flow of hot water or steam and is suitable for compressed-air and ventilation piping.

  • Steam and condensate systems: Provides reverse-operation protection in parallel pump arrangements.

  • Industrial piping: Provides unidirectional control for liquids, gases, and steam, preventing backflow contamination or equipment damage.

  • Other applications: Compressed-air systems, sanitary engineering, and air-conditioning technology.

Benefits:

  • High reliability: Metal sealing ensures tight shutoff, while soft-seal options improve the leakage rate to Class A.

  • Cost-effective operation: Low installation costs and low pressure drop help reduce energy consumption.

  • Easy maintenance: Compact design simplifies removal and replacement.

For minimum volumetric flow requirements in specific applications, refer to the GESTRA non-return check valve manual PDF to ensure stable disc opening.

Certifications and Documents

  • Certification: CE marking (PED 97/23/EC); EN10204-2.2 material test report available as an option.

  • Related documents:

RK71 Product Data Sheet - Includes pressure-drop charts and installation instructions.

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