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NAF

NAF

Product catalog summary

Overview: This document provides technical specifications and details for NAF-Check Valves, which are suitable for use with liquids, gases, vapors, aggressive fluids, and low temperatures. The valves are available in nominal sizes ranging from DN 40 to 1000 mm and pressure ratings from PN 10 to 100.

Materials: The valves are constructed from various materials depending on the application requirements:

Steel: Used for body and flap in sizes DN 40-1000 mm, with specific grades like EN 1.4404 and ASTM A 216 WCC.
Stainless Steel: Available for both body and flap, with materials such as EN 1.4408 and EN 1.4470.
High-Temperature Steel: Suitable for high-temperature applications, using materials like EN 1.7357.

Pressure/Temperature Ratings: The document outlines maximum service pressures and related temperatures for different materials:

Steel: Suitable down to -10°C with varying pressures depending on size.
Stainless Steel: Suitable down to -40°C with specific pressure ratings.
High-Temperature Steel: Maintains high pressure ratings across a wide temperature range.

Weight and Dimensions: Detailed dimensions and weights are provided for each valve type and size, indicating the physical characteristics necessary for installation and operation.

Pressure Drop Chart: The document includes a pressure drop chart for water at 20°C, which can be used to calculate equivalent water volume flow rates for other fluids. The chart is applicable to valves with horizontal flow, with minor deviations for vertical flow.

Key Considerations:

Valves are designed for specific pressure and temperature conditions, and material selection is critical for performance.
Pressure drop characteristics vary with flow orientation and pressure rating.
Installation and operational parameters must be adhered to for optimal performance.

Catalog excerpts

NAF-Check Valves Pressure/Temperature Ratings for liquids, gases, vapours, aggressive fluids and ') without spring 3) Max. Einsatztemperatur bei Ausführung mit Feder + 300 °C.

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NAF-Check Valves Pressure Drop Chart The curves given in the chart are valid for water at 20 °C. To read the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph. The values indicated in the chart are applicable to valves with horizontal flow. With vertical flow insignificant deviations occur only within the range The chart and flow characteristics are available up to and including PN 40. Higher PN increase the zeta values and pressure drops at the same The kvs values decrease accordingly. Equivalent water volume flow Volume of fluid (operating...

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NAF

NAF

Catalog excerpts

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