Product Overview

The document details the specifications and technical data for the ZETKAMA Check Valve type 288, a flanged angle check valve designed for various industrial applications including hot and cold water plants, steam plants, industrial technologies, neutral fluids, and heat and refrigerating engineering.

Key Features

• Compliance with EN standards: Closing tightness per EN 12334, face-to-face dimensions per EN 558 series 8, and flanges drilled according to EN 1092-2.
• Compact design with environment-friendly materials and no maintenance required.
• Nominal pressure ratings up to 25 bar and maximum temperatures up to 350°C depending on material.
• CE marking for nominal diameters DN≥32, compliant with Pressure Equipment Directive 2014/68/EU.

Materials and Temperature Ratings

The valve body and components are made from various materials depending on the type and application:

• Grey cast iron (EN-GJL-250) for standard applications with max temperature up to 300°C.
• Nodular cast iron (EN-GJL-400-18) for higher strength, max temperature up to 350°C.
• Bronze (CuSn5Zn5Pb5-C and variants) for lower pressure and temperature applications (up to 225°C).
• Stainless steel components (X20Cr13, X12Cr13, X17CrNi16-2) used for stems, discs, and seat rings to ensure durability and corrosion resistance.
• PTFE disc gaskets available on request for temperature up to 200°C.

Dimensions and Pressure Ratings

The valve is available in nominal diameters ranging from DN15 to DN300 with pressure ratings PN6, PN10, PN16, and PN25 depending on the material and type. Detailed flange dimensions, bolt sizes, and weights are provided for each size and pressure rating.

Pressure-temperature rating charts illustrate allowable working pressures at various temperatures for different body materials and pressure classes:

• PN16 with EN-GJL-250 grey cast iron body: max 16 bar up to 300°C.
• PN16 and PN25 with EN-GJS-400-18 nodular cast iron body: max 16-25 bar up to 350°C.

Valve Types and Configurations

The document lists multiple valve types identified by figure numbers and material codes, describing the disc and stem configurations:

• Loose disc with spring and stainless steel stem, disc, and seat ring (e.g., type 31, max 300°C).
• Loose disc without spring with stainless steel components (e.g., type 41, max 350°C).
• Versions with bronze components for lower temperature and pressure applications.
• PTFE disc gasket versions for specific temperature limits.

Ordering Information

Orders should specify the product number (index), figure, body material, nominal diameter (DN), nominal pressure (PN), and type code. An example order code is provided: 288 040 C 31 indicating a grey cast iron body, DN40, PN16, loose disc with spring and stainless steel components.

Critical Information and Recommendations

• Ensure selection of valve type and material matches the operating temperature and pressure requirements.
• Verify flange compatibility with EN 1092-2 standards for installation.
• Note that data and specifications are subject to change without notice; always confirm with the latest manufacturer documentation.
• CE marking applies for valves DN≥32, ensuring compliance with EU directives.

This summary captures the essential technical specifications, materials, dimensions, pressure-temperature ratings, types, and ordering instructions for the ZETKAMA type 288 check valve series.