Product Overview

The document details the specifications and features of the ZETKAMA Check Valve model 302, designed for use in hot and cold water plants, steam plants, industrial technologies, neutral fluids, and heat and refrigerating engineering. The valve is flanged, straight form, with nominal diameters ranging from DN 40 to DN 300 and nominal pressures up to PN 16 bar. It complies with the Pressure Equipment Directive 2014/68/EU.

Key Features

• Closing tightness according to EN 12334.
• Compact settlement and environment-friendly design.
• Maintenance-free operation.
• Flanges drilled per EN 1092-2 standard.
• Face-to-face dimensions conform to EN 558 series 48.
• Maximum operating temperature up to 300°C depending on type.

Materials and Construction

The valve body is primarily made from grey cast iron (EN-GJL-250), with options for nodular cast iron and bronze components depending on the type. Flap and seat ring materials vary between stainless steel, bronze, nodular cast iron with EPDM sealing, and EPDM-covered flaps. Pins, bearings, gaskets, bolts, and other components use materials such as stainless steel (X20Cr13), brass, carbon steel, and graphite, selected to meet temperature and pressure requirements.

Material Highlights:

• Body: EN-GJL-250 (grey cast iron), EN-GJS-500-7 (nodular cast iron).
• Flap and seat ring: Stainless steel, bronze, or nodular cast iron with EPDM.
• Seals and gaskets: EPDM and graphite.
• Fasteners: Carbon steel and stainless steel grades.

Dimensions and Weight

The document provides detailed dimensional data for nominal diameters DN 40 to DN 300, including flange dimensions (diameter, bolt circle, number of bolts), face-to-face length, and weights for various types. For example, DN 40 has a flange diameter of 125 mm and weight around 9 kg, while DN 300 has a flange diameter of 460 mm and weight up to 120 kg depending on the type.

Pressure-Temperature Ratings

The valve is rated for PN 16 bar at temperatures up to 300°C for grey cast iron bodies. The pressure rating decreases with increasing temperature, as per standard pressure-temperature curves. For example, at 250°C, the allowable pressure is approximately 11.2 bar.

Valve Types and Temperature Limits

The document lists multiple valve types differentiated by flap and seat ring materials, presence of counterweights, levers, and special features such as by-pass or epoxy paint coating. Each type has specific maximum temperature ratings:

• Type 01: Stainless steel flap and seat ring, max 300°C.
• Type 02: Bronze flap and seat ring, max 225°C.
• Type 06: Nodular cast iron flap with EPDM ring, max 120°C.
• Types 11, 21, 91: Stainless steel flap and seat ring with counterweights or by-pass, max 300°C.
• Types with '-D' suffix: Epoxy paint coated versions with max 80°C.
• Types 66, 76, 86: EPDM covered flap variants, max 120°C.

Ordering Information

Orders should specify the product number (index) composed of figure, ends, form, nominal diameter, nominal pressure, and type. For example, "302 040 C 01" corresponds to a check valve with figure 302, DN 40, PN 16 bar, type 01 (stainless steel flap and seat ring).

Critical Specifications and Recommendations

• Ensure flange drilling complies with EN 1092-2 for compatibility.
• Verify temperature and pressure ratings against application requirements.
• Select valve type based on fluid temperature, material compatibility, and presence of counterweights or special features.
• Note that epoxy painted types are limited to 80°C maximum.
• Maintenance is generally not required, but periodic inspection is recommended for safety and performance.

Summary

The ZETKAMA 302 check valve is a robust, maintenance-free valve suitable for a wide range of industrial applications involving neutral fluids, steam, and water. Its compliance with European standards and availability in multiple material and design variants allows for tailored solutions to meet specific temperature and pressure demands.