Overview

This document provides comprehensive technical details and specifications for the Wafer Pattern Butterfly Valve Type Z 011-A by Ebro Armaturen, designed for diverse industrial applications requiring reliable sealing and operational efficiency.

1. Technical Specifications

• Nominal Diameter Range: DN 20 to DN 1200 (DN 20 limited to PN 10/16)
• Pressure Ratings: Maximum operating pressure up to 16 bar
• Temperature Range: -40°C to +200°C, depending on pressure, medium, and material
• Standards Compliance: EN 558 Series 20, ISO 5752 Series 20, API 609 Table 1, EN 1092 PN 6/10/16, ASME Class 150, AS 4087 PN 16, EN ISO 5211, EN 19, EN 12266 (Leakage rate A), ISO 5208 Category 3
• Flange Surface Design: EN 1092 Form A/B, ASME RF, FF
• Face-to-Face Dimensions: According to EN 558 and ISO 5752 Series 20

2. Pressure Rating and Disc Size Adaptation

Valve discs are tailored to pressure ratings of 3, 6, 10, and 16 bar, with disc sizes matched to nominal diameters. Smaller valves (DN 20–32) support up to 10 bar, while larger valves (up to DN 1200) accommodate up to 16 bar.

3. Torque Values

• Initial breakaway torque values (in Nm) vary by valve size and opening angle (20°–90°).
• Torque depends on pressure, medium, rubber type, quality, and temperature.
• Adjustment factors: multiply torque by 1.3 for powdery, non-lubricant media; by 1.2 for dry gases or high-viscosity media.

4. Kv-Values (Flow Coefficients)

• Kv-values indicate water flow rate (5°C–30°C) at 1 bar pressure differential, based on tests by Delfter Hydraulics Laboratories.
• Maximum permissible flow velocity: 4.5 m/s for liquids, 70 m/s for gases.
• Throttle function is linear between 30° and 70° valve opening.
• Cavitation must be avoided to ensure valve integrity and performance.

5. Features

• Bidirectional tight sealing
• Precisely machined body and disc for low torque and durability
• Triple shaft bearings prevent deflection and ensure long-term guidance
• Four flange mounting holes for precise installation
• Installation possible in any orientation
• Maintenance-free design
• Disassemblable for material-specific recycling
• Silicon-free version available for paint and lacquer applications

6. General Applications

Applicable in chemical and petrochemical industries, water and wastewater treatment, pneumatic materials handling, shipbuilding, power generation, and hazardous materials transport compliant with EN 14432.

7. Material Specifications and Parts List

• Body Materials: Aluminium alloys (G-AlSi9Cu3, G-AlSi8Cu3), Grey Cast Iron (GG-25), Nodular Cast Iron (GGG-40, GGG-40.3), Carbon Steel (GS-C25), Stainless Steel (G-X5CrNiMo19-11-2), Aluminum Bronze (CuAl10Ni), Hastelloy
• Seat Materials: Fluorocarbon rubber (FPM), Nitrile butadiene rubber (NBR), EPDM, Chlorosulfonated polyethylene (CSM), Silicone rubber (VSI), Styrene butadiene rubber (SBR-green)
• Bearings: Brass (MS 58), Polyamide (PA 66), PTFE
• Seals and O-rings: NBR, FPM
• Shafts: Stainless Steel grades (X39CrMo17-1, X14CrMoS17, X5CrNiMo17-12-2), Aluminum Bronze
• Coatings: Halar, Rilsan; surface finishes include electropolished and mirror finish options

8. Dimensions and Weights

Comprehensive dimensional data and weights are provided for DN 20 to DN 1200 valves, including length parameters (A, B, C), flange sizes, shaft types (2-piece or TS-shaft), and flange mounting details per EN ISO 5211.

9. Additional Notes

• Torque and Kv-values are approximate; consultation with engineers is recommended for precise application data.
• Valve design supports optional shaft ends with double flats per EN ISO 5211.
• Specifications are subject to change without notice.