Technical Catalog Overview

This document is a technical catalog detailing diaphragm valves, specifically membrane valves, used for controlling fluid or inert gases. It covers specifications, design features, materials, and application guidelines.

1. Valve Description and Functionality

• The diaphragm valve features a low-maintenance membrane actuator controlled by air or inert gases.
• Available in normally closed (NC), normally open (NO), and double acting (DA) control functions.
• Constructed from high-grade plastic materials suitable for selective applications.
• Membrane valves are designed for medium to high purity applications, with actuator housings made from high-grade plastic materials.
• Valve operation is pneumatic, with air or inert gas control.

2. Technical Features and Standards

• Valve chemical resistance depends on fluid type, temperature, pressure, and valve materials.
• Optimized flow due to body design.
• Perforated circular seat design for the diaphragm.
• Stainless steel mounting inserts support the valve; inserts are consistent across all valve types.
• Support for medium purity valves with mounting inserts in acid-resistant stainless steel.
• Standard handwheel and optional manual override available.
• Actuator diaphragm made from EPDM, NBR, or PTFE backing.
• Membrane valves support EPDM, NBR, or PTFE diaphragms.

3. Materials and Construction

• Valve bodies and components are made from high-quality plastics and stainless steel inserts.
• Diaphragms are available in EPDM, NBR, or PTFE backing materials.
• Valve dimensions and weights are provided for various nominal diameters (DN 15 to DN 50).

4. Dimensional Data and Performance Parameters

• Detailed tables provide dimensions (d, L, G, H, J, K, S, etc.) and weights for different valve sizes and configurations.
• Flow rate coefficients (Kvs) are listed for each valve size, indicating flow efficiency.
• Pressure and temperature ratings are included, supporting medium to high purity applications.

5. Installation and Usage Recommendations

• Valve information is provided "as is" at the revision date; updates are not automatic.
• Users must verify applicability and legal compliance before use.
• All rights reserved; reproduction or distribution without prior consent is prohibited.
• Contact information for the manufacturer (Polysilph Italia) is provided for support and inquiries.

6. Summary of Key Specifications

• Valve types: Normally closed, normally open, double acting.
• Actuator: Pneumatic membrane actuator controlled by air or inert gases.
• Materials: High-grade plastics for body, stainless steel inserts, EPDM/NBR/PTFE diaphragms.
• Sizes: DN 15 to DN 50 with detailed dimensional and weight data.
• Flow coefficients and pressure ratings suitable for medium to high purity fluid control.

This catalog serves as a comprehensive guide for selecting and applying diaphragm membrane valves in various industrial fluid control scenarios, emphasizing purity, chemical resistance, and reliable pneumatic operation.