Chemical Resistance in Valve Selection Processes

This technical report discusses the critical factors involved in selecting valves and materials for applications in caustic environments. It emphasizes the importance of understanding chemical resistance, which is defined as a material's ability to withstand chemical attacks over time. The report outlines the selection of thermoplastic and elastomeric materials based on laboratory tests and real-world applications. It highlights the challenges manufacturers face in replicating field failures in laboratory settings due to unknown variables. The document details specific materials, such as chlorinated polyvinyl chloride (CPVC) and ethylene propylene diene terpolymer (EPDM), and their compatibility with various chemicals. It also discusses the use of diaphragm valves for sodium hypochlorite applications and the importance of consulting manufacturers for material compatibility recommendations. The report concludes by stressing the necessity of careful consideration during the valve selection process to ensure optimal performance and reliability.