Diaphragm Valve Body

The diaphragm valve body is a component used in beverage manufacturing systems to control the flow of process media. It is designed to be fitted with a diaphragm and an actuator (manual or automated) to form a complete diaphragm valve. The body provides the pressure-containing envelope and the flow path, while the diaphragm isolates the actuator from the process fluid, making the valve suitable for hygienic applications.

This directory entry covers common technical parameters for diaphragm valve bodies intended for use in beverage processing lines. Nominal diameters range from DN15 to DN100 per ISO 6708. The operating pressure range is 1.0–1.6 MPa (ISO 5208), with a note that below 1.0 MPa the seat load may be insufficient for reliable shutoff. Operating temperature is -10 to 80 °C, depending on the diaphragm material. Body materials include stainless steel grades CF8 and CF8M (ASTM A351) and carbon steel WCB (ASTM A216). Diaphragm materials include EPDM, PTFE, and FPM (ASTM D1418), selected based on chemical compatibility with the process media. End connections are flanged (per PN10/16, ISO 7005, GB/T 9113), threaded, or clamp type. The leakage rate is ≤0.01% (Rate A) per ISO 5208 for shutoff. Flow coefficient (Kv) ranges from 5 to 100 m³/h, varying with size. Weight ranges from 2 to 30 kg, depending on size and material. Face-to-face dimensions are 130–350 mm per ISO 5752 (Series 1 for flanged valves).

These values are reference ranges for directory purposes. Actual product specifications must be confirmed with the legal manufacturer or supplier for the specific model and application. Standards listed are procurement references and do not imply certification or compliance of any particular product. Always verify model-specific values and standards before purchase or installation.

The diaphragm valve body works by providing a sealed chamber where a flexible diaphragm is pressed against a weir or seat to control flow. When the actuator lifts the diaphragm, media flows through the body; when the diaphragm is lowered, it seals against the seat, stopping flow. The body's design ensures that the diaphragm isolates the process fluid from the actuator, preventing contamination and allowing hygienic operation. The operating pressure must be sufficient to ensure proper seat loading; below 1.0 MPa, the seat load may be inadequate for tight shutoff. The diaphragm material must be compatible with the process media and temperature range to maintain integrity and sealing performance.