A pump head or fluid block is the central component of a precision metering pump assembly responsible for the controlled displacement and delivery of fluid. It houses the critical pumping mechanism (such as a piston, diaphragm, or gear set) and defines the internal flow paths, ensuring precise volumetric accuracy and pressure generation for the pumped medium. The pump head operates by creating a sealed chamber where a mechanical actuator (e.g., piston, diaphragm) cyclically changes the chamber's volume. On the intake stroke, the volume increases, drawing fluid into the chamber through an inlet valve. On the discharge stroke, the volume decreases, pressurizing the fluid and forcing it out through an outlet valve, achieving precise metered flow. This component is typically manufactured from materials such as stainless steel (e.g., 316L), ceramic, PTFE (Teflon), or PEEK, selected for chemical compatibility and durability. Key parameters include maximum flow rate (0.5–50 L/h), operating pressure (1.0–1.6 MPa), maximum operating temperature (-40–85°C), stroke length (10–50 mm), stroke rate (30–120 strokes/min), repeatability accuracy (±0.5%), port size (1/4–1 inch NPT), wetted materials (SS316L per ASTM A240), seal material (PTFE per ASTM D4894), weight (2.5–8.0 kg), IP rating (IP54–IP65 per IEC 60529), and power consumption (30–90 W). These values are reference ranges and must be verified for the specific model and application. The pump head is a critical part in metering systems where precise dosing is required, such as in chemical processing, water treatment, and pharmaceutical manufacturing. Proper selection requires consideration of fluid properties, required flow and pressure, and environmental conditions. Always confirm model-specific specifications and standards with the legal manufacturer or supplier.
The pump head operates by creating a sealed chamber where a mechanical actuator (e.g., piston, diaphragm) cyclically changes the chamber's volume. On the intake stroke, the volume increases, drawing fluid into the chamber through an inlet valve. On the discharge stroke, the volume decreases, pressurizing the fluid and forcing it out through an outlet valve, achieving precise metered flow.
