The BFD series is a spring-return diaphragm metering pump; the BFDYJ and BFMYJ series are mechanical-return diaphragm metering pumps. Key performance parameters: Maximum single-head flow rate: 2000 L/H, Maximum discharge pressure: 12 bar, Adjustment ratio 10:1, Steady-state accuracy ±2%, Maximum inlet pressure 2 bar, Maximum allowable material temperature: 40°C for PVC, 90°C for stainless steel. Main applications: Municipal, swimming pools, industrial water and wastewater treatment, industrial production processes, etc. Key features: Variable eccentric mechanism adjustment on the drive end ensures low noise; Smooth flow pulsation ensures high repeat accuracy; Enhanced structural design suitable for harsh operating environments; Wear-resistant ball bearings for stable operation; Oil bath lubrication ensures long service life of drive components and high efficiency during prolonged operation; Flow rate adjustable both during operation and shutdown, with options for manual, electric, or variable frequency adjustment. Hydraulic end: Mechanically driven diaphragm, PTFE diaphragm suitable for various media; Multiple pump head materials including PVC, PTFE, PVDF, SS304, SS316, suitable for high-viscosity and slurry materials. Control methods: Motor controller, controlling the motor via "on/off" mode, with manual adjustment of output flow; Electric stroke controller, accepting external control signals to adjust stroke length; Power supply: 220V-50Hz single-phase; Input signal: 4-20mA analog signal; Output signal: 4-20mA/1-5V analog signal for recording, display, and control systems. Variable frequency controller, accepting external control signals to adjust stroke speed; Power supply: 220V-50Hz single-phase / 380V-50Hz three-phase; Input signal: 4-20mA analog signal.