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Hospital Secondary Pressure Reducing Box Oxygen 0.4 MPa Dual-Circuit Duty-Standby Wall-Mounted Valve. One duty + one standby regulator, continuous oxygen supply even during regulator maintenance or failure. Flow Range Standard version up to 100 m3/h; heavy-duty version up to 150 m3/h. Safety relief valve auto-vents on overpressure (0.55 MPa setpoint); 1.5-class pressure gauges with isolation valves. Real-time flow + cumulative consumption, Modbus communication for BMS / cloud integration.