Covidien PB840 Ventilator Safety Valve 4-072400-00 for Hospital Medical Device

Covidien PB840 Ventilator Safety Valve 4-072400-00 for Hospital Medical Device

► Brief Description

The Covidien PB840 Ventilator Safety Valve (part number 4-072400-00) is constructed from stainless steel, ensuring robustness and durability, with an exterior that offers excellent corrosion and oxidation resistance. It bears the original manufacturer's part number, confirming its authenticity and ensuring full compatibility with the PB840 ventilator. Equipped with a red connecting lead and pre-drilled screw holes, it is designed for easy installation. Although compact and weighing approximately 0.5 kg, it serves as a core safety component within the PB840 ventilator's pneumatic system, playing a critical role in ensuring the device's proper operation. From overpressure protection to emergency ventilation, and from routine self-tests to fault diagnosis, this component is essential to the PB840's comprehensive safety design.

► Specifications

►Detailed Photos

►Basic Functions of the Safety Valve

1.Overpressure protection. A safety valve is incorporated into the inspiratory assembly to relieve excessive airway pressure. If an abnormality—such as an obstruction or kinking of the patient circuit—causes airway pressure to exceed the safety threshold, the safety valve automatically opens to vent excess pressure, thereby preventing barotrauma to the patient's lungs.

2.Emergency ventilation support. In the event of ventilator malfunction, the safety valve automatically opens to vent the patient circuit to the atmosphere, ensuring the patient can breathe ambient air and preventing suffocation.

►Operating Principle

The safety valve operates via electromagnetic actuation. During normal ventilation, the valve is electrically energized to remain closed, ensuring gas is delivered to the patient according to set parameters.

Specifically, full power is applied to pull the valve to the closed position; after a brief interval, power is reduced to maintain that closed state.

The safety valve de-energizes and opens—entering the "safety valve open" state—under the following conditions:

Simultaneous loss of air and oxygen supplies

Detection of a circuit obstruction

The ventilator enters a "Ventilator Inoperative" state

Power failure occurs

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