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The internal structure of the exhalation valve cassette usually consists of the following parts:

Valve body: The valve body is the main component of the exhalation valve holder and is usually made of metal or plastic. It contains an outlet and an inlet for controlling the flow of gas. The inside of the valve body usually has some channels or holes for connecting or guiding the flow of gas.
Valve plate: The valve plate is the core part of the exhalation valve holder, usually made of metal or plastic. When the patient exhales or inhales, the pressure change of the gas acts on the valve plate, causing the valve plate to open or close, thereby controlling the flow of the gas. The movement of the valve plate is usually controlled by a spring or gravity mechanism.
Seal ring: The seal ring is usually installed on the inside of the valve body to seal the gap between the valve disc and the valve body to prevent gas leakage. The material of the sealing ring is usually rubber or silicone to ensure good sealing performance.
Connection part: The connection part of the exhalation valve holder is usually composed of screws, nuts, washers, etc., to connect the valve body to other parts of the ventilator. The connection part must be airtight to prevent gas leakage.
The internal structure of the exhalation valve holder needs to be optimized and adjusted according to the specific design and use to ensure its normal operation and long service life. In the process of use, it is necessary to pay attention to the maintenance and maintenance of the exhalation valve cassette, and regularly clean and replace the wearing parts such as the sealing ring to ensure its normal work and extend its service life.