| 摘要 |
<p>A breathing valve having a housing comprising an inlet chamber in communication with which is an inlet opening controlled by an inlet valve, a passage to the breathing organs of the user and an exhalation valve. A control diaphragm subject on one side to the pressure in the inlet chamber acts through an intermediate member to control the inlet valve. An overpressure valve on the side of the control diaphragm across from the inlet chamber receives fluid through the exhalation valve and when the pressure in the overpressure chamber builds up it causes the control diaphragm to open the inlet valve. Springs act on the two diaphragms urging them towards the inlet valve opened position, thereby setting a predetermined pressure value in the overpressure chamber. With this structure, an overpressure is created in the inlet chamber during both inhalation and exhalation.</p> |
