| 摘要 |
<p>A diver's demand valve has a diaphragm 15 with a centrally located rigid element 16 which pivots with a lever effect on an eccentric port 22 upon establishing an operative pressure difference across the diaphragm to open and close the valve. An abutment surface 30 prevents unwanted pivoting and a spring 27 keeps the rigid element 16 seated except during operative pressure differences. For a diver's exhalation demand valve an "anti-squeeze", safety, flap valve 34 may be provided in the rigid element 16.</p> |
