Keyspan Full Face Mask 9000422 E - Manual (Page 6)

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5.4 Replacing the inhalation valve discs
• Remove the connector lid.
• Remove the rubber inhalation valve seat (by pulling from the tip) (fig. 13).
• Remove the inh. valve disc (fig. 14) and replace it.
• Put the valve seat back to the bottom of the valve body. Do not press too tight (the disc comes
immobilised) because the disc must be free to move.
• The valve discs of the inner mask (fig. 15) are replaced similarly. Make sure that the rubber edge of
the inner mask comes in the valve seat groove.
Fig. 13 Fig. 14 Fig. 15
5.5 Replacing the speech diaphragm
• Bend the head harness over the visor (fig. 16).
• Fold the jaw cup inside out, towards yourself (fig. 17).
• Remove the speech diaphragm (fig. 18).
• To make assembly easier, moisten the O-ring with water. Position the tip of the speech diaphragm
into the notch of the connector (fig. 19-20) to prevent any leakage. Press the speech diaphragm
into place (fig. 21).
• Fold back the jaw cup (fig. 22).
Fig. 16 Fig. 17 Fig. 18 Fig. 19
Fig. 20 Fig. 21 Fig. 22
5.6 Replacing the head harness
Thread the rubber bands through the buckles (fig. 23).
Fig. 23