Hollis Explorer User Manual - page 110
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BOV REASSEMBLY
• Clean the mushroom valve carrier O-ring and the groove around the
mushroom valve carriers. Lightly grease and refit new O-rings.
• Inspect the mushroom valve and mushroom valve carrier for damage.
Wash/disinfect and remove any debris from the carrier.
• Clean the mushroom valve carrier O-ring and the groove around the
mushroom valve carriers. Lightly grease and refit the O-rings.
• Refit the mushroom valves to the carriers.
DANGER: DO NOT put grease on the mushroom valve.
• Having cleaned and disinfected the BOV outer; hold the BOV in your
hand with the mouthpiece towards you and the second stage port facing
forwards. Position the right hand side mushroom valve carrier with the
valve facing out and the left hand side valve carrier with the valve facing in,
into the mouthpiece. Install the valve/carrier assembly in by pressing on
the edges of the carrier, do not press on the center of the mushroom valve
Ensure the O-rings around the mushroom valve carriers have not extruded
out of their grooves.
DANGER: Check the flow in the BOVis from diver's left to diver
right (with the mouthpiece in the diver's mouth).
• Inspect and clean the rubber mouthpiece. Refit with a tight cable tie.
Remove sharp edges from the cable tie.
BOV PRIMARY TEST
In closed circuit mode, block the right hand (exhale) side and blow (do not
apply excessive force) into the mouthpiece. The inhale (diver's left side)
mushroom valve should seal and no gas should exit out of the second
stage exhaust port or the front diaphragm plate.
Faults:
• Mushroom valve (inhale side) leak. Remove the carrier and inspect
again.
• BOV barrel O-ring or activation handle O-ring leak. Replace O-ring.
In closed circuit mode, block the inhale (diver's left) side and suck into the
mouthpiece.
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