Watch Glossary Terms
- Annual Calendar
- Balance Wheel
- Bevel
- Bluing
- Bracelet
- Bridge
- Calibre
- Chronograph
- Chronometer
- Cock
- Crown
- Deployant
- Enamelling
- Engraving
- Escapement
- Finissage
- Gear Train
- Geneva Stripes
- Glashütte Ribbing
- GMT
- Gold Chatons
- Guilloché
- Helium Valve
- Index Adjuster
- Jewel
- Minute Repeater
- Perlage
- Perpetual Calendar
- Pin Buckle
- Power Reserve Indicator
- Rattrapante
- Rotor
- Sandwich Dial
- Sapphire Crystal
- Screw Balance
- Spring barrel
- Three-quarter plate
- Tourbillon
- Vibrations per hour (vph)
Helium Valve
- 31/08/2011
When diving at great depths, divers will acclimatise within a diving bell to increase their tolerance to the pressures at the working depth.
On returning to the surface, great pressure within the watch case could result in the watch glass popping out as the pressure returns to atmospheric levels, hence a helium valve is fitted to release the pressure to prevent damage
Rolex incorporate a helium valve in their Oyster Perpetual Sea-Dweller.
