Reference:sea-dweller: Difference between revisions
| [checked revision] | [checked revision] |
Sea-Dweller family hub — initial publish (4 in-scope refs: 1665, 16660, 16600, 116600) |
Family cleanup: cross-family dedup + intra-article dedup + bold-strip + Slop Cop sweep |
||
| Line 58: | Line 58: | ||
|} | |} | ||
== Helium escape valve | == Helium escape valve == | ||
The HEV sits at 9 o'clock on every Sea-Dweller. Swiss patent CH492246, filed 6 November 1967, granted June 1970. The concept emerged from SEALAB diver Bob Barth's feedback on lost crystals during chamber decompression. Helium dissolves through case gaskets at saturation pressure; on ascent, the trapped gas expands and pops crystals off the case if it cannot escape. The valve is a one-way spring-loaded relief mechanism: internal pressure above the spring threshold opens it, the spring re-seats against water and dirt ingress on the way back down. | The HEV sits at 9 o'clock on every Sea-Dweller. Swiss patent CH492246, filed 6 November 1967, granted June 1970. The concept emerged from SEALAB diver Bob Barth's feedback on lost crystals during chamber decompression. Helium dissolves through case gaskets at saturation pressure; on ascent, the trapped gas expands and pops crystals off the case if it cannot escape. The valve is a one-way spring-loaded relief mechanism: internal pressure above the spring threshold opens it, the spring re-seats against water and dirt ingress on the way back down. | ||
The 1665 carries the valve in its first generation. The 16660 enlarges it for the 1220-metre depth rating. The 16600 and 116600 inherit the larger valve | The 1665 carries the valve in its first generation. The 16660 enlarges it for the 1220-metre depth rating. The 16600 and 116600 inherit the larger valve. | ||
== Historical anchors == | == Historical anchors == | ||