by mark@spectralvision.media | Jul 15, 2026
TL;DR A 37-degree flare seals metal-to-metal on a flared tube cone, per SAE J514 (AN/JIC). Dash sizes count 1/16-inch steps of tube OD (dash-8 equals 1/2 in.). A 37-degree flare is not a pipe thread and is not the same as a 45-degree flare. Specify 316 stainless for...
by mark@spectralvision.media | Jul 14, 2026
TL;DR Tubing quality decides whether a fitting seals; order fully annealed, fitting-grade tube. Seamless resists pressure better; welded-and-drawn is economical for lower pressure. Wall thickness sets the pressure rating and must suit the tube OD. Hardness must stay...
by mark@spectralvision.media | May 14, 2026
TL;DR Ball valves give you fast, positive shutoff with a quarter-turn handle and almost no pressure drop when fully open. Three configurations dominate industrial service: one-piece (compact, light-duty), two-piece (most common), three-piece (rebuildable in place)....
by mark@spectralvision.media | May 14, 2026
TL;DR Check valves stop reverse flow. They open under forward pressure and close instantly when flow reverses. Five common designs: poppet, ball, swing, disc, and diaphragm. Pick by service, cracking pressure, and acceptable pressure drop. Backflow into a pump,...
by mark@spectralvision.media | May 14, 2026
TL;DR Needle valves give fine flow control by driving a tapered stem into a matching seat. Parker, Swagelok, and Hoke each dominate a different slice of the market — Parker on inventory depth, Swagelok on breadth, Hoke on precision and high-purity service. Pick by...
