The flat-sealing Hy-Lok ZCO screw fittings have no clearance in axial direction during installation and removal (Zero Clearance). They have an O-ring face seal and are designed for vacuum up to high-pressure applications at high temperatures up to 280°C (550°F).
They are easy to install and maintain, and offer bores for leak tests.
Body, sleeve, nuts: | Stainless steel 316 |
Butt welding fittings: | Stainless steel 316L |
O-ring (standard): | Viton, hardness 70 Viton, Hardness 90 (SAE/MS thread) |
Material | Temperature |
Fluorocarbon | 400°F (200°C) |
Buna N (BU) | 250 °F (120 °C) |
PTFE (PE) | 450 °F (230 °C) |
Perfluoroelastomer (KA) | 550°F (280°C) |
Ethylene propylene (EP) | 300 °F (140 °C) |
ZCO assemblies are subjected to a 100% leak test with helium at a flow rate of 4 x 10-9 standard cubic metres/s and are absolutely leak-free.
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