Founded in 1864, DET NORSKE VERITAS (DNV) is an authoritative, professional, and independent non-profit foundation. Its headquarter in Oslo, Norway. Under the principle of "Protecting life, Property and Environment", DNV provides customers with comprehensive risk management, various assessment and certification services, mainly involving ship classification services, certification services, technical services and so on.

Recently,  Sedelon Valve Co., Ltd. produced a batch of valves certified by the DNV. The certified valves included butterfly valves, globe valves, and check valves.

Here is valve brief specification and DNV Survey Report for reference:

Valve Type: Butterfly Valve

Size: 8’’, Class: 150LB

Valve Type: Globe Valve

Size: 12’’, Class: 150LB

Valve Type: Check Valve

Size: 6’’, Class: 150LB

Size: 4’’, Class: 150LB