What does Z941H-25DN250 mean by electric gate valve (excluding electric equipment)?

Stainless Steel Strainers High Temperature Check Valve Ductile Iron Poles Ductile Iron Vs Cast Iron Valves Cgi Cast Iron Cast Iron Vs Ductile Iron Valves Pearlitic Ductile Iron Cast Iron Ferrous Broken Cast Iron Annealing Cast Iron Adi Cast Iron Sg Cast Iron Grades Cast Iron Metallurgy Cast Iron Vs Iron Cast Iron Case American Ductile Iron Cast Iron Sphere Mottled Cast Iron Cast Iron Nickel Cast Iron Hanger