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C#, 106 97 80 79 bytes

s=>$@" |\n /_\\n |{string.Join("|\n |",s.ToCharArray())}|\n |_|\n/___\\n VvV"; 

I don't have C# 6 to try the above but I believe it will work

Saved 7 bytes thanks to Kevin Cruijssen

Thanks to manatwork for pointing me in the right direction to save 17 bytes

Saved 1 byte thanks to milk

C#, 106 97 80 74 bytes

s=>$@" |  /_\  |{string.Join("|\n |",s.ToCharArray())}|  |_| /___\  VvV"; 

I don't have C# 6 to try the above but I believe it will work

Saved 7 bytes thanks to Kevin Cruijssen

Thanks to manatwork for pointing me in the right direction to save 17 bytes

Saved 6 bytes thanks to milk

C#, 106 97 80 bytes

s=>$" |\n /_\\\n |{string.Join("|\n |",s.ToCharArray())}|\n |_|\n/___\\\n VvV"; 

I don't have C# 6 to try the above but I believe it will work

Saved 7 bytes thanks to Kevin Cruijssen

Thanks to manatwork for pointing me in the right direction to save 17 bytes

C#, 106 97 80 79 bytes

s=>$@" |\n /_\\n |{string.Join("|\n |",s.ToCharArray())}|\n |_|\n/___\\n VvV"; 

I don't have C# 6 to try the above but I believe it will work

Saved 7 bytes thanks to Kevin Cruijssen

Thanks to manatwork for pointing me in the right direction to save 17 bytes

Saved 1 byte thanks to milk

C#, 106 97 bytes

using System.Linq;s=>$" |\n /_\\\n{string.Join("",s.Select(c=>" |"+c+"|\n")} |_|\n/___\\\n VvV"; 

I don't have C# 6 to try the above but I believe it will work

Saved 7 bytes thanks to Kevin Cruijssen

C#, 106 97 80 bytes

s=>$" |\n /_\\\n |{string.Join("|\n |",s.ToCharArray())}|\n |_|\n/___\\\n VvV"; 

I don't have C# 6 to try the above but I believe it will work

Saved 7 bytes thanks to Kevin Cruijssen

Thanks to manatwork for pointing me in the right direction to save 17 bytes