Tweening rotation problem

[GamingDev2879 (GamingDev)]

When I try to tween a union, it moves differently, when it should rotate just like a valve

My script

local TweenService = game:GetService("TweenService")
local Part = script.Parent.Part

local Open = TweenService:Create(Part, TweenInfo.new(5, Enum.EasingStyle.Exponential), {Orientation = Vector3.new(-30, -180, -90)})

wait(5)
Open:Play()

What happen

What should happen

Sorry for low quality videos

[Veexas]

local TweenService = game:GetService("TweenService")
local Part = script.Parent.Part

local Open = TweenService:Create(Part, TweenInfo.new(5, Enum.EasingStyle.Exponential), {Orientation = Part.Orientation + Vector3.new(0,360,0)})

wait(5)
Open:Play()

idk if this is the one u need