Under the action of medium force, the opening force of stainless steel globe valve is bigger than closing force,the flow direction of ductile iron globe valve should be from above to bellow, when open the stainless steel globe valve, the flow rate can be maximum if the disc's opening height be 25%-30% of the normal diameter, meanwhile the valve can reach the fully opened position, so the position of fully open is up to the disc's stroke.Valve materials of constructionBody Materials: 304/316/316L