Does the ball valve have blow-out proof stem ?

Yes, the valve stem is downloading,with its inverted sealing structure with sealing gasket. The force of inverted sealing structure will increase while the medium pressure in the valve cavity increases,to ensure the sealing effect of the stem.In case of abnormal pressure increasing of the valve cavity,the stem won’t be impacted out.The filler is designed with proper V shaped structure,which can effectively convert the medium pressure inside the valve cavity and the locking force of outer gland into the sealing force of stem.