Needle Roller Bearing,Needle Bearing,Drawn Cup Bearing Fenghua Jade Motor Co., Ltd. , http://www.gosbearing.com1. The valve path must be blocked at both ends, there is dry and ventilated room. Such as long-term storage, should always check anti-corrosion. 2. The valve should be clean before installation and eliminate the defects caused during transportation. 3. Installation must be carefully checked on the valve signs and nameplate meets the requirements. 4. The valve installed in the horizontal pipe, valve cover up.