Due to the planned shutdown of two cracker units in South Korea, Asian olefins market supply will be tight in March-April next year. At that time, approximately 1.57 million tons of ethylene per year, 845 thousand tons of propylene per year and 350,000 tons of butadiene per year will cease production. Hunan Petrochemical plans to conduct a 45-day shutdown inspection of its naphtha cracker in Lishui from March 1 to April 15 next year. The device is designed to produce 720,000 tons of ethylene, 360,000 tons of propylene and 130,000 tons of butadiene. At the same time, the No. 2 naphtha cracker at Lichung Naphtha Cracking Center (YNCC) in Lishui will be scheduled to be overhauled from March 20 to April 19 next year. The cracking unit is designed to produce 857,000 tons of ethylene, 485,000 tons of propylene and 220,000 tons of butadiene. Check Valve-TMOK,Foot Valve ,Double Check Valve ,Swing Check Valve Centrifugal Pump Co., Ltd. , http://www.nbballvalve.com