http://www.biyi-valves.com/check-valve/Check Valve factory Product Description Price: The price is changing because of material cost and exchange rate. Please give me your CF8M, CF3, CF3M, A1105, LF2, F91&Other material as client required * Operation: Hand wheel, Bevel gearbox, Pneumatic,Electric * Suitable Temperature: -29掳C~425掳C * Connection: ASME B31.4 , ASME B31.8 ,ANSI B16.25,ANSI