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Name: Double disc check butterfly valve / Double plate check valve / Check valve. Application : Check valve is used for preventing the back-gone of medium in pipelines and equipments , It will open and close automatically by the pressure of medium . When the medium is back-going , valve disc will close automatically to avoid accidents. Features: -Tightly sealed , without leakage under the water pressure testing . -Economical ,light weight , compact design-significantly lighter and less expensive than comparable swing check valves. -Easy to install and maintain. Our company has very strong technical ability and production capacity , from originally product design , to casting , machining and final product assembly, main products include : 1. Wafer type butterfly valve-butterfly valve with lever , Gear box , Pneumatic apparatus , electronic apparatus , Fire-proof butterfly valve . 2.Butterfly check valve, Grooved end butterfly valve , Lug type butterfly valve , Industry butterfly valve , Non rising stem single wedge disc Gate valve . 3.Flange Butterfly valve-(U type )Flange Butterfly valve , Electronic Flange Butterfly valve , Pneumatic Flange Butterfly Valve . 4.Double eccentric Butterfly valve , (eccentric /pneumatic) eccentric butterfly valve . 5. 5.Butterflyvalve and check valveof Stainless - with lever , ball valve with electronic apparatus . 6. Y - Strainer , middle line flange butterfly valve ,Corrosion resistant butterfly valve.etc. 7.Dismantling joint/ Coupling / flange adaptor. Pls rest assured the quality and price . Sincerely looking forward to establish business relationship with you ! any questions you can contact me directly !