Tianjin Exxon Valve Co.,Ltd, with professional factory, is one of the leading China class 150 butterfly valve manufacturers, we are able to offer you cheap class 150 butterfly valve, ccenteric butterfly valve. Welcome to wholesale products from us. The Features, 1, Correctin gholes are made on flange according to standard, easy correcting during installation. 2, Through-out bolt or one-side bolt used. Easy replacing and maintenance. 3, Shaft and disc connected by pin, torque screw or pinless, to achieve the opening asn closing http://www.aksvalves.com/