forged or casted check- valve * ND 8 (1/4") to ND 25 (1"). * ISO NP 20 to 420 (Class 150 # to 2500 #). * Carbon steel, stainless steel, duplex, super-duplex. * Closing by gravity, horizontal installation. * Screwed bonnet. * Industry. * Cool-hammered stainless steel guided ball. * Options : o spring closing.