China cast steel gate valve: asme b16.34, api 600 cast steel gate valves, os&y, rising stem, bolted/pressure seal bonnet, bw, 150lb-2500lb, 2-48 inch. Features: Os&y, rising stem. Bolted bonnet/pressure seal bonnet. Flexible wedge. Extended bonnet for cryogenic services. By pass on request. Locking device optional. Replaceable seat.