We are offering flapper-nrv-valve.Pressure rating asa 150 # 300 #design api 599 bs 5353face to face ansi b 16.10end connection flanged, screwed, socket weld, butt weldm.o.c. cs ss304 ss316 wcb cf8 cf8m & higher alloys on requestoption 3-way, 4-way, partial jacketed, fully jacketed, cage control, sampling, gear operated, actuator operated.operation hand lever gear actuatorsize range 15mm to 250mm.