Does anyone know the application of double block and bleed valve, i understand this valve consists of double seats with a body bleed, is it correct? Aslo, i heard that in case the pressure rating 900 and above, the double block valve (Two valves seried with a bleed) shall be applied. Double Block and Bleed valve shall not be considered for this application.The application of double block and bleed valves has usually been client driven in my experience. I am not aware of any code or standard that requires the double block and bleed.On my current project we are using two types of single body, double block and bleed valves. For ANSI class 600 and below we use a twin seal plug valve. For ANSI class 1500 and above we use an expanding slab gate valve.

MORE NEWS