The phrase Double Block and Bleed initially intended two different block valves which has a pipe and bleed valve concerning the valves to look for leakage. The Western Valve DAN-EX can be an acknowledged Block and Bleed Valve (DBBV) as it's two independent seating slips that are mechanically expanded in http://stainless-steel-tubing75173.diowebhost.com/23058673/double-block-and-bleed-valve-an-overview