Double Block and Bleed Valves (DBB) and Double Isolation and Bleed (DIB)
Exotica Valves™ manufactures a unique range of Double Block and Bleed Valves (DBB) and Double Block and Isolation Valves: the Exotica DXB™ (DBB) and Exotica DXI™ (DIB). The main definition for Double Block and Bleed valves comes from API, where a Double Block and Bleed valve is "a single valve with two seating surfaces that, in the closed position, provides a seal against pressure from both ends of the valve, with a means of venting/bleeding the cavity between the seating surfaces." DBBs can therefore come in different shapes and forms, since APIs definition is a functional rather a design definition. Double Isolation and Bleed (DIB) valves, on the other hand is defined by API to be a "single valve with two seating surfaces, each of which, in the closed position, provides a seal against pressure from a single source, with a means of venting/bleeding the cavity between the seating surfaces." So the DBB blocks pressure from both ends whereas the DIB offers the enhanced performance of sealing against pressure that comes from one end only.
DBB and DIB range
Normal Size: 1/2”~2”
Pressure rating: 150 LB~2500 LB
Design Standard: API 6D
Design Features: Piston or Swing type, BB, WB, PSB.
