DIB Ball Valve
DIB ball valves: DIB-1 Ball Valve, both seats are double piston seats, the fluid will isolated from both sides; DIB-2 Ball Valve, one seat is double piston seat, the other seat is self relieving seat.
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Key Specifications / Features
DIB ball valve provides a seal against pressure from a single source, with a means of venting/bleeding the cavity between the sealing surfaces.
DIB ball valve definition in API 6D:
Single ball valve with two seating surfaces, with two sealing 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 sealing surfaces. This feature can be provided in one direction or in both directions
Two types of DIB ball valves:
DIB-1 Ball Valve: Double Piston Seat x Double Piston Seat
For the DIB Double Piston x Double Piston (DIB-1)configuration, over pressurization of cavity is external with a safety valve.
Upstream and downstream sealing; pressure energized; two seats are bidirectional sealing seats.
Advantage: Each seat can isolate the fluid from upstream and downstream, if one seat is damaged, the other seat still work to ensure the sealing performance.
DIB-2 Ball Valve: DPE Seat x Self Relieving Seat
For the DIB Self relieving x double piston (DIB-2) configuration, cavity over pressurization is internally controlled within the line.
Upstream and downstream sealing; pressure energized; one seat is bidirectional seat and one seat is unidirectional sealing seat.
For DIB-2 Ball Valve, the fluid can be relieved from one seat to downstream side.
Advantage: Self-relieving seat, no need to assembly the safety valve for pressure relieving.
Both DIB-1 & DIB-2 are for trunnion mounted ball valve structure.
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