Double Block & Bleed Inspection plug valves
Type DBI
- “double block & bleed” with only one valve
- inline bleed inspection
- reliable and tight
DN 15 – 600 / PN 63 – 160
NPS ½ – 24 / Class 600 – 900
Range of application:
-60 < T < 230/320°C
vacuum-capable
Double Block & Bleed Inspection plug valves
Type DBI
- “double block & bleed” with only one valve
- inline bleed inspection
- reliable and tight
DN 15 – 600 / PN 63 – 160
NPS ½ – 24 / Class 600 – 900
Range of application:
-60 < T < 230/320°C
vacuum-capable
Sealing systems
Design characteristics
- functionality DIB (double isolation and bleed) acc. to API 6D
- with bleed connection
- suitable for critical service
- adjustable plug in case of leakage
- simple and favourable automation
- Fire-Safe – API 607 / ISO 10497 (externally)
- low fugitive emission in line with TA LUFT, ISO 15848 & API 641 requirements
- long durability
Options
- vented plug
- customer-specific positioning of the test connections
- automatic thermal relief
- inspection valves
Sealing systems
Design characteristics
- functionality DIB (double isolation and bleed) acc. to API 6D
- with bleed connection
- suitable for critical service
- adjustable plug in case of leakage
- simple and favourable automation
- Fire-Safe – API 607 / ISO 10497 (externally)
- low fugitive emission in line with TA LUFT, ISO 15848 & API 641 requirements
- long durability
Options
- vented plug
- customer-specific positioning of the test connections
- automatic thermal relief
- inspection valves
Functionality
Block 1
Block 2
Inspection valve I
Inspection valve II
Bleed valve
- AZ plug valve with two self-sealing elements block 1 & 2
- closing of the valve, sealing of block 1 & 2
- opening of the bleed valve for tightnesstesting
- if necessary, actuation of the inspection valves
Complete system with compact dimensions
easy operation with hand lever, gearbox or quarterturn actuator
Plug adjustment
Fire-Safe sealing design and other sealing systems
no media underneath the cover
plug valve with full bore design (option)
Compact installation space
- no double-valve-system required
- face to face acc. to EN and ASME
- top-entry access
- easy accessibility for service
Vented plug prevents pressure build-up due to thermal expansion underneath the plug (optional)
Bleed inspection without loss of media due to goose neck pipe
Technical Comparison type DBI vs butterfly valve with bleed function
Installation: butterfly valve unit
Block 1
Block 2
Bleed valve
Separate gauge valve
Face-to-Face
Disadvantages
- 2 butterfly valves
- 2 separate actuators required
- gauge and bleed valve not integrated in valve body
Installation: AZ plug valve, type DBI
Block 1
Block 2
Bleed valve
Integrated inspection gauge plug valve
Face-to-Face
Advantages
- compact solution with 1 valve only
- gauge and bleed valve integrated in valve body
- 1 actuator
- easy replacemant of butterfly valve unit
Type DBI
Type overview with thermal relief
Type DBI-B
- bleed valve to check tightness when main valve is closed
- bleed outlet standard with “goose neck” pipe
- Accessories
- manometer/ pressure gauge
- pressure transmitter
- valve automation
- locking device
Type DBI-B&I
- bleed valve to check tightness when main valve is closed
- inspection valve for inspection and revision services
- Accessories
- manometer/pressure gauge
- pressure transmitter
- valve automation
- locking device
Type DBI-B&2I
- bleed valve to check tightness when main valve is closed
- inspection valve I and II (upstream / downstream) for inspection- and revision services
- Accessories
- manometer/pressure gauge
- pressure transmitter
- valve automation
- locking device
Type DBI-TR1
- thermal relief system to prevent pressure build-up due to thermal expansion in the plug
- isolation valve in case of service
- Accessories
- bleed valve
- manometer/pressure gauge
- pressure transmitter
- valve automation
- locking device
Type DBI-TR2
- thermal relief system to prevent pressure build-up due to thermal expansion in the plug and downstream pipeline
- isloation valves in case of service
- Accessories
- bleed valves
- inspection valves
- manometer/pressure gauge
- pressure transmitter
- valve automation
- locking device