Detail
Remove Settled Deposits from the Boiler Bottom
While surface blowdown manages dissolved solids in boiler water, bottom blowdown removes sludge and solid deposits that settle in the lower section of the boiler. Rust, dirt, oil residues and other suspended particles can form a sludge layer over time, reducing heat transfer and increasing the risk of deposit-related corrosion.
Automatic, Timed Blowdown Cycles
VIRA DB2 automates the duration and interval of bottom blowdown cycles. The required schedule can be adjusted according to boiler capacity, operating conditions and the water-treatment programme, helping operators perform regular blowdown without relying solely on manual valve operation.
BK 4000 Bottom Blowdown Controller
The panel-mounted BK 4000 controller operates with a 230VAC supply. Its LCD display and three operating buttons provide straightforward adjustment of blowdown timer and interval settings. The controller supports automatic blowdown operation, valve-position signal monitoring and alarm functions, with one valve relay and one alarm relay output.
BKV 4000 Pneumatic Bottom Blowdown Valve
DB2 is supplied with the BKV 4000 pneumatic on-off bottom blowdown valve. The valve is available in DN 25, DN 32, DN 40 and DN 50 sizes, all with a PN 40 pressure class. Its spring-return pneumatic actuator supports controlled valve closing, while the valve features a WCB body, reduced-bore construction and metal-to-metal sealing for steam boiler service.
Valve Position Monitoring
The BKV 4000 valve set includes a switch box and NAMUR solenoid valve. The switch box provides valve-position feedback, allowing the controller and operator to monitor whether the blowdown valve has reached its open or closed position during the blowdown cycle.
Controlled Blowdown, Better Boiler Protection
By discharging sludge at planned intervals, DB2 helps keep boiler heat-transfer surfaces cleaner and supports more reliable steam production. It also helps avoid the inefficiency of excessive manual blowdown, where unnecessary hot water and energy may be lost.
| Controller | : | BK 4000 |
| Supply Voltage | : | 230 VAC |
| Functions | : | Automatic Blowdown, Valve Position Signal, Timer, Interval |
| Inputs | : | Limit Switch, Solenoid Valve, Blowdown Valve |
| Outputs | : | 1 Alarm Relay, 1 Valve Relay |
| Display | : | LCD |
| Button | : | 3 Pieces (Menü, Arrow, Set) |
| Max. Ambient Temp. | : | 55 °C |
| Enclosure | : | PA |
| Type | : | Panel |
| IP Class | : | IP 40 |
| Valve | : | BKV 4000 |
| Size | : | DN 25, 32, 40, 50 |
| Actuator | : | Pneumatic |
| Motor Type | : | On-Off, Spring to Close |
| Pressure Class | : | PN 40 |
| Body | : | WCB |
| Sealing | : | Metal to Metal |
| Supply | : | 220VAC, 24VDC (please ask) |
| Operat. Temp. | : | -10-+220 °C |
| Structure | : | Reduced Bore |
