Detail
Automatic Surface Blowdown for Stable Boiler Conditions
The VIRA D-BS4 is designed for steam boilers operating under stable or limited-variable temperature and pressure conditions. It monitors boiler-water conductivity and automatically controls surface blowdown to help maintain the selected TDS range, support steam quality and reduce unnecessary water, heat and treatment-chemical losses.
Conductivity-Based TDS Control
As steam is generated, dissolved solids become concentrated in boiler water. When conductivity exceeds the configured limit, D-BS4 operates the surface blowdown valve to discharge a controlled quantity of boiler water. Once the required conductivity range is restored, the valve closes to prevent unnecessary blowdown.
D-BK 5000-T New-Generation Controller
The system uses the D-BK 5000-T controller, operating with a 24VDC supply. Its touchscreen interface supports monitoring and adjustment of conductivity set point, hysteresis, high-conductivity alarm and blowdown control settings. The controller can be installed on a DIN rail or mounted on a control panel, providing flexible installation for new boiler systems and modernisation projects.
Monitoring and System Integration
D-BK 5000-T provides valve control and alarm functions together with 4–20 mA conductivity information and RS485 Modbus communication. This allows conductivity values and blowdown status to be integrated into a boiler-room monitoring or automation system where required.
BD 5400 Conductivity Probe and DG 5400 Probe Body
Boiler-water conductivity is measured by the BD 5400 conductivity probe. The probe is installed with the DG 5400 probe body to ensure correct positioning and reliable contact with boiler water. DG 5400 is available in sizes compatible with the selected BKV 5400 blowdown valve, allowing the measuring and blowdown components to be matched to the boiler connection size.
BKV 5400 Surface Blowdown Valve
The BKV 5400 surface blowdown valve controls the discharge of boiler water when conductivity exceeds the configured limit. It is available in DN 20, DN 25 and DN 40 sizes, all with a PN 40 pressure class. The valve has a WCB body, metal-to-metal sealing and a sampling outlet located below the valve.
Actuator Options for the Application
BKV 5400 can be supplied with either a pneumatic actuator or an electric actuator, allowing the valve configuration to be selected according to the available utility supply, control philosophy and project requirements.
Efficient Boiler-Water Management
By controlling blowdown according to actual conductivity, D-BS4 helps maintain stable boiler-water conditions and reduce the risks associated with high TDS, including carryover, deposits and reduced steam quality. Controlled discharge also helps limit avoidable losses of hot water, energy and treatment chemicals.
| Controller | : | D-BK 5000-T |
| Supply Voltage | : | 24VDC |
| Functions | : | Automatic Blowdown, Conductivity Set, Cond. Hysteresis, High Cond. Alarm, Valve On-Off, Calibration |
| Inputs | : | Conductivity Probe Input, Ground, PT 100 , Blowdown Valves |
| Outputs | : | 1 Valve On-Off Relay, 1 Alarm Relay, 4-20 mA Cond. Level Info, RS485 Modbus |
| Display | : | Touch Screen |
| Max. Ambient Temp. | : | 55 °C |
| Enclosure | : | PC |
| Type | : | Panel and Dın Rail |
| IP Class | : | IP 40 |
| Probe | : | BD 5400 |
| Connection and Size | : | Threaded - G 1/2''' BSPT (Optionel NPT) |
| Nominal Pressure | : | PN 40 |
| Length | : | 500 mm |
| Max. Operat. Press. | : | 32 Bar (g) |
| Max. Operat. Temp. | : | 239 °C |
| Max. Ambient Temp. | : | 75 °C |
| PT 100 Temperature Sensor Included | ||
| The length of the probe is fixed and cannot be adjusted after production. Therefore, the required length must be specified at the time of order. |
| Valve | : | BKV 5400 |
| Size | : | DN 20, 25, 40 |
| Actuator | : | Electric, Pneumatic (Optional) |
| 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-+230 C |
| Type | : | DG 5400 |
| Nominal Pressure | : | PN 40 |
| Sizes | : | DN 20, DN 25, DN40 |
| Max. Operat. Temp. | : | 239 °C |
| Max. Operat. Press. | : | 32 Bar g |
| Body | : | Nodular Cast Iron, Carbon Steel |
