GESTRA BK 45 & BK 46 | PN40 | DN 15 20 25

Steam Traps

GESTRA BK 45 & BK 46 Steam Traps | PN40 | DN 15 20 25
GESTRA BK 45 & BK 46 Steam Traps | PN40 | DN 15 20 25
GESTRA BK 45 & BK 46 Steam Traps | PN40 | DN 15 20 25
GESTRA BK 45 & BK 46 Steam Traps | PN40 | DN 15 20 25
GESTRA BK 45 & BK 46 Steam Traps | PN40 | DN 15 20 25

GESTRA BK 45 & BK 46 Steam Traps | PN40 | DN 15 20 25

When the plant is started up, the trap is fully open. Cold condensate and air are discharged. With rising temperature, the Duo (bimetallic) stainless steel plates bend and pull the stage nozzle into the closing position.

The orifice is then closed immediately below the saturation temperature. Thermodynamic processes taking place in the stage-nozzle chamber support the closing procedure.

The trap provides automatic air-venting at start-up and during operation. BK 45 and BK 46 can also be used for thermal air-venting in steam systems.

  • Flange EN 1092-1 B1 PN 40
  • Flange ASME B 5 Class 150 RF, 300 RF
  • Screwed sockets G: ISO 228-1
  • Screwed sockets NPT: ASME B 11
  • Socket-weld ends DIN EN 12760
  • Socket-weld ends ASME B 11 Class 3000
  • Butt-weld ends via transition pieces to EN 12627 welded joint geometry ISO 9692-1 code number 1.3 (30° chamfer)
  • Butt-weld ends via transition pieces ASME B 16.25 ASME B 36.10
BK 45, BK 45-U, flanged PN 40, EN 1092-1
PMA (max. allowable pressure)                         [bar]g 40.0 33.3 27.6 25.7 23.8 17.1
TMA (max. allowable temperature)                        [°C] 20 200 300 350 400 420
? PMX (admissible differential pressure)            [bar] 22

Based on EN 1092-1

BK 45, BK 45-U, flanged Class 150, ASME B16.5
PMA (max. allowable pressure)                         [bar]g 19.6 13.8 10.2 8.4 6.5 5.5
TMA (max. allowable temperature)                        [°C] –29/38 200 300 350 400 425
? PMX (admissible differential pressure)            [bar] 19.6

Based on ASME B16.5, ASME B16.34

BK 45, BK 45-U, flanged Class 300, ASME B16.5, butt-weld ends EN 12627, socket-weld ends EN 12760, socket-weld ends Class 3000, ASME B16.11, screwed sockets G, ISO 228-1, screwed sockets NPT, ASME B16.11
PMA (max. allowable pressure)                         [bar]g 51.1 43.8 39.8 37.6 34.7 28.8
TMA (max. allowable temperature)                         [°C] –29/38 200 300 350 400 425
? PMX (admissible differential pressure)             [bar] 22

Based on ASME B16.5, ASME B16.34

BK 45-LT, flanged Class 150, ASME B16.5
PMA (max. allowable pressure)                         [bar]g 19.6 13.8 10.2 8.4 6.5 5.5
TMA (max. allowable temperature)                        [°C] –46 200 300 350 400 425
? PMX (admissible differential pressure)            [bar] 22

Based on ASME B16.5, ASME B16.34

BK 45-LT, flanged Class 300, ASME B16.5, butt-weld ends EN 12627, socket-weld ends EN 12760,

socket-weld ends Class 3000, ASME B16.11, screwed sockets G, ISO 228-1, screwed sockets NPT, ASME B16.11
PMA (max. allowable pressure)                         [bar]g 51.1 43.8 39.8 37.6 34.7 28.8
TMA (max. allowable temperature)                         [°C] –46 200 300 350 400 425
? PMX (admissible differential pressure)             [bar] 22

Based on ASME B16.5, ASME B16.34

BK 46, flanged PN 40, EN 1092-1
PMA (max. allowable pressure)                         [bar]g 40.0 39.0 34.2 32.3 29.9 27.6
TMA (max. allowable temperature)                        [°C] 20 250 300 350 400 450
? PMX (admissible differential pressure)            [bar] 32

Based on EN 1759-1

BK 46, flanged Class 150, ASME B16.5
PMA (max. allowable pressure)                         [bar]g 20.0 14.0 10.2 8.4 6.5 4.7
TMA (max. allowable temperature)                        [°C] –10/50 200 300 350 400 450
? PMX (admissible differential pressure)            [bar] 32

Based on EN 1759-1

BK 46, flanged Class 300, ASME B16.5, butt-weld ends EN 12627, socket-weld ends EN 12760,

socket-weld ends Class 3000, ASME B16.11, screwed sockets G, ISO 228-1, screwed sockets NPT, ASME B16.11
PMA (max. allowable pressure)                         [bar]g 51.7 44.2 35.0 32.9 30.9 29.8
TMA (max. allowable temperature)                         [°C] –10/50 200 300 350 400 450
? PMX (admissible differential pressure)             [bar] 32

Based on EN 1759-1

GESTRA BK 45 & BK 46 | PN40 | DN 15 20 250

Steam Traps

GESTRA: The Ultimate Solution for Industrial Steam & Fluid Control Systems

Efficient steam trap performance is critical to energy efficiency, process stability, and equipment protection. The GESTRA BK 45 and BK 46 Steam Traps are engineered for PN 40 steam systems, delivering precise condensate discharge, minimal live steam loss, and long service life.

Available in DN 15, DN 20, and DN 25 (1/2”, 3/4”, 1”), the BK 45 / BK 46 series is a proven choice for industrial steam distribution and process applications worldwide.

Product Series:

  • GESTRA BK 45
  • GESTRA BK 45-U
  • GESTRA BK 45-LT
  • GESTRA BK 46

Pressure Rating:

  • PN 40

Nominal Sizes:

  • DN 15 (½”)
  • DN 20 (¾”)
  • DN 25 (1”)

Steam Trap Type:

  • Thermodynamic / Duo-type design

✅ Efficient Condensate Discharge

The advanced thermodynamic design ensures fast removal of condensate, preventing water hammer and maintaining optimal heat transfer.

✅ Low Live Steam Loss

Optimized internal geometry minimizes steam loss, resulting in lower energy consumption and reduced operating costs.

✅ Robust Construction for Industrial Use

Manufactured from high-quality materials to withstand high pressure, temperature variations, and harsh operating environments.

✅ Reliable Operation Under Variable Conditions

Performs consistently during start-up, part-load, and full-load operation.

✅ Low Maintenance & Long Service Life

Simple, durable construction ensures minimal maintenance requirements and long-term reliability.

Feature BK 45 Series BK 46
Pressure Rating PN 40 PN 40
Application General steam systems Higher capacity / duty
Condensate Capacity High Very High
Installation Size DN 15–25 DN 15–25
Model Key Feature Application
BK 45 Standard version General industrial steam
BK 45-U Universal installation Flexible piping layouts
BK 45-LT Low-temperature operation Start-up & tracing lines
BK 46 Higher capacity Demanding steam loads

GESTRA BK 45 & BK 46 Steam Traps are widely used in:

  • Steam distribution lines
  • Heat exchangers
  • Process heating equipment
  • Steam tracing systems
  • Power plants
  • Chemical & petrochemical industries
  • Food & beverage processing
  • Pharmaceutical manufacturing

✔ Proven German engineering
✔ Global industrial references
✔ High safety and quality standards
✔ Reduced energy and maintenance costs
✔ Long-term operational reliability

Choosing original GESTRA BK 45 & BK 46 Steam Traps ensures optimal performance and system protection.

Feature GESTRA BK 45 / BK 46 Conventional Trap
Condensate Discharge Fast & stable Inconsistent
Steam Loss Very low Often high
Reliability Excellent Variable
Maintenance Minimal Frequent
Service Life Long Shorter

We supply 100% genuine GESTRA steam traps with full technical support.

📩 Contact us today for:

  • Latest pricing

  • Datasheets & technical documentation

  • Model selection assistance

  • Fast delivery & after-sales service

🚚 Worldwide shipping
🔧 Expert steam system consultation
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