GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½”, ¾”, 1″)

Steam Trap

GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap
GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½", ¾", 1") Steam Trap

GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½”, ¾”, 1″) Steam Trap

Thermostatic steam trap with corrosion-resistant thermostatic capsule. With Y-type strainer and integrated water hammer protection. Do not expose the control membrane capsule to superheat conditions above 5°C.

Steam traps with standard capsule “N” discharge condensate with approx. 10 K below boiling temperature, traps with capsule “U” with an undercooling of approx. 30 K and traps with capsule “H” with approx. 5 K undercooling.

MK 45-1, MK 45A-1 with tandem seat (double sealing)

Particularly for low condensate flowrates. Optionally with standard capsule 5N1 or special capsule 5U1 or 5H1.

MK 45-2, MK 45A-2 with single seat

For larger condensate flowrates. Optionally with standard capsule 5N2 or special capsule 5U2 or 5H2.

MK 45, flanged PN 40, EN 1092-1
Pressure1) p [barg] 40.0 37.1 33.3 30.4 27.6 25.7 23.8 17.1
Temperature1) T [°C] -10/20 100 200 250 300 350 400 420
Max. admissible differential pressure ∆PMX [bar] / [psi] 32 / 465
Admissible service temperature Saturated steam temperature
Pressure1) p [psig] 580 537.95 483 441 400 373 345 190
Temperature1) T [°F] 14/68 212 392 482 572 662 752 842

1) Resistance limits for body/cover to EN 1092-1

MK 45, flanged Class 150, ASME B16.5
Pressure1) p [barg] 19.6 17.7 13.8 12.1 10.2 8.4 6.5 5.5
Temperature1) T [°C] -29/38 100 200 250 300 350 400 425
Max. admissible differential pressure ∆PMX [bar] / [psi] 19.6 / 284
Admissible service temperature Saturated steam temperature
Pressure1) p [psig] 284 256.65 200 175 148 122 94 80
Temperature1) T [°F] -20/100 212 392 482 572 662 752 797

1) Resistance limits for body/cover to ASME B 16.5

MK 45, 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 BSP, ISO 228-1, screwed sockets NPT, ASME B16.11
Pressure1) p [barg] 51.1 46.6 43.8 41.9 39.8 37.6 34.7 28.8
Temperature1) T [°C] -10/38 100 200 250 300 350 400 425
Max. admissible differential pressure ∆PMX  [bar] / [psi] 32 / 465
Admissible service temperature Saturated steam temperature
Pressure1) p [psig] 741 675.7 635 608 577 545 503 418
Temperature1) T [°F] -20/100 212 392 482 572 662 752 797

1) Resistance limits for body/cover to ASME B 16.5

MK 45A, flanged PN 40, EN 1092-1
Pressure1) p [barg] 40 37.2 31.8 29.9 27.6 26.4 25.7 –
Temperature1) T [°C] -10/20 100 200 250 300 350 400 –
Max. admissible differential pressure ∆PMX  [bar] / [psi] 32 / 465
Admissible service temperature Saturated steam temperature
Pressure1) p [psig] 580 539.4 461 434 400 383 373 –
Temperature1) T [°F] 14/68 212 392 482 572 662 752 –

1) Resistance limits for body/cover to EN 1092-1
If the operating temperatures exceed 300°C intercrystalline corrosion may occur. Do not subject the equipment to operating temperatures higher than 300° C unless intercrystalline corrosion can be ruled out.

MK 45A, flanged Class 150, ASME B16.5
Pressure1) p [barg] 15.9 13.3 11.2 10.5 10 8.4 6.5 –
Temperature1) T [°C] -29/38 100 200 250 300 350 400 –
Max. admissible differential pressure ∆PMX  [bar] / [psi] 15.9 / 284
Admissible service temperature Saturated steam temperature
Pressure1) p [psig] 231 200.1 162 152 145 122 94 –
Temperature1) T [°F] -20/100 212 392 482 572 662 752 –

1) Resistance limits for body/cover to EN 1092-1
If the operating temperatures exceed 300°C intercrystalline corrosion may occur. Do not subject the equipment to operating temperatures higher than 300° C unless intercrystalline corrosion can be ruled out.


MK 45A, 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 BSP, ISO 228-1, screwed sockets NPT, ASME B16.11
Pressure1) p [barg] 41.4 34.8 29.2 27.5 26.1 25.1 24.3 –
Temperature1) T [°C] -10/38 100 200 250 300 350 400 –
Max. admissible differential pressure ∆PMX  [bar] / [psi] 32 / 465
Admissible service temperature Saturated steam temperature
Pressure1) p [psig] 600 504.6 423 399 378 364 352 –
Temperature1) T [°F] -20/100 212 392 482 572 662 752 –

1) Resistance limits for body/cover to ASME B 16.5

If the operating temperatures exceed 300°C intercrystalline corrosion may occur. Do not subject the equipment to operating temperatures higher than 300° C unless intercrystalline corrosion can be ruled out.

GESTRA MK 45-1, MK 45-2, MK 45A-1, MK 45A-2 PN 40 / Class 300 DN 15, 20, 25 (½”, ¾”, 1″)

Steam Trap

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

High-Performance Steam Trap for Industrial Steam Systems

The GESTRA MK 45 Steam Trap series is a premium solution for efficient condensate discharge in high-pressure steam systems. Designed and manufactured by GESTRA AG (Germany), the MK 45-1, MK 45-2, MK 45A-1, and MK 45A-2 models are widely trusted across power plants, oil & gas facilities, chemical industries, food processing plants, and manufacturing facilities worldwide.

With PN 40 / ASME Class 300 pressure rating and sizes DN 15, DN 20, DN 25 (½”, ¾”, 1″), the GESTRA MK 45 steam trap delivers maximum reliability, energy efficiency, and long service life even in the most demanding steam applications.

✔ German Engineering Quality

GESTRA is globally recognized for producing high-precision steam and condensate management equipment. The MK 45 series reflects decades of engineering excellence.

✔ High Pressure & High Temperature Capability

Designed for PN 40 / Class 300 steam systems, making it ideal for industrial high-pressure steam applications.

✔ Automatic Condensate Discharge

Ensures continuous removal of condensate without steam loss, improving system efficiency and reducing operational costs.

✔ Robust & Maintenance-Friendly Design

Durable construction with minimal moving parts, reducing downtime and maintenance expenses.

🔹 GESTRA MK 45-1 Steam Trap

  • Standard version for saturated steam applications

  • Reliable operation under stable pressure conditions

  • Ideal for heat exchangers, steam mains, and process equipment

🔹 GESTRA MK 45-2 Steam Trap

  • Enhanced performance for varying pressure conditions

  • Improved discharge capacity

  • Suitable for dynamic industrial steam systems

🔹 GESTRA MK 45A-1 Steam Trap

  • Advanced design with optimized flow characteristics

  • Excellent air venting performance

  • Ideal for startup conditions and rapid heating processes

🔹 GESTRA MK 45A-2 Steam Trap

  • Highest performance model in the MK 45 series

  • Handles fluctuating loads and high condensate volumes

  • Perfect for critical steam applications requiring maximum reliability

Specification Details
Product Type Thermodynamic Steam Trap
Models MK 45-1, MK 45-2, MK 45A-1, MK 45A-2
Pressure Rating PN 40 / ASME Class 300
Nominal Sizes DN 15, DN 20, DN 25
Inch Sizes ½”, ¾”, 1″
Connection Type Flanged
Material High-grade alloy steel
Application Steam systems, condensate drainage

  • Power generation plants

  • Oil & gas refineries

  • Petrochemical and chemical plants

  • Food & beverage processing

  • Pharmaceutical industries

  • Paper & pulp manufacturing

  • Heat exchangers

  • Steam pipelines and distribution networks

🔥 Improved Energy Efficiency

Prevents live steam loss, significantly reducing fuel and energy consumption.

🔧 Extended Equipment Life

Effective condensate removal protects steam equipment from water hammer and corrosion.

💰 Lower Operating Costs

Reduced maintenance, improved system efficiency, and longer service intervals.

🌍 Environmentally Friendly

Optimized steam utilization contributes to lower carbon emissions.

  • ✔ Genuine GESTRA products (Original & Certified)

  • ✔ Competitive pricing for industrial projects

  • ✔ Expert technical support and consultation

  • ✔ Fast delivery for DN 15, DN 20, DN 25 sizes

  • ✔ Suitable for PN 40 / Class 300 steam systems

We supply GESTRA MK 45-1, MK 45-2, MK 45A-1, and MK 45A-2 steam traps for both replacement and new installations, ensuring optimal performance for your steam system.

If you are looking for a high-quality, reliable, and energy-efficient steam trap, the GESTRA MK 45 Steam Trap series is the ideal choice.

📩 Contact us now for:

  • Latest price

  • Technical datasheet

  • Stock availability

  • Project and bulk order support

Optimize your steam system with GESTRA MK 45 – the trusted solution for high-pressure steam applications.

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