The Gestra MK35/2S3 is a thermostatic steam trap with a nominal size of DN25, equipped with three 5H2 thermostatic elements and a corrosion-resistant diaphragm regulator. The product features a P250GH steel body, an integral strainer, and multiple connection options, including flanged, threaded, and welded connections. It supports a maximum allowable differential pressure of 22 barg and can be installed in any position. This steam trap is specifically designed for condensate discharge in steam systems, with a maximum discharge capacity of 1700 kg/h at Δp 5 bar.
Gestra thermostatic steam trap MK35/2S3 product photo, three-quarter angle view
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MK35/2S3 Thermostatic Steam Trap | Gestra
Thermostatic diaphragm-regulated steam trap with three 5H2 elements for condensate discharge in steam systems, DN25.
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Specifications
- Steam Trap Type
- Thermostatic steam trap with corrosion-resistant diaphragm regulator
- Thermostatic Element Configuration
- Three 5H2 thermostatic elements
- Condensate Discharge Capacity
- Maximum 1700 kg/h (Δp 5 bar)
- Maximum Allowable Differential Pressure
- 22 barg (319 psig)
- Nominal Size
- DN25 (1 in)
- Connection Options
- DIN/ANSI flanges, threaded connections, NPT threaded connections, socket-weld ends, butt-weld ends
- PN40 Pressure-Temperature Ratings
- 40 barg@20°C; 30.2 barg@200°C; 25.8 barg@300°C; 23.1 barg@400°C
- ASME Class 300 Pressure-Temperature Ratings
- 51 barg@20°C; 43.9 barg@200°C; 38.9 barg@300°C; 34.6 barg@400°C; 28.7 barg@425°C
- ASME Class 150 Pressure-Temperature Ratings
- 19.7 barg@20°C; 14 barg@200°C; 10.2 barg@300°C; 6.5 barg@400°C; 5.6 barg@425°C
- Body Material
- P250GH (1.0460 / C22.8) steel, ASTM A105
- Sealing Material
- Graphite/CrNi
- Thermostatic Element Materials
- Hastelloy / stainless steel
- Integral Strainer
- With integral strainer
- Installation Orientation
- Can be installed in any position
Application scenarios
Condensate Discharge in Steam Systems
Designed for condensate discharge in steam systems. This model is a thermostatic steam trap with a maximum allowable differential pressure of 22 barg, a nominal size of DN25, and an integral strainer.
Installation & maintenance notes
Maintenance of Integral Strainer and Seals
During maintenance or servicing, inspect and clean the integral strainer and check the condition of the seals. Replace the seals when necessary to maintain normal steam trap operation and prevent leakage.
FAQ
What operating principle does Gestra MK35/2S3 use, and which media is it suitable for?
MK35/2S3 is a thermostatic steam trap for condensate discharge in steam systems. It uses a corrosion-resistant diaphragm regulator and is equipped with three 5H2 thermostatic elements. It is designed to discharge condensate from steam systems, and the product documentation also states that it is unaffected by water hammer.
How should the capacity and permissible differential pressure of MK35/2S3 be considered for selection?
At a differential pressure Δp of 5 bar, this model has a maximum condensate capacity of 1700 kg/h; the maximum permissible differential pressure is 22 barg. Selection should take into account the steam pressure, back pressure, actual condensate load, and installation location. The model should not be selected solely on the basis of nominal size or a single capacity value.
What are the main differences between Gestra MK35/2S3 and MK35/2S?
Both are DN25 thermostatic steam traps, but they differ in the number of thermostatic elements and capacity. MK35/2S is equipped with two 5H2 thermostatic elements and has a maximum capacity of 1100 kg/h at Δp 5 bar. MK35/2S3 is equipped with three 5H2 thermostatic elements and has a maximum capacity of 1700 kg/h at the same differential pressure. For applications with higher condensate loads, MK35/2S3 provides greater discharge capacity.
Which pipeline connection options are available for MK35/2S3, and are there any installation orientation restrictions?
MK35/2S3 has a nominal size of DN25 (1 in) and is available with DIN/ANSI flanges, threaded connections, NPT threaded connections, socket-weld ends, and butt-weld ends to suit different pipeline interfaces. The trap may be installed in any position. The applicable pipeline connection standard, available installation space, and condensate drainage point layout should nevertheless be verified on site.
How should the pressure-temperature ratings of MK35/2S3 be verified?
The pressure-temperature rating must be verified according to the selected connection class and the actual inlet temperature. The PN40 version is rated at 40 barg at 20°C and 23.1 barg at 400°C. The ASME Class 300 version is rated at 51 barg at 20°C and 28.7 barg at 425°C. The ASME Class 150 version is rated at 19.7 barg at 20°C and 5.6 barg at 425°C. Regardless of the connection type, the operating differential pressure must not exceed the maximum permissible differential pressure of 22 barg.