Gestra MK35-2S is a thermostatic diaphragm-regulated bimetallic steam trap designed for condensate discharge in steam systems. The product is equipped with an integral strainer and graphite body sealing, and uses P250GH or ASTM A105 body materials. It provides a maximum allowable differential pressure of 22 barg and a maximum condensate capacity of 1100 kg/h. It supports multiple connection options, including DIN/ANSI flanges, threaded connections, socket-weld ends, and butt-weld ends. It can operate at pressure ratings up to PN40, Class 300, or Class 150, and may be installed in any orientation to meet flexible field drainage requirements.
Gestra thermodynamic diaphragm steam trap MK35-2S three-quarter product view
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MK35-2S Thermostatic Membrane Steam Trap | Gestra
Thermostatic membrane steam trap for condensate discharge in steam systems, available with flanged, threaded, butt-weld and socket-weld connections.
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Specifications
- Steam Trap Type
- Thermostatic, diaphragm regulator
- Nominal Size
- DN25 (1 in)
- Connection Options
- DIN/ANSI flanges, threaded connections, NPT threaded connections, socket-weld ends, butt-weld ends
- Pressure-Temperature Ratings
- PN 40: 40 barg at 20°C, 30.2 barg at 200°C, 25.8 barg at 300°C, 23.1 barg at 400°C; Class 300: 51 barg at 20°C, 43.9 barg at 200°C, 38.9 barg at 300°C, 34.6 barg at 400°C, 28.7 barg at 425°C; Class 150: 19.7 barg at 20°C, 14 barg at 200°C, 10.2 barg at 300°C, 6.5 barg at 400°C, 5.6 barg at 425°C
- Maximum Allowable Differential Pressure
- 22 barg (319 psig)
- Condensate Capacity
- Up to 1100 kg/h (Δp 5 bar)
- Body Material
- P250GH (1.0460 / C22.8) / ASTM A105
- Thermostatic Element Material
- Hastelloy / stainless steel
- Body Sealing Material
- Graphite
- Strainer
- Integral
- Installation Orientation
- Suitable for installation in any orientation
Application scenarios
Condensate Discharge in Steam Systems
Used for condensate discharge in steam system drainage circuits. This thermostatic steam trap is equipped with an integral strainer, provides a maximum allowable differential pressure of 22 barg, and offers a condensate capacity of up to 1100 kg/h (Δp 5 bar).
Installation & maintenance notes
Verification of Material and Process-Medium Compatibility
Before installation and operation, verify the compatibility of the process medium with the graphite sealing and Hastelloy/stainless-steel thermostatic elements used in the product to prevent seal leakage or component corrosion.
FAQ
What is the operating principle of MK35-2S?
MK35-2S is a bimetallic steam trap that uses a thermostatic element driven by the temperature and pressure generated when condensate enters the valve body to discharge condensate while preventing steam loss. An integral strainer ensures that the medium entering the valve body is clean and provides resistance to water hammer.
What is the main difference between MK35-2S and MK35-2S3?
Both are thermostatic steam traps. The difference is that MK35-2S is equipped with two thermostatic elements, whereas MK35-2S3 is equipped with three. Under the same conditions, MK35-2S3 provides a slightly higher maximum flow rate and condensate discharge capacity, making it suitable for applications with higher back pressure and differential pressure.
What connection options are available for this valve?
The valve is available with various connection options, including DIN/ANSI flanges, threaded connections, NPT threaded connections, and socket-weld ends, allowing flexible configuration for different piping systems and installation conditions.
What are the material and sealing characteristics of MK35-2S?
The valve body is made of steel (1.0460). The seat seal uses graphite/CrNi, and the bonnet seal also uses graphite/CrNi. Most internal components are made of stainless steel, providing corrosion resistance and suitability for operation at relatively high temperatures.