1. Short designations
For simplicity, we will refer to these valves as follows:
- «2-piece valve» («İki parçalı vana») refers to «Unox 3/4" iki parçalı paslanmaz dişli küresel vana» («Unox 3/4" 2-piece threaded stainless steel ball valve») with the designation Q11F-64P.
- «2-piece valve with top flange» («İki parçalı tepe flanşlı vana») refers to «Unox 3/4" iki parçalı tepe flanşlı paslanmaz dişli küresel vana» («Unox 3/4" 2-piece threaded stainless steel ball valve with top flange») with the same designation Q11F-64P.
- «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») refers to «Unox 3/4" üç parçalı tepe flanşlı paslanmaz dişli küresel vana» («Unox 3/4" 3-piece threaded stainless steel ball valve with top flange»).
2. Common characteristics
The following characteristics are identical for all three products:
| Feature | Common value |
|---|---|
| Material | Body: CF8/CF8M, Seat: PTFE (Teflon) |
| Sealing materials | PTFE (Teflon) |
| Connection type | Threaded BSP |
| Operating temperature range | -20°C to 180°C |
| Size range (Nominal diameter - DN) | DN15 (1/2”) – DN100 (4”) |
| DN (Nominal diameter) | 20 mm |
| D (Inner diameter) | 20 mm |
| L (Length) | 74-80 mm |
| H (Height) | 64-68 mm |
| T (Handle size) | 110-123 mm |
| Weight (kg) | 0.286-0.412 kg |
| Application areas | Water, gas, and liquid systems |
| Handle and cover | Stainless steel handle with PVC cover |
3. Differences between the valves
The following table outlines the key differences between the three valves:
| Feature | 2-piece valve («İki parçalı vana») | 2-piece valve with top flange («İki parçalı tepe flanşlı vana») | 3-piece valve with top flange («Üç parçalı tepe flanşlı vana») |
|---|---|---|---|
| Number of parts | 2-part construction | 2-part construction | 3-part construction |
| Designation | Q11F-64P | Q11F-64P | No specific designation |
| Flange (Tepe flanşlı) | No | Yes | Yes |
| Ease of maintenance | Standard (requires full removal for repair) | Standard | Easier maintenance due to 3-part design |
| Max pressure | 6.4 MPa | 6.4 MPa | 13 MPa |
| Durability and sealing | Standard | Enhanced due to flange | Enhanced due to flange and 3-part construction with tight sealing using PTFE |
| Material (stem and ball) | Standard (stainless steel) | Upgraded stem: SS316 | Upgraded ball and stem: SS304/SS316 |
| Application areas (additional) | - | - | Steam, chemical, and food industry applications |
4. Key differences
4.1. Flange (Tepe flanşlı)
The «2-piece valve with top flange» («İki parçalı tepe flanşlı vana») and «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») both have a flange, which provides additional stability and better sealing compared to the «2-piece valve» («İki parçalı vana»), which does not have a flange.
The flange ensures a tighter, more reliable connection, especially in systems with high pressure or temperature fluctuations.
However, it is important to note that the presence of a flange does not mean the valve does not use threaded connections.
Both valves still utilize threaded connections (denoted as «DİŞLİ» in Turkish), while the flange adds stability and improves sealing performance.
In chemical or steam applications, this added flange becomes crucial for system longevity.
4.2. Number of parts
The «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») has a 3-part construction, which simplifies maintenance and repair compared to the 2-part construction of the other models.
In a 3-part valve, the central section can be removed for maintenance without needing to disassemble the entire valve from the piping system, a significant advantage when quick repairs are needed in critical systems like steam or chemical pipelines.
4.3. Material and durability
While both 2-piece valve models use CF8/CF8M stainless steel for the body, the 2-piece valve with top flange features an upgraded SS316 stem, providing better corrosion resistance for aggressive environments like chemical or food processing industries.
The «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») also utilizes SS304/SS316 for the ball and stem, enhancing its durability under pressure and temperature fluctuations.
4.4. Sealing and application areas
The «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») is equipped with PTFE (Teflon) seals, offering tight, low-torque sealing even at high pressures.
Its versatility allows it to handle steam, chemical, and food industry applications, unlike the simpler 2-part valves, which are primarily suited for water, gas, and liquid systems.
This valve also meets more stringent industrial requirements, making it ideal for demanding applications where tight sealing and durability are critical.
4.5. Pressure and temperature
The «2-piece valve» («İki parçalı vana») and «2-piece valve with top flange» («İki parçalı tepe flanşlı vana») both operate at a maximum pressure of 6.4 MPa, while the «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») can handle up to 13 MPa, making the latter more suitable for high-pressure environments.
All three valves operate in a temperature range of -20°C to 180°C, making them versatile for various industrial applications.
4.6. Advantages of the 3-part design
One of the key advantages of the «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») is its easy maintenance.
Due to its 3-part construction, the valve allows for the replacement of internal components like seals or the ball without shutting down the entire system.
This feature is particularly useful in environments where maintenance must be performed without interrupting the flow of liquids or gases.
5. The meaning of "threaded" and "flange"
5.1. What does "threaded" mean?
In the case of the «2 PIECES THREADED STAINLESS STEEL BALL VALVE» (referred to as Q11F-64P), the term «threaded» refers to the use of threaded connections (in Turkish, «DİŞLİ») to attach the valve to the piping system.
Threaded connections allow for easy installation and removal without welding or soldering, providing a secure and sealed connection through the threading of the valve and the pipe.
In Turkish, the term «DİŞLİ» directly translates to "threaded."
5.2. What does "flanşlı" mean?
In the titles of «2-piece valve with top flange» («İki parçalı tepe flanşlı vana») and «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana»), the word «FLANŞLI» refers to the presence of a flange.
In these valves, the flange provides extra mechanical support and sealing, but it does not replace the threaded connection.
The flange is an added feature for improved stability, but the valve still relies on threaded connections for installation into the piping system.
6. Conclusion
Choosing between these valves depends on your specific needs.
If you need a basic valve for water or gas systems, the «2-piece valve» («İki parçalı vana») will suffice.
If you require extra stability and better sealing, the «2-piece valve with top flange» («İki parçalı tepe flanşlı vana») is a good option.
For more complex systems, including steam or chemical applications, and if easier maintenance is a priority, the «3-piece valve with top flange» («Üç parçalı tepe flanşlı vana») would be the ideal choice.