1. Abbreviations
- 2P refers to 2-piece valve with top flange.
- 3P refers to 3-piece valve with top flange.
2. Differences
| Characteristic | 2P | 3P |
|---|---|---|
| Number of bolts | None (single-piece body) | Multiple (bolted sections) |
| Disassembly capability | Not possible | Possible (removable central part) |
| Suitable application | Basic systems with low maintenance | Systems needing regular maintenance |
| Body structure | Higher (solid body) | Modular (replaceable parts) |
| Size and weight | Compact and lightweight | Bulkier and heavier |
3. Repair Types
| Type of repair | Via top flange (stem disassembly) | Via bolt disassembly (body) | Repair frequency (in residential water systems) |
|---|---|---|---|
| Stem seal replacement | Yes | No | Once every 5-7 years |
| Stem replacement | Yes | No | Rare, once every 10-15 years |
| Ball element maintenance | No | Yes | Once every 7-10 years |
| Ball seat replacement | No | Yes | Once every 7-10 years |
| Internal cleaning of the valve | No | Yes | As needed, about once every 5-7 years |
| Ball replacement | No | Yes | Rare, once every 10-15 years |
| Inspection and replacement of seats | No | Yes | Once every 7-10 years |