The valve body of a three-piece ball valve is composed of a main body and two sub-bodies, so it is called a three-piece ball valve. After the spool and stem are mounted into the main valve body, the sub-body is mounted into the valve seat, and the main and sub-bodies are bolted together as one. The spool flow path is also full bore size.
3 Piece Ball Valves Specification
| Size Range | 1/2"-4", DN15-DN100 |
| Pressure Rating | 1000WOG, 2000WOG |
| End Connection | Flange (FF RF), BW, SW, BSPT, NPT |
| Structure Style | Full Port, 3 Pieces |
| Actuator Options | Manual, Pneumatic, Electric |
| Temperature Range | -20°C~150°C |
| Connection Standard | Flange Drilling: ASME B16.5.ASME B16.47.GB/T 9113.JB/T 79 Butt Weld: ASME B16.25,GB/T 12224 |
| Body Material | CF8,CF8M,CF3,CF3M |
| Ball Material | SS304, SS316, SS304L, SS316l |
| Seat Material | PTFE, RPTFE |
| Stem Material | SS304, SS316 |
| Design Standard | ANSI B16.34, GB/T 12234 |
| Face to Face Standard | ASME B16.10, GB/T 12221, JIS B2002 |
| Test Standard | API 598, GB/T 13927, EN12266-1 |
3 piece stainless Steel ball valves


Three-piece ball valve has the following advantages:
1. Small fluid resistance, its resistance coefficient is equal to the same length of the pipe section.
2. Simple structure, small size, light weight.
3. Compact and reliable, the current sealing surface of the ball valve materials are widely used in plastic, good sealing, in the vacuum system has also been widely used.
4. Easy to operate, open and close quickly, from fully open to fully closed as long as the rotation of 90 °, easy to control from a distance.
5. Convenient maintenance, ball valve structure is simple, the seal is generally active, disassembly and replacement are relatively convenient.
6. in fully open or fully closed, the ball and the sealing surface of the valve seat and the media isolation, the media through, will not cause erosion of the valve sealing surface.
7. Wide range of application, the diameter from small to several millimeters, large to several meters, from high vacuum to high pressure can be applied.
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