Threaded ball valve, three-piece

It is a high-performance valve composed of left valve body, right valve body and middle valve body connected by bolts or threads, suitable for occasions that require high sealing, easy maintenance and high pressure resistance. Compared with one-piece and two-piece ball valves, its design is more complex, but it is easier to maintain and clean, and it is widely used in industrial piping systems.

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Product Details

1. Design features
● Three-piece Design: Consists of left valve body, right valve body and intermediate valve body (including valve seat and ball), which are bolted for easy disassembly and maintenance.

● Threaded connection: Both ends are connected by female thread (BSP, NPT, etc.) or male thread, suitable for small and medium-sized pipes (DN15-DN100).

● Fixed ball design (some models): The ball is fixed by the upper and lower valve stem to reduce the impact of medium pressure on the sealing surface and improve pressure resistance.

● Double seal: The valve seat usually uses PTFE (polytetrafluoroethylene) or metal solid seal to ensure zero leakage.

● Anti-blowout valve stem design: suitable for high-pressure environments to prevent accidental disconnection of the valve stem.

2. Principle of operation
● Opening: The handle or actuator is rotated 90°, the through-hole of the ball aligns with the pipeline, and the liquid passes through.

● Closure: The ball is rotated 90°, the through-hole is perpendicular to the pipeline, and the liquid is cut off.

● Flow Adjustment (Some Models): Flow control can be achieved by partial rotation.

3. Main advantages
✅ High sealing: Soft seal (PTFE) or metal solid seal, suitable for heavy-duty applications.
✅ Easy maintenance: The three-piece design can be completely disassembled, which is convenient for replacing vulnerable parts such as valve seats and balls.
✅ High Pressure Resistance: The fixed ball design is suitable for PN16-PN100 or even higher pressures.
✅ Long service life: High-quality materials (e.g., 304/316 stainless steel) are corrosion-resistant and suitable for chemical, petroleum, and other industries.
✅ Wide range of applicable media: water, steam, oil, gas, corrosive liquids, etc.

4. Areas of application
● Oil and gas: oil pipelines, natural gas control.

● Chemistry and pharmaceuticals: acid and alkaline media, control of high-purity liquids.

● Energy: high-temperature steam, cooling system.

● Food Processing: Sanitary stainless steel meets FDA standards.

● Water treatment and HVAC: water supply and sanitation, HVAC system.