Ball valves are mainstream industrial on-off valves, featuring a ball with a through-hole as the closure member. The valve stem drivesll to rotate 90° to achieve flow control, characterized by compact structure, minimal flow resistance, and reliable sealing.
Core Structure and Principle
- Composition: Valve body,, valve stem, seat seal, packing, actuator (handwheel/pneumatic/electric).
- Principle: Through-hole aligned with pipeline = fully open; rotate lock channel with solid face = fully closed; soft seals often achieve zero leakage, while hard seals withstand high temperature and pressure.
Main Classifications
1. Structure: Floating b (medium/low pressure, small/medium bore, low cost), Fixed ball (high pressure, large bore, low torque), Elastic ball (hard sealing for harsh conditions).
2. Dive: Manual, Pneumatic, Electric, Hydraulic.
3. Sealing: Soft seal (PTFE, etc., zero leakage for normal temperature/low pressure), Hard seal (meal-to-metal, wear-resistant for high temperature/high pressure).
4. Passage: Two-way straight-through, Three-way (L-type/T-type for diverting/combining flow).
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