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A diaphragm valve is a specialized shut-off valve. Its core operation relies on a flexible diaphragm to open and close, which fully isolates the valve body cavity from the bonnet and actuator components, ensuring zero external leakage. Featuring a simple structure consisting of three main components (valve body, diaphragm, and bonnet) with no packing seal, it is extensively applied in fluid control scenarios involving medium-low pressure, highly corrosive media, high-purity fluids, or fluids with suspended solids.
| Parameter Item | Standard Range | Remarks |
|---|---|---|
| Nominal Pressure | PN10~PN16 (1.0~1.6MPa); High-pressure PN25 | Limited by diaphragm resistance |
| Working Temperature | -50℃~200℃ (Subject to material) | PTFE: -100℃~260℃ |
| Nominal Diameter | DN15~DN300 | Commonly used DN≤200 |
| Flow Characteristic | Near quick-opening, linear before 60% stroke | Suitable for quick on-off |
| Connection Type | Flange, Thread, Weld, Clamp | Sanitary grade mostly clamp |



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