What is stainless steel butterfly valve
Aug 01, 2025
A stainless steel butterfly valve is an industrial valve with a stainless steel body and core components. It controls fluid flow or regulates flow by rotating the disc. Its main features and applications are as follows:
1. Core Structure and Material Characteristics
Valve Body Material
Commonly made of 304, 316L, or duplex stainless steel (such as 4A duplex steel), it is resistant to chloride ion corrosion and acid and alkaline media.
Applicable temperature range: -196°C to 425°C (hard seal type).
Sealed design
| Sealing Type | Material/Structure | Applicable Scenarios |
|---|---|---|
| Soft Seal | PTFE or rubber valve seat | Food, medicine and other clean fluids |
| Hard Seal | Multi-layer metal valve seat (such as stainless steel + alloy) | High temperature, corrosive media |
Drive Type
Manual (worm gear handle), pneumatic, electric (0-90° rotary actuator);
Connection Type: Flange (D341W), wafer (D373W), or welded
2. Performance Advantages and Limitations
| Features | Advantages | Limitation |
|---|---|---|
| Corrosion resistance | Resistant to chloride ions, weak acids and alkalis, suitable for seawater desalination and other scenarios | Strong oxidizing acids (such as concentrated nitric acid) require special alloys |
| Sealing level | Hard seal can achieve bidirectional zero leakage (in compliance with ANSI standards) | Soft seals are prone to aging at high temperatures(＞150℃) |
| Flow Control | Linear adjustment characteristics, the butterfly plate opening is proportional to the flow rate | The flow resistance of diameters below DN200 is relatively large |
| Maintenance costs | Hard seal life is more than 10 years, reducing replacement frequency | Repair requires professional disassembly tools |
3. Typical Application Scenarios
Corrosive Media Control
High-Pressure Pipelines in Seawater Desalination Systems, Chemical Acid and Alkali Transportation;
Chlorine-Containing Fluid Interception in Sewage Treatment Plants.
High-Standard Hygiene Applications
Food and Pharmaceutical Clean Pipelines (PTFE Soft Seals);
Sterile Fluid Control in Biological Laboratories.
High-Temperature and High-Pressure Industrial Systems
Power Plant Steam Pipelines (≤425°C);
High-Temperature Oil and Gas Conditioning in Petroleum Refining
