Understanding the differences between Venturi valves and butterfly valves is critical for selecting the right flow-control solution. This guide compares their structures, applications, costs, and more.
What is a Venturi Valve
A Venturi valve is a precision flow-control device designed to maintain constant airflow or liquid flow rates using the Venturi effect. It features a tapered throat that accelerates fluid while reducing pressure, enabling accurate regulation without moving parts.
What is a Butterfly Valve
A butterfly valve is a quarter-turn rotary valve with a circular disc mounted on a rotating shaft. It controls flow by positioning the disc perpendicular (closed) or parallel (open) to the medium. It is simple, cost-effective, and ideal for quick shut-off applications.
Structure & Working Principle
Venturi Valve
- Structure: Tapered tube with a narrow throat, pressure ports, and no moving parts.
- Principle: Uses Bernoulli’s principle—fluid accelerates in the throat, creating a pressure drop to regulate flow.
Butterfly Valve
- Structure: Circular body, rotating disc, shaft, and actuator (manual or automated).
- Principle: Disc rotation adjusts flow; 90° turn fully opens or closes the valve.
Control Characteristics
| Feature | Venturi Valve | Butterfly Valve |
| Precision | High (constant flow) | Moderate (on/off or basic regulation) |
| Response Speed | Passive (no actuation needed) | Fast (quick quarter-turn operation) |
| Pressure Drop | Low | Higher (due to disc obstruction) |
Application Scenarios
Venturi Valve
- Laboratories (fume hoods, cleanrooms).
- HVAC systems requiring stable airflow.
- Chemical dosing with precise flow rates.
Butterfly Valve
- Water treatment plants.
- Large pipelines (oil, gas, water).
- Industrial processes needing rapid shut-off.
Maintenance Costs
- Venturi Valve: Low maintenance (no moving parts). Higher initial price due to precision engineering.
- Butterfly Valve: Affordable upfront cost. May require periodic disc/seal replacements.
Installation Space
- Venturi Valve: Compact linear design, fits into tight spaces.
- Butterfly Valve: Requires clearance for disc rotation; bulkier in large sizes.
Top Manufacturers in China
China hosts leading manufacturers of both valves:
- Venturi Valves: ABC Flow Tech, Shanghai Valve Solutions.
- Butterfly Valves: Zhejiang Danfoss Valve, China Yuanda Valve Group, NSW Valve Manufacturer
Comparison Summary Table
| Aspect | Venturi Valve | Butterfly Valve |
| Design | No moving parts, tapered throat | Rotating disc, compact body |
| Precision | High | Moderate |
| Cost | Higher initial price | Lower initial price |
| Maintenance | Minimal | Periodic seal/disc checks |
| Best For | Precision flow control | Quick shut-off, large pipelines |
Conclusion
Venturi valves excel in precision and low maintenance, while butterfly valves offer affordability and rapid operation. When choosing, consider flow requirements, budget, and space. For competitive prices, explore manufacturers in China specializing in industrial valves.
Post time: Mar-27-2025