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Shanghai Fresi Valve Co., Ltd
Working principle and wide application of electric soft seal butterfly valve
Date: 2025-08-25Read: 4
The working principle of the electric soft seal butterfly valve is mainly based on the cooperation between the valve plate and the elastic sealing ring to achieve fluid control. Its core mechanism includes:
1. Sealing mechanism
A sealing ring made of flexible materials such as EPDM rubber is used to produce elastic deformation through medium pressure or actuator drive when the valve plate is closed, and it tightly adheres to the valve body to achieve bidirectional zero leakage sealing. Positive sealing relies on the medium to push the movable valve seat tightly against the sealing surface, while reverse sealing automatically adjusts the sealing contact surface through the force of the reverse medium.
2. Opening, closing, and adjustment
The actuator drives the valve stem to rotate the butterfly plate 90 ° to complete the switch action. Some models support angle adjustment from 0-70 °, but the linearity of the adjustment is poor, making it more suitable for switch control rather than precise flow regulation.
Electric soft sealed butterfly valves can be widely used in the following fields:
1. Environmental water management: With its advantages of corrosion resistance, lightweight (70% of the weight of hard sealed valves), and low cost, it is widely used in sewage treatment and water supply and drainage systems;
2. Food and chemical industry: suitable for conveying viscous, granular or fibrous media, meeting hygiene and corrosion resistance requirements;
3. Low pressure and high flow scenarios, such as HVAC systems, can be remotely controlled with electric actuators.
Its structural design, such as flange connections and thin-walled valve bodies, simplifies installation and maintenance, while its elastic sealing characteristics make it perform better than hard sealed valves in situations with high sealing requirements.
