Pneumatic soft seal butterfly valve

Detailed analysis of pneumatic soft seal butterfly valve, comprehensive technical characteristics, application scenarios, and selection suggestions:

1、 Core structure and working principle
The pneumatic soft seal butterfly valve consists of a valve body, a butterfly plate, a soft seal valve seat, and a pneumatic actuator. The butterfly plate is driven to rotate from 0 ° to 90 ° by the actuator to achieve opening and closing or flow regulation. The sealing pair adopts elastic materials (such as nitrile rubber NBR, fluororubber FKM or polytetrafluoroethylene PTFE), which rely on material deformation to fill the gap and achieve zero leakage.
Key design:
Eccentric structure: Medium line or double eccentric design reduces opening and closing friction and extends sealing life.
T-shaped sealing ring: multi-layer stainless steel sheet combined with soft material to enhance the anti erosion ability.
2、 Technical parameters and performance
Parameter specification range remarks
Nominal diameter DN50~DN2000 clamp/flange connection optional
Pressure rating PN0.6~1.6MPa, some models support PN2.5MPa
Suitable temperature -40 ℃~200 ℃ (depending on the sealing material) Fluororubber has better temperature resistance than nitrile rubber
Drive mode: Pneumatic (single/double acting), can be equipped with a locator to achieve 4-20mA control
Performance advantages:
Bidirectional sealing: It can maintain zero leakage in both forward and reverse flow conditions.
Low flow resistance: The streamlined design of the butterfly plate results in a pressure loss that is only one-third of that of a gate valve.
3、 Typical application areas
Water treatment system: used for opening and closing control of clean water and sewage pipelines.
Food and medicine: PTFE sealing material that meets hygiene standards is suitable for sterile environments.
Urban gas: Nitrile rubber seals meet the requirements for natural gas transportation.

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