Centre Line Sealing Butterfly Valve

Medium line seal butterfly valve is a type of butterfly valve with medium line symmetrical structure as the core, whose stem axis, butterfly plate centre and valve body centre line coincide, and through the rotation of the butterfly plate to achieve the pipeline on-off control and flow adjustment. Through the rotation of the butterfly plate to achieve pipeline control and flow adjustment, mainly relying on soft sealing materials (such as rubber, polytetrafluoroethylene) or composite sealing structure to achieve the media barrier, suitable for water, gas and weak corrosive fluid system.

Structurals

Core components:

Valve body: made of ductile cast iron, stainless steel and other materials, the flow path is designed as straight-through to reduce flow resistance.
Butterfly plate: round or oval disc structure, fixed connection with the valve stem, material matching the valve body (such as ductile cast iron lined with rubber).
Seal ring: usually rubber (nitrile rubber, EPDM) or polytetrafluoroethylene (PTFE), embedded in the valve body or the edge of the butterfly plate, forming an elastic sealing interface.
Stem: through the centre of the butterfly plate, through the rotation of the butterfly plate drive opening and closing, the material should be corrosion-resistant (such as stainless steel 304/316).
Auxiliary design:

Clamped connection: flange to clamp mounting, compact structure, suitable for space-constrained scenarios.
Double sealing components (some models): as mentioned in the patent technology 'sealing components', through the superposition of seals or springs to compensate for wear and tear, to enhance the reliability of closure.

 

GNEE Centre Line Sealing Butterfly Valve

 

Applications

Municipal engineering:
Water supply and drainage systems (water plants, sewage treatment plants), fire-fighting pipe networks, controlling the direction of water flow.
Industrial field:
Petrochemical (weak corrosive media), electric power (cooling water circulation), food and pharmaceutical (aseptic fluid pipelines).
Special requirements:
Clamp type models are suitable for narrow space scenes, such as ships, underground pipeline network.

Advantages

Simple and economical structure:
Low component count, low manufacturing cost, maintenance only requires replacement of seals.
Low flow resistance and fast response:
No obstruction of the flow path when fully open, low flow loss; pneumatic models can be controlled within 1 second opening and closing time.
Bi-directional sealing capability:
The symmetrical design of the centre line makes the force on both sides of the butterfly plate balanced, supporting two-way cut-off (especially rubber-lined models)

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