What are the different types of butterfly valves?

The main classification of butterfly valves

By driving mode:

(1)Electric butterfly valve

(2)Pneumatic butterfly valve

(3)Liquid-operated butterfly valve

(4)Manual butterfly valve (handle/turbine)

By structure form:

(1)Midline seal butterfly valve

(2)Single eccentric seal butterfly valve

(3)Double eccentric sealed butterfly valve

(4)Triple eccentric seal butterfly valve

Sealing surface materials are divided into:

(1)Soft seal butterfly valve.

1)The sealing vice is composed of non-metallic soft material to non-metallic soft material.

2)Sealing sub consists of metal hard material to non-metal soft material.

(2) Metal hard seal butterfly valve. The sealing sub is composed of metal hard material to metal hard material.

By connection method.

1、Clipped butterfly valve

The butterfly plate of the butt-clamp butterfly valve is installed in the diameter direction of the pipeline. The valve is fully open.

The butterfly valve is simple in structure, small in size, and light in weight. The butterfly valve has two types of sealing, resilient seal and metal seal. Resilient seal valve, the seal ring can be set on the valve body or attached to the butterfly plate periphery.

2、Flanged butterfly valve

The flanged butterfly valve is a vertical plate structure, the stem is an integral metal hard seal valve seal ring

For flexible graphite plate and stainless steel plate composite structure, installed on the valve body, butterfly plate sealing surface overlay welded stainless steel. The sealing ring of the soft seal valve is made of nitrile rubber and is installed on the butterfly plate.

3、Lug type butterfly valve

4、Welded butterfly valve

The welded butterfly valve is a non-closed butterfly valve, widely used in building materials, metallurgy, mining, electric power, and other production processes in the medium temperature ≤ 300 ℃ nominal pressure of 0.1Mpa pipeline, to connect, open and close or adjust the amount of media.

Functional use introduction (use scenario).

The butterfly valve fully open to full close is usually less than 90°, the butterfly valve and the butterfly stem itself do not have self-locking ability, for the positioning of the butterfly plate, a worm gear reducer is added to the stem. The use of a worm gear reducer can not only make the butterfly plate have the self-locking ability and make the butterfly plate stop at any position, but also improve the operational performance of the valve.

Features of the industrial butterfly valve: it can resist high temperatures, the applicable pressure range is also high, the nominal diameter of the valve is large, the valve body is made of carbon steel, and the sealing ring of the valve plate is made of the metal ring instead of rubber ring. The large high-temperature butterfly valve is made of welded steel plate, mainly used for the high-temperature medium of flue air ducts and gas pipelines.

①Usually, in throttling, regulating control, and slurry media, the structure is required to be short in length and fast in opening and closing speed (1/4 turn). Low-pressure cut-off (small differential pressure), butterfly valve is recommended.

② in double-position adjustment, indented ground channel, low noise, cavitation and cavitation phenomenon, a small amount of leakage to the atmosphere, with abrasive media, butterfly valves can be selected.

③In special working conditions throttling adjustment, or requiring strict sealing, or serious wear, low temperature (deep cold), and other working conditions when using butterfly valve, need to use special design metal seal with regulating device three eccentric or double eccentric special butterfly valve.

④ Butterfly valves are suitable for fresh water, sewage, seawater, salt water, steam, natural gas, food, medicine, oil and various acids and alkalis, and other pipelines that require complete sealing, zero leakage in gas test, high life expectancy and working temperature from -10 degrees to 150 degrees.

⑤ Soft seal eccentric butterfly valve is suitable for bi-directional opening and closing and adjustment of ventilation and dust removal pipelines and is widely used in metallurgy, light industry, electric power, petrochemical systems of gas pipelines, waterways, etc.

⑥The Metal-to-metal wire-sealed double eccentric butterfly valve is suitable for city heating, gas supply, water supply, and other gas, oil, acid, and alkali pipelines, as regulating and throttling devices.

⑦ Metal-to-metal face-sealed triple eccentric butterfly valve is widely used in petroleum, petrochemical, chemical, metallurgy, electric power, and other fields, in addition to being used as a control valve for large pressure change adsorption (PSA) gas separation device program, and is a good alternative to gate and globe valves.

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