Butterfly valves

Lyma product range

Butterfly valves for industrial and corrosive processes

Lyma offers butterfly valves for demanding industrial applications where large flows of aggressive, abrasive or gaseous media need to be controlled or shut down. With over 40 years of experience in the process industry, we deliver reliable solutions adapted for both shutdown (on/off) and control.

Our butterfly valves are characterised by short build length, easy installation and high flow capacity, making them particularly suitable for larger dimensions.

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Asahi butterfly valve type 57 DN40-350

Asahi butterfly valve lug type 57L DN80-250

Asahi butterfly valve type 56 DN400

Asahi butterfly valve type 56D/75D DN400-600

Asahi butterfly valve type 58 DN700-1200

Richter PFA/PTFE lined butterfly valve type NKS/NKL DN50-750

When are butterfly valves used?

Butterfly valves are mainly used when:

  • large flows should be regulated

  • low pressure drop is desirable

  • installation requires compact dimensions

  • cost-effective shutdown needed in larger dimensions

They are frequently used in:

  • petrochemical industry

  • pharmaceutical industry

  • paper and pulp industry

  • mining and minerals industry

  • energy plants

  • food industry

The valves can handle liquids, gases and some solids, which makes them very versatile.

How does a butterfly valve work?

A butterfly valve regulates the flow through a damper disc that rotates 90° in the valve body. When the disc is turned, the flow opens or closes.

The construction consists of:

  • Valve body - does not normally come into contact with the medium

  • Damper disc - optimised for good flow properties

  • Sealing (cuff) - ensures tightness to the medium

  • Box packing - seals against the atmosphere

The valve can be:

  • centrally stored

  • double eccentric

  • triple eccentric

Manoeuvring is done via:

  • lever

  • change

  • pneumatic actuator

  • electric actuator

Butterfly valves for aggressive and abrasive media

Lyma butterfly valves are designed to handle corrosive and chemically aggressive liquids, such as:

  • lye

  • hydrogen peroxide

  • formic acid

  • hydrochloric acid

  • sulphuric acid

  • nitric acid

  • iron chloride

  • hydrofluoric acid

  • scrubbing liquids

Material selection and seals are customised according to chemical resistance, temperature and pressure to ensure long life and high reliability.

Versions and technical specifications

Lyma offers butterfly valves in several designs:

Connection types

  • Wafer (clamping between flanges)

  • Lug type (one-sided mounting possible)

  • DIN connection

  • ANSI connection

Dimensions & print

  • DN40-1200

  • Most common: DN65-500

  • Pressure classes up to 16 bar

Seals

  • EPDM

  • FKM

  • PFA

  • UHMW-PE

  • Viflon

Valve body material

  • PVC

  • PVDF

  • PP

  • Glass fibre reinforced plastic

  • Cast iron

  • ductile iron

  • Stainless steel

Valves can be supplied with or without seals, depending on whether the application requires shut-off or adjustment of, for example, gas flows.

Choice of materials and sealing

The right choice of material depends:

  • media

  • temperature

  • pressure

  • chemical resistance

  • operating environment

For high temperatures and pressures, metal sealed butterfly valves may be suitable, while soft sealed valves are common in chemical handling.

Lyma helps you design the right valve for your process - with a focus on safety and lifetime.

Need help choosing a butterfly valve?

Contact our product specialists, we will help you develop a technically and economically optimal solution for your application.