Butterfly valves

When are butterfly valves used?

Butterfly valves can be used in several types of applications and in many different fields. Shut-off butterfly valves are widely used in the petrochemical, pharmaceutical, pulp and paper, mining, energy and food industries. The valves are able to effectively regulate flows in both solid, liquid and gaseous forms and therefore have very diverse applications.

How does a butterfly valve work?

Butterfly valves are used when flows are to be regulated. The valves have a disc that opens and closes at 90 degrees to regulate the flow. The disc seals against a sleeve and is usually centrally located in the valve body. It can also have a double or triple eccentric design.The valves can be turned by lever or gear. They can also be operated by electric or pneumatic actuators.The design of the butterfly valve consists of the following components:

• Valve body - the valve body does not come into contact with the medium.
• Damper disc - has a streamlined design for best flow characteristics.
• Seal - seals against the liquid in question.
• Box packing - seals against the atmosphere.

Valves for various aggressive and abrasive fluids

Lyma's valves are specially developed to cope with large flows of aggressive or abrasive fluids.Our different butterfly valves handle corrosive media as well as

• lye
• hydrogen peroxide
• quench liquids
• formic acid
• hydrochloric acid
• sulphuric acid
• iron chloride
• hydrofluoric acid
• nitric acid
• scrubbing liquids.

In which versions are the butterfly valves available?

Lyma offers butterfly valves in several designs. The valves can be supplied with different connection options such as clamping between flanges (wafer) or as lug type where the valve is mounted between flanges. The valve then retains its sealing function even when mounted on one side.The dimensional range is DN40-1200. The most common dimension range is DN65-500. The valves can be operated manually, with gear, with air actuators and electric actuators, and can handle pressure classes up to 16 bar.Lyma offers butterfly valves in several designs:

• With or without sealing - Do you want to increase or decrease the flow? Our range includes thermoplastic butterfly valves with rubber collars, as well as unsealed dampers for adjusting gas flows, for example.
• Plastic or rubber seals - Lyma offers seals in the materials EPDM, Viflon, FKM, PFA or UHMW-PE.
• Valve bodies in different materials - Valve bodies are available in plastics such as PVC, PVDF, PP and also fibreglass. Metal valve bodies are available in cast iron, ductile iron and stainless steel.
• Different connections - DIN connection or ANSI connection

The sealing quality you need depends on the liquid or gas to be handled. The choice of design depends on your conditions, the nature of your process, the type of media that will pass through the valve, but also pressure and temperature. We are happy to help you develop a customised solution for your needs. welcome to get in touch with us!

What material are butterfly valves made of?

A butterfly valve can be manufactured in several different materials. The most suitable material depends, among other things, on the media, temperature, pressure and the area of application in which the valve is to be used, and the sealing of the valve is also available in different materials. Soft-sealed butterfly valves are commonly used, but if the valve is exposed to high pressure and high temperature, a metal seal is usually best suited.