Butterfly Valve

Butterfly Valve Manufacturer in Germany

Butterfly valves provide quarter turn isolation and flow regulation using a circular disc mounted on a rotating shaft. Their short face to face dimension, relatively low weight and suitability for large pipe diameters make them widely used in water, process, power, chemical, marine and industrial pipeline systems.

Quarter Turn Flow Isolation and Regulation:

A butterfly valve controls flow by rotating its disc through approximately 90 degrees.

In the fully open position, the disc is aligned broadly with the direction of flow. When rotated to the closed position, the disc seals against the seat and blocks the flow passage.

Intermediate disc positions can be used for throttling where the valve design and operating conditions permit.

The quarter turn mechanism provides:

Rapid opening and closing
Compact installation
Reduced valve weight in larger pipe sizes
Compatibility with manual or automated operation
Relatively simple actuator integration

Because the disc remains within the flow path even when open, butterfly valve sizing should also consider pressure drop, flow velocity and required control range.

Concentric and Offset Butterfly Valve Disc Designs:

The relationship between the disc, shaft and sealing surface determines seat contact, operating torque and temperature capability.

Concentric Butterfly Valve

Shaft and disc are centrally aligned, with the disc sealing against a resilient seat for water and utility service.

Double Offset Butterfly Valve

Two offsets reduce disc to seat rubbing, lowering operating torque and seat wear.

Triple Offset Butterfly Valve

Three offsets minimise seat contact during rotation and support metal seated, higher temperature process service.

Wafer, Lug and Flanged Body Configurations:

Body style determines how the butterfly valve connects to the piping system.

Butterfly Valve Body Configurations

Wafer: Compact body installed between two pipeline flanges.
Lug: Lugged body allows secure bolting and easier pipeline maintenance.
Flanged: Integral flanges provide robust connections for larger pipelines.

Selection depends on flange standard, pressure rating and maintenance requirements.

Technical Specifications:

Parameter	Typical Specification
Valve Designs	Concentric, Double Offset, Triple Offset
Body Types	Wafer, Lug, Flanged
Typical Size Range	DN40 to DN2000+, depending on design
Pressure Ratings	Commonly PN6–PN40; higher pressure classes available for selected high performance/offset designs
Body Materials	Cast Iron, Ductile Iron, Carbon Steel, Stainless Steel, Duplex, Super Duplex and Special Alloys
Disc Materials	Stainless Steel, Duplex, Super Duplex, Aluminium Bronze, Titanium and coated materials
Shaft Materials	SS410/420/431, SS316 or service-specific alloy
Seat Materials	EPDM, NBR, FKM, PTFE/RPTFE, Metal or Laminated Metal/Graphite
End Configuration	Wafer, Lug, Flanged
Operation	Lever, Gearbox, Pneumatic, Electric or Hydraulic Actuator
Design Standards	EN 593 / API 609 where applicable
Face to Face	EN 558 / API 609 according to design
Testing	EN 12266-1 / API 598 / ISO 5208 where applicable

Seat Compatibility and Temperature Limits:

Seat selection must consider both the process fluid and operating temperature.

EPDM

Commonly selected for water and compatible utility fluids. It is generally not selected for hydrocarbon service.

NBR

Used for compatible water, air and oil-related applications within the material’s operating limits.

FKM

Provides improved resistance to many oils, fuels and chemicals compared with standard elastomers, subject to actual media compatibility.

PTFE / RPTFE

Used for chemical and corrosive service where fluoropolymer compatibility and temperature capability are suitable.

Metal Seat

Metal seated and laminated seat designs are selected where operating temperature, pressure or media conditions exceed the limits of resilient seats.

Seat temperature limits should always be confirmed against the manufacturer’s pressure-temperature rating because allowable pressure normally decreases as temperature rises.