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GEMÜ butterfly valves

Butterfly valves in plastic and metal

  • Areas of application and industrial sectors
  • Valve type
  • Technical data

Diaphragm valve: Areas of application and industrial sectors

GEMÜ butterfly valves are primarily used in industrial applications and the chemical industry, as well as the fields of water supply and water/waste water treatment. The concentric and single-eccentric designs are available as standard. However, the double-eccentric and triple-eccentric shut-off valves are also available for projects on request. Use of matched control components such as position indicators, positioners and process controllers allows GEMÜ butterfly valves to also be used in control circuits.

Diaphragm valve: Valve type

The butterfly valve comprises a ring-shaped body in which a ring-shaped elastomer seat/liner is inserted. A washer guided through a shaft swings through a 90° rotary movement into the gasket. Depending on the version and nominal size, this enables operating pressures of up to 25 bar and temperatures up to 210 °C to be shut off. Most often, these valves are used for mechanically pure liquids, but can also be used in the right material combinations without posing any problems for slightly abrasive media or gases and vapours. 

Due to the large variety of materials, the butterfly valve is universally compatible, for example with countless industrial applications, water/drinking water treatment, coastal and offshore sectors. The butterfly valve is also often a cost effective alternative to other valve types, where there are no stringent requirements regarding switching cycles, hygiene or control accuracy. In large nominal sizes of greater than DN 150, it is often the only shut-off valve that is still viable. For more stringent demands with respect to chemical resistance or hygiene, there is the possibility of using a butterfly valve with a seat made of PTFE or TFM. In combination with a PFA encapsulated stainless steel disc, it is suitable for highly aggressive media in the chemical or semiconductor industry; and with a polished stainless steel disc, it can also be used in the foodstuff or pharmaceutical sector.

For all the valve types specified, GEMÜ offers numerous customized accessories for automation and process optimization. Electr. position indicator, position and process controllers, sensor systems and measurement devices, are easily and quickly fitted, adjusted and integrated in the existing process control technology. 

Diaphragm valve: Technical data

OperationManual, pneumatic, motorized
ConnectionsUnion ends, threaded sockets, butt weld spigots
Operating pressure0 - 16 bar
Body materialsMetal: Aluminium, stainless steel, cast iron, brass, SG iron, cast steel
Plastic: PES, PP, PVC
Media temperatur-60 - 210 °C
Nominal sizesDN 15 - 1600
1 2 3
GEMÜ 410
410
Union end
Pneumatic
PVC-U, grey
6 bar
60 ° C
GEMÜ 411
411
Spigot; Threaded socket
Manual
1.4581; CW617N (brass)
10 bar
100 ° C
GEMÜ 415
415
Spigot; Threaded socket
Pneumatic
1.4581; CW617N (brass)
10 bar
100 ° C
GEMÜ 417
417
Union end
Manual
PVC-U, grey
6 bar
60 ° C
GEMÜ 423
423
Union end
Motorized
PVC-U, grey
6 bar
60 ° C
GEMÜ 428
428
Threaded socket
Motorized
1.4581; CW617N (brass)
10 bar
100 ° C
GEMÜ 480
480
Flange
With bare shaft
EN-GJS-400-15
16 bar
150 ° C
-10 ° C
GEMÜ 481
481
Flange
Pneumatic
EN-GJS-400-15
16 bar
150 ° C
-10 ° C
GEMÜ 487
487
Flange
Manual
EN-GJS-400-15
16 bar
150 ° C
-10 ° C
1 2 3

Uranium removal and partial deionization at the Trollmühle Waterworks

GEMÜ butterfl y valves at the Trollmühle Waterworks - Uranium removal and partial deionization using Uranex® and Carix® procedures
Currently, the waterworks at the Trollmühle water supply authority in Windesheim near Bingen am Rhein supply approximately 43,000 people in 14,000 households with 2.2 million m³ drinking water per year. At peak times, this means a daily dispensing volume of up to 8500 m³.
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