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Pneumatic metal butterfly valve

GEMÜ 491 Edessa

ConfigureTechnical data sheet
Pneumatically controlled shut-off valve with PTFE lining, stainless steel valve disc, and flange connection – ideal for the chemical, pharmaceutical, and food industries.

PTFE-sealing, centrally mounted butterfly valve

Product information

The GEMÜ 491 Edessa PTFE lined butterfly valve has a metal actuator and is pneumatically operated. The "Normally Closed", "Normally Open" and "Double Acting" control functions are available. Disc and shaft are one piece, body and liner are available in different designs. The butterfly valve is available in nominal sizes DN 25 Up to 600 and in standard installation lengths ISO 5752/20 | EN 558-1/20 | API 609 category A (DIN 3202 K1) in wafer and lug body versions.

Key features

  • Suitable for chemically corrosive media
  • Bubble tight sealing, in accordance with EN 12266-1/P12, leak rate A
  • High-quality selection of materials can be combined in different ways
  • High level of plant reliability thanks to one-piece shaft and spring-washer-supported seal system
  • Long service life thanks to shaft bearings and special disc and liner geometry
  • Optional accessories are installed, set and tested so they are ready for operation
Pneumatically controlled shut-off valve with PTFE lining, stainless steel valve disc, and flange connection – ideal for the chemical, pharmaceutical, and food industries.

Technical features

Parameters
Value
Media temperature
-20 to 200 °C
Ambient temperature
-20 Up to 95 °C
Operating pressure
0 Up to 10 bar
Nominal sizes
DN 25 to 600
Housing configurations
Lug
Wafer
Connection standards
AS
ASME
DIN
EN
ISO
JIS
Body materials
1.4404, block material
EN-GJS-400-18-LT, SG iron material
S355J2 + N, cast steel material
VE Duroplast, reinforced
Body coating
Epoxy
Liner materials
PTFE/EPDM
PTFE/FKM
PTFE/silicone
Disc materials
1.4404 (316L), forged material
1.4469, Duplex cast steel material
2.4602 (alloy 22), block material
3.7035, titan
Disc coating
PFA
Conformities
ATEX
EAC
FDA
FMEDA
TA Luft (German Clean Air Act)

Downloads

17 Results
  • Product certificate RoHS - GEMÜ product collection

    pdf, 450 KB, DE, EN

  • Produktbroschüre Für hohe chemische Anforderungen Baureihe 490 Edessa

    pdf, 606 KB, DE

  • Käyttöohje GEMÜ 490, 491, 497, 498

    pdf, 973 KB, FI

  • Product brochure For aggressive chemical applications 490 Edessa series

    pdf, 606 KB, EN

  • Fiche technique GEMÜ 490, 491, 497, 498

    pdf, 2.11 MB, FR

  • Data sheet GEMÜ 490, 491, 497, 498

    pdf, 2.26 MB, EN

  • Application brochure Fertilizer production

    pdf, 1.32 MB, EN

  • Руководство по эксплуатации GEMÜ 490

    pdf, 1.00 MB, RU

  • Användarhandbok GEMÜ 490, 491, 497, 498

    pdf, 948 KB, SV

  • Betriebsanleitung / Operating instructions GEMÜ 490

    pdf, 928 KB, DE, EN

  • Product certificate TA-Luft - GEMÜ 49X

    pdf, 1.97 MB, DE, EN

  • 操作说明 GEMÜ 490, 491, 497, 498

    pdf, 1.17 MB, ZH

Suitable services

  • Expert knowledge for your applications

    Training

    Deepen your expertise in valve technology and plant control. Our training courses provide practical content to help you design processes that are safe, efficient, and compliant with standards.

  • Ensure longevity and reliability

    Maintenance

    Regular maintenance ensures consistently stable processes. Our service teams ensure the availability of your systems and reliably extend the service life of your components.

  • Fast, efficient, and precise

    Repair

    When it comes to repairs, every minute counts. Our experts analyze, repair, and test reliably - using original spare parts, technical precision, and a focus on minimizing downtime.

  • Intelligent networking with GEMÜ CONEXO

    Digital support

    CONEXO makes maintenance digital: RFID technology and mobile apps enable the unique identification of your components and document maintenance processes transparently.