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Double Eccentric Butterfly Valve - Hard Rubber Design


TIS double flanged double eccentric butterfly valve with vulcanized hard rubber lining for saline media (seawater or well-desalination) or corrosive media, is designed to withstand the chemical attack of chloride ions.

Due to the fluid's aggressivity, standard epoxy coated valve surfaces would be rapidly abraded or corroded.

The best possible solution, in order to guarantee the valve's longevity and safe operation, is to protect the inner surface of the valve with 3 mm of hard rubber lining: this way, the disc and internal surface of the body are protected from the aggressive fluids.

Other parts of the valve in contact with water (shaft and retaining seal ring) are made of duplex stainless steel, with high resistance to corrosion.

Common applications
  • Water treatment plants

  • Desalination plants

  • Mines

  • Industrial water

  • Treatment plants in minerals

• Soft sealing according to EN 593;

• Face to face dimension according to EN 558 series 14;

• All materials, including lubricants, in contact with water approved for human consumption according to EN 1074-1 and EN 1074-2;

• One-piece body made of ductile iron EN GJS 400-15 according to EN 1563;

• Flange dimensions according to EN 1092-2;

• Screws, washers made of stainless steel A2-70 EN ISO3506-1;

• Retaining seal ring made of stainless steel EN 1.4301 EN 10088-3 (AISI 304);

• Body seat ring welded on the body, made of stainless steel;

• Shaft and disc polygon coupling “P3G” type according to DIN 32711;

• Main disc sealing ring made of EPDM according to EN 681-1 WA, WB;

• Shaft supported by solid and maintenance-free bronze bearings (PN25 - PN40, from DN600 and above, with additional PTFE low

friction lining);

• Internal and external surface protection made of epoxy resin powder (FBE), blue colour RAL 5015 and thickness of 250μm;

• Hydraulic test according to EN 12266-1;

• Tight in both flow directions, rate A according to EN 12266-1 (zero drops);

• Working temperature Min. -10°C (excluded frost) Max. + 70°C;

• Gearbox with self-locking worm gear including mechanical position indicator;

• Gearbox suitable for coupling with actuator according to ISO 5210 top flange.


Upon request, some parts can be produced with high corrosion-resistant materials such as:

• Retaining ring made of stainless steel 1.4571 EN 10088-3 (AISI 316Ti) or DUPLEX 1.4462 EN 10088-3;

• Shaft made of stainless steel 1.4301 EN 10088-3 (AISI 304), 1.4401 EN 10088-3 (AISI 316) or DUPLEX 1.4462 EN 10088-3;

• Screws and washers made of stainless steel A4-70 EN ISO 3506-1, DUPLEX or SUPERDUPLEX.

Double Eccentric Butterfly Valve - Hard Rubber Design

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