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Double Eccentric Butterfly Valve - F4 Design


Double flanged double eccentric butterfly valve T.I.S. Type is designed in order to shut off the flow or limit it partially. Indeed, with some limitations double flange double eccentric butterfly valve may also be used as control valves.

The tightness of the valve is guaranteed by an automatic sealing system in the seat: when closed, the operating pressure supports the tightening effect by pressing the soft sealing ring against the conical seat surface in the valve body in both flow directions.

The double offset design of the valve allows to get two important advantages:

• when the valve is open, the profile sealing ring is completely unstressed;

• during opening/closing operations, the disc sealing ring does not apply any friction on the body seat: the operating torque is in this way reduced, and the seal's life is extended.

The valve is suitable for drinking water applications as well : the fusion bonded epoxy process (FBE), with certified resin powders used for internal and external surfaces, guarantees a heavy corrosion protection.

Flowrates Tip

These valves can be burried underground. In this case, it is important to change the gearbox to a IP68 version adapted for this purpose.

• 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 - F4 Design

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