Butterfly valves
Butterfly valves can be Wafer (connection with four ears, two tops and two bottoms, centering in the fusion of the valve body) Lug (connection with threaded ears in the fusion of the valve body) or biflanged (connection with flanges drilled according to the PN and obtained in the fusion of the valve body). The Lug model is used for mounting on flanged connections, through the crown body of threaded holes. The Wafer model is used for mounting between two counterflanges.
Since the seal is made of an elastomer, the Wafer and Lug models cannot withstand high temperatures and pressures. For very large diameters, flanged butterfly valves are recommended.

The body and disc of the butterfly valve can be made of grey cast iron or ductile cast iron, all parts that come into contact with water are protected from corrosion. When the valve is in the open position, there may be small localised pressure drops, while there may be strong turbulence and vibration in the case of partial closure. Therefore, it is not suitable for regulation. It is recommended for vacuum sealing as it has a perfect bi-directional seal and is leak-free. For small diameters the manoeuvres can be done directly by hand with the handwheel or lever, for larger diameters or for very strong pressures, it is necessary to have manual handwheel reducers or electric or pneumatic actuators.
In case of high pressures, butterfly valves are often equipped with a small bypass with tap, with which, in the closed position, the pressures on the two faces (upstream and downstream) of the disc can be balanced beforehand, making it easier to open the valve. Butterfly valves are usually used for: seawater, industrial water, drinking water, wastewater, fuel, air and other inert fluids depending on the type of elastomer. They can be mounted, from DN40 to DN250, on both sides. From DN300 to DN1200 operate on one side (horizontal shaft). Maximum operating temperature 150°C.
Wafer butterfly valve – Art 4497
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In grey iron or ductile iron
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Face to face according to EN 558-1;
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Suitable for temperatures up to 150°C;
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PED / CE Certified
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Certified for drinkable water DM 174
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Applications: sea water, industrial water, drinkable water, waste water, fuel, air and other inert fluids based on the type of elastomere;
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Installation: from DN40 to DN250, on both sides. From DN300 to DN1200 operate from one side (horizontal shaft)

Lug butterfly valve – Art 4495

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In grey cast iron;
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Face to face according to EN 558-1;
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Suitable for temperatures up to 150°C;
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PED / CE Certified
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Certified for drinkable water DM 174
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Applications: sea water, industrial water, drinkable water, waste water, fuel, air and other inert fluids based on the type of elastomere;
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Installation: from DN40 to DN250, on both sides. From DN300 to DN1200 operate from one side (horizontal shaft)
Biflanged eccentric butterfly valves – Art. 4493
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In ductile cast iron
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Face to face according to EN 558-1;
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Suitable for temperatures up to 120°C;
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PED / CE Certified
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Certified for drinkable water DM 174
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Applications: sea water, industrial water, drinkable water, waste water, fuel, air and other inert fluids based on the type of elastomere;
-
Installation: from DN40 to DN250, on both sides. From DN300 to DN1200 operate from one side (horizontal shaft)

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