Butterfly Valves

A butterfly valve is designed for fluid control; it is a type of valve that minimizes mechanical wear between the disc and the valve seat during opening and closing, thanks to its gradual sealing principle.

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Why Choose ATLAS Butterfly Valves?

ATLAS double-eccentric butterfly valves are designed for reliable fluid control in drinking-water, industrial-water and infrastructure installations. The double-eccentric disc geometry disengages the disc from the sealing surface in a controlled manner during operation, helping reduce friction and seat wear. This supports low operating torque and long-term sealing performance.

A GJS400 ductile iron body, AISI 316 stainless steel seating surface and EPDM seal provide a durable structure. PN10 models can be considered for suitable water transmission and distribution applications within the stated −10 to +90 °C operating range. A design compliant with TS EN 593 assists specification-based selection.

Electric actuators or manual gearboxes allow adaptation to operating and automation requirements. A sealing O-ring that can be replaced without removing the valve body helps simplify maintenance and reduce service interruption.

Key benefits

Double-eccentric design and low operating torque.
GJS400 ductile iron body.
AISI 316 seating surface and EPDM seal.
PN10 pressure rating.
Electric actuator or manual gearbox options.
Replaceable sealing O-ring for easier maintenance.

When opening or closing the valve, the sealing face of the butterfly disc moves gradually and is pressed gradually against the sealing surface of the valve seat, thereby reducing mechanical wear and damage between the butterfly disc and the valve seat during opening or closing. For a double-axis butterfly valve, when the butterfly disc rotates from 0° to 8°–12°, the sealing face of the butterfly disc completely separates from the sealing face of the valve seat, thereby reducing mechanical wear and extrusion corner movement. By reducing mechanical wear and the abrasive effect of the flow during the opening or closing of the butterfly valve, the valve’s sealing performance and service life are significantly improved.

	DN150	DN200	DN250	DN300	DN350	DN400	DN450	DN500	DN600	DN700	DN800
Length [mm]	210	230	250	270	290	310	330	350	390	430	470
Height [mm]	285	340	395	445	505	565	615	670	780	895	1015
Width [mm]	330	420	480	530	595	660	710	768	885	1010	1140

	DN900	DN1000	DN1100	DN1200	DN1300	DN1400	DN1500	DN1600	DN1800	DN2000	DN2200
Lenght [mm]	510	550	550	630	630	710	710	790	870	950	950
Height [mm]	1115	1230	1340	1455	1585	1675	1785	1915	2115	2325	2555
Width [mm]	1240	1365	1480	1605	1750	1835	1951	2097	2300	2515	2760

Operating Principle and Design
Operating Principle and Design	Sealing Mechanism	Stainless steel seat surface, EPDM sealing gasket
	Disc Movement	The sealing surface separates gradually during opening/closing (Prevents mechanical wear)
	Flow Control	High-precision flow characteristic curve and dynamic adjustment stability
	Structural Advantages	Easy installation with double flanges and low opening/closing torque with double eccentric design
Materials and Technical Data
Materials and Technical Data	Body Material	GJS400 (Ductile Iron)
	Seat Surface	AISI 316 Welded Seat
	Sealing	100% watertight, excellent O-ring durability
	Pressure Class	PN10 (Design pressure PN10/16)
	Operating Temperature	Between -10°C and +90°C
	Control Methods	Electric actuator, gearbox with manual handwheel
Maintenance and Standards
Maintenance and Standards	Ease of Maintenance	The sealing O-ring can be replaced easily without removing the valve from the pipeline.
	Testing and Standards	TS EN 593