Concentric Butterfly Valve

Concentric butterfly valve is an industrial valve used for flow control of pipeline systems. The valve stem axis, disc center and body center are on the same axis. Turning the lever or gear or the actuator drives the valve stem to rotate, then make valve disc rotates 90°around the axis to achieve open and close operation, thereby adjusting or cutting off the flow of the medium. It has the advantages of simple structure, light weight, low cost and small flow resistance. So widely used in water treatment, HVAC, fire protection systems, chemical and food industries, etc., especially suitable for pipeline control of clean water, gas and weakly corrosive media.

Design Feature：

Concentric design

Non Pin stem

Low torque

Zero leakage

Low torque

Self cleaning

Blowout-proof stem

Production Standard：

Design	API 609
Face-to-Face	ISO 5752-20 / ISO 5752-13
End Connection	ASME B16.5 / ASME B16.47 / EN 1092-2 / GOST 33259
Test	API 598

Technical Specification：

Size	2″–80″ (DN50–DN2000)
Pressure Class	150Lb (PN10, PN16)
Connection Type	Double Flange / U-Type Flange / Wafer / Lug
Operation	Manual / Worm Gear / Pneumatic Actuator / Electric Actuator
Temperature	-20°C to +160°C
Application	Sewage Treatment / Desalination of Seawater / Chemical / Corrosion Media

Material Option：

Body	Cast Iron / Ductile Iron / WCB
Disc	Stainless Steel (CF8, CF8M, CF3, CF3M)
	Duplex Stainless Steel (4A, 5A, 6A)
	Hastelloy Alloy (N-12MV, CW-12MW, CW-2M)
	Inconel Alloy (CY-40, CW-6MC)
	Monel Alloy (M35-1)
	Aluminium Bronze Alloy (C95400, C95500, C95800, AB2C)
Stem	SS420 / 17-4PH / F304 / F316 / K500
Seat	EPDM / NBR / Viton