Triple Eccentric Extended Stem Butterfly Valve

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Extended Stem Butterfly Valve

Supports customization, the triple eccentric extended stem butterfly valve is a high-performance butterfly valve with advanced structure and reliable sealing. The valve adopts a triple eccentric design, allowing the valve disc to operate with almost no friction during opening and closing, ensuring a longer sealing surface lifespan. The extended stem structure facilitates operation in underground pipelines, deep wells, and environments with thick insulation layers, ensuring valve reliability while improving installation and maintenance convenience.

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1. Triple Eccentric Features of Extended Stem Butterfly Valve (customizable according to your needs)

　　1、 Extended Stem Butterfly Valve Adopts triple eccentric sealing structure, with almost no wear between the valve seat and the disc, featuring a sealing function that tightens as it closes ;

　　2 The sealing ring is made of stainless steel, combining the advantages of metal hard sealing and elastic sealing, providing excellent sealing performance under both low and high temperatures, and corrosion resistance , Long service life and other characteristics ;

　　3 The disc sealing surface is made by overlay welding cobalt-based hard alloy, making the sealing surface wear-resistant and durable ;

　　4 Large-sized discs use a ribbed frame structure, offering high strength, large flow area, and low flow resistance ;

　　5 This valve has bidirectional sealing capability, installation is not restricted by the direction of the medium flow or spatial position, and can be installed in any direction ;

　　6 The drive device can support multiple positions ( Rotation 90° or 180°) Installation is convenient for users.

2. Triple Eccentric Main Technical Parameters of Extended Stem Butterfly Valve

Nominal Diameter	DN (mm) 100-3000
Nominal Pressure	PN (MPa)	0.6	1.0	1.6	2.5	4.0
Test Pressure Ps (MPa)	Strength Test	0.9	1.5	2.4	3.75	6.0
	Sealing Test	0.66	1.1	1.76	2.75	4.4
	Air Tightness Test	0.6	0.6	0.6	0.6	0.6
Applicable Medium	Water, steam, oil products, acidic corrosive media, etc.
Applicable Temperature	Carbon Steel: -29 ℃ ~425 ℃ Stainless Steel: -40 ℃ ~600 ℃

3. Triple Eccentric Main Material of Extended Stem Butterfly Valve Parts

Part Name	Material
Valve Body	Cast iron, cast steel, stainless steel, chrome-molybdenum steel, alloy steel
Disc	Cast steel, alloy steel (hard chrome plated), stainless steel, chrome-molybdenum steel
Sealing Ring	Stainless steel, polyurethane, wear-resistant materials
Valve Stem	2Cr13、1Cr13 Stainless steel, chrome-molybdenum steel
Packing	Flexible graphite