China Butterfly valve manufacturer,factory and supplier-Butterfly valve
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SHANGHAI HUIXUAN VALVE

Mobile:+86-17717520739
Wechat:17717520739
Email:info@shxvalve.com
Address: NO.720, Suide Road, Jiading District,Shanghai, China.
Ball valve manufacturer   

Double flanged eccentric butterfly valve

  • Port size:2″ to 100″,DN50-DN2400
  • Pressure:PN10-100 bar,150LB-900LB
  • Structure:Triple eccentric,metal seated
  • Medium:Water,steam,oil,etc.
  • Temperature :-40~450℃
  • Body material:Carbon steel,stainless steel,etc.
  • Connection:Double flanged or others
  • Feature:Manual,electric,pneumatic actuator is optional
China eccentric butterfly valve manufacturer, factory and supplier, double flanged eccentric butterfly valve is important for applications where bubble-tight sealing is needed. In some applications, bubble-tight sealing cannot be accomplished by using double eccentric butterfly valve. Double flanged eccentric butterfly valve gives superior advantages where cam action and right-angled conical sealing ensures that the metal seal elements will never come in contact until its final degree of closing.

Double flanged eccentric butterfly valve metal to metal sealing provides bubble-tight shutoff which results in no leakage performance.Friction-free stroking is available throughout the cycle which allows the operation with low torque and extends the eccentric butterfly valve life. Double flanged eccentric butterfly valve has no cavities between the sealing elements due to which clogging is eliminated which results in low maintenance and in turn extends the triple eccentric butterfly valve life.

Double flanged eccentric butterfly valve specification:
● Material: Cast Iron, Ductile iron, Carbon steel. Stainless Steel and others
● Actuator Type: Manual, Electric (on-off or regulating), Pneumatic (spring return or double acting)
● Operating Pressure: 10-100 bar,150LB-900LB
● Medium Temperature: -10 to 180 ℃ for rubber seat, -40 to 450℃ for metal seat.
● Size Range: 2″ to 100″
● Suitable Medium: Water, Oil, Air, Gas, etc.


Double flanged eccentric butterfly valve product features:  
1. 
Double flanged eccentric butterfly valve adopts three eccentric sealing structure, seat and disc almost no wear, with tighter sealing function;  
2. Eccentric butterfly valve sealing ring is made of stainless steel, with the dual advantages of metal hard seal and elastic seal, both at low temperature and high temperature, have excellent sealing performance, with corrosion resistance, long service life and other characteristics;
3. Eccentric butterfly valve sealing surface using surfacing cobalt-based hard alloy, sealing surface wear resistance, long service life; 4. Large size disc adopts quilted frame structure, high strength, large flow area, small flow resistance;  
5. 
Double flanged eccentric butterfly valve with two-way sealing function, installation is not restricted by the flow of media, is not affected by the spatial position, can be installed in any direction;  
6. The driving device can be multi-station (rotating 90° or 180°) installation, easy to use.  


Triple eccentric butterfly valve structure introduction:  
There are three different eccentric structure in the Triple eccentric butterfly valve.Two offsets are at the center and the third offset is on the sealing surface creating a cone-like shape of the disk and the seat. Triple offset valves are used where a bubble-tight seal is required, the system is under high temperature and hard sealing with zero leakage is needed.

First eccentric is provided to the central axis of the sealing surface in which the disc rotates 360-degree around the middle axis to provide sealing by deforming the soft seal which results in full friction.

Second eccentric refers to the position of the shaft with respect to the centerline of the bore. At the time of operation, it produces a cam action to lift the seat away from the seal, results in friction during the first 10 degrees of opening and the last 10 degrees of closure.

The third eccentric is the geometry of the closing elements. Each sealing element is machined into a conical offset profile, which results in a right-angled cone. Throughout its working cycle, this guarantees friction-free stroking. Contact is only made with the 90° angle functioning as a mechanical stop at the final point of closure; this results in no over-travel of the disc seat.

When these three eccentric structure is provided together the valve offers a continuous sealing surface, shows minimal wear between sealing surfaces, and provides durable sealing throughout the valve’s life. In addition, sticking and binding of the disk is lowered and less operating torque is required as it has an optimized seating angle.

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