API609 Triple Eccentric Butterfly Valve
Windmill Characteristic
• High performance
• Triple eccentric strucutre
• Low attrition
• High termperature services
• Zero leakage
• Both have adjust and shut-off fuction
• Low maintenance costs
• Applies for petrochemical,power,metallurge, lightindustry
Bi-directional Seal Butterfly Valve
High Performance
Triple Eccentric
Bidirection Seal
Wafer,Lug,Flanged,Butt Weld
Fire-safe
Metal Seal & Soft Seal
Size: 2" - 200"
Pressure: 150# 300# 600# 900#
Operation: Lever,Gear,Actuator
Design: API609
Face to face: ANSI B16.10
Ends Connection: ANSI B16.5
Testing: API598
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API609 SERIES BUTTERFLY VALVES
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AM780 High Performance Triple Eccentric Butterfly Valve
The advance metal seating high performance triple eccentric butterfly valve provides a bi-directional bubble tight shut off. This is achieved by introducing state-of-the-art triple eccentric disc geometry. The valve shaft is off-set against the seal, (1st off-set), and against center line of the valve (2ndt off-set). The seating edges are machined with a continuously changing slope from an angle alpha on top of the oval seat ring to an angle beta at the opposite side (3rd off-set angular).
This geometry ensures that the seat ring stays clear of the seat except at the final shut-off position, resulting in long seat life and operating cycles in excess of 500 000.
This range of valve is particular for the triple eccentric design, the lamellar seal ring which is mounted on the disc and is made of stainless steel metal rings including sealing material as graphite. The triple eccentric design allows the disc a translation movement to permit the contact between the lamellar seal ring and the seat on the body of the valve only at shut-off.
We offer High Performance Triple Eccentric Butterfly Valve AM780 Series.
1. High Performance Patented 3D Eccentric Sealing System.
2. Excellent Isolation Function for Gas and Liquid and Flow Regulating Feature.
3. Long Service Life is Available for Welding-in Stainless Steel or Surfacing Welding Hard Alloy Valves.
4. No Friction, No Wearing and No Jam in Valve Seat When Open-Close Operation.
5. Sealing Ring Easy for Replacing and Regulating.
6. Applicable to Bad Working Conditions like High Temperature, High Performance and Corrosive.
7. Lower Operation Torque and Reliable Torque Turn-off.
8. Reliable Fire Resistance Safe Design.
The use of soft-seated rotary valves (Ball valves & butterfly valves) has increased and now-a-days these valves are being used for most of the process applications. With the valve in closed position after the seal ring touches the body seat, torque is applied to achieve proper sealing. For very high temperature applications (450 deg, C and higher] these valves can be provided with solid seal ring, however solid seal ring can give Class V shut off on actual working condition. Under test condition it is posslble to achieve class VI shut off with solid seal ring, but after few operations the valve gives class V shut off only, so it is not recommended to use the valve with solid seal ring, where class VI shut off is essential. Body Disc Disc Seat 1 Stam Bearing Body / Disc seal Gasket Gland / Gland flange Gland Packing Gear Unit The centreline of the cone is ritated away from the valve centreline resulting in an ellipsodal profile and providing the third offset. With this geometry, seat seal interference is completely eliminated ensuring long sealing life. The result is a torque seated, process pressure aided FRICTIONALESS seal. The geometry allows the body seat to be used as the closed limit stop, aiding operator adjustment. The Triple Offset design is ideally suited to metal seated valves providing bubble-tight performance on high temperature, high pressure and firesafe applications.
Especially the soft seated butterfly valves are more popular because it seemingly can provide tight shut-off,due to its soft seal material. Also these valves are of lower weight, compact.easy to handle and provided better stem sealing.
However, soft seated butterfly valves have pressure & temperature limitations. A high performance butterfly valve... double eccentric design with PTFE seat is suitable for maximum temperature of 220 deg C and pressure of 50 bar.
Some of the process applications (like volatile liquid, steam, high temperature media etc.] call for metal seated tight shutoff valves, but metal seated valve with double eccentric design can not provide tight shut off or Class VI shut off. So to overcome these limitations Metal seated triple offset butterfly valve was invented.
Metal seated Butterfly valve can ideally replace gate valve also, where tight shut off is necessary and gate valves cannot provide tight shut off. 
The Important part of this valves is the seal ring.The seal ring provided in this valve is usually laminated type (st.steel + graphitc) to give flexibility so as to achieve tight shut off. This seal ring is suitable up to 450 deg.C temperature. Depending upon the application the seal ring is provided with ViTON or PTFE composite (i.e. laminated seal ring -st.steel + viton or st. steel + ptfe). This seal ring is used when metal tight shut off is required fo lower temperature applications.
Click To Image View Enlarge Conformity to codes and standards :
: Steel ASTM A 216 Gr. WCB / Stainless Steals A5TM A 351 Gr. CF8 / CFE : Steel ASTM A 216 Gr. WCB Electrons Nickle plated / Stainless Steel ASTM A 351 Gr. CF8 / CF8M : Laminated Stainless Steel TYPE 316 / Graphite, laminated Inconel 600 / Graphite Disc Seat Retainer Ping : Stainless Steel ASTM A 351 Gr. CFBM : Stainless stael TYPE 316 Hard chrome / ASTM A 439 TYPE 02 {Ni-Resist} Shaft : Steel ASTM A 276 TYPE 410/304/316/ ASTM A 564 TYPE 630 H 1150 + 1150 (17-4 PH) : Graphite : Stainless Steel TYPE 316 : Braided moulded + Die moulded Graphite ring. : Cast Ircn Housing with Gear in S.G. Iron / ENB and Worm in EN8 / EN19 Surface Protection for Cast Caibon
Steel Valves: Prime Coat: Chlorine free with modified alkyrd resin unobjectionable in physiological and toaxicological respects, Additional external coating: Heat resistant silver streak aluminium paint
Single Offset The centre of rotation is moved back from the centreline of the valve disc. The seat and seal are designed conically and on centre.This design relies on a frictional interference seal and so is applicable only to soft seated valves. 
Double Offset The centre of rotation is moved from the centreline of the valve body. The seat and seal are design remains conical and on centre. This design again relies on a frictional , interference seal, but the length of rotation over which this friction occurs Is reduced, allowing a larger of process resistant seal materials to be used. However these materials to be used. However these materials to be used. However these materials must be relatively soft or highly elastic to prevent "jamming". 
Triple Offset 
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