Pneumatic tri-eccentric high performance butterfly valve
SPB Pneumatic tri-eccentric high performance butterfly valve is composed of GTX-B series
pneumatic rack and pinion actuators and triple eccentric high performance butterfly valve body
assembly. The tri-eccentric butterfly valve is innovative product of the double eccentric. On the
basis of preserving primary radical eccentric and axial eccentric, the axis of conical seal surface
has been inclined with the center of valve flow path to form angle eccentric. The unique design
make it suitable to high pressure & high temperature etc heavy duty services. additionally, the
butterfly valve has excellent sealing performance.
SDB pneumatic tri-eccentric butterfly valve is characterized by compact structure,effective handle
and long work life. It can be widely used in oil,chemical, power station, metallurgy, textile, food,
pharmaceuticals, papermaking and so on to reliably cut-off or control various process fluids.
■ Standard Specifications
Body
Type : Full bore cast butterfly valve，(As shown in figure 1)
Nominal Diameter: DN50-DN1200
Nominal Pressure : GB PN 0.6,1.0,1.6,2.5,4.0（DN50～DN400）,6.3（DN50～DN200） MPa
ANSI 150,300(DN50～DN400)
End connection: Flangeless type (Wafer)
Flange GB PN0.6～6.3Mpa according to HG20596-97M,FM
ANSI CLASS150, 300 according to ANSI B16.5 RF and HG/T20615-97
Face to Face Dimension: wafer according to GB/T12221-1989 EN558:1995 AND ISO5752-1982
basic series 16
Flange according to GB/T12221-1989 EN558:1995 AND ISO5752-1982 basic series 14
Body Material: Please refer to table1 1
Bonnet Type： Together with body-45～+400℃
Packing Material: V-type compound packing, graphite compound packing,
graphite packing, Operating Temp. (As shown in table 2
Seal Gasket： Spiral wound gasket, Graphite with metal gasket, Zigzag gasket, Flat
gasket.
Specific materials and operated temp. range as shown in table 3.
Packing Gland ： Bolts impacted
Paint: Carbon steel shell surface required to paint, stainless steel or copper
surface without paint .
Trim
Valve plug: Tri eccentric forms，Please refer to figure 3
Flow characteristics: Approximate equal percentage (As shown in figure 4 and table 5)
Trim material: STD material assembly and operated Temp. shown in table 4,
structure of seal seat shown in figure 2.
Rotary angle: 90°
Actuator
Type: GTX-B series pneumatic rack and pinion actuators
Material: Cylinder body , Extruded aluminum alloy
Caps and Piston, Die- cast aluminum alloy
Action: DA double acting
SR spring return, air to open or air to close
Structural: Double piston Double air-chamber rack and pinion(DA) , please refer to figure 4
Double piston Spring return rack-and pinion (SR),please refer to figure figure 3.
Air Supply: DA 0.1~1.0Mpa,
SR 0.2~1.0Mpa
Working Temperature: -20℃~+150℃
Angle Rotation Adjustable Scope: 90°±4°
Signal Interface:1/8’G,NAMUR1/4’G,NAMUR1/2’G
Dynamic Medium: clear, dry, non-corrosive air and other gas.
Surface Protection: Caps and springs ,Powder epoxy painted;
Cylinder body, anodic oxidation treatment after sand blast.
Standard Configuration with Valve: please refer to table 6
Accessory
Positioner,Filter-regulator valve,Solenoid valve,Limit switch,
Valve position Transmitter,Handwheel,Booster relay,Air control valve,Pnumatic lock-valve,etc.
Performance
Travel time: please refer to table 6
Seat leakage: Metal seal is according to ANSI B16.104 ClassⅣ,ClassⅤ,soft seal is according to
ANSI B16.104 Class VI
Rated CV:As shown in table 6
Linearity:±5%（Without Positioner）,±1.5%（With Positioner）
Hysteresis:3%（Without Positioner） , 1.5%（With Positioner）
Start–end point error: ±2%（With Positioner）
Range ability: 50:1
Allowable pressure differential: As shown in table 7.1~7.4
Figure Size：Please refer to Figure 7 and table 8.1~8.2
Weight of product：Please refer to table 8.1~8.2
Special requests
Produced according to the requirements of customers, details as follows:
○Special inspection
Flow characteristic test，material test，low temperature test，steam test，non-damages test
○copper-free treatment
○completely oil-free,water-free treatment
○appointed coating
○special air piping and fitting
○dust and sand proof
○strong corrosion proof
○vacuum service
○stainless steel bolt and nut for exposed parts
○cold area proof
○tropical area proof
○Machining back of flange back
○With Sewage bolt
○Double packing
○Steam jacket
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