Flanged Centric type butterfly valve
  • Product Details

Flanged concentric disc butterfly valve technical parameters

Technical Data

1. Equipmentusedin regulating or cutting off medium in pipeline.

2. Suitable for handies(DN50-300), Gear Operators, electric and pneumatic 

control actuators

3. Standards of design and manufacture confoml to GB/T12238

4. Pressure test confoml to GB/T13927

5. Structure lengrth meet to GB/T12221

6. Side flange standard meet to GB/T17241.6.

7. For installation infomiation, please refer to "Operation manual of installation 

and maintenance".

Curve of Flow Rate

Note: Performance curve of fow volume means the relationship 

between open degree of valve and flow volume. Norally butterfly 

valve suitable to use in control fow. Whenvalve's open degree 

under 30°, not recommend to use in flow volume control.

Flanged concentric disc butterfly valve ST026 D341X

- Driving device flange

Can be used in handles, gear operators, electric or pneumatic actuators.

- Bushing

Reduce driving torque.support stem, and effectively separate it with valve bodyreduce wear of stem.

- Surface of disc axle hole

Through treatmentofpolishing, precisely fit with seat.

- High precision disc external profile

Reach the requirement of bubble-tight, small start and stop torque, longerusage life ofseat.

- Stem seal

Stem is not easy to be distorted, eliminating possible leakage in stem.

- Strong precision key

Give possible attachment for manual lever or actuator.

- Precision taper pin

Ensure positive vibration proof. Stem to disc connection.

Easily feld replaceable.

- Integralstem design

High precision and reliability, convenient for start.

- Side seal

With no need of flange gasket.

- Body lined with rubberseat

Good integralsupport, stable and solid, stretch-proof, leakage-proof.

- 0-ring

Prevent leakagein axle end

Concentric Flanged Butterfly Valve Overall Dimension PN10 . Pn16

DN50 to DN1000    CV Valve-Flow Rate Coefficient

DN50 to DN1000 CV Valve-Flow Rate Coefficient

CV=when valve entirely opened,pressure difference in both sides of valve will be 1 pound/inch2 ,when fluid is 60°F clean water,flow volume of per gallon/min.flowing through valve .

CV=Q(G/△P) 1/2       Whereas: G=Specific gravity, clean water will be 1.0 Q=Max fow rate

△P=Pressure difference, lb/in2

C=The valve CV is the flow rate(m3/h) of pure water at normal temperature passing through the valve when the valve disc is fully opened and the pressure differential between the two ends of the valve is 10Kpa(1Kg/cm2 ) CV=1.17C

Actuator Technical Parameters of the Concentric Flanged Butterfly Valve

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