Back to all butterfly valve
Flange butterfly valve
As a china butterfly valve manufacturer, judberd can manufacture concentric flanged butterfly valve, double eccentric butterfly valve, photos are as below
Flanged butterfly valve
Design conform to EN593
Concentric type
Length U type butterfly valve with short structure and normal length according to EN558-1
Material ductile iron
Disc ductile iron or steel
Sealing resilient seated
Operation lever, worm gear, Electric actuator, pneumatic actuator
Flanged butterfly valve
Design conform to EN593
Eccentric type
Length Series 14 is long structure ,series 13 is short structure
Material ductile iron
Disc ductile iron or steel
Sealing resilient seated
Operation lever, worm gear, Electric actuator, pneumatic actuator
Flanged butterfly valve image
Flanged butterfly valve can be many different design and material to suit for different fluid or gas requirement.Below are our product photos
Flanged butterfly valve for underground pipeline
Sometimes we need to install flanged butterfly valve underground, then we need extension spindle to extension the operation to ground, below is our flanged butterfly valve with extension spindle drawing
Difference between horizontally installed Butterfly valves and vertically installed butterfly valve
Butterfly valves can be installed horizontally and vertically
1、Horizontally installed valve shaft in the horizontal direction, the valve well width should be larger.
2、Vertically installed valve shaft in the vertical direction, the valve well will need to be very deep.
3、Horizontally installed butterfly valve is good choice for vertical arrangement of the height is restricted occasions. It can effectively avoid the high temperature radiation above the valve. The disadvantage is that it takes up a lot of space.
4、Vertically installed butterfly valve takes less space and is easy to install, the disadvantage is that if the pipeline is high it is not conducive to maintenance.
Difference between concentric and double eccentric butterfly valve
Concentric butterfly valve
1, The core of stem, disc and body is same
2, Sealing method is resilient seated, can’t be metal seated because valve body and valve disc have a large contact area. Because it is resilient seal, can’t used for high temperature fluid or gas
3,Connection ends can be wafer, lug, flange ,groove etc
4, Open and close resistance is large, the valve disc has a large contact area with the valve body, easy to wear, short service life.
Double Eccentric butterfly valve
1. The core of the stem is not same as the disc and body
2. Double eccentric butterfly valve can resilient seated or metal seated, metal seated type can be used for high temperature fluid or gas.
3.Connection ends is flanges
4. Compare to concentric butterfly valve ,the disc of double eccentric butterfly valve can separate with seat immediately once the disc is open,There is no significant friction between the valve disc and the body as in the concentric butterfly valve, thus reducing the opening torque and the wear on the sealing surfaces.
5, Double eccentric butterfly valve can’t afford higher pressure.
How to install flange butterfly valve?
1. Check the design of the pipeline to confirm whether the flange butterfly valve is to be installed vertically or horizontally
2, Place the flange butterfly valve into the pipeline in accordance with the installation position
3, align the flange of the butterfly valve body with the flange connected to it in parallel, not skewed
4, Put the flange rubber ring into the middle of the two flanges to be connected,only one rubber ring for two flanges
5, first install the bolts of the positioning holes on the flange butterfly valve, tighten them according to the diagonal order, but don’t tighten them too much, then install the other bolts, tighten them evenly in several times according to the diagonal position. Make the tightening force of each bolt as even as possible.
