What is triple eccentric butterfly valves?
What is triple eccentric butterfly valves?
(OP)
as titile and what is the benefit of this valve?
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What is triple eccentric butterfly valves?
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What is triple eccentric butterfly valves?What is triple eccentric butterfly valves?(OP)
as titile and what is the benefit of this valve?
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RE: What is triple eccentric butterfly valves?
Triple eccentric means:-
1)First eccentric is the offset between the shaft centre line and the disc trunnion centre line.
2)Second eccentric is the offset between the body centre line and the disc centre line.
3)The third and the most important is the eccentric in the sealing(multiple) itself such that if you draw a imaginary contour line between the sealing shape vs the body centre,It becomes a cone with one side flat on surface.(I hope my words are clear enough to make you understand).
The reason for this shape is because it gives better sealing ability for the valve.eg:- Fire safe valves are triple eccentric valves which are also called pyrogenic valves.The sealings are multiple in nos. and together they form a pyrogenic shape therefore this sealing is also called pyrogenic sealing.
Cheers!
RE: What is triple eccentric butterfly valves?
RE: What is triple eccentric butterfly valves?
Regards, 'NGL
RE: What is triple eccentric butterfly valves?
In other words, you can reliably seal a triple offset butterfly valve against high pressures and high temperatures. The valve can be constructed from materials that will hold tight continuously against hundreds of psi pressure at temperatures in the 1000 degrees F range...
RE: What is triple eccentric butterfly valves?
SHRI
RE: What is triple eccentric butterfly valves?
Be careful a lot of Triple pffset valves are not fully rated in both directions in all applications!
RE: What is triple eccentric butterfly valves?
Larry
RE: What is triple eccentric butterfly valves?
Bye, 'NGL
RE: What is triple eccentric butterfly valves?
I believe that two things have been missed out which need clarification:
a)Triple offset valves do not have sealing surfaces which rub together, as the principle is to bring two cones together one inside the other the rubbing is eliminated.
Therfore the wear of the sealing surfaces is stopped unlike double offset valves where wear is significant.
b)Triple offset valves are 'torque seated' although they may have very low torques to operate the valve in the 'running' cycle(just after opening and just before closing), the torque is high to seat/unseat the disc.
This is because the valve 'sealing cones' are being pushed together and need to be 'held'. Imagine trying to push a countersunk screw into a matching hole, you need to 'hold' it in position. If the angles on the cones were very small then the disc would stick and never open i.e. taper pin
That should make it clearer.
B