Triple Off set Butterfly Valves
Triple Off set Butterfly Valves
(OP)
Q1 Why use a Triple Offset valve over a Double Offset valve.
Q2 What application would a triple be used.
Q2 What application would a triple be used.
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Triple Off set Butterfly Valves
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Triple Off set Butterfly ValvesTriple Off set Butterfly Valves(OP)
Q1 Why use a Triple Offset valve over a Double Offset valve.
Q2 What application would a triple be used. Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
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RE: Triple Off set Butterfly Valves
http://www.eng-tips.com/viewthread.cfm?qid=126483
For your second question, it is my understanding that triple offset valves are used in applications where low-leakage is a must and gaskets are not practical. High temperature gases would be a good candidate for example.
Best companies for triple offsets are Xomox, Velan, Dezurik, Tricentric and Adams.
RE: Triple Off set Butterfly Valves
As an addition to above, European experience, to highlight the uses for centric contra double eccentric contra triple eccentric:
For pure (particle free) water distribution and purification, water pipelines and hydroelectrical power plants you would normally not use triple offset because of cost and availability.
Double offset (double eccentric) would normally be higher in cost than centric butterfly valves for theese applications, but double eccentric would give an advantage in cost/lifetime and dependability. The benefit would increase with diameter and pressure classes. Double eccentric are used at least up PN25 (pressure class 25 bars) before you go for other special valve constructions, but normally not (?) triple eccentric valves.
For water the double eccentric valves would be leakage thight to the normal required leakage tests and rates.
This would lead you back to the typical applications for triple eccentric QMax1 has given.
RE: Triple Off set Butterfly Valves
RE: Triple Off set Butterfly Valves
Triple-offset, metal seated valves may be used in many processes of oil & gas, chemical, power generation, pulp and paper and other industries (where "piggability" is not a must, of course), including replacement of existing ball or gate valves, for both control and on/off sevices (with the proper actuation)... but in the last years, with the growth of LNG business, they also found more and more success in cryogenic applications.