Who can help me?
Look at the following formulas
v = (354 * Q)/ DN^2 then Q = (v * DN^2) / 354
t = (5157 * Q ) / (DN^2 * dP)
Added those formulas together i get;
t = (14.56 * v)/ dP
For liquids v is aprrox. 5m/s
So the valve size is not a factor in closing time, only pressure?!? So the...
Hello to you all,
I know the dimensions for flat head, 'double d'. I use standard ISO EN 5211. But what can i use for machining 'single' flat head?
Is just the same as ISO EN 5211 and only machine one side at the stem / shaft?
Who can help?
Best Regards,
Mrctchlr
My question:
I need to registrate opening- and closing times according to EN161. Can i do it without appling a working pressure to the valve? In other words, can i test it 'dry'.
many thank in forward!
Dear all,
I am looking for a cheap limitswich box. A box with two mechanical V3 SPDT switches. The swichbox has to be in accordance with VDI/VDE3845.
Annual need about 600 pieces.
All help is appreciated!
Many thanks!
MT
My questions for you are;
What is the design life for a part-turn pneumatic actuator operating butterfly valves?. What is a endurance test for pneumatic actuators containg? What is the method?
Many manufacturer's of pneumatic actuators mention X cycles related to torque, but how have they been...
Dear All,
Who can name me some institutes or laboratoria that perform API607 or BS6755-2 valve tests.
Preferred are the one's in Europe or even more Benelux.
Thank you very much!
Regards,
MT
Dear All,
Every information about using siliconrubber in butterfly valves is welcom. Especially, the issue max. temperature
Thank you all in forward!
Regards,
MT
dear all,
"Cerified firesafe by Llyods to DOT Rule 54 App. D for use in fire water mains offshore and marine installations".
Who can tell me more about the DOT Rule 54 app. D. What does it contain or require?
In those mentionned installations, what is the most common seat design? PTFE with...
Hello to you all,
What is the most requested "performance class" (clients) for high performance butterfly valves?
Or, what should be the 'minimum' performance class a valve should satisfy?
Performance class defined by the combination of:
- tightness class
- endurance class
- temperature class...
Our company wants to let an institute (SwRi) to perform a fire safe test according to API 607 and BS 6755 on our high performance butterfly valve. I have to prepare the test valves. They have to be deliverd installed between pipe.
My Question is: "How do i get the flanges tight?"...
