"COS" feature on electric actuators. What is meaning?
"COS" feature on electric actuators. What is meaning?
(OP)
Hello:
I use electric actuators for motorized valves and dampers in power plants applications.
In some catalogues of electric actuators, I have seen a column entitled "COS" and has some values, usually from 0.6 -0.9.
I can't found what is the mechanical meaning of this feature, and how it's related with the quality or benefits of an electric actuator.
I will really apreciate comments. Thanks in advance.
I use electric actuators for motorized valves and dampers in power plants applications.
In some catalogues of electric actuators, I have seen a column entitled "COS" and has some values, usually from 0.6 -0.9.
I can't found what is the mechanical meaning of this feature, and how it's related with the quality or benefits of an electric actuator.
I will really apreciate comments. Thanks in advance.





RE: "COS" feature on electric actuators. What is meaning?
It refers to the Power Factor (PF) of the electric consumption.
PF= cos phi
If cos phi = 0.6, it means PF= 0.60
RE: "COS" feature on electric actuators. What is meaning?
RE: "COS" feature on electric actuators. What is meaning?
RE: "COS" feature on electric actuators. What is meaning?
RE: "COS" feature on electric actuators. What is meaning?
just a hunch..ask the mfr as quark recommended..
RE: "COS" feature on electric actuators. What is meaning?
Could you post all the data displayed for the referred electric actuator?
It will be wise to analyze it considering what Quark is trying to mean.
RE: "COS" feature on electric actuators. What is meaning?
Which catalogs and which actuators?
RE: "COS" feature on electric actuators. What is meaning?
Next I include some specs. as apears on Catalogue:
S4 service - D.R. : 30%
Nominal type torque (lb-ft): 44
Output speed (RPM): 11
Time/turn (sec/turn): 5.42
Power(Kw): 0.1
Sped (RPM): 750
Current rated A: 2.5
Current start A: 3.0
COS: 0.95
Eficiency: 18%
This is an example of information that appears on specs.
Thanks everybody again for all you valuable comments.
RE: "COS" feature on electric actuators. What is meaning?
RE: "COS" feature on electric actuators. What is meaning?
Thanks for your interest on my reply.
Catalogues are for LIMITORQUE L120 Series (appears power factor in place of COS), BIFFI F01 series (same as Limitorque), ROTORK Series AQ (same as Limitorque), L.Bernard(COS in place of power factor)
With the help of all repliers (thanks aolalde,DickDV,quark,rbulsara), now specs. of manufacturers are clear and I can to choose best option on specific actuators.
RE: "COS" feature on electric actuators. What is meaning?
I would guess Limatorque sold the valves somewhere where english is not the native language. They want the nameplates in whatever so they hire a translator to rewirte nameplates and manuals. The translator looks up "Power factor" sees Cosine and put COS in place.
RE: "COS" feature on electric actuators. What is meaning?
Language is english, and valves are installed in México. Limitorque is prefered brand here. Thanks for your comments.
RE: "COS" feature on electric actuators. What is meaning?
Have you tried writing Limatorque?
http://www.limitorque.com/products/l120/apps.asp
They use to have good customer service. They are supposed to be keeping record on all those valves in the Nuke plants. I know a lot of those were changed out.
It was always scary checking out so,ething like an SMB4. I use to use an electrican at the valve, one at the MCC and one at the control panel when I tested them. All of them ready to throw a switch, breaker or clutch at a moments notice. If the limits weren't set the operator could drive the stem right thought the bottom of a valve.
Laguna Verde had a few Limatorques if I remember right, but there was some German made (Auma I think) and some Hatachis which were Limatorques made under license.
RE: "COS" feature on electric actuators. What is meaning?
Thanks for valuable comments.
I will write Limitorque in order to improve technical literature that I had.
RE: "COS" feature on electric actuators. What is meaning?