mov valves

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090408-1836 EST

What is a limitorque valve? The British call radio tubes valves, but I do not think this is what you mean by valve. So does this valve control the flow of solids, liquids, gases, or something else?

Limit torque seems to imply something limits torque to the shaft that controls the valve opening. Is that mechanical or electrical torque limiting and what is the purpose?

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puckman said:
anyone ever work with limitorque valves? I seem to be having trouble with one thats been installed since 1992 and can use a little help.
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I've worked with a few different models... mostly just wiring them up per drawing... but in one situation I did have enough knowledge to distinguish the physical terminals didn't match the drawings' :grin:

So in what way do you need help?
 
I was having trouble opening and closing the valves electricaly. I adjusted the four limits but was never able to get it fixed. It was working for years . Co. calling in valve people. It seems simple enough, but i spent way too much time on it.
Thanks to every ones help.
 
What model? Do you not have a print for that model? There pretty easy to troubleshoot if you have a print.

We have many here at the plant. We have been changing out the older model to the new MX and QX models. They are great. No mechanical limits to set. They have optical encoders for positioning. So all you have to do to set a position or aux contact is push a button in setup mode.
 
we have a ly 2001. i think it must be in the wiring outside the valve. we set the 4 ls they all ring out when tested . checked the torque switches . they have 24 v on the ls and 120 v on the heater and 120 v for the motor. thanks again
 
puckman said:
we have a ly 2001. i think it must be in the wiring outside the valve. we set the 4 ls they all ring out when tested . checked the torque switches . they have 24 v on the ls and 120 v on the heater and 120 v for the motor. thanks again
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Just in case you need it, here is a link to the installation and maintenance manual.

BTW, you still have not stated what the problem is. Please enlighten us :wink:
 
problem, press open , valve will open.
press close and valve does nothing. pull in decluch and turn wheel just a little and valve will close right then on its own. can not get it to close .
 
puckman said:
problem, press open , valve will open.
press close and valve does nothing. pull in decluch and turn wheel just a little and valve will close right then on its own. can not get it to close .
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A few questions:

Was any type of maintenance performed on the unit before this started happening?

When you rang out the position and indication LS's, did you ring them out at both full open and full closed valve positions... i.e. determine exact trip positions of each LS?

When in declutch mode and you turn the wheel, are you turning it toward valve close or valve open?

...and before we get too far into this, are the "valve people" coming to fix it? If they are, there is little point in going through a troubleshooting routine. However, I suggest you be there if permitted when they determine the problem, or at least attempt to learn what they did to fix it. They may not be very forthcoming if you are not there to observe... after all, to keep you in the blind is job security for them (and less for you) ;)
 
i checked the ls in open position , also turned the wheel [i think] to the close direction. the valve people are coming next week sometime, but i will try to work on it if i can, i hate to not be able to fix something that seems so straight forward. i don't believe any work was done on valve before the problem started. it has about 10 control wires to the valves from 2 120v relays [ open-close] and maybe 3 24 v relays. they are interlock with 2 other valves[auma] . only one valve can be openned at one time. one of the other 2 is working and one is not.
 
puckman said:
I was having trouble opening and closing the valves electricaly. I adjusted the four limits but was never able to get it fixed. It was working for years .
Click to expand...

If it worked for years I highly doubt adjusting the limits was the right direction to go.
 
puckman said:
i checked the ls in open position , also turned the wheel [i think] to the close direction. the valve people are coming next week sometime, but i will try to work on it if i can, i hate to not be able to fix something that seems so straight forward. i don't believe any work was done on valve before the problem started. it has about 10 control wires to the valves from 2 120v relays [ open-close] and maybe 3 24 v relays. they are interlock with 2 other valves[auma] . only one valve can be openned at one time. one of the other 2 is working and one is not.
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The fact that you can slighty reposition the valve mechanically to where it will operate electrically suggests a limit switch is out of alignment.

After looking over the schematic, it sounds like the valve has been custom wired. I say this because the schematic indicates internal control being at full line voltage, and remote control relying on internal control as the source of control power. There is no 24V. Everything is powered across L1 and L2. This makes it most difficult to help troubleshoot from here without an as-wired schematic.
 
no i don't have any external drawings , what i do have is in work and its a small line diagram made by the elctrician who wired it years back who is not there anymore.
 
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