Moog Servo valve

R

Thread Starter

Rabia

We had Moog's servovalve 770-144E installed on GCV of our Gas Turbine. A new model was purchased around April. However it turned out faulty. Now that we want to purchase another piece, Moog fatory suddenly says that "its production" has been stopped.

We have model 771K200 installed on a new GT being commissioned recently. Are these two models interchangeable?

Does anyone know where we can buy the 770-144E model from??

 
This is an excellent question for Moog. Since you've already contacted them, you can contact them again and ask this question of them to be most certain of any response you might get here.
 
Our warehouse department contacted one of their sales office in singapore and then they contacted their factory.

there is absolutely no info available of their products on site. There is no way to contact the factory (email IDs of sales office given only). I tried posting this query on their "ask experts" option, but even the query doesn't get posted.

We kinda need this 700-144E piece urgently. Do you have any info??
 
You say the one you originally installed failed relatively quickly. You should be contacting Moog for warranty replacement, unless there's something we don't know about how the servo failed.

Have you tried cleaning the internal filter?

There are several companies who have indicated on posts to control.com that they refurbish Moog servos and may have refurbished parts available for quick shipment. Have you searched control.com for the names of these companies? (Search with "Moog" or "servo".) They might even be able to help you with your question about interchangeability.

It has been reported on control.com that they are slow to respond to emails.

Have you tried contacting the corporate office in the US?

We don't know a lot about the two turbines at your site. We don't know about any differences between actuators or hydraulic systems. If you believe that the actuators and manifolds that the servos are bolted to are the same, then you could try taking one of the other servos and installing it on the older unit and try stroking the device and see if it works properly. If it doesn't, you have your answer. I don't think you'd hurt the servo, but that's just a guess. You, being on site, are in the best position to understand any differences. Use the parts manuals and drawings to help. Sometimes the servo port functions are identified on the P&IDs; sometimes they aren't. Sometimes they are identified on the piping arrangement drawings or the servo arrangement drawings, sometimes they aren't.

Use the tools you have and your best judgment--if you don't want to or can't call the Moog corporate offices in the USA or can't get support from their local office in Singapore. Sometimes, you just have to be persistent and keep calling and asking for help until you find the person who can help you.
 
We purchased a model 700-144E in April from Moog (through contact with Singapore office). however when it was installed, it didn't work. the signal coming from Mark V would get reduced to zero. We found out there is something going wrong within the servo valve as everything else was checked and found OK. We doubted that the mark V output is getting internally grounded.

So, it was sent back to Moog's factory in USA through their Singapore office. They are "still" investigating. Now meanwhile we are out of stock and urgently need to purchase the same servo. But now they say that its a 'legacy valve' and they have 'stopped its production'. We are in correspondence with them but its a very slow process.

Nowadays a new GT is under commissioning at our site. Frame 5 of GE. I checked the servo that GE supplied with it and its model 771K200. So i need to know if these two are interchangeable so that i have an option of using this one if there is any need at site.

Moog has been slow in responding again. That's why i reverted to control.com. Generally one gets a solution rather soon here.

And yeah, i searched on control.com. Found two relevant links. posted my query there too. There were contacts of people who claimed to stock and repair Moog valves. so am checking them too.
 
And actually i don't have a spare of the new servo that is installed on the GT under commissioning. That's why i cant proceed with that testing option either. God i am stuck!
 
I did a quick search of control.com and found the following links:

http://control.com/thread/1026233484#1026233997
http://control.com/thread/1026233325#1026239442
http://control.com/thread/1224053683#1224781209
http://control.com/thread/1026233325#1026233419


</b>Of course, you could always call GE Parts Edge and buy the part from them; they probably have it but, as we all know, they don't really want to sell it (the high price indicates they really want to keep it in their warehouse!).

You're on your own, now!
 
Hello,

Hope We can help you about this servo valve. We can produce the servo valve for you to replace the MOOG's. Of course, we also can help you do deal with all the technology problems .

Besides, we can supply the major repair service for you with a correct price. I can assure it will not like the MOOG's price.

Well, if you don't think we can help you, Sorry to interrupt you !

Hope we can become friends!

Huatong Hydraulic pneumatic manufacturing co.,LTD

Jasson

Add: No.10, East XinMing Road, DongTing Town, WuXi, Jiangsu, China

Tel: (86&#65289;0510-88201238
Fax: &#65288;86&#65289;0510-88700320
Mobile:&#65288;86&#65289;13485038798
Msn: editor_qw [at] yahoo.com.cn
E-mail: wxhuatong [at] yahoo.cn
Website: http://www.htqy.com http://wxhuatongyeya.en.alibaba.com
 
F

Faseeh-ur-Rehman

You can overhaulled&serviced the above mooge assembly its repair kit also available. In which following must be checked

1 coil resistance

2 Filter if dirty clean or replaced

3 All O rings mustbe replaced

4 Hydraulic oil checking if dirty replaced.

Regards
FUR Ansari
PPL Sui Gas Field
Pakistan
 
Rabia,

Refer to http://www.control.com/thread/1234256771#1234339085.

FYI, the Moog servo used for the GE FR5001 are all interchangeable (SRV, GCV, IGV).This Moog servo valve is standard 5GPM and requires +- 10mA. Again, you can get the spec. of the servo from its label on the body. If the spec. on the old servo is matching with the 771K200 spec. you can interchange them.

If you need more assistance, you may email me at [email protected]

Good Luck...
A. Oztas
 
They are not interchangeable.
770-144E for Low Hydraulic Pressure (300 Psig) while 771K200 for High Hydraulic Pressure (3000 Psig)
 
D
new is available for about $13K Most likely you contaminated the valve a 40 micron particle wil jamup the valve Moog can rebuild the valve for about $3,500.00 worse case.
 
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