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Compensation valve compressor/expander combination

Compensation valve compressor/expander combination

Compensation valve compressor/expander combination

(OP)
In our plant we have a few compressor/expander combinations to produce cold.
The expander is driving the compressor.

One of this combinations has a "compensation valve" the use of this valve is clear. At the start-up it compensates the axial forces who are generated by the expander, since the compressor is still running in bypass and does not create his own axial forces to compensate the ones of the expander.

Ok, that's clear to us. Now I have a question. Why has only this particular combination the "compensation valve"? The others don't have one.

We are thinking it is that because this machine is running on much higher pressures then the others, but also this one is the oldest combination we have, so it can also be something which is used in the past.

Does anyone know the answer?
Thanks,
Cryotechnic

"Math is the ruler of your potential succes...."

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