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I would suggest using less downtime than a flush and fixing the leaking servo valve or install some type of drip pan to catch and collect the leaks.
Phosphate Ester’s are very sensitive to moisture, and break down to corrosive acids in the presence of moisture/water. In a super heated steam environment the probability of condensate forming is also high. It is imperative, that your arrest the leakage immediately, then deal with other issues. Also re-check composition of seals and gaskets, they must be viton or other synthetic rubbers only.
In conclusion you cannot change FR Fluid in Servo valves with general lube oil.
M Hussam Adeni
Fire resistant Hydraulic Fluid are used very purposely. high precision control at elaved temp without any hazad is must.
NAS4-7 is really a super claen oil. and can be achieved by electrostatic filtering machine.
i amnot expert in this subject but being a end user i have tried this in various applications in plant.
David Cummings ISOPur Fluid Technologies
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