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   Products > ... General Troubleshooting Charts > Control Valve Leaks Oil

Control Valve Leaks Oil

Possible Causes:


Tie bolts too loose (on valve stacks).

Use manufacturer’s recommendation to adjust tie bolt torque.

Worn or damaged O-rings.

Replace O-rings, especially between valve stacks. If contamination has caused O-rings to wear, clean system and look for source of contamination.

Broken valve parts.

If valve is cracked, look for a cause like too much pressure or pipe fittings that are over tightened.

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