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June 11, 2012 at 1:54 pm #4618
Two things to keep your Delta Valves working properly: steam supply & hydraulic fluid cleanliness.
Monitoring your steam supply to the bonnets will provide indication of the gate and seats condition.
The hydraulic fluid and the HPU require filter changes (typ.) every four to six months.
The valves can be serviced at the turnaround replacing the seats and gates.