Here are some typical maintenance tasks recommended for lt butterfly valve:

Exercise the valve quarterly by opening and closing to keep internal components lubricated and prevent seizing.

Inspect discs, shafts and seals annually for signs of wear, corrosion or damage. Replace worn parts as needed.

Lubricate valve shaft seals periodically using suitable grease to prevent leakage.

Clean valve internals if process fluid residues can cause corrosive damage over time.

Check actuator operation and adjust or service pneumatic/hydraulic units per mfr guidelines.

Replace resilient disc-edge seals, O-rings every 5-10 years depending on service conditions.

Tighten bolting and fasteners, especially on flanged valves which vibrate constantly.

Repair or rebuild valve if internal leakage is detected around the shaft or seat.

Consider replacing the valve body if metal is pitted or severely corroded.

Record valve attributes/service history for predicting part lifespan and scheduling maintenance.

Proactive maintenance detects issues early and helps butterfly valves achieve their expected 15-30 year design life span.