How do you lubricate a Grinnell PIV?

To lubricate a Grinnell Post Indicator Valve (PIV), first ensure the valve is in the closed position. Remove the lubrication fittings or caps, and apply a suitable lubricant, typically a light machine oil, to the indicated points, such as the stem and any pivot points. Rotate the valve handle several times to distribute the lubricant evenly, then replace the fittings or caps. Regular maintenance should be performed to ensure proper operation and prevent corrosion.