Natural gas ball valve
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High-pressure gas ball valve: which one in the diagram is the vent port, the drain port, and the grease filling port? What types of maintenance are required for manually operated actuators? How to detect internal leakage and the methods for dealing with it.
In your first diagram, the one at the bottom is the waste discharge port, while the one at the top is the vent port. The grease injection port should be located on the actuator; it’s not possible to inject grease directly into the valve body. Those two areas on the sides are likely meant for static grounding.