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Yes, the gate valve is leaking at the stem.
Yes, the valve under the sink is leaking.
The needle valve or flow valve controls the flow of gas into the Bunsen Burner.
Is the T and P valve leaking in your system?
Is the fill valve leaking in your plumbing system?
Is the pressure reducing valve leaking in your system?
Is the pressure regulator valve leaking in your system?
Is the sink valve leaking in your kitchen or bathroom?
Is the temperature relief valve leaking in your system?
No, the water main valve is not leaking in your home.
Is the main water valve in your home leaking?
Root valve.