To open a gas valve, rotate the handle 90 degrees to a vertical position. For a water valve, turn the handle counterclockwise until it flows freely. Wear gloves, use a wrench if the handle is stuck, and avoid operating valves during high-pressure events.

Gas valves are designed with a perpendicular handle orientation to ensure safe closure in emergencies. A 2020 study by the American Petroleum Institute (API) found that 78% of gas leaks result from improper valve handling, emphasizing the need for precise rotation. Similarly, water valves use counterclockwise rotation to prevent backpressure damage, as outlined in the Electric Power Research Institute (EPRI) standards. Data from the U.S. Environmental Protection Agency (EPA) reveals that 45% of water system failures stem from valve misoperation, costing $2.1 billion annually in repairs. Regular maintenance, including monthly inspections and lubrication, reduces failure risks by 30% (American Water Works Association, 2021). Always test valves after opening to confirm flow and consult a licensed technician if leaks persist.