Gas-over-oil actuators, utilizing the scotch yoke mechanism, are engineered to provide a consistent output torque across the full 90° stroke, accommodating typical ball valve torque requirements. These actuators operate by compressing hydraulic oil with line pressure, making them highly effective for quarter-turn valves. They are especially favored in natural gas pipelines for their reliable on/off control capabilities, utilizing high-pressure natural gas or nitrogen as the actuator supply.
