The STU-G1 is an in-line hydraulic throttle check valve used to regulate the flow of oil to a specific part of a circuit. It features a built-in check valve that allows fluid to pass freely from port B to A, while providing manually adjustable throttling (restriction) from port A to B. The valve is housed in a robust carbon steel body with a specialized surface treatment for high corrosion resistance. Its internal hardened steel components ensure a precision seal, making it ideal for high-pressure industrial applications where consistent actuator speed is critical.