Moog G631 / 631 is for a motion control valve with the highest performance. The G631 series flow control servo valves are throttle valves for 3 and preferably 4-way applications. Features: With high performance, With 2 stage design that covers the range of rated flows from 5-75l/min (1.3 to 20gpm) at 350 bar valve drop per spool land. With simple design With long life operation Suitable for elecrohydraulic position With high dynamic response requirements for speed, pressure, or force