To provide a fluid control valve operated by a low-energy signal and effectively operating in a wide range of pressure and flow conditions, especially to provide a flow control valve suitably used for make-up fluid feed system for a battery.

This high-gain fluid control valve assembly includes a body part 12 having one or more intake ports 18 and two discharge ports 20 and 22 positioned linearly. One discharge port 20 has a generally rigid valve seat 28 forming a first valve discharge port, while the other discharge port 22 has a generally flexible valve seat 42 forming a second valve discharge port. A valve member 30 for closing the first valve discharge port is generally flexible member, while a valve member 44 for closing the second valve discharge port is a generally rigid member.