ELECTRONICALLY CONTROLLED REGULATOR

An electronically controlled regulator may include a pressure regulating valve. The pressure regulating valve may include a valve shaft, a valve seat, and a discharge pressure regulating unit. The discharge pressure regulating unit may regulate a pressure of a fluid by causing the valve shaft to reciprocate through driving of an electric motor electronically controlled to change a distance between a valve body and the valve seat. A high-pressure fluid introduced from an introduction port may be discharged from a discharge port as a depressurized fluid at a set pressure on a side of a discharge pressure chamber while being depressurized and regulated. A seat diameter of the valve seat, a first seal diameter of a first seal member on an atmospheric pressure chamber side, and a second seal diameter of a second seal member on a pressure control chamber side may be substantially the same.