Abstract: Provided is a linear solenoid valve having at least one notch that opens on an end surface of the land of the spool on the drain chamber side and is formed on an outer peripheral surface of the land. In response to movement of the spool, a state is formed in which the end surface of the land on the drain chamber side is located inside the communication chamber and the output chamber and the drain chamber communicate with each other via the notch and the communication chamber, and a state is formed in which the end surface of the land on the drain chamber side is located inside the output chamber and the output chamber and the drain chamber communicate with each other via the communication chamber.

Abstract: A filter retainer supports filtering materials on both surfaces of the filter retainer. A pair of etched circular plates having a large number of circumferentially arranged through-holes formed by chemical etching are joined to each other at a condition where the positions of corresponding through-holes are aligned to coincide with each other, and at the joined form, radially extending internal paths are formed between the pair of etched circular plates. The structure of the filter retainer avoids accuracy and pressure loss of conventional filter elements cause by internal structures thereof.