| 摘要 |
The utility model provides a pilot-operated type magnetic valve. Components like a piston ring are not used in the pilot-operated type magnetic valve, so values(Cv) of the back space of a piston flowing from a primary side connector (21) to the upper portion of a piston valve (1) arranged in a piston chamber (31) are restrained, and movements of the piston valve (1) are stabilized. A plurality of annular grooves (11a) are formed in the periphery of a piston portion (11) of the piston valve (1), wherein the inner wall (31a) of the piston chamber (31) and the piston portion (11) of the piston valve (1) are oppositely arranged. Thus, a labyrinth structure (11A) is arranged. Shape parameters of the labyrinth structure (11A) are set. The groove angle theta, the groove depth D and the pitches P of the grooves are set to be: 15 degrees<=theta<=40 degrees, 0.2 millimeter<=D<=0.6 millimeter, and 0.2 millimeter<=P<=0.6 millimeter. |
