ELECTROMAGNETIC PUMP

摘要

A plug (68) for supporting the ball (64) of a suction check valve (60) used in electromagnetic pumps is formed from: a cylindrical part (68a) which has, at the axial center, a center hole (69) having an inner diameter that is smaller than the outer diameter of the ball (64) and which receives the ball (64) at the edge on one end; and a flange-shaped base part (68b) which extends in the radial direction from the edge on the other end of the cylindrical part (68a). A tapered surface (69a) is formed on the cylindrical part (68a) at a section that comes into contact with the ball (64). It is possible to determine the position of (to center) the ball (64) by means of the tapered surface (69a). As a result, it is possible to prevent the actuation oil of the suction check valve (60) from leaking without causing the position of the ball (64) from becoming offset even when minor errors related to the measurement and assembly of the suction check valve (60) occur.