Patent ID: 8844557
Filing Date: 2014-09-30
Classification: F16K,Y10T

Abstract:
1. A float valve device, comprising: a housing which has a cylindrical shape, and which is separated into a lower space and an upper space through an intermediation of a partition wall, wherein an air pipe that allows the upper space to communicate with an outside thereof is attached to an outer wall of the upper space, an opening portion is provided in the partition wall, a valve seat is formed on a lower surface of the opening portion, and a communication hole that allows the lower space to communicate with an outside thereof is formed in an outer wall of the lower space; a float which is disposed in the lower space of the housing to be vertically slidable, which has a protruding portion provided on a center of an upper surface thereof, and which comes up by a liquid flowing through the communication hole of the housing, wherein the protruding portion is formed so that a center thereof is highest, and a periphery thereof becomes gradually lower from the center; and a movable valve which is supported on an upper portion of the float to be freely swingable with respect to the float, wherein the movable valve includes a movable valve main body and an elastic valve member mounted on an upper portion of the movable valve main body, and wherein a receiving portion is provided on a lower surface of the movable valve main body, wherein the receiving portion includes an annular protruding portion that protrudes from the lower surface of the movable valve main body, a center hole formed in a center of the annular protruding portion, and a guiding recessed portion which is provided between the center hole and the annular protruding portion, wherein the guiding recessed portion is a tapered portion that starts from an open periphery of the center hole such that the guiding recessed portion starts with an inner circumference periphery at a side of the center hole and the guiding recessed portion becomes gradually shallower from a side of the inner circumference periphery toward an outer circumference periphery of the guiding recessed portion at a side of the annular protruding portion, wherein when the float comes up to a predetermined height, the movable valve abuts on the valve seat to thereby close the opening portion and the periphery of a top portion of the protruding portion of the float abuts on the inner circumference periphery of the guiding recessed portion without the top portion of the protruding portion of the float abutting on the movable valve, and wherein a value of an angle of the tapered portion of the guiding recessed portion is less than a value of an angle of a tapered portion of the periphery of the top portion of the protruding portion of the float, such that the periphery of the to portion of the protruding portion of the float maintains linear contact with the inner circumference periphery of the guiding recessed portion even when the protruding portion of the float abuts obliquely on the receiving portion of the movable valve.