NON-RETURN VALVE AND SELF-PRIMING PUMP

摘要

PROBLEM TO BE SOLVED: To provide a non-return valve which unfailingly prevents reverse flow of a liquid.;SOLUTION: A non-return valve 7 of the invention has: a valve seat 15 having a seat surface 15a and in which a passage 15b extending from the seat surface 15a is formed; a valve body 16 which closes the passage 15b when contacting with the seat surface 15a and opens the passage 15b when separating from the seat surface 15a; and a hinge mechanism 18 which is provided in the valve seat 15 and rotatably supports the valve body 16. The seat surface 15a is perpendicular to the passage 15b. The valve body 15 has a first surface 16a which contacts with the seat surface 15a, and a second surface 16b at an opposite side of the first surface 16a. A weight 23 is fixed to the second surface 16b.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2018,JPO&INPIT