| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve with a pressure relief valve having a reduced manufacturing cost.SOLUTION: A main valve of a check valve 18 comprises: a check valve seat 31 internally disposed on a case 30; a check valve body 37 supported in the opening and closing direction; a packing 45 attached to the check valve body 37; and a spring 44 which biases the packing 45 in the direction of the check valve seat 31. A pressure relief valve comprises: a valve hole 40 formed on the check valve body 37; an inner annular part 45b of the packing 45 which functions as a valve body; and a spring 47 which biases the inner annular part 45b in the direction of the check valve body 37 in which the valve hole exists. The valve body of the pressure relief valve is shared with a part of the packing 45 as the valve body of the main valve and, thereby, a component which constitutes the valve body of the pressure relief valve is made unnecessary. The spring 47 of the pressure relief valve is configured so as to be arranged on the outer circumference of a second shaft part 39 of the primary side, thereby, it is prevented that the size of the component becomes too small as compared to the case of being internally disposed in the shaft part and the assembling operability is improved. |
