| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a relief valve capable of checking with a simple structure whether or not the displacement resistance of a valve element and a valve rod has increased. <P>SOLUTION: A lower valve rod 10 and an upper valve rod 11 are formed integrally with the valve element 9. A lower guide hole 12 formed in a body 1 guides the outer periphery of the lower valve rod 10 slidably, while an upper guide hole 13 formed in a lid member 2 guides the outer periphery of the upper valve rod 11 slidably. A lower opening 16 and an upper opening 18, through which a measuring part of a weight measuring means that measures the weight of the valve element 9, the lower valve rod 10, and the upper valve rod 11 is inserted, are provided at the outer part sides of the lower guide hole 12 and the upper guide hole 13. During the operation of the relief valve, the lower opening 16 and the upper opening 18 are closed by a lower plug 17 and an upper plug 19 respectively as closing members. When the weight of the valve element 9, the lower valve rod 10, and the upper valve rod 11 is measured, the lower plug 17 or the upper plug 19 is removed to insert the measuring part of the weight measuring means from the lower opening 16 or the upper opening 18. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
