| 摘要 |
PROBLEM TO BE SOLVED: To prevent a valve from biting at a valve seat of a seated part in an opening/closing valve, and to suppress a drastic increase of a flow rate of a fluid flowing in an opening at the primary stage of an increase in area of the opening formed between the seated part and the valve seat. SOLUTION: In the opening/closing valve which is constituted in such a manner that a small diametral hole 77 and a large diametral hole 79 are continuously provided in a valve body 47 via the valve seat 81, and at the same time, a poppet valve element 51 having the seated part 87 capable of seating and separating to/from the valve seat 81 is freely slidably fitted and inserted into the large diametral hole 79 so as to make the space between the small diametral hole 77 and the large diametral hole 79 to communicate with each other or block, mutually the seated part 87 is made into a conical shape with a prescribed angle and the valve seat 81 is made into a stepped columnar shape, and at the same time, a flow rate regulating means (a variable throttle C), which is formed between the seated part 87 and the valve seat 81 and regulates the flow rate flowing in the opening at the primary stage of the increase in area of the opening in which the area is increased according to a separation degree from the seat, is provided. COPYRIGHT: (C)2003,JPO
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