| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure reducing valve capable of suppressing abnormal noise generated by turbulence by suppressing generation itself of the turbulence.SOLUTION: A valve element 12 of the pressure reducing valve includes a one-stage taper portion 23 seated on an inner periphery of a valve hole 31. On the inner periphery of the valve hole 31, a first area 33, a second area 34 and a third area 35 are formed in order from an upstream side in a flow direction a fluid. The first area 33 is formed so that, when the valve is open, height of a passage defined between the first area 33 and the one-stage taper portion 23 of the valve element 12 gradually decreases toward a downstream side in the flow direction. The second area 34 is formed so that the height of the passage is constant when the valve is open, and the entire second area 34 is in contact with the one-stage taper portion 23 when the valve is closed. The third area 35 is formed so that, when the valve is open, the height of the passage gradually increases toward the downstream side in the flow direction.SELECTED DRAWING: Figure 4 |
