So less water means lower pressure. It does this by opening an internal valve based on the system pressure and the spring tension set on the valve.
通过固定孔的水量越多，压力就越大，反之水量少压力也小。
The inner hole wall of the middle nest is provided with a draw limiting convex rib, and the tension spring contacts the lower end of the convex rib.
该中巢的内孔壁上设有限拉凸筋，张力弹簧抵靠该凸筋的下端。
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