The shift mechanism incorporates a larger internal roller and stronger shift-spring tension for more positive shifting.
这种转变机制，内部集成了一个更大更强的转向辊，弹簧张力更积极的转变。
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。
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