最低% D FR回路阀是指标阀，将保持在全开的位置。
The lowest % DFR circuit valve is the index valve and will remain in the fully open position.
将旋钮旋转到全闭的位置，然后旋回到全开的位置，测试是否旋转灵活。
Rotate knob to full-closed and back to full-open to test for free rotation.
在正常操作中，远程客户机用一个ACK数据包进行响应，这会使半开的连接转换为全开的。
In normal operation, the remote client responds with an ack packet that moves the half-open connection to fully open.
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