• The valve is normally pushed to the left side by spring force. When 1 range is selected, line pressure (5) is transmitted to low reducing pressure (10). Low reducing pressure (10) is then also applied to the left end of the valve, pushing it to the right side. As a result, line pressure (5) is disconnected from (10) and the low reducing pressure is drained. Thus, the pressure is lowered.
• If the low reducing pressure (10) decreases, the force that pushes the valve to the right side also decreases, allowing the valve to move to the left side by spring force. This closes the drain path.
• In this way the valve balances with spring force, and low reducing pressure (10) becomes lower than line pressure (5).
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