| 摘要 |
<p>PROBLEM TO BE SOLVED: To suppress the possibility that when refrigerant is compressed between a valve body and a valve seat to destroy bubbles, the destroying of bubbles causes an impulse wave, and the impulse wave collides with the valve seat, the valve seat is damaged by collision pressure of the impulse wave.SOLUTION: A valve seat 54e is formed of an aluminum alloy whose Vickers hardness is set to a value within a range of 128-135. The aluminum alloy contains silicon, copper, and magnesium, and the content of silicon is set to a value within a range of 3.5-5 wt.%.</p> |
