relay valve的用法和樣例：
例句
- Look for any signs of leaking between the gun and the unloader valve.
檢查一下水槍和減壓閥是否有泄漏的跡象。 - No relief valve is required where two pressure reducing valves are installed.
如果裝上兩個減壓閥，就不需要安全閥。 - The safety valve of his anger opened.
他控制怒火的安全閥打開了。 - There must be no valve between the relief valve and heater.
在安全閥和熱水器之間不能夠安裝任何閥門。
