relief pressure valve的用法和樣例：
例句
- No relief valve is required where two pressure reducing valves are installed.
如果裝上兩個(gè)減壓閥，就不需要安全閥。 - 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。 - Remove the elbows from the relief valve base.
從安全閥底座拆卸彎頭。 - Never plug the discharge of a pressure safety relief valve!
絕對不要堵塞壓力安全閥的排泄口！
