短語詞組短語pressure vacuum relief valve 真空安全閥;呼吸閥;壓力真空安全閥pressure e relief valve 釋壓閥;泄壓閥pressure adjustment relief valve [機]調(diào)壓溢流閥pressure regulating relief valve 壓力調(diào)節(jié)安全閥pressure cap relief valve 壓力蓋安全閥pressure -relief valve spring 減壓閥彈簧Pressure e relief valve PRV 泄壓閥ratio pressure adjustment relief valve 比例壓力溢流閥 返回 pressure relief valve