vacuum release meaning in English

真空释放装置

Vacuum release valve
真空放泄阀
Svrs standard specification for manufactured safety vacuum release systems for swimming pools , spas and hot tubs
游泳池水疗中心和热管用人造安全真空排放系统
Manufactured safety vacuum release systems for residential and commercial swimming pools , spa , hot tub , and wading pool suction systems
住宅和商用游泳池健康中心热浴盆和浅水池吸入系统用人造安全真空排放系统
Manufactured safety vacuum release systems for residential and commercial swimming pool , spas , hot tub and wading pool suction systems
住宅区和商业区游泳池健康中心热浴盆和浅水池水抽吸系统的人造安全真空排放系统