Series 415 steam safety valves feature a stainless steel spring, a top guided stem and non-stick Teflon? disc to metal seating to assure positive shutoff.

• 系列415蒸汽安全阀配置不锈钢弹簧，一个顶部引导阀杆和不卡住特氟隆阀瓣对金属阀座密封，确保绝对关闭。