公司名称：广州奥丽斯特燃气设备有限公司

功能
节流型泄压
大流量
尺寸小
简单可靠
设计紧凑
规格
阀体尺寸和端口连接方式
289A 和 289U 型：1/4 NPT
289H 型：1，2 NPT
289HH 型：1 NPT
289L 型：3/4，1 NPT
289U 型：1/4 NPT
允许的*大泄压（入口）压力
100 psig / 6.9 bar
泄压设定压力范围（5 个型号）
5"wc 至 50 psig / 25mbar 至 3.5 bar
取压方式
内取压
温度适用范围
丁腈橡胶 (NBR) 和氯丁橡胶 (CR)：-20 至 150°F / -29 至 66°C 氟橡胶 (FKM)：20 至 300°F / -7 至 149°C 仅 289H 和 289HH 型
大致重量
289A 和 289U 型：0.75 lb/0.3 kg 
289H 型：1 NPT - 4 lb/2 kg, 2 NPT - 15 lb/7 kg
289HH 型：4 lb/2 kg
289L 型：15 lb/7 kg
289H：泄压压力调节范围
0.5 至 2.25 psig / 34 至 155 mbar
289H：*大泄压（入口）压力
25 psig / 1.7 bar
Fisher 289 Series relief valves are spring-loaded throttling relief valves used as downstream pressure regulators to protect the system from overpressure. A smooth throttling action minimizes pressure surges in the system during relief operation. 289 Series relief valves are ideal for low-pressure settings due to the increased sensitivity provided by a large diaphragm area. 289 Series relief valves are designed for pressure control; they are not ASME safety relief valves.
Features
Throttling Type Relief
High Flow Rates
Small Size
Reliability Due to Simplicity
Compact Design
Specifications
Body Sizes and End Connection Styles
Types 289A and 289U: 1/4 NPT
Type 289H: 1, 2 NPT
Type 289HH: 1 NPT
Type 289L: 3/4, 1 NPT
Type 289U: 1/4 NPT
Maximum Allowable Relief (Inlet) Pressure
100 psig / 6.9 bar
Relief Set Pressure Ranges (5 models)
5wc to 50 psig / 25mbar to 3.5 bar
Pressure Registratio