功能
節流型泄壓
大流量
尺寸小
簡單可靠
設計緊湊
規格
閥體尺寸和端口連接方式
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
允許的*大泄壓（入口）壓力
100 psig / 6.9 bar
泄壓設定壓力范圍（5 個型號）
5"wc 至 50 psig / 25mbar 至 3.5 bar
取壓方式
內取壓
溫度適用范圍
丁腈橡膠 (NBR) 和氯丁橡膠 (CR)：-20 至 150°F / -29 至 66°C 氟橡膠 (FKM)：20 至 300°F / -7 至 149°C 僅 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：泄壓壓力調節范圍
0.5 至 2.25 psig / 34 至 155 mbar
289H：*大泄壓（入口）壓力
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 |
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