Fisher 289P泄压阀功能特点：
经济实惠
低压升就能达到高放泄能力
操作后可快速重置
维护简单
经久耐用
紧固件耐腐蚀
全效流通能力
Fisher 289P泄压阀规格参数：
阀体尺寸和端口连接方式
1 或 2 NPT
**泄压（入口）压力
1 NPT：超过放泄设定压力 50 psig / 3.4 bar 或 110 psig / 7.6 bar，以较低者为准
2 NPT：15 psig / 1.0 bar
泄放设定压力范围
1 NPT：10 至 100 psig / 0.69 至 7.0 bar 之间的三个范围
2 NPT：14 in w.c. 至 10 psig / 35 mbar 至 0.69 bar 之间的两个范围
取压方式
外取压
温度适用范围
丁腈橡胶 (NBR)：-20° 至 180°F / -29° 至 82°C
氟橡胶 (FKM)：0° 至 300°F / -18° 至 149°C
如需其他技术信息
Fisher Type 289P pilot-operated relief valve is used to provide over pressure protection for downstream systems suitable for service on natural gas, air, propane, or any other operating medium not corrosive to the internal parts. Smooth opening action minimizes system pressure surges during emergency action. Very little buildup over set pressure is required to completely open the main valve for max relief capacity. The external control line provides quick, accurate pressure registration.
Features
Economical
High Relief Capacity with Low Buildup
Accurate
Fast Reseat After Operation
Ease of Maintenance
Rugged Construction
Corrosion Resistant Fasteners
Full Usable Capacity
Specifications
Body Sizes and End Connection Styles
1 or 2 NPT
Maximum Relief (Inlet) Pressure
1 NPT: 50 psig / 3.4 bar over relief set pressure or 110 psig / 7.6 bar whichever is lower
2 NPT: 15 psig / 1.0 bar
Relief Set Pressure Range
1 NPT: 10 to 100 psig / 0.69 to 7.0 bar in three ranges
2 NPT: 14-inches w.c. to 10 psig / 35 mbar to 0.69 bar in two ranges
Pressure Registration
External
Temperature Capabilities
With Nitrile (NBR): -20 to 180°F / -29 to 82℃
With Fluorocarbon (FKM): 0 to 300°F / -18 to 149℃
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