Fisher™ 289L-289H系列安全阀是一款弹簧负载式节流泄压阀，可用作下游压力调压器，防止系统出现过压。 平稳的节流操作在泄压操作期间可大限度地降低系统中的压力冲击。289 系列泄压阀是低压设置的理想选择，因为大阀膜面积可获得更高的灵敏度。289 系列泄压阀设计用于压力控制；它们不适合用作 ASME 安全泄压阀。广州奥丽斯特燃气设备有限公司是美国FISHER产品华南区域（广东省）艾默生集团*代理商。Fisher™ 289L-289H系列安全阀

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

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 Registration

Internal

Temperature Capabilities

Nitrile (NBR) and Neoprene (CR) Elastomers: -20 to 150°F / -29 to 66°C Fluorocarbon (FKM): 20 to 300°F / -7 to 149°C Available with Types 289H and 289HH only

Approximate Weights

Type 289A and 289U: 0.75 Pounds / 0.3 kg
Type 289H: 1 NPT - 4 Pounds / 2 kg, 2 NPT - 15 Pounds / 7 kg
Type 289HH: 4 Pounds / 2 kg
Type 289L: 15 Pounds / 7 kg

289H: Relief Adjustment Ranges

0.5 to 2.25 psig / 34 to 155 mbar

289H: Maximum Relief (Inlet) Pressure

25 psig / 1.7 bar

Fisher China Guangzhou Honest Gas Equipment Co., LTD.