289 Series Relief Valves / Backpressure Regulators
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.
CAD Drawings and Models: Click Here
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- Throttling Type Relief
- High Flow Rates
- Small Size
- Reliability Due to Simplicity
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
100 psig / 6.9 bar
Type 289A - Zinc:
3 to 13 psig / 0.21 to 0.90 bar
11 to 22 psig / 0.76 to 1.5 bar
Type 289H - Cast iron:
7 to 18-inches w.c. / 17 to 45 mbar
0.5 to 2.25 psig / 0.03 to 0.15 bar
1.75 to 7 psig / 0.12 to 0.48 bar
4 to 10 psig / 0.28 to 0.69 bar
Type 289H - Aluminum:
1 to 4.5 psig / 0.07 to 0.31 bar
4 to 15 psig / 0.28 to 1.0 bar
10 to 20 psig / 0.69 to 1.4 bar
15 to 50 psig / 1.0 to 3.5 bar
Type 289HH - Aluminum:
45 to 75 psi / 3.1 to 5.2 bar
Type 289L - Aluminum:
12 to 40-inches w.c. / 30 to 99 mbar
10 to 18-inches w.c. / 25 to 45 mbar
Type 289U - Zinc:
5 to 25-inches w.c. / 12 to 62 mbar
20-inches w.c. to 3 psig / 50 to 207 mbar
Internal
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
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
For additional technical information, contact your local Sales Office or refer to technical documentation.
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