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289 RELIEF VALVE

Rp. 01
Last Updated
22 Sep 2021
Minimum Order
1 1
Category
FISHER

Specification of 289 RELIEF VALVE

Relief Valve


Fisher™ 289 Series Relief Valves or 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.


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


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