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.

Specifications

Body Size and End Connection Styles	Types 289A and 289U: 1/4 NPT Type 289H: 1, 2 NPT Type 289HH: 1 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 289H: 1 NPT – 4 Pounds / 2 kg, 2 NPT – 15 Pounds / 7 kg Type 289HH: 4 Pounds / 2 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

Hours Of Operation

Sunday To Thursday
9:00 AM to 6:30 PM

Office Location

Building # 125 (2nd Floor), Road # 05, New DOHS, Mohakhali, Dhaka – 1206, Bangladesh