Relief Valves or Backpressure Regulators Fisher™ 289 Series
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.
Kategori: Regulator
Brand: Fisher-Emerson
Body Sizes and End Connection StylesTypes 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) Pressure100 psig / 6.9 bar Relief Set Pressure Ranges (5 models)5wc to 50 psig / 25mbar to 3.5 bar Pressure RegistrationInternal Temperature CapabilitiesNitrile (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 WeightsType 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 Ranges0.5 to 2.25 psig / 34 to 155 mbar 289H: Maximum Relief (Inlet) Pressure25 psig / 1.7 bar
