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It's Smooth Throttling Action
Minimizes Pressure Surges

Fisher 289 Series Relief Valves or Backpressure Regulators

Fisher 289 Series Relief Valves or Backpressure Regulators

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.

Documents & Drawings

Features

  • Throttling Type Relief
  • High Flow Rates
  • Small Size
  • Reliability Due to Simplicity
  • Compact Design

Click to get more information on the Fisher 289 Series Relief Valves or Backpressure Regulators

SPECIFICATIONS

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

Click to get more information on the Fisher 289 Series Relief Valves or Backpressure Regulators

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