289 Series Relief Valve / Backpressure Regulators

 The 289 Series pressure relief valves are throttling relief valves used downstream of pressure regulators to protect the downstream system from overpressure. A smooth throttling action minimizes pressure surges in the system during relief operation. The 289 Series pressure relief valves are ideal for low-pressure settings due to the increased sensitivity provided by a large diaphragm area. These pressure relief valves are available in 3/4, 1 or 2-inch (DN 20, 25 or 50) body sizes.  The 289 Series pressure relief valves are small and compact, making them suitable for areas limited in space.

Features

  • Compact
  • High Flow Rates
  • Reliability Due to Simplicity
  • Tight Shutoff

Body Sizes and End Connection Styles

  • 3/4, 1, or 2-inch (DN 20, 25 or 50) NPT 

Maximum Relief (Inlet) Pressure

  • 100 psig (6,9 bar)

Relief Set Pressure Range

  • 7-inches w.c. to 75 psig (0,02 to 5,2 bar) in several ranges

Pressure Registration

  • Internal

Temperature Capabilites

  • Nitrile: -20 to 180°F (-29 to 82°C)
  • Fluoroelastomers (FKM): 20 to 300°F (-7 to 149°C) / Available with Types 289H and 289HH only

Shipping Weights

  • Type 289H
    1-inch (DN 25) - 4 lb (1,8 kg)
    2-inch (DN 50) - 15 lb (6,8 kg)
  • Type 289HH
    1-inch (DN 25) - 4 lb (1,8 kg)
  • Type 289L
    3/4 or 1-inch (DN 20 or 25) - 1.5 lb (0,68 kg)

    Title Document Type
  289 Relief Valve Bulletins
  289 Relief Valve Instruction_Manuals