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BelGAS 289 Series - L289 Relief Valve/Back Pressure Regulator

P289
P289

The L289 Back Pressure Regulator functions as a high flow relief valve with an adjustable set point. The L289 can be used in place of a standard relief valve to provide protection against over pressurization in the downstream system. The design of the large diaphragm area and a pitot tube booster allow the valve to respond quickly and relieve the excessive pressure smoothly, especially in low-pressure settings.

Features:
  • Aluminum Construction
  • Multiple Inlet Sizes
  • Throttling Type Relief
  • High Flow Rates
  • Compact
  • Reliability Due to Simplicity
  • Tight Shutoff
Applications:
  • Low Pressure Applications
  • Fuel Gas Relief
  • Gas Gathering Relief
Model
L289
Series
Type 289 Series
Body Sizes
3/4" x 2" NPT
1" x 2" NPT
2" x 2" NPT
Spring Range
W.C. or PSIG / mBAR
5 - 10" W.C. / 12.45 - 24.90
7 - 18" W.C. / 17.43 - 44.83
12 - 40" W.C. / 29.89 - 99.63
0.5 - 2.25 PSIG / 34.47 - 155.03
1.75 - 7 PSIG / 120.65 - 482.63
4 - 10 PSIG / 275.79 - 689.47
Seat Material
Brass or Stainless Steel
Application(s)
Pressure Protection, Commercial, Industrial
Pilot Operated
No
Connection
NPT
Diaphragm Material
Nitrile or Fluoroelastomer
Product Description
L289 Back Pressure Regulators
Temperature Range(s)
-20–150ºF with Nitrile and Neoprene Elastomers
0–300ºF with Fluoroelastomer
Max Inlet Body Pressure
25 PSIG 1.7 BAR
Body, Bonnet, Diaphragm Material
L289 - Aluminum Body with Aluminum Bonnet
Diaphragm: Nitrile or Fluoroelastomer
Gaskets: Neoprene/Composite
O-rings: Nitrile or Fluoroelastomer
Seat Washer: Stainless Steel
Pitot Tube: Brass or Stainless Steel
Main Seat: Brass or Stainless Steel
Spring: Zinc-Plated Steel
Diaphragm Piston: Zinc-Plated Steel
Closing Cap: Acetal
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