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Downloadable Files: |
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P289 Backpressure Regulator
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- Throttling Type Relief
- High Flow Rates
- Compact
- Reliability Due to Simplicity
- Tight Shutoff
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Product Detail: |
The Marsh Bellofram BelGAS P289 back pressure regulator functions as a high flow relief valve with an adjustable set point. The P289 can be used in place of a standard relief valve to provide protection against over pressurization in the downstream system. With its large diaphragm area and integral Pitot tube booster, the P289 is designed for quick and smooth response to excessive pressure relief requirements, particularly within low-pressure settings. Optional regulator rebuild kits are also available.
Applications
• Fuel Gas Relief
• Gas Gathering Relief
• Downstream System Pressure Control
• Low-pressure relief
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Part Numbers: |
P289 1"
Create Part Number: |
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P289 |
08 |
XXX |
0 |
0 |
0 |
X |
X |
0 |
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08 |
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1" |
Port Size |
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004 |
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1-4.5 PSIG |
0.069-0.3 BAR |
Spring Range |
015 |
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4-15 PSIG |
0.3-1.0 BAR |
020 |
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10-20 PSIG |
0.69-1.4 BAR |
050 |
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15-50 PSIG |
1.0-3.4 BAR |
075 |
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45-75 PSIG |
3.5-5.2 BAR |
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0 |
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Nitrile |
O-Ring Material |
1 |
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Fluoroelastomer |
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0 |
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Nitrile |
Diaphragm Material |
1 |
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Fluoroelastomer |
P289 2"
Create Part Number: |
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P289 |
16 |
XXX |
0 |
0 |
X |
X |
X |
X |
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16 |
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2" |
Port Size |
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001 |
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7-18" W.C. |
0.017-0.045 BAR |
Spring Range |
002 |
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0.5-2.25 PSIG |
0.035-0.16 BAR |
007 |
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1.75-7 PSIG |
0.12-0.48 BAR |
010 |
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4-10 PSIG |
0.28-0.7 BAR |
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0 |
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Brass |
Main Seat Material |
1 |
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Stainless Steel |
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0 |
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Nitrile |
O-Ring Material |
| 1 |
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Fluoroelastomer |
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0 |
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Nitrile |
Diaphragm Material |
| 1 |
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Fluoroelastomer |
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0 |
Brass |
Pitot Tube Material |
| 1 |
Stainless Steel |
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Options: |
Regulator Rebuild Kits
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Part Number |
P289 1" |
Nitrile diaphragms, Screen & Gasket |
971-289-000 |
Fluorocarbon diaphragm, Screen & Gasket |
971-289-001 |
P289 2" |
Nitrile diaphragms, Screen, Screen Gasket (Neoprene), Composite Gaskets (Qty. 3) |
971-289-002 |
Fluorocarbon diaphragm, Screen, Screen Gasket (Neoprene), Composite Gaskets (Qty. 3) |
971-289-003 |
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Purchase Details: |
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Product Contact: |
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Specifications: |
P289 1" Specifications |
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Port Size |
1 NPT |
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Maximum Relief Inlet Pressure |
100 PSIG, 6.9 BAR |
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Relief Set Pressure Ranges |
1-4.5 PSIG, .07-0.3 BAR
4-15 PSIG, .28-1.0 BAR
10-20 PSIG, 0.7-1.4 BAR
15-50 PSIG, 1-3.5 BAR
45-75 PSIG, 3.1-5.2 BAR
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Temperature Range |
-20–150 ºF with Nitrile and Neoprene
0–300 ºF with Fluoroelastomer |
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Approximate Weight |
2 lbs. (0.907 kg) |
P289 1" Materials of Construction |
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Body, Bonnet |
Aluminum |
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Diaphragm |
Nitrile or Fluoroelastomer |
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Gaskets |
Neoprene |
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O-Rings |
Nitrile or Fluoroelastomer
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O-Ring Piston and Spacer |
Aluminum |
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Seat Washer |
N/A |
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Pitot Tube |
Aluminum |
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Main Seat |
N/A |
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Spring |
Zinc-plated steel |
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Diaphragm Piston |
Zinc-plated steel |
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Closing Cap |
N/A |
P289 2" Specifications |
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Port Size |
2 NPT |
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Maximum Relief Inlet Pressure |
25 PSIG, 1.7 BAR |
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Relief Set Pressure Ranges |
7-18" W.C,
0.017–0.045 BAR
0.5-2.25 PSIG,
0.035–0.16 BAR
1.75-7 PSIG, 0.12–0.5 BAR
4-10 PSIG, 0.28–0.7 BAR |
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Temperature Range |
-20–150 ºF with Nitrile and Neoprene Elastomers
0–300 ºF with Fluoroelastomer |
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Approximate Weight |
15 lbs. (6.803 kg) |
P289 2 " Materials of Construction |
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Body, Bonnet |
Cast iron body with aluminum bonnet |
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Diaphragm |
Nitrile or Fluoroelastomer |
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Gaskets |
Neoprene / Composite |
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O-Rings |
Nitrile or Fluoroelastomer |
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O-Ring Piston and Spacer |
N/A |
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Seat Washer |
Stainless Steel |
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Pitot Tube |
Brass or Stainless Steel |
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Main Seat |
Brass or Stainless Steel |
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Spring |
Zinc-plated steel |
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Diaphragm Piston |
Zinc-plated steel |
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Closing Cap |
Zinc |
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P289 Catalog Pages (1.1 MB)
