P289 BACKPRESSURE REGULATOR 23 P289 BACKPRESSURE REGULATOR • Throttling Type Relief • High Flow Rates • Compact • Reliability Due to Simplicity • Tight Shutoff The Type P289 Backpressure 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. The design of a 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. APPLICATIONS • Fuel Gas Relief • Gas Gathering Relief SPECIFICATIONS P289-1" P289 2" Port Size 1" NPT 2" NPT Maximum Relief Inlet Pressure 100 PSIG, 6.9 BAR 25 PSIG, 1.7 BAR 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 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 Temperature Range -20–150 ºF with Nitrile and Neoprene 20–300 ºF with Fluoroelastomer -20–150 ºF with Nitrile and Neoprene Elastomers 20–300 ºF with Fluoroelastomer Approximate Weight 2 lbs. 15 lbs. Materials Of Construction Body, Bonnet Aluminum Cast iron body with aluminum bonnet Diaphragm Nitrile or fluoroelastomer Nitrile or fluoroelastomer Gaskets Neoprene Neoprene/Composite O-Rings Nitrile or fluoroelastomer Nitrile or fluoroelastomer O-Ring Piston and spacer Aluminum N/A Seat Washer N/A Stainless Steel Pitot Tube Aluminum Brass or Stainless Steel Main Seat N/A Brass or Stainless Steel Spring Zinc-plated steel Zinc plated steel Diaphragm Piston Zinc-plated steel Zinc-plated steel Closing Cap N/A Zinc P289 2" PART MATRIX PORT SIZE 2" 16 SPRING RANGE W.C or PSIG BAR 7-18" W.C. 0.017-0.045 001 0.5-2.25 PSIG 0.035-0.16 002 1.75-7 PSIG 0.12-0.16 007 4-10 PSIG 0.28-0.7 010 O-RING MATERIAL Nitrile 0 Fluoroelastomer 1 MAIN SEAT MATERIAL Brass 0 Stainless Steel 1 PITOT TUBE MATERIAL Brass 0 Stainless Steel 1 P 2 8 9 1 6 0 0 DIAPHRAGM MATERIAL Nitrile 0 Fluoroelastomer 1 P289 1" PART MATRIX PORT SIZE 1" 08 SPRING RANGE PSIG BAR 1-4.5 0.069-0.3 004 4-15 0.3-1.0 015 10-20 0.69-1.4 020 15-50 1.0-3.4 050 O-RING MATERIAL Nitrile 0 Fluoroelastomer 1 P 2 8 9 0 8 0 0 0 0 DIAPHRAGM MATERIAL Nitrile 0 Fluoroelastomer 1

P289 BACKPRESSURE REGULATOR 25 205.5 8.09 45.5 1.79 104.9 4.13 7.62 0.30 52.6 2.07 P289 1" PARTS P289 1" DIMENSIONS ITEM DESCRIPTION PART NUMBER 1 Adjusting Screw, plated steel 648-487-000 2 Hex Nut, plated steel 634-154-000 3 Spring Guide, plated steel 626-090-000 4 Spring 1–4.5 PSIG (0.1–0.3 BAR), pink Spring 4–15 PSIG (0.3–1 BAR), red Spring 10–20 PSIG (0.7–1.4 BAR), silver Spring 15–50 PSIG (1–3.4 BAR), green 655-688-000 655-689-000 655-676-000 655-690-000 5 Piston Retainer, plated steel 643-191-000 6 Piston, plated steel 637-306-000 7 P289 1" Diaphragm, nitrile P289 1" Diaphragm, fluoroelastomer...

209.04 8.23 182.12 7.17 89.2 3.51 54.1 2.13 26 P289 BACKPRESSURE REGULATOR 26 ITEM DESCRIPTION PART NUMBER 1 Gasket, neoprene 624-066-000 2 Screen, stainless steel 647-020-000 3 Body, cast iron 664-302-000 4 Main Seat, brass Main Seat, stainless steel 650-132-000 650-133-000 5 O-Ring, nitrile O-Ring, fluoroelastomer 649-302-000 649-301-000 6 O-Ring, washer, stainless steel 662-207-000 7 Stem Guide Assembly, cast iron & brass 814-015-000 8 Upper Pipe Plug 639-102-000 9 Diaphragm head, plated steel 637-315-000 10 Lower Spring Retainer, zinc plated steel 643-197-000 11 7 to 18" W.C. range spring,...