The GRACO DB3977 is an air-operated double diaphragm pump designed for industrial fluid transfer. It features an aluminum center section, polypropylene seats, Buna-N balls, and a Buna-N diaphragm, making it suitable for handling a wide range of chemicals and fluids in demanding environments.

Key Features:

• Air-Operated Double Diaphragm Pump
• Husky 1590, 1-1/2" NPT
• Aluminum center section, polypropylene seats, Buna-N balls, Buna-N diaphragm
• Maximum free flow delivery: 100 gpm (378.5 lpm)
• Maximum fluid working pressure: 120 psi (8.4 bar, 0.84 MPa)
• Industrial fluids, chemicals, water, wastewater, and compatible with a wide range of process liquids
• Patented, high-reliability closed center air valve
• Online serviceable for easy maintenance
• Epoxy-coated air section for tough environmental conditions
• Robust construction for reliability and long service life
• Suitable for handling solids up to 0.19 in (4.8 mm)

Applications:
Industrial fluid transfer, chemical processing, water and wastewater transfer, compatible with asphalt sealer, antifreeze, detergents, motor oil, hydraulic fluid, cutting oil, and more

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, reliability, and compatibility with existing equipment.
• Ensure proper alignment and secure mounting of the pump
• Use appropriate thread sealant for NPT connections
• Check for leaks after installation
• Follow manufacturer’s guidelines for air supply and fluid compatibility
• Regularly inspect and maintain diaphragms and seals for longevity