The GRACO 651021 is a 1-inch (25.4 mm) NPT stainless steel (SS) air-operated double diaphragm pump with an aluminum center section, Buna-N (BN) seats, balls, and diaphragms. It is designed for industrial fluid transfer applications, offering robust performance and compatibility with a wide range of fluids.

Key Features:

• Air-operated double diaphragm pump
• Husky 1050, 1 in. (25.4 mm) NPT
• Stainless steel fluid section, aluminum center section, Buna-N (BN) seats, balls, and diaphragms
• Up to 50 gpm (189 lpm)
• Maximum fluid working pressure: 125 psi (8.6 bar, 0.86 MPa)
• Suitable for a wide range of industrial fluids; compatible with various fluid sections (aluminum, polypropylene, conductive polypropylene, PVDF, stainless steel, hastelloy)
• ATEX certified (for certain configurations, including 651021)
• Stall-free air valve for smooth and rapid changeover
• One-piece center section for durability
• Longer diaphragm life (up to 5 times longer than competitors)
• 30% more efficient with 20% more fluid flow than previous models
• Low pulsation, smooth operation
• Easy maintenance and reliability

Applications:
Industrial fluid transfer, including water, antifreeze, fuel, and other compatible liquids. Suitable for mining, agriculture, manufacturing, and other demanding environments.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, safety, and longevity of the pump. Non-genuine parts may compromise reliability and safety.
• Install a fluid pressure relief valve at the pump outlet to prevent overpressurization and rupture of the pump or hose
• Ensure proper alignment and secure mounting
• Use appropriate thread sealant for NPT connections
• Follow GRACO’s recommended maintenance schedule for diaphragms and seals
• Regularly inspect diaphragms, seats, and balls for wear
• Keep air supply clean and dry
• Monitor for leaks and unusual noises
• Replace worn components with genuine GRACO parts