The GRACO 651809 is a stainless steel air-operated double diaphragm pump from the Husky 1050 series, designed for reliable transfer of fluids in industrial and maintenance applications. It features a stainless steel body, PTFE (Teflon) balls, and a PTFE/Stainless Steel diaphragm, making it suitable for handling a wide range of chemicals and fuels.

Key Features:

• Air-operated double diaphragm pump
• Husky 1050S-E, 1" (25.4 mm) BSPT
• Stainless steel body, PTFE balls, PTFE/Stainless Steel diaphragm, aluminum center section
• Maximum free flow delivery: 50 gpm (189 lpm) (varies by configuration; some models list up to 38 gpm for specific applications)[1][5]
• Maximum fluid working pressure: 125 psi (8.6 bar, 0.86 MPa) for metal models; some configurations list 100 psi (7 bar, 0.7 MPa) or 50 psi (0.35 MPa) depending on application[1][3][5]
• Compatible with a wide range of fluids, including fuels and chemicals; suitable for industrial, mining, and agricultural applications
• UL listed (for some configurations)[3][4]
• Stall-free low pulsation air valve for smooth and rapid changeover
• Reliable and robust construction for heavy-duty use
• Easy maintenance and serviceability
• Handles solids up to 1/8" (3.2 mm) in size
• Maximum pump speed: 280 cycles per minute
• Maximum suction lift: 16 ft (4.9 m) dry, 29 ft (8.8 m) wet

Applications:
Ideal for transferring fuels, chemicals, and other industrial fluids in environments requiring robust, corrosion-resistant equipment. Commonly used in mining, agriculture, and general industrial maintenance.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, safety, and longevity of the pump. Non-genuine parts may compromise reliability and void warranties.
• Ensure proper alignment and secure mounting of the pump
• Use appropriate fittings and hoses rated for the intended fluid and pressure
• Check for leaks and proper air supply before operation
• Follow manufacturer’s guidelines for maintenance intervals and diaphragm inspection