The GRACO 650557 is an air-operated double diaphragm pump featuring a PVDF (polyvinylidene fluoride) end flange, aluminum center section, PVDF seats, PTFE balls, and PO (polyolefin) diaphragm. It is designed for reliable, low-pulsation transfer of fluids, including those with small solids, in industrial and maintenance applications.

Key Features:

• Air-operated double diaphragm pump
• Husky 1050
• PVDF end flange, aluminum center section, PVDF seats, PTFE balls, PO diaphragm
• Maximum flow rate: 42 GPM (varies by configuration; some sources list up to 50 GPM for standard Husky 1050 models)
• Maximum fluid working pressure: 100–125 psi (7–8.6 bar, 0.7–0.86 MPa) depending on configuration
• Compatible with a wide range of fluids, including those with solids up to 1/8 inch (3.2 mm) in size
• UL listed
• Stall-free, low-pulsation air valve for smooth and rapid changeover
• Bolted design for even sealing and easy maintenance
• Reliable operation with minimal maintenance required
• Handles abrasive and corrosive fluids

Applications:
Ideal for transferring fluids in industrial, mining, agricultural, and maintenance environments, especially where resistance to corrosion and abrasion is required.

Installation Notes:

• Using genuine GRACO parts ensures optimal performance, safety, and longevity of the pump.
• Ensure proper alignment of all components during assembly
• Use recommended torque settings for bolted connections
• Check for leaks and proper air supply before operation
• Regularly inspect diaphragms, balls, and seats for wear and replace as needed