The GRACO 557428 is a replacement rupture disk designed for use in high-pressure lubrication systems. It is typically constructed from metal and functions as a safety device that ruptures at a set pressure to protect equipment from overpressure. Its intended use is within GRACO lubrication systems, specifically as a rupture-to-atmosphere indicator for divider valves.

Key Features:

• Rupture Disk
• 3/8 in (0.375 in, 10 mm diameter)
• Maximum working pressure: 7300 psi (503 bar, 50.3 MPa)
• For use with MJ, MSP, MHH, and MXP Divider Valves
• Color-coded (Blue) for easy identification
• Single-piece design for reliability
• Used as a safety device to prevent equipment damage from overpressure
• Easy to replace

Applications:
Used in GRACO lubrication systems as a rupture-to-atmosphere indicator for divider valves, particularly in applications where system pressures exceed 2,500 psi. Commonly found in industrial, mining, and agricultural equipment requiring reliable overpressure protection.

Installation Notes:

• Using genuine GRACO replacement parts ensures proper fit, function, and safety within the lubrication system.
• Ensure system is depressurized before installation
• Verify correct part number and pressure rating before installation
• Follow manufacturer’s recommended installation procedures
• Regularly inspect rupture disks for signs of wear or damage and replace as needed