The GRACO 557438 is a replacement rupture disk designed for use in lubrication systems. It is a safety component that ruptures at a set pressure to protect equipment from overpressure. The disk is typically made from a metal or composite material (exact material not specified), and is intended for use as a rupture-to-atmosphere indicator in conjunction with system pressure switches, providing early warning of faults while allowing the lube system to continue delivering to critical bearings.

Key Features:

• Rupture Disk
• 11/16 in (0.688 in, 17 mm) diameter
• 2950 psi (203 bar, 20.3 MPa, 20326 kPa)
• For use with MJ, MSP, MHH, and MXP Divider Valves
• Blue performance indicator for easy identification
• Provides early warning of blocked lines, high system pressure, or blocked bearings
• Allows lube system to continue delivering to critical bearings during fault conditions
• Requires replacement after rupture to restart the lube system

Applications:
Used in industrial lubrication systems as a safety and diagnostic component, particularly in applications requiring reliable pressure relief and fault indication for critical bearings and lines.

Installation Notes:

• Using genuine GRACO parts ensures proper fit, function, and safety in lubrication systems, maintaining system reliability and preventing equipment damage.
• Replace the rupture disk after any rupture event to restore system operation
• Ensure correct orientation and secure fit during installation
• Regularly inspect for signs of wear or damage and replace as needed
• Consult the equipment manual for specific installation procedures