The GRACO 557425 is a replacement rupture disk designed for use in high-pressure lubrication systems. It is typically constructed from durable materials suitable for industrial environments and is intended to act as a safety device, rupturing at a specified pressure to protect equipment from overpressure conditions. This part is used within GRACO equipment to indicate and relieve excessive pressure, especially in applications where lube system pressures exceed 2,500 psi.

Key Features:

• Rupture Disk
• 3/8 in
• Maximum working pressure: 5500 psi (37.9 MPa, 379 bar)
• Designed for use with GRACO lubrication systems and compatible with specific GRACO performance indicators and divider valves
• Acts as a safety device to protect equipment from overpressure
• Easy to replace, allowing quick system restart after a fault
• Color-coded (orange) for easy identification of pressure rating
• Reliable performance in high-pressure industrial environments

Applications:
Used in industrial lubrication systems, particularly where system pressures exceed 2,500 psi. Commonly installed in MH divider valve applications and other GRACO equipment to provide overpressure protection and fault indication.

Installation Notes:

• Using genuine GRACO replacement parts ensures proper fit, function, and safety within the lubrication system. Non-genuine parts may not meet required specifications and could compromise system integrity.
• Always replace the rupture disk after it has ruptured to restore system operation
• Ensure the system is depressurized before installation
• Use appropriate tools and follow GRACO installation guidelines
• Check for correct orientation and secure fitment
• Regularly inspect rupture disks for signs of wear or damage
• Replace disks as part of routine maintenance or after any overpressure event
• Keep spare disks on hand for quick replacement