The GRACO 25T478 is a medium pressure fluid back pressure regulator constructed from stainless steel (SST), designed to control upstream fluid pressure in industrial fluid circulation systems. It is intended for use within GRACO equipment to maintain consistent system pressure and protect sensitive components from pressure fluctuations.

Key Features:

• Medium Pressure Fluid Back Pressure Regulator
• 25T478
• Stainless Steel (SST)
• 5 gpm (gallons per minute) Max
• 1000 psi Max
• Designed for integration with GRACO fluid circulation systems and compatible with various industrial finishing and coating applications
• Pneumatic operation for precise pressure control
• Stainless steel construction for durability and corrosion resistance
• Supports high flow and pressure applications
• Reliable performance in demanding industrial environments
• Ease of maintenance with accessible components

Applications:
Used in industrial finishing, paint circulation, and coating systems where maintaining consistent upstream pressure is critical for process quality and equipment protection.

Installation Notes:

• Using genuine GRACO parts ensures compatibility, reliability, and optimal performance of the fluid circulation system.
• Mount the regulator securely in the fluid return line after the last spray station to maintain proper system pressures
• Connect fluid lines to the appropriate inlet and outlet ports as marked on the regulator housing
• Install an accessory gauge in the 1/4 inch gauge port if required
• Plug unused ports to prevent leaks
• Apply NLGI Grade 2 grease to moving parts and metal assembly paste to threads for optimal performance and longevity
• Torque fasteners to manufacturer specifications (e.g., 175–200 in-lbs or 20–23 N•m for similar models)
• Handle carbide piston and seat components with care to avoid damage and leakage
• Regularly inspect for leaks, wear, or damage
• Clean and lubricate moving parts as recommended
• Replace worn or damaged components promptly
• Store in a dry, well-ventilated area to prevent corrosion