The GRACO 115121 Vent Valve is a robust component designed for venting pressurized lubricant in single-line parallel automatic lubrication systems. It features a 1/8 in. NPT male connection and is constructed with fluid-side wetted parts made of carbon steel and Viton® (fluoroelastomer), and air-side wetted parts of aluminum and Buna-N. Its primary function is to enable injector reset for the next lubrication cycle by venting pressurized lubricant, ensuring reliable system operation.

Key Features:

• Standard Vent Valve
• 1/8 in. NPT Male
• Fluid-side: Carbon Steel, Viton® (fluoroelastomer); Air-side: Aluminum, Buna-N
• Maximum air pressure: 120 psi (0.8 MPa, 8 bar); Maximum fluid pressure: 3800–4000 psi (26–28 MPa, 262–276 bar)
• Air-powered single-line parallel automatic lubrication systems; Recommended fluids: Grease NLGI grade #1 or lighter (some sources say #2 or lighter)
• GRACO Inc. is registered to I.S. EN ISO 9001
• Reliable venting for injector reset
• Robust construction for high-pressure environments
• Easy to maintain and replace
• Compact dimensions: 4.25 in. H x 2.25 in. W (108 mm H x 57 mm W)

Applications:
Used in industrial and mobile lubrication systems for venting pressurized lubricant to reset injectors, ensuring proper lubrication cycles in machinery and equipment.

Installation Notes:

• Using genuine GRACO parts ensures compatibility, reliability, and optimal performance of the lubrication system.
• Ensure system is depressurized before installation or maintenance
• Use appropriate thread sealant for NPT connections
• Follow manufacturer’s recommended torque specifications
• Regularly inspect for leaks and wear
• Replace seals and wetted parts as needed for continued reliability