The Lincoln Ventmeter provides a standardized method for assessing the ventability of grease—a measure of how easily grease can be expelled or vented through a supply line under pressure.
The test involves pressurizing a 25-foot coiled steel tube filled with the test grease to 1800 psi using a manual grease gun. After pressure stabilization, the venting valve is opened, and the pressure drop after 30 seconds is recorded. This value, referenced against standardized charts, indicates the maximum permissible line length and pipe diameter suitable for that grease type.
The ventmeter assembly simulates a centralized lubrication system with:
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Two control valves — Valve 1 near the pressure gauge and Valve 2 at the grease gun connection.
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A 25-foot coiled tubing to replicate line length resistance.
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A high-precision pressure gauge calibrated up to 1800 psi.
Testing can be conducted at different temperatures (typically 0°F, 30°F, and 75°F) to simulate field conditions. When testing at non-ambient temperatures, the ventmeter filled with grease must be conditioned in a temperature chamber for 4 hours before measurement.
Repeating the test three times and averaging the results provides consistent data to determine the ventability index and system design suitability of the grease.
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Conforms to standard ventability testing procedures for centralized lubrication systems
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Determines grease suitability based on venting pressure and consistency
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Simulates real-world supply line resistance (25 ft coiled tube)
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Enables determination of maximum supply line length and diameter
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Supports testing at different temperature conditions (0°F, 30°F, 75°F, or as required)
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Compact, durable design—ideal for laboratory and field testing
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No electrical requirements—manual operation ensures portability and reliability
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Essential for system design validation, grease development, and lubrication performance studies
