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Pressure Differential Products

Frequent operation start-ups and environmental temperature swings in mechanical equipment can cause the air pressure inside oil sumps to increase and decrease, causing it to “breathe.” This “breathing,” in most cases, brings air in through vents, fills ports, and seals anywhere the oil sump is open to the atmosphere. It can also allow particulates and moisture to enter the equipment attacking and breaking down the lubricant, causing wear, and ultimately reducing the life of bearings and gears.

Closing your lubrication system is the most effective way to prevent harmful contaminants from entering your system. Equalizer® Expansion Chambers are designed to prevent pressure increases in closed systems by supplying the air volume needed to accommodate the air expansion and retraction. This will eliminate or at least reduce the need for equipment to breathe (possibly contaminated) external air. This is especially important when the system is used in harsh or contaminated environments and when frequent start-ups and shut-downs are common in the operation.

Equalizer® Expansion Chambers utilize a rolling diaphragm to provide a variable air expansion volume (up to 25 cubic inches) that maintains oil housing pressure at or near zero PSI (when properly sized). In addition to preventing the exchange of air from the chamber and the surrounding atmosphere, (which can prevent contamination) the reduced pressure will extend seal life and help prevent leakage. Made from corrosion resistant stainless steel, the Equalizer® Expansion Chambers are available in various thread sizes to meet particular needs.

For application assistance on calculating required capacities, please contact our technical services team. You may also use the worksheet in Pressure Differential Products - Specifications, Options, Selection or use the online worksheet.

Contact us to learn more about all the lubrication systems solutions available through U.S. Lubricants.

A “closed system hot setup kit” is available with a 4 oz, 8 oz or 16 oz Closed System Oiler, that includes all necessary fittings and hardware (in 316 stainless steel for maximum corrosion resistance), for quick and easy installation.

Breather Tubes are used to vent Opto-Matic® Oilers and help eliminate vacuums created by abnormally tight bearings or pressures created by high speed bearings. The breather tube helps maintain a constant atmospheric pressure in the bearing housing and is ideal in environments that contain minimal contaminants. Where contamination is a concern, our desiccant breathers can be used to remove contaminants and allow the equipment to breathe.

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