Air Lubricator

Single-point lubricators are designed to give a consistent, measured and continuous supply of fresh grease or lubricating oil. When compared with manual lubrication or other traditional lubrication methods, single-point lubricators offer a few cost-saving and efficiency-gaining advantages, including the following:

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Electromechanical lubricators usually have a reusable drive motor which allows you to only replace the lubricant cartridge and batteries after each use. Make sure the dual in-line package (DIP) switch setting for volume/cartridge size coincides with the cartridge you’re installing. DIP switch settings generally are located on the cartridge label and in the installation instructions.

Single-point lubricator designs have been improved since the traditional grease cup arrived on the scene more than 30 years ago. Modern designs come with features like varying reservoir capacity, multiple pressure and temperature limitations, and multiple discharge rates from weeks, months and even up to a year or more. Let’s take a look at five single-point lubricator designs you should consider.

When considering which type of single-point lubricator to purchase, it’s important to understand what influences the flow of grease. High ambient temperatures soften grease, making it more fluid and increasing discharge pressure within the lubricators (up to four times). Low line restriction can also increase grease flow.

The prices of single-point lubricators can run the gamut and will depend on multiple factors. Keep in mind that mounting kits and other accessories are sold separately. Among the factors that will affect the price include:

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Prices may be as low as $32 to $64 for a single-use grease cup and as high as $800 for electromechanical lubricators filled with specialty grease (synthetic, anti-wear, organo-clay, extreme temperature, etc.). While these prices represent the low and high end of the spectrum, the majority of lubricators hover around the $100 to $300 price range.

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This gas presses the bladder against the piston, at which point the piston pushes the lubricant into the bearing or component. Once the lubricant has been used, the lubricator is discarded and a new one is installed. The flow of the lubricant discharge can be controlled using electronic controls that adjust gas production and the rate at which grease is displaced. The flow rate for piston-activated lubricators usually is around 0.1 to 0.7 cc per day. Discharge rates are affected by variations in ambient temperature. A rise in temperature increases the discharge rate, and temperature drops decrease the discharge rate.

This type of single-point lubricator is available in capacities ranging from around 60 cc to well over 600 cc (2 to over 20 ounces). The lubricator can be set to distribute a set amount of grease at a specific interval or to dispense the full volume of grease over a defined period of time. These also commonly have feedback lights that will flash for normal operations and also alert inspectors to abnormal conditions or lubricator failure. They are capable of producing higher pressure and are less susceptible to fluctuations of discharge rates due to changes in ambient temperatures.

Lubricator Pump

When operating in impulse mode, this type of lubricator dispenses a pre-defined quantity as soon as electricity is applied. You can choose the desired amount of lubrication via the LCD. The time mode allows the lubricator to dispense lubrication in predetermined times and operating hours. For example, the Star Control lubricator has a reusable drive, so when all the lubricant within the cartridge is discharged, you simply order a new cartridge and reuse the drive unit.

Lubricator symbol

According to single-point lubricator manufacturers, for electric-motor bearings ranging from 25 to 400 horsepower at an ambient temperature of 77 degrees F (25 degrees C), a unit would discharge approximately 0.166 cc per day and remain in service for 24 months. A higher ambient temperature, such as 113 degrees F (45 degrees C), would change the discharge rate to 0.66 cc per day (an increase by a factor of four) and shorten the lubricator’s service life to nearly six months. A gas leak will impact these lubricators and render them useless. The grease level should be routinely monitored to ensure that it is still pushing grease.

Single-point lubricators are designed to be installed easily into bearing unit adapters. Once you’ve selected the correct bearing unit adapter, the male end of the single-point lubricator threads into the female end of the adapter. Once secure, you can set the desired grease flow according to the instructions for the specific lubricator. Typically, you’ll see discharge periods from one to 24 months.

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Due to the use of a chemical reaction to form gas, electrochemical lubricators are sensitive to extreme temperatures; this means the amount of gas formed decreases in low temperatures and increases in high temperatures. Electrochemical single-point lubricators are typically safe to use in hazardous locations depending on the gas that is being produced by the reaction.

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Vibration-activated lubricators still allow for predetermined lubrication schedules (anywhere from 15 days to 24 months), but they only dispense grease or oil when the machine is operational. When the machine is idle, the vibration sensor detects this, automatically switching the unit to pause mode and temporarily stopping the lubrication cycle. These units have three sensitivity levels: low sensitivity for applications with high vibrations, medium sensitivity for most standard machinery, and high sensitivity for low levels of vibration.

This type of single-point lubricator is available in capacities ranging from around 60 to 500 cc (2 to 16 ounces). Depending on which selector switch you choose, you can control the rate of gas being generated. The dispenser is then adjusted to deliver lubricant at a predetermined rate against atmospheric pressure. Adding back pressure reduces the discharge rate. Some manufacturers produce units capable of achieving discharge pressure of up to 100 psi.

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Precise-metering lubricators are best for electric motors with specific relubrication amount requirements and applications like chains, gear racks, open gears, roller and sliding bearings, and spindles.

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There are two main types of modern single-point lubricators: electrochemical and electromechanical. Examples of both have been discussed above, but it’s important to know the difference in general terms so you can understand the mechanics of how each type works

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Conversely, low ambient temperatures stiffen grease, making it less fluid and decreasing discharge pressure. High line restriction like narrow ID lines, gas chamber leakage (gas-type lubricators) and line blockages also contribute to a decrease in grease flow.

Determining which single-point lubricator is right for your environment is key. Now that you know what affects grease flow, you can more easily determine the appropriate lubricator. For example, spring-loaded lubricators are often made of polycarbonate (up to 250 degrees F) or borosilicate (up to 450 degrees F) for protection against high temperatures. Gas-activated lubricators have a low-pressure displacement, which may not be good for environments that decrease grease flow. Positive displacement lubricators control grease flow without resistance and can have discharge pressures nearing 900 psi. They also are not sensitive to temperature or vibration, making them a popular choice.

Around 60 to 80 percent of bearing failures can be traced back to a lubrication issue, whether it’s poor lubricant selection and application, lubricant contamination or lubricant degradation. A single-point lubricator is a device engineered to regularly and automatically deliver a small amount of clean grease or lubricating oil to a specific area. It most often is used to keep bearings lubricated but can also be utilized to lubricate pumps, electric motors, fans, chains and conveyors, among other applications. Manually greasing bearings often results in over- and under-greasing, which eventually leads to premature bearing wear. Single-point lubricators can be configured to dispense the correct lubricant quantity to a single point for a predetermined time period. Single-point lubricators are a popular method of extending the life of bearings and other components as well as preventing extended downtime due to lubrication-related failures. Below, we’ll discuss the various types of single-point lubricators, how they work and how to install them.