Single-Line Lubrication System

Single-line Lubrication Systems

"The single-line centralized lubrication system is suitable for machines where many lubrication points are located in a long line. It is mainly used for dispensing grease and is widely operated today in various industrial sectors. Basically, a single-line system consists of a lubrication pump, a vent valve, a number of injectors and a main delivery line. The lubricant discharged from the pump is forced to flow under pressure through the vent valve and the single main delivery line to the injectors and then supplied to the lubrication points connected to the injectors. It is easy to add or reduce injectors after installation of the lubrication system so the single-line systems provide good flexibility against the changes in the quantity of the lubrication points of equipment. The amount of lubricant output per injector is finely adjustable thus the single-line injectors supply precisely metered volume to the lubrication points There are two types of vent valves, motor driven and electromagnetic. A pressure switch must be installed at the end of the line or at the outlet side of the pump in order to activate the vent valve. In the single-line systems, the stop of the pump is controlled by means of pressure not time. In other words, after the pump starts the pressurized lubricant is supplied to each injector through the main delivery line, injectors are operated to discharge lubricant to the lubrication points and the pressure in the main delivery line rises gradually. After the operations of all the injectors are completed the pressure in the line builds up to the set pressure. The pressure switch senses this high pressure and activates the lubricationpump to stop and the vent valve to release the build-up pressure back to the reservoir. It is easy to detect leaks or blockages in the pipes due to the pressure-controlled method. "