The meter units have a check valve in them. The check valve opens when the line pressure increases. As the line pressure decreases, the check valve closes back up. This allows the lines in the cyclic systems to remain filled when the cyclic pumps are not putting out a pressure. Because the continuous systems are always delivering lubricant through the system, they do not require the check valves. That is why control units are used with the continuous system. (Note: one exeception to this rule is when the customer needs the amount of lubricant that a continuous type pump puts out but wants to control how often the pump runs through means of an outside controller. This can be done and will function properly but the system must then be supplied with meter units instead of control units for the lubrication points.)

Posted in: Central Lubrication

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