FAQ: Central Lubrication

Air and liquid line connections on the Mark 1 pump are 3/8", the control valves take 1/4" tubing. How do you connect the control valves to the pump?

Our part number 30098 is a shut-off valve that has a 3/8" compression fitting on one end and a 1/4" compression fitting on the other end and could be used in this application if the customer desires a shut-off valve in the system. Customer can also use a 10616 tee fitting in conjunction with two of the 10563R 3/8" tube compression fittings and one of the 10569R would be connected to the control valve and sections with the 10569R would be used between the pump and the rest of the series of control valves.

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What is the difference between the meter units and the control units used with the central lubrication pumps?

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.)

Can manual or automatic pumps other than the PE-34 or PE-44 series be used with the positive displacement injectors?

No. The positive placement injectors require the use of the PE-34 or PE-44 series pump.

How can you verify that the lubricant is being delivered to the lubrication points in a central lubrication system?

There are two ways to do this. The first way is to use a pressure gauge mounted at the end of the distribution system. By noting the pressure that the system maintains, a rise in pressure would indicate that one or more of the delivery lines are blocked, either the line itself or the control or meter unit. A decrease in pressure would indicate that there is a leak in the the delivery line at some point. The second way to verify delivery of the lubricant would be to install a sight valve, such as our ST series, into the delivery line between the control or meter unit and the lubrication point. This would allow visual indication of the lubricant being delivered to the lubrication point.