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.)

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