DDU Valves

Line mounting adjustable metering units for use with a dual-line system, which discharge a fixed volume of lubricant to half the lubrication points on pressurization of one line and to the remaining points on pressurization of the second line.

PRODUCT CHARACTERISTICS

• up to 350 bar
• Motion indicator with cover
• Metered volume from 0.5 to 3.5 cm3

BENEFITS

• The measuring valve can have from one to four independent operating sections.
• Two normal discharge connections for each operating section reduce the overall cost of the system.
• Any section of the valve can be modified to one discharge, allowing a double sized discharge or an odd number of outlets on the valve.
• Wide stepless adjustment bands for each size of valve allow optimum lubrication delivery to every bearing.
• Positive hydraulic operation with visible indicator of operation.

OPERATION

1. Pressurization of the upper supply line forces the inlet piston down, thereby un-covering both diagonal passages. Lubricant passes through the upper diagonal passage into the main chamber and acts on the top of the main piston, causing it to move.

2. Maintained upper supply line pressure forces the main piston to the lowest limit of its travel, delivering the full measured charge to the bearing. Beyond this point, maintaining upper supply line pressure will have no effect.

3. Pressure is switched to the lower supply line (on a signal from the flow directing valve) which forces the inlet piston up, thereby uncovering both diagonal passages. Lubricant passes through the lower diagonal into the main chamber and acts on the bottom of the main piston, causing it to move upward.

4. Maintained lower supply line pressure forces the main piston to the uppermost limit of its travel, delivering the full measured charge to the bearing. Beyond this point, maintaining lower supply line pressure will have no effect.

Technical Data