DD Valves are completely hydraulic in operation and will deliver either oil or grease. These Dualine valves are also fully and individually adjustable in regard to discharge quantity and are equipped with operational indicators. Each DD valve serves two bearings; however, by a simple method of cross-porting, it will serve one. Therefore, a four valve block, as an example, can actually serve anywhere between four and eight bearings. DD valves can be supplied in several basic discharge capacities and are available in blocks consisting of one, two, three or four valves.
Operation
Pressurized lubricant entering the valve forces the pilot piston down, allowing pressure to be applied to top of the main piston. The main piston begins to move down under pressure, forcing lubricant from its chamber, past the lower land of the pilot piston and out the discharge line to the bearing. When pressure in the supply line is reversed, lubricant then enters valve and forces the pilot piston up, allowing pressure to be applied to bottom of main piston, which begins to move up, forcing lubricant from its chamber, past the upper land of the pilot piston and out the second discharge line to the bearing.
Features
VALVE OUTPUT
Model | Discharge per piston stroke | Discharge change per adj. screw revolution | Total adj. range | |
Minimum | Maximum | |||
DD-2X | 0.09cc (0.006 cu. in.) | 0.59cc (0.036 cu. in.) | 0.03cc (0.002 cu. in.) | 0.45” (11mm) |
DD-5X | 0.18cc (0.011 cu. in.) | 4.74cc (0.289 cu. in.) | 0.18cc (0.011 cu. in.) | 1.21” (30mm) |
HOW TO ORDER
Name | Lube Point (#) | Basic valve without connectors | Basic valve with U-81-XX connectors | Basic valve without indicator stem | Basic valve without indicator stem & connectors | Basic valve w/o indicator tower for harsh environments |
DD VALVE | 2 | DD22250 | DD22250T* | DD22251 | DD22251T | --- |
4 | DD24250 | DD24250T* | DD24251 | DD24251T | --- | |
6 | DD26250 | DD26250T* | DD26251 | DD26251T | --- | |
8 | DD28250 | DD28250T* | DD28251 | DD28251T | --- | |
2 | DD52250 | DD52250T** | DD52251 | --- | DD52250206**** | |
4 | DD54250 | DD54250T** | DD54251 | --- | DD54250206**** | |
6 | DD56250 | DD56250T** | DD56251 | --- | DD56250206**** | |
8 | DD58250 | DD58250T** | DD58251 | --- | DD58250206**** | |
10 | DD510250 | DD510250T** | --- | --- | --- | |
12 | DD512250 | DD512250T** | --- | --- | --- |
* Supply 1/4” tube; discharge 3/16” tube
** Supply 3/8” tube; discharge 1/4” tube
**** Output volume is not adjustable and fixed at maximum