VDS Pumps: Variable Displacement
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VDS vacuum pumps can provide over 20" Hg (68 kPa) and their straight through non-clog design is ideal for very dusty and dirty applications such as bag filling or handling ceramics or masonry products. The square body and two mounting holes makes the VDS pump easy to attach to any flat surface. An ST Straight Thru silencer will not accumulate debris and will pass it out with the exhaust air. For less critical applications where cost is more of an issue, a conventional AA silencer may be used. |
Operation
Loosen the jam nut and turn the diffuser nozzle clockwise, by hand, until it contacts the inlet nozzle. With the work piece against the suction cup or holding fixture, supply regulated compressed air to the side air supply port and gradually rotate the diffuser nozzle to adjust the annular gap between the two nozzles until the desired vacuum level or vacuum flow is achieved. To minimize air consumption, use the lowest pressure air supply that will yield the desired results. Turning the diffuser too far open will suddenly cause a decrease in performance and this point will vary depending on the operating air pressure.
Ingested debris passes directly from end-to-end through the pump bore without any turns and without passing through the annular venturi created by the inlet and diffuser nozzles, so there is no opportunity for clogging as long as the pump bore is large enough to pass the largest debris particle. As the pump bore size is increased, it can also generate more vacuum flow to overcome porosity and leakage. |
| VDS 150 |
0.150 (3.8) |
G 1/8 NPSF |
1/4" OR G1/4 |
1/4" OR G1/4 |
1.38 (35) |
.86 (21.8) |
1.25 (31.8) |
3.81 (96.7) |
1.02 (25.9) |
.84 (21.3) |
.74 (18.8) |
.22 (5.5) |
2.26 (57.4) |
| VDS 200 |
0.200 (5.1) |
G 1/8 NPSF |
1/4" OR G1/4 |
1/4" OR G1/4 |
1.38 (35) |
.86 (21.8) |
1.25 (31.8) |
3.81 (96.7) |
1.02 (25.9) |
.84 (21.3) |
.74 (18.8) |
.22 (5.5) |
2.26 (57.4) |
| VDS 250 |
0.250 (6.3) |
G 1/8 NPSF |
1/4" OR G1/4 |
1/4" OR G1/4 |
1.38 (35) |
.86 (21.8) |
1.25 (31.8) |
3.81 (96.7) |
1.02 (25.9) |
.84 (21.3) |
.74 (18.8) |
.22 (5.5) |
2.26 (57.4) |
| VDS 375 |
0.375 (9.5) |
G 3/8 NPSF |
3/8 NPSF |
1/2" OR G1/2 |
1.72 (43.7) |
1.50 (38.1) |
1.75 (44.5) |
5.99 (152) |
1.32 (33.5) |
1.35 (34.3) |
.98 (24.9) |
.26 (6.6) |
4.78 (121.4) |
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| |
|
0 |
5 |
10 |
15 |
20 |
25 |
| VDS-150 |
3.2 |
0 |
1.3 |
1.7 |
2.4 |
3.2 |
4.5 |
| VDS-200 |
6.0 |
0 |
2.4 |
3.7 |
4.7 |
6.0 |
6.8 |
| VDS-250 |
10.0 |
0 |
4.0 |
6.0 |
8.3 |
9.7 |
12.0 |
| VDS-375 |
30.0 |
0 |
6.2 |
11.5 |
17 |
21 |
29.0 |
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