| Pump Head Torque Requirements Use this guide to help you select the number of pump heads and tubing formulations that can be used with your drives. To calculate torque: - To define your torque needs, consider the following:
- Discharge pressure (increase necessary torque)
- Tubing material (firm or soft material)
- Multiply by the number of pump heads you would like to use.
- See drive specifications for maximum torque limits. (Consider starting torque when selecting a drive). The torque of the drive must exceed the starting torque value for the pumphead.
- Several factors influence starting torque:
- The age of the tubing and its formulation.
| Example:
Using one EASY-LOAD® II pump head with L/S® 15 NORPRENE® tubing requires that the drive be capable of supplying at least 115 oz-in (8.6 kg-cm) of starting torque. When using two EASY-LOAD II pump heads with L/S 15 NORPRENE tubing, you will need a drive capable of supplying 205 oz-in (15.0 kg-cm) of starting torque. |
PTFE Pump Head Torque Specifications
| Catalog number | HV-07090-62 | HV-07090-42 |
| Discharge pressure | 0 bar (0 psi) | 5.2 bar (75 psi) | 0 bar (0 psi) | 3.5 bar (50 psi) |
| Start | 5.8 (80) | — | 13 (180) | — |
| Average | 2.16 (30) | 2.88 (40) | 2.5 (35) | 5.40 (75) |
| Peak | 3.24 (45) | 5.49 (75) | 6.48 (90) | 12.6 (175) |
Starting Torque for EASY-LOAD II Pump Heads*
Tubing
size | Number
of pump
heads | Silicone/
C-FLEX® | TYGON®/
TYGON LFL | NORPRENE®/
PHARMED® | VITON® | TYGON food |
| kg-cm | oz-in | kg-cm | oz-in | kg-cm | oz-in | kg-cm | oz-in | kg-cm | oz-in |
| L/S® 13 | 1 | .79 | 11 | 1.2 | 17 | 1.4 | 20 | 1.2 | 17 | 5.8 | 80 |
| 2 | 1.2 | 17 | 1.7 | 23 | 2.5 | 35 | 1.5 | 21 | 7.2 | 100 |
| L/S® 14 | 1 | 1.2 | 16 | 1.9 | 27 | 2.9 | 40 | 1.7 | 23 | 6.5 | 90 |
| 2 | .07 | 25 | 4.0 | 55 | 5.0 | 75 | 2.9 | 40 | 9.7 | 135 |
| L/S® 16 | 1 | 1.2 | 16 | 2.9 | 40 | 3.2 | 45 | 2.5 | 35 | 6.5 | 90 |
| 2 | 2.5 | 35 | 5.0 | 70 | 6.5 | 90 | 5.4 | 75 | 11.9 | 165 |
| L/S® 25 | 1 | 2.2 | 30 | 3.6 | 50 | 3.6 | 50 | 2.2 | 30 | 5.4 | 75 |
| 2 | 3.6 | 50 | 6.5 | 90 | 7.2 | 100 | 4.3 | 60 | 13.3 | 185 |
| L/S® 17 | 1 | 2.5 | 35 | 5.4 | 75 | 8.6 | 120 | 3.6 | 50 | 8.6 | 120 |
| 2 | 4.0 | 55 | 6.8 | 95 | 16.1 | 224 | 6.9 | 96 | 17.3 | 240 |
| L/S® 18 | 1 | 3.6 | 50 | 3.6 | 50 | 8.6 | 120 | 5.4 | 75 | 8.6 | 120 |
| 2 | 5.0 | 70 | 7.9 | 110 | 13.7 | 190 | 8.1 | 112 | 17.3 | 272 |
| L/S® 15 | 1 | 5.0 | 65 | 6.5 | 95 | 8.3 | 115 | 4.7 | 65 | 20.2 | 280 |
| 2 | 6.5 | 90 | 8.6 | 120 | 15.0 | 208 | 8.1 | 112 | 32.3 | 448 |
| L/S® 24 | 1 | 4.0 | 55 | 7.2 | 100 | 8.6 | 120 | 7.6 | 105 | 21.3 | 295 |
| 2 | 5.8 | 80 | 9.7 | 135 | 11.5 | 160 | 8.6 | 120 | 30.0 | 416 |
| L/S® 35 | 1 | 5.8 | 80 | 7.2 | 100 | 11.1 | 155 | 7.9 | 110 | 23.0 | 320 |
| 2 | 8.6 | 120 | 10.4 | 144 | 20.1 | 280 | 12.7 | 176 | 35.1 | 488 |
| L/S® 36 | 1 | 5.0 | 70 | 10.8 | 150 | 11.0 | 153 | 7.2 | 100 | 24.4 | 340 |
| 2 | 9.2 | 128 | 17.6 | 244 | 21.3 | 296 | 11.5 | 160 | 35.8 | 498 |
*NOTE: Starting torque values for the L/S Standard, QUICK LOAD®, AND EASY-LOAD pumpheads are less than the L/S EASY-LOAD II.