Explanation of Low Torque Operation
In 2012, we modified the SV-150, 4-way valve to lower the shifting torque. This allows operation at elevated working pressures. The high torque became an issue with current Shear-Ram-Boosters when operating at 3000 psi hydraulic pressure and 80 psi minimum air pilot, which was marginal with a 4” actuator cylinder mounted on the old SV-150. The operating torque at 3000 psi has been reduced to 42 ft-lbs from 130 ft-lbs for the selector and manipulator, and reduced to 100 ft-lbs from 160 ft-lbs for the bypass. This improvement also allows the SV-150 to be rated at 5000 psi if required.
Below, in Table 1, you will find the typical working operations and capabilities for each SV-150 rotor configuration.
Spare Parts and Repair Kits
Only the body and seal rings have been changed. The old seal rings are compatible with the new body, but the new seal rings are NOT compatible with the old body.
The old valve part numbers (shown in Table 2) are now obsolete and replaced by those shown in Table 3. The old repair kits and seal rings will continue to be manufactured and supplied to support existing valves in the field. The old SV-150 valves can be converted to the improved model by replacing the body and seal rings.
For future identification, the new valve part numbers will be stamped on the side of the body. Additionally, a dimple is machined into the bottom of the body for quick reference (as shown in Figure 1).
Table 1 – Typical Working Operations and Capabilities
| Rotor | Working Pressure (psi) | Torque
(Ft-Lbs) |
| Selector | 3000 | 42 |
| Selector | 5000 | 54 |
| Manipulator | 3000 | 42 |
| Bypass (3-pos.) | 3000 | 54 |
| Open Center | 3000 | 42 |
| Open Center | 5000 | 54 |
1 Cylinder size is based on rod end force with 1” maximum rod diameter and minimum torque-arm of one inch.
Table 2 – Old Repair Kit Part Numbers (standard service at 1500 psi)
(Kits are still available for existing product)
| Major Repair Kit | Minor Repair Kit | Seal Kit | O-ring Kit2 | |
| Selector | 40-1558 | 40-1559 | 40-1537 | 40-1749 |
| Manipulator | 40-1560 | 40-1561 | 40-1537 | 40-1749 |
| Bypass | 40-1767 | 40-1766 | 40-1537 | 40-1749 |
| Open Center | NR | NR | 40-1537 | 40-1749 |
2 O-ring kit includes six back-up rings
Table 3 – New Repair Kit Part Numbers (standard service at 3000 psi)
| Major Repair Kit | Minor Repair Kit | Seal Kit | O-ring Kit3 | |
| Selector | 40-2221 | 40-2220 | 40-2219 | 40-2239 |
| Manipulator | 40-2223 | 40-2222 | 40-2219 | 40-2239 |
| Bypass | 40-2225 | 40-2224 | 40-2219 | 40-2239 |
| Open Center | 40-2227 | 40-2226 | 40-2219 | 40-2239 |
3 O-ring kit includes three back-up rings
Table 3 – New Valve and Kit Part Numbers (water glycol service rated to 5000 psi)
| Major Repair Kit | Minor Repair Kit | Seal Kit | O-ring Kit3 | |
| Selector | 40-4002 | 40-4003 | 40-3482 | 40-2239 |
| Manipulator | 40-3945 | 40-3786 | 40-3482 | 40-2239 |
| Bypass | 40-4602 | 40-3787 | 40-3482 | 40-2239 |
| Open Center | Contact PacSeal | Contact PacSeal | 40-3482 | 40-2239 |
3 O-ring kit includes three back-up rings
Figure 1 – Identification of New Low Torque Design
