Hydraulic Clamping Fundamentals

differential to observe expected results, allow for variances between gage accuracies, and some margin of error in setting individual devices. 6. Sequence pressure setting should never be below minimum required operating pressure of devices it is sequencing. 7. Avoid installing pressure limiting or pressure reducing valves ahead of directional control valves or sequence valves. 8. Running single and double acting devices in series (daisy chain) this will affect the return time on single acting devices. Pay particular attention to the plumbing installation in an effort to minimize return flow backpressure. 9. Do not allow return flow to tank to pressurize another circuit. 10. When stacking multiple directional control valves always use a check valve at each “P” port (pressure inlet port) on valve to avoid pressure drop in circuits already engaged when additional circuits are energized. 11. Double acting devices should be used in robotic systems wherever possible. This will make return of actuators positive, reducing probability of interference during load, and unload operations, as well as permit additional system monitoring. 12. Maximum velocity for high-pressure lines is 30 ft/sec. Maximum velocity for a return line is 10 ft/sec. It is recommended that velocity for single acting systems be

The operating pressures required. See VektorFlo® catalog for pressure required for clamp force on each specific actuator. Required pressure reductions per circuit. The cycle time required to clamp and unclamp. The sequence of operation. Type of control required. Coupled or de-coupled system. GENERAL DESIGN GUIDES: 1. Unless otherwise noted in the catalog all VektorFlo® components are rated for 5,000-psi maximum operating pressure. However, the system operating pressure is determined by the lowest pressure rating of a component in the system. It is important when designing a circuit that all devices including fittings, hoses, valves, tubing, and manifolds have a working pressure compatible with circuit pressure. Never exceed the maximum operating pressure of any device. 2. Fluid follows the course of least resistance, so the device that has the fewest line restrictions will generally activate first. 3. Always flush hydraulic passages, tubing lines, and hoses with a suitable safety solvent to remove chips, dust, dried drawing oil, and other debris (i.e. spider webs) before operating a system. 4. Avoid using sequence valves in series to control operations. Erratic performance can be expected due to valve pulsing. Since sequence valves are pressure sensing, plumbing them in parallel will not adversely effect the system performance. 5. The recommended pressure differential setting between all specialty valves is 500 psi. This is to allow enough pressure

maintained at a maximum equal to return line velocity to reduce effect of backpressure.

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Hydraulic Clamping Fundamentals Aug 09 Rev - D

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