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Power loss considerations, Power loss considerations 26 – MTS Series 685 Hydraulic Grip Supply User Manual

Page 26

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Series 685 Grip Supply Product Information

26

Power Loss Considerations

Safety

Power Loss Considerations

For Series 685 stand-alone grip supplies, fluid pressure is locked in the grip by
means of the direction control valve. If power fails, this valve will leak drops
until the pressure in the grip is relieved. Sudden motion of the grips causing a
specimen to fall out is not likely. But, over time the clamp load will be removed
and a baseplate mounted actuator piston rod will settle, causing the specimen to
pull out of the grip.