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Understanding a basic hydraulic circuit 01
- 1. Hydrexa Consulting Ltd •Hydraulics made easy. In this slideshow:- – Slide 2, Click on the shapes to find out what each item is called – Press each key to find out what happens next. There are animations – Watch what happens to the gauge at each step – Finally, add an accumulator for surge protection www.hydrexa.com Tel 01522 589067
- 2. What are the components called? Hydraulic Cylinder Directional valve Hydraulic Pump Pressure Gauge Electric motor Relief valve Reservoir Ortank www.hydrexa.com Tel 01522 589067
- 3. Hydrexa Consulting Ltd •Ok, you’ve got the names of everything right, so lets have a look at the procedure that happens when we start up the circuit. www.hydrexa.com Tel 01522 589067
- 4. Hydrexa Consulting Ltd •First thing we do is ‘blip’ the electric motor for a just a few seconds. • Why do we do this? www.hydrexa.com Tel 01522 589067
- 5. Hydrexa Consulting Ltd •Well it’s a good check to find out if we have wired the electric motor correctly. • If its wrong, we could destroy the pump by running it backwards. (Shouldn’t have told you that. Its good for my spares sales!) www.hydrexa.com Tel 01522 589067
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- 7. Hydrexa Consulting Ltd •This is a circuit where the pump is loaded at start up. • The pump delivers the oil and quickly starts to use the relief valve. If run for too long, it would heat up the oil. • So lets operate the valve to extend the cylinder www.hydrexa.com Tel 01522 589067
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- 9. Hydrexa Consulting Ltd •Did you see how the pressure gauge changed when the cylinder moved? • Did you notice what happened to the level of the oil? • Then the relief valve opened again when the cylinder extend its full distance • Lets retract the cylinder back www.hydrexa.com Tel 01522 589067
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- 11. Hydrexa Consulting Ltd •Well it all looks good. But the gauge is usually filled with glycerine to stop the pointer from vibrating too much. • If we put a data logger on the pressure, we can see other things that’s happening • Have a look at the graph. The column at the bottom is in fractions of seconds www.hydrexa.com Tel 01522 589067
- 12. Relief valve Reliefvalve Extend Before the relief opens Retract www.hydrexa.com Tel 01522 589067 0.05 seconds (that’s fast)
- 13. Hydrexa Consulting Ltd •Looks a bit violent with all those spikes, but most systems can cope with them. • They can vary depending on pump size, pipe size etc • But we can smooth them out by adding an accumulator www.hydrexa.com Tel 01522 589067
- 14. Adding an accumulator Hydraulic Cylinder Directional valve Hydraulic Pump Pressure Gauge Electric motor Relief valve Hydraulic Cylinder www.hydrexa.com Tel01522 589067 The accumulator absorbs the spike
- 15. Hydrexa Consulting Ltd •Hope you’ve enjoyed the slides and learnt something about hydraulics • If you need something hydraulically explained then email or call me on:- • sales@hydrexa.com • UK (0044) (0)1522 589067 www.hydrexa.com Tel 01522 589067