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Check Valve Test

Experiment with this simple check valve circuit

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Operate this hydraulic check valve simulation

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Suggested exercises and observations

1. Select the 'Non-return check valves' from the drop down menu 4. Click the question mark (?) and sound button for additional advice.

♦ Increase the pressure to observe how the check valve only allows flow in one direction.

♦ Raise the cylinder to its mid-position and then lower the supply pressure to see how the check holds the cylinder in position.

♦ Change the load on the cylinder and observe how the cylinder line pressure, and the pressure on top of the check valve poppet, change.

2. Select 'Pilot operated relief valve' from drop down menu 5.

♦ Reduce the spring pressure and experiment with supply pressure and cylinder loads.

♦ Observe how the check valve acts as a simple relief valve and limits the pressure on the cylinder line.

♦ Observe how the check valve maintains a positive pressure on upstream of the valve.

Experiment 1: Select the non return check valve (drop down menu 4) and increase the supply pressure

Question 1: When will the check valve open?

Check valves open when the supply pressure is greater than the load and spring.

Experiment 2: With the cylinder raised, increase the load pressure on the valve.

Question 2: How can you open the valve to lower the cylinder?

You can't. Wait overnight and perhaps the leakage will let it lower gradually.

Experiment 3: Select the pilot operated relief valve (drop down menu 5) and reduce the spring pressure. Adjust the cylidner load and supply pressure.

Question 3: What pressure is the check valve spring rate controlling?

It maintains the pressure on the cylinder line. Limiting the maximum pressure.