Experiment with a check valve

Check valve experiment

Suggested exercises and observations

1. Select the 'Non-return check valve' from the drop down menu and experiment with load and pressure settings.

2. Select the 'Pilot to open logic valve' from the drop down menu.

3. Operate the pilot valve and experiment with the pressure and load settings to observe what happens and how the valve functions.

4. Select the 'Pilot to close logic valve' from the drop down menu.

5. Operate the pilot valve and experiment with the pressure and load settings to observe what happens and how the valve functions.

Experiment 1: Select the pilot to open valve from the drop down menu, increase the cylinder load to maximum.

Question 1: Why doesn't the poppet open?

The cylinder load is acting on a larger area that is trying to shut the valve than the area that is trying to open the valve.

Experiment 2: Increase the supply pressure.

Question 2: Will the poppet valve ever open?

No. The pressure on the pilot side of the spool section will always be lower than the spring + supply + load pressure.

Experiment 3: Activate the pilot valve to feed the back of the poppet with the supply pressure.

Question 3: At what point does the load pressure balance out the supply pressure? Click the oval yellow button to reset the cylinder.

In the design modelled the maximum load pressure just balances the maximum supply pressure.

Experiment 4: Change the cylinder diameter by click on the yellow arrow buttons.

Question 4: How does the cylinder diameter affect the load pressure acting on the poppet valve middle land area?

Increasing the diameter of the cylinder will reduce the load pressure, relative to the supply pressure. Reducing the diameter will increase the load pressure.

Experiment with a check valve

Advanced Check Valve Test

Check valve experiment

Suggested exercises and observations