Valve adjustment chart – Number of turns
Here you can find the online chart which let you easy adjust any flow or pressure valve using its settings range and the available number of turns.
Tag Archive: valve
Pilot Operated Check Valves or Counterbalance Valves?
Summary:
- When use Pilot Operated Check valves?
- When use Counterbalance valves?
- Design advises for topic valves.
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First of all, Pilot Operated check valves are NOT a cheap solution of Counterbalance valves.
Yes, both of them have next the same benefits:
- Prevent a load from dropping in case of hose or tube failure.
- Prevent a load from drifting caused by directional control valve spool leakage.
- Leak-free load holding.
But each of them has the specific applications.
Pilot ratio & pilot pressure of counterbalance valves
Summary:
- Understanding the pilot ratio of the counterbalance valves
- Calculations the pilot pressure of the counterbalance valves for different applications
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Lower pilot ratios will increase system stability and provide better motion control. Therefore, the vast majority of counterbalance applications are satisfied with a 3:1 pilot ratio.
Higher ratios will be more efficient (reduce heat generation) but at the cost of stability and smooth motion control. This is why 10:1 pilot ratio valves, generally, should be avoided. But, sometimes, on motors high pilot ratios will provide adequate dynamic control.
Two areas work to open a counterbalance valve, the relief area (port 3) and the pilot area (port 1); the pilot area divided by the relief area equals the pilot ratio:
