Hello Sirs:
I have an hydraulic application: I have an hydraulic system consisting basically of a double pump driven by an electric motor. Each pump produces 16 gpm, 2000 psi, at 1760 rpm. actually each stream connect to a cylinder, so are 2 cylinders. I want to split each stream to connect 4 cilinders. I see an article where is recommended to use rotary type flow dividers beacuse are more accureate and its pressure drop is low compared with cartridge flow dividers.I have some questions:¿Do you recommend to use pressure relief valves in each cylinder?
¿Can I install the flow dividers after the pump discharge line, or after the directional valve?
¿Can I use one directional valve for a couple of cylinders, or is better one valve for each one?
Additional comments or suggestions are welcome
I´ll appreciate your answer.

Take a look at the Basic Ebook in Chapter 13 starting on page 9. This should answer some of your questions and give you some ideas on Flow Divider types and use.

The Circuits Ebook has a section on Flow Divider circuits showing different ways to apply the diferent types. That section will not be up for a few months since they are only putting up a chapter every 2-3 months.

I find the main diffeence in Spool Type and Motor type is the fact that a Motor type will plit the work on actuators that are not evenly loaded while Spool Type Dividers are primarily Pressure Compensated Flow Controls and generate a lot of heat if the load is one sided.

You only need one directional valve for each pair of cylinders and the Flow Divider has to be after the valve.

Spool typpe dividers are available in Divider/Combiners while motor type dividers must be used on both cylinder ports to make sure the cylinders stay level both directions.

Also, any typpe flow divider wust have some means to re-synchronize the cylinders since they never split flow exactly and even though they only lose or gain 0.002 per cycle they will get out of synch in a matter of time. The greater the load difference on each cylinder the quicker they get out of Synch.

The only DEAD ACCURATE way of Synchronizinng actuators is with Proportional or Servo Valve and feedback signals from the actuators to continuously make flow corrections as the actuators move.

Bud, Thanks for your comments I appreciate them.
Best regards.
Ramón