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This message has been edited. Last edited by: maglub,

maglub asked:

quote:

could manufacturers make it proportional FDCV? whats gonna happen to proportional PCV(pressure control valve).

You can find both of these valves in a Vickers, Rexroth or Parker catalog. Also, other manufacturers make some or all of these valve configuratons.

I took "F" for Flow??????

maglub asked:

quote:

can you tell me more about how a pilot operated proportional valve and a simple servo valve works? To be specific can you illustrate more on how it is being piloted?

You can see my simplified explanation of Infinitely Variable Valves in Chapter 12 of the Basic book here:
http://www.hydraulicspneumatics.com/200/eBooks/

Sauer has a differential pressure valve for (indirectly) controlling force, MCV102 series, we use many. It is a differential pressure out, and on a single rod cylinder, is not a direct force control, but close enough in many applications.
For true high performance force control, Peter's post.

Everyone is very busy, no sense reinventing the wheel explaining over and over in these postings how a certain valve works. I'd rather have a link than an abbreviated description.

k

TOTAL DISCUSSION TABLE HAS TAKEN U TURN . AGAIN WE REACHED AT F.... . I WILL ADD F FOR... FLOW TO ALL VALVES PRESSURE , FLOW CONTROL , DIRECTION CONTROL, HYDRAULI MOTOR , HYDRAULIC PUMP . THEY FUNCTION ONLY IN ONE PRINCIPLE , FLOW IS PRESENT OR NOT . THIS IS THE FLOW WHICH COVERS PRESSURE/VELOCITY/DATUM HEAD INVISIBLE PART . ALL FORCE , ACCELERATION , DEACCELERATION , FORCE ARE SECONDARY PARTS ....VISIBLE .