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i do run vickers ele cntrol valves on other systems on my rig what valve where you thinking about? i am located in Richland wa

the 10 gpm is the slow feed a rapid feed pump of 100 gpm is used to get to the bottom or top the slow feed is for actuall drilling rod size of 4" stroke 30 ft but that shouldn't be relavent can you explain both ways the cheaper one as well as the more acurate way

Hi I have a drill rig that has a rotational head the head moves up and down and holds/raise/lowers the head the head has varible weight and needs to travel up and down at different rates and also different total pressures the basics are as follows 10gpm 3000psi gear pump directional control...