Flow Control
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Posted by: nargo ® 09/26/2006, 08:13:47 Author Profile eMail author Edit

I have a 4-way hydraulic servovalve to test. The spec requires connecting two of its active ports to a cylinder to control the flow (variable up to a max of 0.25 GPM) at 3000 psig. The specs do not provide any detail about this equipment, they just call it "flow analyzer cylinder". The only idea that I have is a hydraulic actuator which rod end is attached to a block driven by a linear motor. In this way, with the motor I can control the speed of the piston, hence I can control the flow to and from the servovalve and, at the same time, controlling the torque of the linear motor, I can adjust the resistance it applies on the rod of the cylinder, and with it I can adjust the pressure delivered by the servovalve. I would appreciate very much any feedback about this problem. It would be helpful if somebody can give me the name of a manufacturer of a flow and pressure controller that uses a hydraulic cylinder as the only controlling element (this is, not to actuate a control valve), because maybe my boss would decide for buying such an equipment instead of assembling it by ourselves from its individual components. And I really need help fast, because he wants results soon. Modified by nargo at Tue, Sep 26, 2006, 08:15:52

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Re: Flow Control
Re: Flow Control -- nargo	Post Reply	Top of thread	Forum

Posted by: rjbeng ® 09/26/2006, 21:40:54 Author Profile eMail author Edit

Just hook up your 3000 PSIG to the 2 ports with a flow turbine and a pressure relief valve back to tank? Add a couple needle valves and you are in business. You can fine tune the flow using the meter with the safety back up. I think I would also install a bypass valve to increase flexibility. This will also aid if you have a requirement for temperature within a range. Just be careful not to hydraulic lock the system by supplying the same pressure and flow to the 2 ports. Something you will have to evaluate based on the schematic and valve design. If you need a delta P then you may need to adjust the flow between the two ports.

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