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Granger, IN | Below is a link to a Brand valve site. Whatever pressure that is seen on the controlled flow port will be seen by the pump. For example: you have the flow control valve set to deliver 5 GPM to a hyd. motor and it takes 1500 PSI for the motor to operate, if your supply pump is delivering 20 GPM it will be loaded at the 1500 PSI and the system (flow control valve) will be bypassing 15 GPM and creating approximately 15 HP of heat which is about 33750 BTU's per hour. This is why when you use an open center system with hydrulic motors, the motors need to be sized so that the excess GPM is not too much more than the motors need. The formula for BTU per hour is BTU/hr= PSI times GPM times 1.5. The amount of bypassed oil and this formula would be used to calculate the size of the oil cooler needed.
The advantage of the flow divider is that the flow to the motor will remain constant as long as the pump supply exceeds or equals the flow control valve setting ireguardless of the pressures on either port of the valve as long as it is below the main relief setting.
Hope I haven't added too much to your confusion, Good luck 90%ret'd
http://www.brand-hyd.com/series95/series95-info.htm | |
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Flow control valve operation question
