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Control valve

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AJ

06-26-2000 04:23:04




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I have a question about the 9N hydraulic control valve operation. Does it block the intake of oil into the pump,out of the pump or bypass the oil back into the pump housing? I was asked this question and wasn't sure. All I know is it controls the flow of oil to the lift cylinder.
Would appreciate clarification from someone in the know.




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llamas

06-26-2000 07:23:33




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 Re: Control valve in reply to AJ, 06-26-2000 04:23:04  
The pump on a 9N/2N is entirely controlled from the inlet side. The control valve is actually a double-ended spool with tapers on both ends. The body it slides in has two ports, one inlet and one exhaust. The valve spool can cover both ports (nothing happens) or uncover one while leaving the other covered. If the inlet port is uncovered (exhaust port remains covered), the pump sucks oil, pressurizes it and sends it up to the lift cylinder. It will keep doing that as long as the inlet port is uncovered - that's why the control linkage has a "toggle" link in it, operated by the rear face of the ram piston, which "trips" the linkage when the ram reaches full extension and restores the valve to the center position. If the valve spool is now moved in the opposite direction, the exhaust port is uncovered (inlet port remains covered) and the ram cylinder drains out. In the "neutral" position, oil neither enters nor leaves the pump, and the pump idles. The check valve prevents backflow through the inlet side.

A delightfully simple system, Ferguson's patent. However, prone to leakage. The rate of response of the hitch is defined entirely by the taper on the valve spool ends, and depends too much on the viscosity of the oil. Later designs (the 8N) ironed out some of these difficulties.

HTH

llater,

llamas

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