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Hydraulic spool valve question


mader656
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What Is the difference between a motor contol spool valve and a regular valve.

Note it's for the drive motors on my post driver.

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motor control spool has internal relief, which allows motor to have a 'soft' stop.

 If motor used with standard spool, case rupture can result due to momentum of driven load over rotating, causing motor to act as pump, pressure will spike, and the weakest thing in the system has to give.

 a standard spool can be used if back-to-back relief valves are plumbed into the motor lines, preferably right at the motor.

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I've got the Valves on the motors... good  just need a Motor spool and detent for the auger

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A motor with integrated relief valves will have spring loaded, shim adjustable cartridge  vales on both the input and the output lines of the motor.

 this is called a crossover relief, and bolts to the back of the motor housing.  

Some motors that are designed to run in both directions may have a third line connected to the case of the motor.

This is the drain line. It must be connected to the tank, it takes pressure off of the shaft seals.

 a further explanation of the motor spool function is the A port and the B port are combined in the neutral position.

 So if you tried to use a motor spool on a cylinder, there would be  no load holding function with the control assembly in the neutral position.

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