At our Hydrostatic Pump Repair Site, we offer many types of Hydrostatic Transmission Repair and information relating to Hydrostatic Parts
Today we will discuss:

External Pilot Pressure Option for Solenoid Control

There are other options for a solenoid control and that is using external pilot pressure. How this is used, is as follows; pressure for the pilot valve comes from the pressure passage in the main valve. There are times you would not want this, such as when the system pressure goes up or down to a degree that the pilot pressure to shift the main valve spool may not be at your systems disposal. If this happens the pilot pressure may derived from another application.

Another type of excessive use is when the system operating pressure is at a high level (1500 PSI or more). This high pressure that is generated to the pilot valve could cause the main valve spool to be quickly accelerated and shift to swift, resulting in hydraulic shock. To eliminate this occurrence, the pilot valve is equipped with a fluid at a reduced pressure (300PSI normal).

Solenoid controlled, pilot operated, open center directional valves usually need back pressure check valves. This check valve could operate the pressure port of the main valve. With the check valve in this locale, the pressure differential across the valve doubles which may be not the result you were looking for. In any case, a larger check valve may be settled upstream from the directional valve. The pilot valve can be externally outfitted with pressure upstream from the check.

If you need further assistance on this subject, please let us know by leaving a comment or calling us at 800-361-0068

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