Anti-Stall And Remote Relief Valve
The anti-stall valve in combination with the remote
relief valve prevent hydraulic overloads at engine
idle, which could cause excessive vibration and
engine stalling. At engine idle, the anti-stall valve
opens ports to the hydraulic control valve and the
remote relief valve. If the hydraulic control valve is
used, the pressure in the oil line from the priority
valve to the anti-stall valve will increase. This
pressure increase will be limited by the remote relief
valve to 8250 kPa (1200 psi) (6R7072 Relief Valve).
This relatively low system pressure allows for a
smoother engine idle because the engine is not
overloaded by the hydraulic pump with an engine
speed of 700 rpm minimum.
As engine speed increases the hydraulic system oil
flow increases. The anti-stall valve senses this flow
increase and closes the output port to the remote
relief valve. Flow is now directed to the main control
valve only and full system pressure can be achieved.
14 of 29
New Hydraulic Systems
Systems Operation
Summary of Contents for D20S-2
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