TSE PTV100/72, Руководство пользователя

Страница: 273 / 480

12
saue
Series 90 Functional Description 2
2.4.10 Pressure Override (POR) - 180
Frame Size Only
The pressure override valve (POR) modulates the
control pressure to the displacement control to main-
tain a pump displacement which will produce a sys-
tem pressure level less than or equal to the POR
setting. For unusually rapid load application, the high
pressure relief valve function of the multifunction
valves is available to also limit the pressure level.
The pressure override consists of a three-way nor-
mally open valve which operates in series with the
pump displacement control. Control supply pressure
is normally ported through the pressure override
valve to the displacement control valve for controlling
the pump's displacement. If the system demands a
pressure above the override setting, the POR valve
will override the control by reducing the control pres-
sure supplied to the displacement control. As the
control pressure reduces, the internal forces tending
to rotate the swashplate overcome the force of the
servo pistons and allow the pump's displacement to
decrease.
Shuttle
Valve
Multi-Function Valve
Multi-Function Valve
Bypass Hex
Adjustment
Charge Pressure
Relief Valve
Pressure
Override
Control Valve
To Control
Port "A"
Port "B"
Pressure Override - 180 Frame Size Only
90000802
CONTENTS