Ametek CHANDLER ENGINEERING Twin UCA 4262, Руководство по эксплуатации

Страница: 11 / 40

SECTION 2 – OPERATING INSTRUCTIONS 2-1
Section 2 – Operating Instructions
Front Panel Controls
The figure above shows the front panel and all the associated controls. The description of
each control is described below.
Pump Pressure Adjust Regulator
This regulator is used to control the pressure of the air supplied to the pump, which is directly
proportional to the hydraulic pressure output of the pump. As the air pressure increases, the
hydraulic pressure increases. Turn the regulator knob counterclockwise to decrease air
pressure to the pump, clockwise to increase the air pressure.
If the regulator is set to a value and the pump switch is turned to the ON position, the pump
will increase pressure until the pneumatic force of the air (air pressure multiplied by pneumatic
piston area) equals the hydraulic force of the pressurizing water (water pressure multiplied by
pump piston area). At this point the pump will cease to stroke. If the water pressure falls for
some reason, a force imbalance will be created between the pneumatic and hydraulic sides of
the pump and the pump will begin to stroke and increase the hydraulic pressure until it is
balanced with the pneumatic pressure, then it will again stop pumping. In this way, the pump
may be used as a pressure control device (combined with the relief valve) to establish the
lower pressure limit for a test. This will be discussed further in the section
Running a Test
.