3. OPERATION
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© 2004-2008 DH Instruments, a Fluke Company
Press down on the pump handle but do not release your downward force when the pump
gets to end of stroke or becomes to difficult to push down. While maintaining the
downward force on the pump handle, close the reservoir shut off valve to capture the
priming pressure.
Do not attempt to generate greater than 700 kPa (100 psi) using the reservoir priming pump.
Once the system is filled and primed, use the variable volume to generate pressure to the
desired pressure set point (see Section 3.2.2).
When the reservoir cover vent valve is closed, the reservoir is not connected to atmosphere
so opening the reservoir shut off valve and the test shut off valve may not fully vent the system
connected to the MPG2. To be sure the system is fully vented to atmosphere, OPEN the reservoir
cover shut off valve and/or disconnect at the TEST port.
3.2.2
GENERATING AND ADJUSTING PRESSURE, VARIABLE
VOLUME AND FINE ADJUST VALVE
The variable volume can generate very high pressure very quickly. When using the variable
volume, use caution not to generate pressure more quickly than desired and not to exceed the
pressure rating of the MPG2 (see Section 1.2) or any component of the system to which it is
connected.
Before attempting to use the MGP2 to generate pressure, the system to which it is connected
should be as free of air as possible. See Section 3.2.1 to fill and prime the test system.
Once the system to which MPG2 is connected, filled and primed, to generate and adjust
pressure proceed as follows:
Open the reservoir shut off valve to connect the reservoir to the variable volume.
Close the TEST shut off valve to avoid ‘pulling’ oil out of the test system in step .
Rotate the variable volume CCW until the piston position indicator is at the beginning of
its stroke (indicator white).
Close the reservoir shut off valve to shut off the reservoir from the variable volume.
Open the TEST shut off valve to connect the variable volume to the test system.
Rotate the variable volume CW to increase pressure to the desired set point. Using the
variable volume, it should be easy to adjust the set pressure within 700 kPa (100 psi) or
less of the desired pressure.
To adjust pressure more finely than is possible with the variable volume, use the fine
adjust valve (see Section 3.1.2).
If the variable volume runs out of stroke (piston position indicator red and variable volume
will not rotate CW further) before the desired set pressure is reached, the variable
volume can be isolated from the TEST port and refilled to continue generating pressure
(see Section 3.2.3).
To reduce pressure, rotate the variable volume CCW.
To vent the system to atmosphere, once the pressure is low enough to be safely be
dropped very rapidly, open the reservoir shut off valve (with the test shut off valve open).
