Operation 3
HydraulicPump Operation Manual
Operation
PRIMING THE PUMP
1 Put a small amount of uid in the Reservoir; enough to cover the bleed-o valve hole in the
bottom of the reservoir.
The easiest way to ll the Reservoir is to remove the Vent Plug, and use the uid bottle to squirt
uid into the Reservoir.
2 Turn the variable volume handle clockwise until it stops turning.
3 Open the Bleed-o
Valve by turning it counter-clockwise, then squeeze the Handle.
Fluid and trapped air should circulate out of the Bleed-o Valve hole back into the Reservoir.
4 Squeeze the Handle repeatedly until no air is seen coming out of the Bleed-o
Valve hole.
5 Fill the Reservoir, in prepation for use.
Note: We recommend that you keep the pump primed.
USING THE PUMP
1 Shut-o the Bleed-o Valve.
2 Squeeze the handle until
uid is seen in the NPT port.
3 Open the Variable Volume Handle counter-clockwise until it stops.
4 Attach a pressure standard to the NPT port.
5 Remove the CPF Plug and connect your CPF hose.
W
e suggest that you squeeze the pump handle to ll the hose with uid, prior to connecting
the other end of the hose to the instrument to be calibrated.
6 Squeeze the pump handle to generate 20–30 psi and loosen the CPF
tting connection at the
end of the hose to bleed air from the system through the CPF weep / bleed hole.
7 Repeat until no air escapes.
T
his minimizes the volume of air you will need to compress to achieve your desired pressure. In
fact, the less air you have in your system, the better the pump will perform.
TO ESTABLISH A ZERO PRESSURE REFERENCE
1 Check that the pump at the same elevation as the device being tested
2 Open the Bleed-o
Valve.
3 Close the Bleed-o
Valve, and repeatedly squeeze the Handle until you are close to, but not
greater than, your desired pressure point.
4 Use the the Variable Volume Handle to adjust the pressure to precisely your desired pressure.
T
he pressure may initially appear to be unstable, and dropping. This is usually due to either a
small amount of expansion of the hose under pressure, and/or residual air or gas dissolving into
the hydraulic uid. If there are no leaks, both of these e ects will diminish until the pressure is
stable. Of course, very high resolution pressure calibrators will detect this e ect better than low
cost mechanical gauges.
Bleed-o Valve
Variable Volume Handle
Vent Plug
Reservoir
Handle
(7 pages)
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