Baker Hughes Druck PV411, Инструкция по эксплуатации

Страница: 9 / 11

Copyright 2000 Baker Hughes Company.
4 | PV 411A Instruction Manual–English
vacuum priming sequence above a second time, to
verify that any air in the system has been removed.
7. The pump and connected system is ready for use.
4.4.2 Pre-filling
1. Connect the equipment as detailed “Operation” on
page 2.
2. Turn the selector valve fully clockwise (in) position.
3. Loosen the reservoir cover lock nut (1) to open the
reservoir cover (2) and let atmospheric pressure into
the top of the reservoir.
4. Open the bleed valve on the UUT.
5. Carefully operate the scissor-action handles to fill the
system. Stop pumping when fluid comes out of the
bleed valve.
6. Close the bleed valve on the UUT.
7. If necessary, top-up the reservoir to the 2/3 level with
clean fluid.
8. Secure the reservoir cover by tightening the reservoir
cover lock nut (1).
9. The pump and connected system is ready for use.
4.5 Generating Hydraulic Pressure
(Figure A1)
Note: Pressurizing a fluid generates heat. A fluid heated or
cooled in an enclosed volume causes a pressure change.
Allow enough time to thermally stabilize.
1. If necessary, set the PRV see following section.
2. Open the selector valve (7) counterclockwise 1 turn.
3. Screw the volume adjuster (3) fully out
(counterclockwise).
4. Close the selector valve (7).
5. Use the scissor-action handles (5) to generate the
initial pressure.
6. Then turn the volume adjuster (3) clockwise to
generate the required pressure, allow time for thermal
stabilization.
7. To reduce the pressure, turn the volume adjuster (3)
out (counterclockwise) to the required pressure.
8. After completion, turn the volume adjuster (3) fully out
(counterclockwise) and turn the selector valve (7) to
depressurize the pump. Disconnect from the pipes and
equipment.
4.6 Setting Pressure Relief Valve
(Figure A3)
The pressure relief valve (PRV) can be set at pressures
from 30 to 700 bar (500 to 10,000 psi).
If the system pressure exceeds the set pressure, the PRV
opens and vents fluid through the inlet port to the reservoir.
When the system pressure decreases below the set
pressure, the PRV closes.
Key to Figure A3
1. PRV locking screw (quantity 2)
2. PRV lock nut (with left-hand thread)
3. PRV adjusting nut (with left-hand thread)
4.6.1 To set the PRV:
1. Connect a suitable pressure indicator to either outlet
port (Figure A1) (2) or (6). Fit a blank to the unused
port.
2. Increase pressure until the relief valve operates.
3. Loosen the two PRV locking screws (1).
4. Loosen the PRV lock nut (2) by turning clockwise.
5. Set the relief pressure by turning the PRV adjusting nut
(3).
To increase pressure: Turn the PRV adjusting nut (3)
counterclockwise.
To decrease pressure: Turn the PRV adjusting nut (3)
clockwise.
6. After setting the PRV, hold adjusting nut (3) in position
and tighten the locking nut (2).
Note: The locking nut has a left-hand thread.
7. Check the operation of the PRV. If necessary reset the
PRV.
8. Secure the locking nut by tightening the two locking
screws (1).
4.7 Fault Finding
If the system pressure reduces, check the following:
1. Check the selector valve (Figure
A1) (7) is in the
correct position and properly tightened.
2. Allow sufficient time after pressure generation for the
temperature to stabilize. The larger the system volume,
the longer the time for thermal stability.
3. Check the adaptors, flexible pipe and connections
between the pump and equipment under test for leaks.
Tighten any loose joints and replace any seals that are
worn or damaged.
4. In hydraulic mode, if the volume adjuster can be wound
fully in, but maximum pressure cannot be achieved, or,
if pressure can be achieved, but an initial slow
reduction appears to be present, there is probably air
trapped in the system. Without disconnecting any
pump or DUT connections, Re-prime using the vacuum
priming method and repeat.
5. Check PRV pressure setting.
If, for any reason, a fault occurs within the pump, it is
recommended that the equipment be returned to an
appointed agent.
CAUTION
Do not exceed 700 bar (10,000
psi). This can damage the internal seals of the
PRV and the PV 411A