
23
GB
4. Design and funcon
4.5 Funcon
Operaon of the pressure balance is controlled by the two valves
A
and
B
on the top
of the reservoir/high pressure cylinder block. When inially priming the system valves
A
B
B
and
are opened to ill the system with oil from the reservoir. Valve
is then closed
f
with valve
le open and the screw pump operated to provide the lower test pressures.
A
To provide the higher pressures valve
A
is closed to seal of the test circuit from the low
pressure part of the screw pump and valve
is opened to allow the liquid in the low
B
pressure part of the screw pump to return to the reservoir as the pump is operated. This
ensures that the pump can be operated without having to put large forces on the screw
pump handwheel. To release the test pressure the screw pump is wound out and valve
A
is opened.
Reservoir
Valve A
Hand pump
Valve B
Manual M
LDW-HK
odel
LR-
Cal
Содержание LDW-HK
Страница 16: ...16 GB 3 Speci ica ons f Side view Dimensions in mm without masses Front view Manual M LDW HK odel LR Cal...
Страница 21: ...21 GB 4 Design and func on G D C F E H J K Sec oned view of screw pump Manual M LDW HK odel LR Cal...
Страница 46: ...46 GB Manual M LDW HK odel LR Cal...
Страница 91: ...91 No zen Notes Anleitung Modell LDW HK Druckwaage Kolbenmanometer LR Cal...