12
3. Reducer Module (Fig 10): The reducer module is
required for piloted models when pilot pressure exceeds 210
bar (3000 psi). These two-stage spool valves maintain a
reduced outlet pressure against variations in inlet pressure.
These valves are able to act as relief valves (at 50% of the
maximum flow) to prevent excess pressure being developed
when an actuator is subject to a reactive load.
4. Fast Response Option: Some applications require the
main stage spool to shift at a faster than normal rate. For
such applications, the fast response option is used. This
option requires the removal of an orifice plug within the main
stage body. When the orifice plug is removed, larger volumes
of fluid will enter the pilot valve section. When the pilot valve
shifts, the main stage spool responds at a faster rate. However,
this also generates transients that increase system shock.
For this reason, the fast response option is not recommended
when pilot pressures exceed 210 bar (3000 psi). Fast
response models have the letter ‘‘X’’ stamped into the unit
nameplate (i.e. DG5V8-**X-**-M-**-10). Refer to catalog
5007.02/EN/0196/A for response time data. Figures 20 and
21 show the location of the orifice plugs that must be
removed for the fast response option.
Figure 10. Reducer Module
1
2
5
4
3
7
6
8
9
11
10
12
13
14
Part No. Part Name
1
2
3
4
5
6
7
8
9
Plug
Back-up Ring
‘‘O’’ Ring
‘‘O’’ Ring
Spool
Body
Ball (2)
Spring Rest
Spring
Part No. Part Name
10
11
12
13
14
15
16
17
Spring Rest
‘‘O’’ Ring
Spring Housing
‘‘O’’ Ring
Adjuster Housing
Adjuster
Nut
Dowel Pin
16
15
17
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