Danfoss SystemStak DGM 5 Series Technical Information page 3

Easy to Understand, Easy to Design
SystemStak circuitry is best shown using slightly di erent
symbols than those for traditional valve configurations. Each
SystemStak symbol has the same basic form and size as
shown in Figure 1.
P
Figure 1.
P
Figure 2.
For ease of understanding, remember the directions of flow
for each line, and that all four flow paths pass through each
valve (see Figure 2). For clarity, directional valves are drawn
vertically in SystemStak circuit diagrams (see Figure 3.)
P T
Figure 3.
Each station (valve stack) is a combination of functions. When
designing and assembling SystemStak valves, care must be
taken to ensure that they interact as required by stacking
the functions in the correct sequence (see Figure 4). Direct
check valves should be placed closest to the directional
valve. Relief valves should normally be positioned next to the
mounting surface (i.e. at the bottom of the stack). When both
a flow control and a pilot operated check valve is required, it
is recommended that the flow control valve be between the
check valve and the actuator to prevent check valve chatter.
T B A
T B A
B A
DGMPC-5-AB-BA-3 0
DGMFN-5–Y - A-B-30
P
Figure 4.
A combination of directional valve, SystemStak valve(s) and
subplate/ manifold block (Figure 5 single station subplate and
Figure 6 multi station manifold) completes the assembly.
P
T
Figure 5.
B A
P
T
Figure 6.
Figure 7 represents a complete SystemStak system, showing
typical use of functions available from this range. The circuit
diagram also shows the use of a tapping plate for accessing
line pressure readings, and a blanking plate to close o an
unused station of a multi-station manifold.
DGMC-5-BA-30
DGMPC-5-AB-BA-3 0
DGMC-5-PT -30
DGMX2-5-PP-30
P
T
B A
Figure 7.
DGMC-5-P T-30
T B A
B A
B
DGMX2-5-P A -30
DGMFN-5-Y -A-B-30
B A B A
A
Blanking
plate
3