Build a Compact, Cost-Effective, Reliable Hydraulic
System with Vickers SystemStak
t
Valves
Reduces System Space
Requirements
SystemStak valves make compact
hydraulic systems in which specific
function valves are “sandwich” mounted
between a directional valve and a
standard mounting surface.
Reduce Cost
SystemStak valves eliminate intervalve
piping and leak-prone tube and pipe
connections. Installed cost is less than
when using conventional valves.
Versatile and Easy to Install
SystemStak valves have all the internal
passages necessary to serve the
directional valve topping them. Mounting
surfaces and port patterns are to
international standards: any valve
conforming to ISO 4401 size 03;
ANSI/B93.7M size D03; NFPA-D03;
CETOP 3; and DIN 24340, NG6
mounting interface can be used with
these SystemStak valves.
Rugged and Reliable
Internal working parts are produced from
hardened steel and mounted in ductile
(spheroidal graphite) iron bodies.
Excellent reliability is ensured. Working
parts are accessible without removing
valves from an assembled stack.
SystemStak Systems... Easy to
Understand, Easy to Design
SystemStak circuitry is best shown
using slightly different symbols than
those for traditional valve configurations.
Each SystemStak symbol has the same
basic form and size as shown in fig. 1.
Figure 1
P
T
A
B
Figure 2
P
T
A
B
For ease of understanding, remember
the directions of flow for each line, and
that all four flow paths pass through
each valve (see fig. 2). For clarity,
directional valves are drawn vertically in
SystemStak circuit diagrams (see fig. 3).
Figure 3
P
T
A
B
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
(fig. 4 is an example).
Figure 4
P
T
A
B
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 are required, it is
recommended that the flow control valve
be between the check valve and the
actuator to prevent check valve chatter.
Figure 5
P
T
A
B
A combination of directional valve,
SystemStak valve(s) and
subplate/manifold block (fig. 5: single
station subplate and fig. 6: multi-station
manifold) completes the assembly.
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