EATON Vickers Screw-In Cartridge Valves V-VLOV-MC001-E4 September, 2007 L-3
L
Reduces System Space
Requirements
Sandwich valves make
compact hydraulic systems
in which specific function
valves are “sandwich”
mounted between a
directional valve and a
standard mounting surface.
Reduce Cost
Sandwich valves eliminate
inter valve piping and
leak-prone tube and pipe
connections. Installed cost
is less than when using
conventional valves.
Versatile and Easy to
Install
Sandwich 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 Sandwich valves.
Linking and blanking plates
are available to facilitate a
variety of circuit designs
and flexibility in applying
these valves.
Rugged and Reliable
Cartridges are produced
from hardened steel and
mounted in aluminum
housings. Excellent
reliability is ensured.
Cartridges are accessible
without removing valves
from an assembled stack.
The housings are
assembled in a kit
containing a locating pin for
error free installation, all
necessary plugs and
standard Viton seals.
Sandwich Systems...
Easy to Understand, Easy
to Design
Sandwich circuitry is best
shown using slightly
different symbols than
those for traditional valve
configurations. Each
Sandwich symbol has the
same basic form and size
as shown in figure 1.
For ease of understanding,
remember the directions of
flow for each line, and that
all four flow paths pass
through each valve (see fig-
ure 2).
For clarity, directional valves
are drawn vertically in
Sandwich circuit diagrams
(see figure 3).
Each station (valve stack) is
a combination of functions.
When designing and
assembling Sandwich
valves, care must be taken
to ensure that they interact
as required by stacking the
functions in the correct
sequence (figure 4 is an
example).
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.
A combination of directional
valve, sandwich valve(s)
and subplate/manifold block
completes the assembly.
Sandwich Valve
Assemblies
Aluminum sandwich valve
assemblies consist of a
housing kit, and one or
more cartridges. They can
be purchased complete by
specifying a sandwich
model code or built by
mixing an appropriate
housing kit with cartridges
to attain a desired function.
A housing kit contains a
housing, locating pin, all
necessary plugs and
standard Viton seals.
Sandwich Valve Locators
Sandwich valve locators
group products by function
and provides an easy way
to identify a specific
sandwich valve in the
catalog.
It presents a sandwich
valve functional symbol,
function description and
basic model code. Since
every sandwich is put
together by inserting
cartridges into a housing
kit, the locator provides
concise information for
easy selection of the
components to build a
specific function.
The following information is
shown in the locator for
every function: Housing kit
model, part number,
catalog page with the
detailed information for the
housing kit, model code
and the catalog number for
the cartridges & cartridge
cavity.
Housing Kits Data Page
Housing kits data pages
L-25 thru L-44 provide the
dimensional data, typical
cartridges and functional
information.
Figure 3
F
igure 4
Sandwich Valves
B
uild a Compact, Cost
effective,Reliable Hydraulic
System with Vickers
aluminum Sandwich
Valves and SICV valves