Eaton VICKERS SystemStak User manual

ISO 4401-03; NFPA-D03; 315 bar (4500 psi); 60 L/min (15.7 USgpm)
GB 2027B
1
VICKERS®
SystemStak®Valves

Build a Compact, Cost-Effective, Reliable Hydraulic
System with Vickers SystemStaktValves
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
PTAB
Figure 2
PTAB
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
PTAB
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
PTAB
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
AB
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.
2

Fig. 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 off an unused station of a
multi-station manifold.
SystemStak Systems . . . Easy to Understand,
Easy to Design
Figure 6
P
T
AB AB
Figure 7
P
T
AB AB AB
3

Table of Contents
4
Function Basic symbol Basic model Features Page
Relief DGMC Single, dual and crossport
models 5
Counterbalance DGMR Control in port T 9
Sequence DGMR1 Single port P sequence 9
Reducing/relieving DGMX Piloted from (and reduced
pressure in) port P, A or B 9
Direct check DGMDC Single check in any port; dual
check in ports A and B only 13
Pilot operated check DGMPC Single in port A or B; dual in
ports A and B 16
Flow restrictor DGMFN Single or dual port, meter-in
or meter-out 19
Further information:
Mounting bolts, subplates and manifold blocks
Hydraulic fluids
Filtration requirements
Temperature limits
Pressure drop at other viscosities
Types H and K adjusters
Warranty and repair
Ordering procedure
22
Operating Data
Maximum flow rate 60 L/min (16 USgpm)
Maximum operating pressure 315 bar (4500 psi)
Pressure drops See graphs
Mounting position Optional
Mass, Approximate:
DGMC 1,3 kg (2.9 lb). . . . . . . . . . . . . . . .
DGMC2 2,5 kg (5.5 lb). . . . . . . . . . . . . . .
DGMR(1) 1,3 kg (2.9 lb). . . . . . . . . . . . . .
DGMX 1,3 kg (2.9 lb). . . . . . . . . . . . . . . .
DGMDC 1 kg (2.2 lb). . . . . . . . . . . . . . . . .
DGMPC 0,8 kg (1.8 lb). . . . . . . . . . . . . . .
DGMFN 1,1 kg (2.2 lb). . . . . . . . . . . . . . .

Relief Valves
DGMC-3-4*
DGMC2-3-4*
General Description
These two-stage adjustable pressure
relief valves limit the maximum pressure
in the line(s) controlled by the integral
relief valve elements.
Pressure adjustment options of control
knob (with or without keylock) or
screw/locknut design are available. The
two-stage operation is basically identical
to long-established balanced piston
valves, described in detail in Vickers
Industrial hydraulics manual.
Typical Section
FunctionalSymbols
For simplicity these two-stage valves are
represented as single-stage models
PTBA
DGMC-3-PT-**
DGMC2-3-AT-**-BT-**
DGMC-3-BA-**
DGMC2-3-AB-**-BA-**
PTBA
PTBA
PTBA
Model Code for Relief Valves
DGMC(2)-3- ** - * (-B* - * * )- * -4*
1 2
*
3 4 5 6 7 8 9
1Type
2 = Dual relief function
Omit for single relief function
First function
Single relief, or first line of dual models
Code Pressure Discharge Usage
limited in into
PT P T Single only
AB A B Single, or dual with BA
BA B A Single only
AT A T Single, or dual with BT
BT B T Single only
2
3
4
Pressure adjustment range, first
function
A = 3-50 bar (43.5-725 psi)
B = 3-100 bar (43.5-1450 psi)
C = 10-200 bar (145-2900 psi)
G = 50-315 bar (725-4500 psi)
Pressure adjustment/ locking
method, first function
H = Handknob
K = Micrometer with keylock
W = Screw and locknut
5

Pressure adjustment range,
second function
Options as in
Pressure adjustment/ locking
method, second function
Options as in
Gage port: option on AT and PT
single models only
B = G1/4I(1/4BSPF)
S = SAE 4 (7/16I-20 UNF-2B)
Blank = No gage port
Design number, 40 series
Subject to change. Installation
dimensions unchanged for design
numbers 40 to 49 inclusive.
7
6
8
9
Performance
Characteristics
Pressure override
Typical performance for PT models at
max. pressure settings with mineral oil at
21 cSt (102 SUS) and at 50_C (122_F).
350
300
250
200
150
100
50
0
bar
50 6040302010 L/min
0 4 8 12 16 USgpm
0
1000
2000
3000
4000
5000
psi
Pressure
Flow rate
3
4
Second function
Second line of dual models
Code Pressure Discharge Usage
limited in into
BA B A Dual with
AB
BT B T Dual with
AT
Omit for single line models
5
6
Relief Valves
DGMC-3-4*
DGMC2-3-4*

Installation Dimensions in mm (inches)
DGMC(2)-3**-**(-B*-**)-4*
Models with type W adjuster
To adjust valve setting slacken off locknut
and turn adjuster screw .
Turn clockwise to increase pressure;
counter-clockwise to decrease pressure
Re-tighten locknut after completing
adjustment.
For gage port thread options see model code
A
PB
T
A
PB
T
A max.
79 (3.1)
fully out
Line B or line P adjustment
(according to model type)
Line A adjustment
B max.
4 (0.16) max. over gage port plug
4 (5/32) A/F hex. socket
40
(1.57)
3,5 (0.14) Ø3 (0.12 dia)
20
(0.79)
47,6
(1.87) 46
(1.8)
39 (1.54)
76 (3)
C max.
D max.
4 off “O”seals supplied for this mounting face4 holes through: Ø5,3 (0.21 dia)
12,7 (1/2) A/F hex. locknut
Torque to 25-30 Nm (18-22 lbf ft)
8
Model A B C D
DGMC-3-AT-*W-4* ––154 (6.1) –
DGMC-3-BT-*W-4* –––156 (6.2)
DGMC-3-AT-*W-*-4* –160 (6.3) ––
DGMC-3-PT-*W-4* –––156 (6.2)
DGMC-3-PT-*W-*-4* –160 (6.3) ––
DGMC2-3-AT-*W-BT-*W-4* 234 (9.2) –––
7

Model E F G
DGMC-3-AB-*W-4* –– 164 (6.5)
DGMC-3-BA-*W-*-4* –164 (6.5) –
DGMC2-3-AB-*W-BA-*W-4* 234 (9.2) ––
A
PB
T
E max.
Line B adjustmentLine A adjustment
16,75 (0.66)
8 (0.13) max.
G max.
F max.
16,75 (0.66)
10 (0.4) max.
8
InstallationDimensions in mm (inches)

Pressure Controls: Counterbalance, Sequence and Pressure Reducing Valves
DGMR(1)-3-4*
DGMX*-3-4*
General Description
These single-stage valves operate by
the application of pressure on the end of
the valve spool, acting against a spring
which is loaded by means of the
adjustment mechanism.
In the counterbalance and sequence
valves the spool is offset by the spring
such that flow cannot pass through the
valve. When the force exerted by the
pilot pressure on the spool end exceeds
the force of the main spring, the spool is
moved to allow flow through the valve.
In the pressure reducing valve the flow
path is normally open and is closed as
the pilot pressure exceeds the setting of
the valve. Excessive pressure in the
reduced-pressure line is prevented by a
pressure relieving function.
Pressure adjustment options of control
knob (with or without keylock) or
screw/locknut design are available.
Typical Section
FunctionalSymbols
PTBA
DGMR-3-TA
DGMR1-3-PP
DGMX*-3-PA
DGMX*-3-PB
DGMX*-3-PP
PTBA
PTBA
PTBA
PTBA
9

Model Code for Counterbalance, Sequence and Pressure Reducing Valves
DGM *(*) -3- ** (*) * 4*
1
1
2
*
3 4 5 6 7
Type
R = Counterbalance function
R1 = Sequence function
X1 = Pressure reducing, underlapped
X2 = Pressure reducing, overlapped
X3 = Pressure reducing, overlapped,
low leakage
Function ports
For DGMR only:
TA = Counterbalance control function in
“T”port, controlled by pressure in
“A”port
For DGMR1 only:
PP = Sequence control in “P”port,
controlled by pressure in “P”port
For DGMX only:
PA = Pressure reducing function in line
P, piloted from A
PB = Pressure reducing function in line
P, piloted from B
PP = Pressure reducing function in line
P, piloted from P
Adjuster location
Option on DGMX only
L = Adjuster at “A”-port end of valve
Blank = Adjuster at “B”-port end of valve
Pressure adjustment range
For DGMX only:
Y = 1,40-7,0 bar (21-101 psi)
R = 1,40-45,0 bar (21-652 psi)
For DGMR and DGMX:
A = 3-30 bar (43.5-435 psi)
B = 3,5-70 bar (51-1000 psi)
C = 10-140 bar (145-2000 psi)
F = 20-250 bar (290-3625 psi)
Pressure adjustment/ locking
method
H = Handknob
K = Micrometer with keylock
W = Screw and locknut
2
3
4
5
--*-
6
7
Gage port
B=G
1/8I(1/8BSPF)
S = SAE 4 (7/16I-20 UNF-2B)
Design number, 40 series
Subject to change. Installation
dimensions unchanged for design
numbers 40 to 49 inclusive.
10