Eaton SystemStak DGM 3 40 Series User manual

DGM**-3 40/41 Design ISO4401 Size 03;
ANSI/B93.7M-D03

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015M-2
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SystemStak™Valves
ISO 4401 Size 03
Build a Compact,
Cost-Effective, Reliable
Hydraulic System with Eaton
SystemStakTM 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.
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).
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).
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, SystemStak valve(s)
and subplate/manifold block
(fig. 5: single station subplate
and fig. 6: multi-station
manifold) completes
the assembly.
Figure 4
PTAB
Figure 5
P
T
BA
Figure 1
PT
Figure 2
P
TA
A
B
B
Figure 3
PTAB
Figure 6
P
T
BA
BA
P
T
AB AB AB
Figure 7
Figure 6
Figure 5
Figure 3
Figure 4
Figure 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.
Figure 1

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015 M-3
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Table of Contents
Function Basic symbol Basic model Features Page
Relief DGMC Single, dual and crossport 5
models
Counterbalance DGMR Control in port T 8
Sequence DGMR1 Single port P sequence 8
Reducing/relieving DGMX Piloted from (and reduced 8
pressure in) port P, A or B
Direct check DGMDC Single check in any port; dual 11
check in ports A and B only
Pilot operated check DGMPC Single in port A or B; dual 14
in ports A and B
Flow restrictor DGMFN Single or dual port, meter-in 17
or meter-out
Further information: 20
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

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015M-4
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Model Codes
SystemStak™Relief Valves
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
Eaton Industrial hydraulics manual.
Typical Section
DGMC-3-41
DGMC2-3-41
Type
2– Dual relief function
Omit for single relief
function
First function
Single relief, or first line of
dual models
Pressure adjustment
range, first function
A– 3-50 bar (45-725 psi)
B– 3-100 bar (45-1450 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
Second function
Second line of dual models
Pressure adjustment
range, second function
Options as in
Pressure adjustment/
locking method,second
function
Options as in
Gauge port: option
on AT and PT single
models only
B– G1⁄4”1⁄4 BSPF
S– SAE 4 (7⁄16“-20 UNF-2B)
Blank – No gauge
Design number,
41 series
Subject to change.
Installation dimensions
unchanged for design
numbers 40 to 49 inclusive.
5
1
2
3
4
6
7
8
9
3
4
DGMC(2) -3- ** - * * (-B* - * * )- * - 41
1 2 3 4 5 6 7 8 9
Pressure Discharge Usage
Code limited in into
BA B A Dual
with
AB
BT B T Dual
with
AT
Omit for single line models
Pressure Discharge Usage
Code 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

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015 M-5
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350
300
250
200
150
100
50
0
bar
50 600102030
4L
/min
04812 16 USgpm
0
1000
2000
3000
4000
5000
psi
Pressure
Flow rate
DGMC-3-PT-B* 41
DGMC-3-PT-A* 41
DGMC-3-PT-G* 41
DGMC-3-PT-C* 41
Pressure override Typical performance for PT models at max.
pressure settings with mineral oil at 21 cSt (102 SUS) and at
50ºC (122ºF).
Functional Symbols
For simplicity these two-stage valves are represented as
single-stage models
PTBA
DGMC-3-PT-41 DGMC2-3-AT-**-BT-41
PTBA
DGMC-3-BA-41
PTBA
DGMC2-3-AB-**-BA-41
PTBA
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 Approx. DGMC- 1.3kg (2.9lb)
DGMC2- 2.5kg (5.5lb)
Performance Data

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015M-6
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Installation Dimensions
in mm (inches)
DGMC(2)-3**-**(-B*-**)-41
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.
A
P
B
T
A
P
B
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)
Model A B C D
DGMC-3-AT-*W-41 – – 154 (6.1) –
DGMC-3-BT-*W-41 – – – 156 (6.2)
DGMC-3-AT-*W-*-41 – 160 (6.3) – –
DGMC-3-PT-*W-41 – – – 156 (6.2)
DGMC-3-PT-*W-*-41 – 160 (6.3) – –
DGMC2-3-AT-*W-BT-*W-41 234 (9.2) – – – For gage port thread options see model code 8

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015 M-7
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A
P
B
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.
Model E F G
DGMC-3-AB-*W-41 – – 164 (6.5)
DGMC-3-BA-*W-*-41 – 164 (6.5) –
DGMC2-3-AB-*W-BA-*W-41 234 (9.2) – –
Installation Dimensions
in mm (inches)

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015M-8
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DGMR(1)-3-40
DGMX*-3-40
General Description
These single-stage valves operate by the application of pres-
sure 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
SystemStak™
Pressure Controls: Counterbalance, Sequence
and Pressure Reducing Valves
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
Gauge port
B– G1⁄8 “ (1⁄8 BSPF)
S– SAE 4(7⁄16“-20 UNF-2B)
Design number, 40
series
Subject to change.
Installation dimensions
unchanged for design
numbers 40 to 49 inclusive.
DGM *(*) -3- ** (*) - * * - * - 40
4 5 61 2 73
1
2
7
6
5
3
4
Model Code

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015 M-9
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300
250
200
150
100
50
0
bar
50 6001020304 L/min
0481216 USgpm
0
1000
2000
3000
4000
psi
Pressure
Flow rate
DGMX1-3
DGMX2-3
DGMX3-3
462
0201
0
Reduced pressure lineReverse flow to T line
DGMX* 3 F
DGMX* 3 C
DGMX* 3 B
DGMX* 3 A
300
250
200
150
100
50
0
bar
50 6001020304 L/min
0481216 USgpm
0
1000
2000
3000
4000
psi
Pressure
Flow rate
DGMR1 3 F
DGMR1 3 C
DGMR1 3 B
DGMR1 3 A
Performance Data
Typical performance with mineral oil at 21 cSt (102 SUS) and at 50ºC (122ºF).
Operating Data
DGMX*-3-P* DGMR1-3-PP
PTBA
DGMR-3-TA
DGMR1-3-PP
DGMX*-3-PB
DGMX*-3-PP
PTBA
DGMX*-3-PA
PTBA
PTBA
PTBA
Maximum flow rate 60 L/min (16 USgpm)
Maximum operating pressure 315 bar (4500 psi)
Pressure drops See graphs
Mounting position Optional
Mass Approx. DGMR*- 1.3kg (2.9lb)
DGMX*- 1.3kg (2.9lb)
Functional Symbols

EATON DGM**-3 40/41 Design E-VLST-BB001-E April 2015M-10
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Installation Dimensions
in mm (inches)
Performance Data
(contd...)
0
bar
50 6001020304 L/min
0481216 USgpm
0
1000
psi
10
20
30
40
50
60
70
200
400
600
800
Reduced pressure settin
g
Q max.
DGMX*-3-P*
Low Pressure/Flow Rate Minimum Performance
Effect of Back-Pressure
The effective reduced
pressure is equal to the valve
adjustment setting plus any
back-pressure in line T
Dead Head Leakage
Typical leakage flow at 250
bar inlet pressure from
reduced pressure line into
T at “Dead Head” condition
(i.e. No flow required at the
reduced pressure outlet.)
This leakage flow must be
provided at the inlet line P in
order to maintain the reduced
outlet pressure.
DGMX1-3 = 1600
DGMX2-3 = 400
DGMX3-3 = 80
A
P
B
T
A
P
B
T
14 (0.55) max.
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)
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)
80 (3,1) max.
DGMR-3-TA-**-*-40
DGMR1-3-PP-**-*-40
DGMX(*)-3-P*(L)-**-*-40
Models with type W adjuster
To adjust valve setting slacken
off locknut and turn adjuster
screw.
Turn clockw to increase pressure;
counter-clockwise to decrease
pressure.
Re-tighten locknut after
completing adjustment.
DGMX2-3-**L models have
adjuster and end cap/gage port
locations interchanged from
positions shown.
For gage port thread options see model code ,
(pressure plug fitted)
6