3
DGMC/DGMC2 Pilot Operated Relief Valves
General Description
These two-stage valves limit system
pressure by directing flow to tank or the
opposite cylinder port (A-B/B-A
crossport types) when system pressure
reaches the valve setting.
Pressure control may be obtained in “A”,
“B”, “A” and “B”, or “P” port, and pilot
flow may be internally or externally
drained, depending on model type.
Any pressure in the line to which these
valves are drained is additive to the
valve pressure setting.
The valve pressure setting is adjustable
by means of either an adjusting screw
and locknut, a hand-knob adjuster, or a
micrometer knob with keylock.
External remote control/vent
connections are available on all models
except crossport relief. If required on
crossport models, contact your
Vickers representative.
Pressure range
A - 4 to 50 bar (60 to 725 psi)
B - 4 to 100 bar (60 to 1450 psi)
F - 4 to 200 bar (60 to 2900 psi)
G - 4 to 315 bar (60 to 4500 psi)
Adjustment device
H - Knob adjuster
K - Micrometer knob with keylock
W - Screw with locknut
External drain
E - External drain
Omit for internal drain models.
P port acted upon
B -“B” cylinder port (dual or crossport type)
Omit for single type.
Port drained into
A -“A” cylinder port (crossport type only)
T -Tank port (dual type only)
Pressure range
Omit for single type.
A - 4 to 50 bar (60 to 725 psi)
B - 4 to 100 bar (60 to 1450 psi)
F - 4 to 200 bar (60 to 2900 psi)
G - 4 to 315 bar (60 to 4500 psi)
3 4 58769101 2 11 12 13 14 15 16
Model Code
1
2
Valve function
Manifold or subplate mounted pressure
relief valve.
Valve type
2 - Dual relief cavities
Blank - Single relief
Interface
5 - ISO 4401-AC-05-4-A, CETOP
RP35H ANSI/NFPA D05
5N - NFPA D05 (Alt. A)
5P - NFPA D05 (Alt. B)
Port operated upon
A -“A” cylinder port (single, dual or
crossport types)
B -“B” cylinder port (single type only)
P -Pressure port (single type only)
Port drained into
A -“A” cylinder port
B -“B” cylinder port (crossport type only)
T -Tank port (single or dual types)
3
4
5
6
7
8
9
10
12
13
Adjustment device
Omit for single relief models.
H - Knob adjuster
K - Micrometer knob with keylock
W - Screw with locknut
External drain
E - External drain same as position
Omit for single relief models.
Remote control port
RC - Remote control port
Not available on crossport models.
Gage port & thread type
Gage port for P-T models only;
optional remote control (RC) and
external drain (E) ports as applicable.
Omit for crossport models
B -G
1
/
8
” (
1
/
8
” BSPF)
S -SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread)
Design number - 30 series
Subject to change. Installation
dimensions unaltered for design
numbers 30 to 39 inclusive.
11
14
15
16
8
4
Functional Symbols
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5-AT-**-BT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5-AT-**-BT-**RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5-AT-**-E-BT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5-AT-**-E-BT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-AT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-AT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-PT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-PT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-PT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-PT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5-AB-**-BA-**-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-AT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-AT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-BT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-BT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-BT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5-BT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5-AB-**-E-BA-**-E-*-30
DR
DR
RC
DR
DR
RC
DR
RC
G
RC
G
DR
RC
DR
G
G
RC
RC
DR
RC
DR
RC
DR
RC
DR
DR
5
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5N-AT-**-BT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5N-AT-**-E-BT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5N-AT-**-E-BT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-AT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-AT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-PT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-PT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-PT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-PT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5N-AB-**-BA-**-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-AT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-AT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-BT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-BT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-BT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5N-BT-**-E-RC-*-30
Y
Y
X
X
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5N-AT-**-BT-**RC-*-30
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
RC
DR
DR
DR
DR
RC
RC
RC
RC
DR
DR
RC
DR
DR
DR
DR
G
G
G
G
RC
RC
RC
RC
6
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5P-AT-**-BT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5P-AT-**-E-BT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5P-AT-**-E-BT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-AT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-AT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-PT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-PT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-PT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-PT-**-E-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5P-AB-**-BA-**-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-AT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-AT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-BT-**-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-BT-**-RC-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-BT-**-E-*-30
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC-5P-BT-**-E-RC-*-30
Y
Y
X
X
P
P
T
B
T
B
T
A
T
A
B
B
A
A
DGMC2-5P-AT-**-BT-**-RC-*-30
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
Y
Y
X
X
DR
RC
RC
RC
RC
DR
DR
DR
DR
G
DR
DR
DR
RC
G
RC
G
DR
G
RC
DR
RC
7
Operating Data
Pressure Drop bar
Pressure Drop psi
15
10
5
200
150
100
50
00
Flow l/min
Flow USgpm
20 40 60 80 100 120
51015202530
DGMC-5 and DGMC2-5 Insertion Loss
Pressure bar
Pressure psi
20
15
10
250
200
150
100
00
Flow l/min
Flow USgpm
20 40 60 80 100 120
510 15202530
DGMC-5 and DGMC2-5 Vented Pressure
(RC models only)
(Not applicable for crossport models)
5
50
Pressure bar
Pressure psi
200
150
100
4000
3000
2000
0
0
Flow l/min
Flow USgpm
20 40 60 80 100 120
51015 202530
DGMC-5 and DGMC2-5 Pressure Override
50
1000
300
350
250
5000
1
2
3
G
F
B
A
The vented pressure chart (above) indicates flow from control
port to discharge port over relief element.
Basic Characteristics
Maximum flow: 120 l/min (32 USgpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pilot flow: @ 50 C (120 F) and 315 bar (4500 psi) 400–700 ml/min (24 in
3
/min-43 in
3
/min). . . . . . . . . . . . . .
Maximum operating pressure: 315 bar (4500 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Response time: For conditions of 5 liters (300 in
3
) of oil under
compression and a flow rate of 120 l/min (32 USgpm) typical response is: .
Pressure overshoot: 31 bar (450 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating temperature: -0 to 80 C (32 to 180 F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weights: DGMC 2,9 kg (6.5 lbs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DGMC2 3,6 kg (7.9 lbs)
The pressure override chart (below) shows typical
override of different adjustment ranges at maximum
settings.
Insertion Loss
Total change in pressure drop from through ports “P”
“B”, “A” and “T”caused by the addition of the
SystemStak valve to a hydraulic circuit. Insertion loss
curves (see top left):
1. DGMC2-5-AT-**-(E)-BT-**-(E)-(RC)*-30
DGMC-5-AT-**-(E)-(RC)*-30
DGMC-5-BT-**-(E)(RC)-*-30
2. DGMC-5-PT-**-(E)-(RC)*-30
3. DGMC2-5-AB-**-BA-**-30
Override at minimum (“P”) setting all models
Initial pressure Final pressure Response time
17 bar (250 psi)
35 bar (500 psi)
35 bar (500 psi)
35 bar (500 psi)
140 bar (2000 psi)
315 bar (4500 psi)
95 ms
110 ms
150 ms
8
Installation Dimensions
14 (0.55)
DGMC-5-PT Single Relief
50
(1.97)
25
(.98)
48
(1.89)
“W” models
(max. ext.)
Wrench size
13 (1/2”)
11,5
(0.45)
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
13,5 (0.53)
4 mounting holes
∅ 6,90 (0.27) through
∅ 9,50 (0.37) counterbore
36,5 (1.44) deep for bolt extenders (order separately)
BKE-6M-50M (M6 metric) or BKE-4-50M (.2500-20 UNC).
Torque: 11,3-14,7 Nm
(100-130 lb. in.)
144,1 (5.67) max.
23
(0.91)
50
(1.97)
11,7
(0.46)
33,2
(1.31)
69,5
(2.74)
71,6
(2.82)
max.
38
(1.5)
11,8
(0.46)
1,8
(0.46)
Adjust clockwise to increase pressure
setting.
Note: Back pressure in drain is added to this
setting for internal drain models only.
External drain port. External
connection port thread (see table)
External drain port.
Plugged for internal drain.
External connection port
thread type (see table)
Remote control port.
(“RC” models only)
External connection port
thread type (see table)
Hex key
4 (5/32”)
Gage port. External connection
port thread type: (see table)
T
B
B
P
A
T
A
mm (inches)
“S” models - SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread).
“B” models - G
1
/
8
(
1
/
8
BSPF)
External connection port threads
3rd angle
projection
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.
9
ISO 4401-AC-05-4-A (NFPA D05) Mounting surface
4 mounting holes
(See page 8 for
specifications)
Adjust pressure “A” port. Adjust clockwise to increase pressure setting.
DGMC-5-BT Single Relief
50
(1.97)
30
(1.18)
48 (1.89)
“W” models
(max. ext.)
Wrench size
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
13,5 (0.53)
141 (5.55)
37 (1.46)11,7 (0.46)
33,2
(1.31)
69,5
(2.74)
71,6
(2.82)
max.
Adjust pressure “B” port. Adjust clockwise to increase pressure setting.
External drain port *
Plugged for internal drain.
Remote control port. *
(“RC” models only)
Hex key
T
A
B
P
A
T
B
Back pressure in drain is added to this
setting for internal drain models only.
11,5
(0.45)
15,3
(0.60)
11,5
(0.45)
12,5 (0.49)
50
(1.97)
30
(1.18)
48 (1.89)
“W” models
(max. ext.)
Wrench size
13,5 (0.53)
4 mounting holes
(See page 8 for specifications)
141 (5.55)
50 (1.97)
11,7 (0.46)
33,2
(1.31)
69,5
(2.74)
71,6
(2.82)
max.
External drain port *
Remote control port *
(“RC” models only)
Hex key
T
B
B
P
A
T
A
11,5
(0.45)
11,5
(0.45)
12,5
(0.49)
DGMC-5-AT Single Relief
External drain port *. Plugged for internal drain.
mm (inches)
4 (5/32”)
13 (1/2”)
13 (1/2”)
4 (5/32”)
15,3 (0.60)
* External connection port thread type:
“S” models - SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread).
“B” models - G
1
/
8
(
1
/
8
BSPF)
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.
10
* Remote control port. Both ends
(“RC” models only)
DGMC2-5-AT-**-BT-**-30
Dual Relief
50
(1.97)
30
(1.18)
48
(1.89)
“W” models
(max. ext.)
typ. both ends
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
13,5
(0.53)
153,9 (6.06)
50
(1.97)
11,7
(0.46)
33,2
(1.31)
71,6
(2.82)
max.
Adjust pressure “B” port. Adjust
clockwise to increase pressure setting.
* External connection port thread type:
“S” models - SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread).
“B” models - G
1
/
8
(
1
/
8
BSPF)
T
A
B
P
A
T
B
Back pressure in drain is added to this
setting for internal drain models only.
Wrench size both ends
33,2
(1.31)
69,5
(2.74)
15,3
(0.60)
both
ends
11,5
(0.45)
both
ends
both
ends
12,5 (0.49)
both ends
Hex key
External drain port *
(both ends).
Plugged for internal drain.
Adjust pressure “A” port. Adjust
clockwise to increase pressure
setting.
mm (inches)
13 (1/2”)
4 (5/32”)
4 mounting holes
∅ 6,9 (0.27) through
∅ 9,50 (0.37) counterbore
36,5 (1.44) deep
for bolt extenders
(order separately)
BKE-6M-50M (M6 metric) or
BKE-4-50M (.2500-20 UNC).
Torque: 11,3-14,7 Nm
(100-130 lb. in.)
* Remote control port. Both ends
(“RC” models only)
15
in model code
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.
11
DGMC2-5-AB-**-BA-**-30
Dual Crossport Relief
60
(2.36)
20
(0.79)
45,6
(1.71)
“W” models
(max. ext.)
typ. both ends
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
14,0 (0.55)
128 (5.04)
37
(1.46)
11,7
(0.46)
31,3
(1.23)
71,6
(2.82)
max.
Adjust pressure “A” port. Adjust
clockwise to increase pressure setting.
T
A
B
P
A
T
B
Wrench size
both ends
69,5
(2.74)
Hex key
Adjust pressure “B” port. Adjust
clockwise to increase pressure setting.
mm (inches)
40
(1.57)
4 mounting holes
∅ 6,90 (0.27) through.
∅ 9,50 (0.37) counterbore
46,5 (1.83) deep
for bolt extenders
(order separately)
BKE-6M-60M (M6 metric) or
BKE-4-60M (.2500-20 UNC).
Torque: 11,3-14,7 Nm
(100-130 lb. in.)
13 (1/2”)
4 (5/32”)
“S” models - SAE-4 O-ring boss port
(0.4375-20 UNF-2B thread).
“B” models - G
1
/
8
(
1
/
8
BSPF)
External drain port threads
46
(1.81)
External drain (See table)
External drain (See table)
BA
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.
12
DGMC-5-AB-**-(E)-*-30
Single Crossport Relief
60
(2.36)
20
(0.79)
45,6
(1.71)
“W” models
(max. ext.)
mm (inches)
40
(1.57)
DGMC-5-BA-**-(E)-*-30
Single Crossport Relief
60
(2.36)
40
(1.57)
45,6
(1.71)
“W” models
(max. ext.)
mm (inches)
40
(1.57)
BA
BA
10,2 (0.40)
10,2 (0.40)
128 (5.04)
128 (5.04)
4 mounting holes
(See above for
specifications)
4 mounting holes
∅ 6,90 (0.27) through.
∅ 9,50 (0.37) counterbore
46,5 (1.83) deep
for bolt extenders
(order separately)
BKE-6M-60M (M6 metric) or
BKE-4-60M (.2500-20 UNC).
Torque: 11,3-14,7 Nm
(100-130 lb. in.)
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
Click here for interface dimensions.
Click here for optional adjustment devices.
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.
