20
DGMR Counterbalance Valves
General Description
Vickers SystemStak counterbalance
valves provide continuous protection from
pump cavitation and prevent an actuator
from running ahead of the pump supply.
These valves also provide thermal relief
protection in closed systems.
NOTE
Counterbalance valves adjust in the
opposite direction of other pressure
control valves. Turning the adjuster
counterclockwise increases the valve
setting. Turning the adjustment
clockwise lowers the pressure setting,
releasing the load.
Drain
Any pressure in the line to which these
valves are drained is additive to the
valve pressure setting.
Pilot pressure Calculation
To open the counterbalance valve by
remote control (referring to functional
symbols below):
For 4:1 ratio (typically for cylinder load
control), nominal pilot pressure at Port B =
Cracking pressure + (5 x Port A
1
pressure) – Port A pressure
4
For 10:1 ratio (typically for hydraulic motor
control), nominal pilot pressure at Port B =
Cracking pressure + (11x Port A
1
pressure) – Port A pressure
10
Functional Symbols
A
1
A
P
P
T
T
B
1
DGMR-5-A*-FW-B*-FW-30
B
A
1
A
P
P
T
T
B
DGMR-5-A*-FW-30
B
A
A
P
P
T
T
B
1
DGMR-5-B*-FW-30
B
3 45 87691 2
Model Code
1
2
Valve function
Manifold or subplate mounted
counterbalance valve.
Interface
5 - ISO 4401-AC-05-4-A, CETOP 5
RP35H, Size 5 ANSI/NFPA D05
Port operated upon
A -Counterbalance in A, piloted from B
B -Counterbalance in B, piloted from A
Pilot ratio
1 - 4:1
2 - 10:1
3
5
6
7
Pressure range
F -60 to 210 bar (900 to 3000 psi)
Adjustment device
H - Knob adjuster
C - Cap over screw
W - Screw with locknut
Port acted upon
(Omit for single type.)
B -Counterbalance in B, piloted from A
Pilot ratio
(Omit for single type.)
1 - 4:1
2 - 10:1
Pressure range
(Omit for single type.)
F -60 to 210 bar (900 to 3000 psi)
Adjustment device
(Omit for single type.)
H - Knob adjuster
C - Cap over screw
W - Screw with locknut
Design number - 30 series
Subject to change. Installation
dimensions unaltered for design
numbers 30 to 39 inclusive.
10
9
10 11
4
8
11
21
Operating Data
Basic Characteristics
Maximum operating pressure: 315 bar (4500 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maximum flow rate: 120 l/min (32 USgpm). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Load holding leakage @70% of pressure setting 0.35 ml/min.. . . . . . . . . . . . . . . . . . . .
Cracking Pressure Adjustment Range: 60-210 bar (900-3000 psi). . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pilot Ratios: 4:1, 10:1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leakage: 5 drops/min, Port A to Port A
1
at 70% of crack setting.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Temperature Range: -40 to 80 C (-40 to 180 F). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Weight: 4,5 kg (10 lbs). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DGMR Performance Curves
Pressure Drop bar
Pressure Drop psid
30
20
300
00
Flow l/min
Flow USgpm
20 40 60 80 100 120
51015202530
10
150
60
40
450
600
750
These curves show the typical pressure
drop for each flow path in the valve for
fluid viscosity range 21-32 cSt
(100-150 SSU).
The total insertion loss for the valve is
calculated by summing the losses through
each of the four flow paths.
50
4
3
Pressure Drop psid
4
0
Flow l/min
Flow USgpm
40 80
10 20
2
20
1
30
120
2
40
1 “P” port for all models.
“A” port of DGMR-5-B*-30
“B” port of DGMR-5-A*-30
2 “T” port for all models.
3 Free flow through service port
of counterbalance.
4 Piloted port open through
service port of counterbalance.
Insertion Losses
20 60 100
0
3
1
10
30
50
Pressure Drop bar
51525
22
Installation Dimensions
DGMR-5-A*-FW-B*-FW-30
Dual Counterbalance
on A & B Ports
60
(2.36)
65,6
(2.58)
“W” models
(max. ext.)
both ends
Wrench size
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
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.)
155,5
(6.12)
50
(1.97)
11,7
(0.46)
33,2
(1.31)
69,5
(2.74)
71,6
(2.82)
mm (inches)
T
A
B
P
A
21,5
(0.85)
13,5
(0.53)
3rd angle
projection
Hex key
4 (5/32”)
13 (1/2”)
Adjust counterclockwise to increase
pressure setting.
T
B
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.
23
DGMR-5-A*-FW-30
Counterbalance Port A,
Piloted from B
65,6
(2.58)
“W” models
(max. ext.)
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
4 mounting holes
(see page 22)
142,6 (5.61)
50
(1.97)
11,7
(0.46)
33,2
(1.31)
69,5
(2.74)
71,6
(2.82)
Hex key
mm (inches)
T
B
B
P
A
T
A
21,5
(0.85)
DGMR-5-B*-FW-30
Counterbalance Port B,
Piloted from A
60
(2.36)
Construction plug
(Do not remove)
65,6
(2.58)
“W” models
(max. ext.)
Wrench size
ISO 4401-AC-05-4-A (NFPA D05)
Mounting surface
142,6 (5.61)
11,7
(0.46)
33,2
(1.31)
69,5
(2.74)
71,6
(2.82)
Hex key
B
P
A
21,5
(0.85)
60
(2.36)
4 mounting holes
(see page 23)
Construction plug
(Do not remove)
Wrench size
13 (1/2”)
4 (5/32”)
4 (5/32”)
13 (1/2”)
Adjust counterclockwise to
increase pressure setting.
Adjust counterclockwise to
increase pressure setting.
37 (1.46)
T
B
T
A
See page 38 for interface dimensions.
See page 37 for optional adjustment devices.