Danfoss SystemStak DGM 5 Series Technical Information page 20

SystemStak™ Counterbalance Valves
DGMR
General Description
Danfoss 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.
Model Code
Valve function
1
Manifold or subplate mounted
counterbalance valve.
2 Interface
5 – ISO 4401-AC-05-4-A, CETOP 5
RP35H, Size 5 ANSI/NFPA D05
Port operated upon
3
A – Counterbalance in A, piloted from B
B – Counterbalance in B, piloted from A
Pilot ratio
4
1 – 4:1
2 – 10:1
Functional Symbols
DGMR-5-A*-FW-B*-FW -30
P T B
1
P T B
20
DGMR - 5 - * * - F * - B * - F * - 30
1
2 3
Pressure range
5
F – 60 to 210 bar (900 to 3000 psi)
Adjustment device
6
H – Knob adjuster
C – Cap over screw
W – Screw with locknut
Port acted upon
7
(Omit for single type.)
B – Counterbalance in B, piloted from A
8 Pilot ratio
(Omit for single type.)
1 – 4:1
2 – 10:1
DGMR-5-A*-FW-30
A P T
1
A P T
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
For 10:1 ratio (typically for hydraulic motor control),
nominal pilot pressure at Port B =
Cracking pressure + (11 x Port A
4 5 6 7 8 9
DGMR-5-B*-FW-30
B A
1
B A
pressure) – Port A pressure
1
4
pressure) – Port A pressure
1
10
10 11
Pressure range
9
(Omit for single type.)
F – 60 to 210 bar (900 to 3000 psi)
Adjustment device
10
(Omit for single type.)
H – Knob adjuster
C – Cap over screw
W – Screw with locknut
Design mumber - 30 series
11
Subject to change. Installation
dimensions unaltered for design
numbers 30 to 39 inclusive.
P T B
1
P T B
A
A