E 5.933.1.0/01.13
276
Counterbalance Valve
Poppet Type, Direct-Acting
Metric Cartridge – 420 bar
RSM10121
1
2
3
Up to 60 l/min
Up to 420 bar
The counterbalance valve RSM10121 is
a direct-acting poppet valve. Its function
is to control the speed of a consumer
according to the inlet ow. It also prevents
the consumer from overrunning if there are
pulling loads and ensures smooth action in
consumers. In addition it fulls the function
of a hose-break valve.
FEATURES
z Primarily used in lift-lowering applications
z Low hysteresis over the entire pressure and ow range
z Consumer is held in position leakage-free
z Prevents overrunning of pulling loads
z Speed of consumer controlled in accordance with the inlet ow
z Hardened and ground valve components to ensure minimal wear and extend service life
z Low pressure drop due to CFD optimized ow path
z Acts as a hose-break valve to hold load if there is a leak in the control or feed line
z Restricts the load pressure to preset value (overload protection)
z Option: Model with control function which is independent of load pressure (version 0)
z Option: Model with control pressure which is independent of tank pressure (Version E can be
vented to atmosphere in cavity 10121 or separately to tank in cavity 10122)
z Option: Different versions of precision control of the lowering function
FUNCTION
SPECIFICATIONS
Operating pressure: max. 420 bar
Nominal ow: max. 60 l/min
Cracking pressure of check valve: 2 bar
Pressure setting range: 30 to 240 bar
240 to 420 bar
Load pressure (at port 1): p = 0 - 350 bar (Max. pressure adjust 420 bar)
Pressure at port 2 (pump / tank):
p = 0 - 350bar
Warning!
Pressures at port 2 are additive to the cracking
pressure! Solution: Vented version (E) of the valve
Control pressure (port 3): p = 0 - 420 bar
Tank pressure (port 4):
p = 0 - 30 bar
Note:
This port is only required if a vented version (E)
of the valve is used, and the trapped oil, which
collects in the spring chamber, is to be drained
separately via a 4th port to the tank (cavity 10122!)
Pressure drop from port 2 to 1: approx. 14 bar at 60 l/min
(check function)
Pressure drop from port 1 to 2: see curve
(dependent on ne control sleeve)
Pilot ratio ϕ: 1:1, 2:1, 3:1, 5:1, 10:1, 0 (without pressure relief
function)
Leakage: leak-free
(max. 5 drops ≙ 0,25 cm³/min at 350 bar)
Media operating temperature range: min. -30 °C to max. +100 °C
Ambient temperature range: min. -30 °C to max. +100 °C
Operating uid: Hydraulic oil to DIN 51524 Part 1 and 2
Viscosity range: min. 2.8 mm²/s to max. 380 mm²/s
Filtration: Class 21/19/16 according to ISO 4406 or
cleaner
MTTF
d
: 150 years (see "Conditions and instructions for
valves" in brochure 5.300)
Installation: No orientation restrictions
Materials: Valve body: Steel
Poppet: hardened and ground steel
Seals: NBR (standard)
FKM (optional, media
temperature range
-20 °C to +120 °C)
PTFE
Back-up rings: PTSM
Cavity: 10121 and 10122
Weight: 0.275 kg
E 5.933.1.0/01.13
277
MODEL CODE
RSM 10121 E - 01 - C - N - 3 - M 240 V 210
Basic model
Counterbalance valve
Metric
Cavity
Additional code
None = without venting
(standard)
E = Version E -
control pressure
independent of
tank pressure
Type
01 = standard
Body and ports*
C = cartridge only
Versions with bodies
on request
Seals
N = NBR (standard)
V = FKM (optional)
Pilot ratio ϕ
1 = 1 : 1
2 = 2 : 1
3 = 3 : 1
5 = 5 : 1
10 = 10 : 1
0 = Version 0 –
control independent of load pressure
Resolution (ne control due to sleeve)
(Q from 1 to 2 at max. control and ∆p = 30 bar)
H = 20 l/min
M = 40 l/min
L = 60 l/min
Pressure range
240 = 30 to 240 bar
420 = 240 to 420 bar
Type of adjustment
V = Allen head
F = xed setting, cannot be adjusted
Pressure setting
Pressure in bar
PERFORMANCE
Standard models
Model code Part No.
RSM10121-01-C-N-3-M240F 3487868
RSM10121-01-C-N-3-M240V 3435438
RSM10121E-01-C-N-3-M240V 3487816
Other models on request
*Standard in-line bodies
Code Part No. Material Ports Pressure
R10121-01X-01 395236 Steel, zinc-plated G1/2, G1/4 420 bar
Seal kits
Code Material Part No.
SEAL KIT RSM10121...NBR DE 3638115
SEAL KIT RSM10121...FKM DE 3638116
Pressure dropPressure dropPressure drop Flow rate
Flow rate
Flow rate
Flow rate
Control pressure
Measured at ν = 36 mm²/s,T
oil
= 46 °C, with sleeve, ϕ = 3:1
Pressure relief curve:
Pressure at port 1 against ow rate from port 1 to 2, p
3
= 0 bar
Pressure relief function protects the system in the event of overload on the consumer.
Control curve: (Pressure at port 3 against ow rate from port 1 to 2)
The control function shows the lowering speed against the control pressure.
Setting pressure: 200 bar; Load pressure: 25, 50, 85 % of set pressure
Throttle curve: ∆p-Q from port 2→1
The throttle curve shows the back-pressure against ow rate from port 2→1.
Throttle curve: ∆p-Q from port 1→2 maximum control
The throttle curve shows the back-pressure against ow rate from port 1→2.
(for different settings)
CALCULATION OF CONTROL PRESSURE:
standard: p
ctrl
=
p
e
- p
1
+Kƒ×p
2
vented: p
ctrl
=
p
e
- p
1
ϕ ϕ
p
e
= Setting pressure
p
st
= Control pressure
p
1
= Load pressure
p
2
= Tank pressure
φ = Pilot ratio
Kƒ (φ = 1) = 2
Kƒ (φ = 2) = 1.5
Kƒ (φ = 3) = 1.3
Kƒ (φ = 5) = 1.2
Kƒ (φ =10) = 1.1
0 2 4 6 8 10 12 14
gpm
0 5 10 15 20 25 30 35 40 45 50 55 60
l/min
0
50
100
150
200
250
300
350
400
bar
0
1000
2000
3000
4000
5000
psi
0 150 300 450 600 750 900 1050
psi
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80
bar
0
5
10
15
20
25
30
35
40
45
50
55
60
l/min
0
3
6
9
12
15
gpm
0 2 4 6 8 10 12 14
gpm
0 5 10 15 20 25 30 35 40 45 50 55 60
l/min
0
2
4
6
8
10
12
14
16
18
20
bar
0
50
100
150
200
250
psi
2 → 1
0 2 4 6 8 10 12 14
gpm
0 5 10 15 20 25 30 35 40 45 50 55 60
l/min
0
10
20
30
40
50
60
70
80
90
100
bar
0
250
500
750
1000
1250
psi
H
L
M
Important!
The differential pressure from port 1→2 on a fully controlled valve is dependent
on the resolution of the ne control sleeve.
When the resolution of the pilot function is higher, the back pressure increases.
E 5.933.1.0/01.13
278
DIMENSIONS
RSM10121-01-V RSM10121-01-F
CAVITY
10121
Version E
10122
Form tools
Tool Part No.
Countersink MK4 163910
Reamer MK2 163911
hex.
SW4
SW13
SW24
torque
M
a = 60
+5
Nm
millimeter
subject to technical modications
millimeter
subject to technical modications
tting depth
tting depth
min. tting depth
min. tting depth
min.
tting depth
FUNCTION PRINCIPLE
With the counterbalance valve RSM 10121, to raise a load, ow
is permitted from pump port 2 to consumer port 1 via the built-in
check valve.
To hold the load, the check valve piston is pressed against its
seat by the load pressure at port 1 and seals leakage-free (control
port 3 must be released of pressure!).
To lower the load, a combination of load- and control pressure is
applied to control port 3 which controls the valve. The higher the
load pressure, the lower the necessary control pressure. Flow is
now permitted from consumer port 1 to port 2. The load cannot
therefore overrun because the load ow rate is controlled at the
metering edge of the control piston according to the inlet pressure
of the consumer (control port 3 must be connected directly to the
cylinder – not externally).
An additional restriction of the load pressure is provided in that
the consumer pressure (load pressure) at port 1 acts on a control
piston within the valve and therefore against the force of the
adjustment spring. When the spring tension is exceeded, the
control piston moves away from the check valve piston, and this
opens the ow path from port 1 to port 2 – the resulting ow limits
the load pressure to the pre-set value.
HYDAC Fluidtechnik GmbH
Justus-von-Liebig-Str.
D-66280 Sulzbach/Saar
Tel: 0 68 97 /509-01
Fax: 0 68 97 /509-598
E-Mail: utec@hydac.com
Note
The information in this brochure relates to the
operating conditions and applications described.
For applications or operating conditions not
described, please contact the relevant
technical department.
Subject to technical modications.
E 5.933.1.0/01.13
279