EN 5.933.3.1/01.22
1
Counter Balance Valve
Poppet Type, Direct Acting
Metric Cartridge – 350 bar
RSM16121-01
Up to 240 l/min
Up to 350 bar
The counter balance valve is a direct
acting poppet valve. It has to control the
lowering speed according to the supply
ow rate. It also prevents the consumer
from hurrying on ahead when there
are pulling loads and allows a jerk-free
movement of the same. It also carries
out the function of a hose-break valve.
For details about the functionality,
see page 3.
FEATURES
z Main application for lift-lowering applications
z Leakage-free holding of the load
z Avoidance of leading pulling loads
z Actuator speed regulation corresponding to the supply ow rate
z Hose break valve for holding the load when the control or meter-in port breaks
z Limiting the load pressure to a set value (overload protection)
z Option: Variant with load-pressure-independent pilot function (version 0)
z Optional: Variant with pilot pressure independent of the tank pressure (Version E can be relieved
to the atmosphere or in the special installation space 16122 separately from the tank)
z Optional: Dierent versions of precision control of the lowering function.
z External surfaces with advanced corrosion protection due to Zn-Ni coating
(1,000 h salt spray test)
FUNCTION
SPECIFICATIONS
Operating pressure: max. 350 bar
Flow rate: max. 240 l/min
Cracking pressure of check valve: 2 bar (from port 2 to port 1)
Pressure setting range: 120 to 240 bar
240 to 420 bar
(max. 20 % over the expected max.
occurring pressure in the application)
Operating pressure (at port 1): p = 0 - 350 bar
(max. 80 % of setting pressure)
Pressure at port 2
(Pump/Tank):
p = 0 - 350bar
Notice:
Pressures at port 2 increase the
pilot and setting pressure. Solution: Vented version
(E) of the valve
Control pressure (port 3): p = 0 - 350 bar
Tank pressure (port 4): p = 0 - 350 bar
Notice:
This port is only required when the vented version
(E) of the valve is used and the trapped oil, which
collects in the spring chamber, is to be drained away
via a fourth port separate to the tank (cavity 16121)
Pressure loss from 2 to 1: approx. 20 bar at 240 l/min (check function)
Pressure loss from 1 to 2: Dependent on control sleeve – see performance
curves
Pilot ratio φ: 1:1, 2:1, 3:1, 5:1, 0
(0 = without pressure relief function)
Leakage: Leakage-free
max. 5 drops/min (0.25 cm³/min) at 350 bar
Media operating temperature range: min. -20 °C to max. +100 °C
Ambient temperature range: min. -20 °C to max. +100 °C
Operating uid: Hydraulic oil according to DIN 51524 Part 1, 2 and 3
Viscosity range: min. 2.8 mm²/s to max. 380 mm²/s
Filtration: Permitted operating uid contamination level
according to ISO 4406 Class 18/16/13 or better
Installation: No orientation restrictions
Materials: Valve body: Steel
Piston: Hardened and ground steel
Seals: NBR (standard)
FKM (optional,
temperature range of operating
uid -20 °C to +120 °C)
Back-up rings: PTFE
Cavity: 16121 and 16122
Weight: 0.9 kg
* See “Conditions and Instructions for Valves” in brochure 53.000
EN 5.933.3.1/01.22
2
MODEL CODE
RSM 16121 E - 01 - C - N - 1 - M 240 V 210
Basic model
Counterbalance valve
metric
Cavity
16121 = 3 Ports
16122 = venting to the tank
through the 4th port
Additional code
w/o = without venting
(standard)
E = Version E -
Control pressure
independent of
tank pressure
Type
01 = standard
Body and ports*
C =
Cartridge only
Versions with bodies, see chart
Sealing material
N = NBR (standard)
V = FKM
Pilot ratio ϕ
1 = 1 : 1
2 = 2 : 1
3 = 3 : 1
5 = 5 : 1
0 = Version 0 - see functional principles
load pressure-independent control
Resolution (ne control by sleeve)
(Q from 1 to 2 at max. control and ∆p = 30 bar)
H = 50 l/min
M = 100 l/min
L = 150 l/min
X = 200 l/min
Pressure range
with pilot ratio φ = 1, 2, 3 and 5
240 = 120 to 240 bar
420 = 240 to 420 bar
with pilot ratio φ = 0
60 = 27 to 60 bar
100 = 60 to 100 bar
Type of adjustment
V = adjustable by tool
F = xing setting, non-adjustable
Pressure setting
Pressure in bar - Setting on request
STANDARD MODELS
Model code Part no.
RSM16121-01-C-N-1-M240V 3673605
RSM16121-01-C-N-3-M240V 3526165
RSM16121E-01-C-N-1-M240V 3673607
RSM16121E-01-C-N-3-M240V 3673606
Other versions on request
BODIES
1) In-line bodies*
Code Part no. Material Port Pressure
R16121-01X-01 3736272 Steel, zinc-plated G1", G1/4" 350 bar
With venting port:
R16122-01X-01 3736389 Steel, zinc-plated G1", G1/4" 350 bar
2) Cross port housing
(2 valves with two-way pilot control)
Code Part no. Material Port Pressure
H-S16221-SB8 3736200 Steel, zinc-plated G1" 350 bar
SEAL KITS
Code Material Part no.
on request
CALCULATION OF CONTROL PRESSURE:
standard: p
st
=
p
e
- p
1
+Kƒ×p
2
vented: p
st
=
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
p
e
≥ 1.2 × p
1
Flow rate
Flow rate
Throttle curve: ∆p-Q from 2→1
The throttle curve shows the back pressure on the ow rate from port 2→1.
Throttle curve: ∆p-Q from port 1→2 maximum pilot control
The throttle curve shows the back pressure on the ow rate from port 1→2.
(for dierent ne control sleeves)
0 10 20 30 40 50 60 70
gpm
0 20 40 60 80 100 120 140 160 180 200 220 240
l/min
0
3
6
9
12
15
18
21
24
bar
0
50
100
150
200
250
300
psi
0 10 20 30 40 50 60 70
gpm
0 20 40 60 80 100 120 140 160 180 200 220 240
l/min
0
10
20
30
40
50
60
70
80
90
100
bar
0
250
500
750
1000
1250
psi
H
L
M
X
Important!
The dierential pressure from port 1 to 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.
Pressure dropPressure drop
TYPICAL PERFORMACE
Measured at ν = 33 mm²/s, T
oil
= 46 °C, φ = 3:1
EN 5.933.3.1/01.22
3
TYPICAL PERFORMACE
Measured at ν = 33 mm²/s, T
oil
= 46 °C, φ = 3:1
Overload curve:
Pressure at 1 via volume ow from 1 to 2, p
st
= 0 bar
Overload protection of the system through volume ow-dependent pressure
limitation at port 1.
Pilot curve: (ow from 1 to 2 via pilot pressure to 3)
The pilot function shows the lowering speed on the pilot control pressure. Setting
pressure: 200 bar; Load pressure: 25, 50, 85% of set pressure
Flow rate
Pilot control pressure
0 10 20 30 40 50 60 70
gpm
0 40 80 120 160 200 240
l/min
0
50
100
150
200
250
300
350
400
bar
0
1000
2000
3000
4000
5000
psi
0 120 240 360 480 600 720 840 960 1080 1200 1320 1440
psi
0 10 20 30 40 50 60 70 80 90 100
bar
0
20
40
60
80
100
120
140
160
180
200
220
240
l/min
0
8
16
24
32
40
48
56
gpm
Pressure dropFlow rate
M sleeve
M sleeve
DIMENSIONS
RSM16121-01-V RSM16121-01-F
Int. hex.
SW4 ¹
SW13
SW36
Tightening torque²
Millimetre
Subject to technical modications
CONTINUATION OF FUNCTION PRINCIPLE
With the counterbalance valve, to raise a load, ow is permitted
from pump connection 2 to consumer port 1 via the built-in check
valve.
To hold the load, the check valve is pressed against its seat by
the load pressure at port 1 and seals leakage-free (pilot port 3
must be released of pressure).
To lower the load, pressure is applied to pilot port 3 which
controls the valve. Flow is now permitted from consumer port 1
to port 2. A speedingahead of the load is prevented because the
ow rate is controlled at the metering edge of the control piston
according to the inlet pressure of the load.
An additional relief function of the load pressure is provided in
that the actuator 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 in
case of overload, the control piston moves away from the check
valve piston, and this opens the ow path from port 1 to 2 – the
resulting ow limits the load pressure to the pre-set value. For the
version without venting, a pressure at port 2 is added to the set
value.
Version 0 with load pressure-independent pilot control:
Only the amount of pilot pressure at port 3 determines the
opening area of port 1 to port 2. Here the valve opens as soon
as the pilot control pressure exceeds the set pressure. The valve
does not have a pressure relief function for the consumer-side
pressure protection at port 1. There is free ow through the valve
via the check function from port 2 to port 1.
¹ Clockwise rotation increases the setting
pressure
² Tightening torque:
Steel manifold
(ultimate tensile strength > 360 N/mm²):
150 Nm
Aluminium manifold
(ultimate tensile strength > 330 N/mm²):
110 Nm
(With torque tool according to DIN EN
ISO 6789, tool type II class A or B)
For further information see brochure
No. 53.000 "Conditions and instructions
for valves"
EN 5.933.3.1/01.22
4
CAVITY
16121
Version E
16122
Form tools
Tool Part no.
on request
Millimetre
Subject to technical modications
Fitting depth
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: valves@hydac.com
Note
The information in this brochure relates to
the operating conditions and applications
described. For applications not described,
please contact the relevant technical
department.
Subject to technical modications.
Fitting depth
Fitting depth
Fitting depth
Fitting depth
VE = visual examination
* Permitted boring zone (for manifold design)
** Sharp edges should be avoided using a radius of
0.1 mm to 0.2 mm
*** Largest pre-drilling diameter
(nominal tool diameter)
