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Counterbalance Valve

Poppet Type, Direct-Acting

Metric Cartridge – 420 bar

RSM12121

Up to 120 l/min

Up to 420 bar

The counterbalance valve RSM12121 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 12121 or separately to tank in cavity 12122)

z Option: Different versions of precision control of the lowering function

FUNCTION

SPECIFICATIONS*

Operating pressure: max. 420 bar

Nominal ow: max. 120 l/min

Check valve opening pressure 2 bar

Pressure setting range: 20 to 60 bar; for version φ=0 only

60 to 100 bar; for version φ=0 only

60 to 240 bar

240 to 420 bar

Operating pressure (at port 1): p = 0 - 350 bar,

max

= 420 bar (max. 80 % of the pressure setting)

Pressure at port 2 (pump / reservoir): 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 - 350 bar

Warning:

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 loss from 2 to 1: approx. 16 bar at 120 l/min

(check function)

Pressure loss from 1 to 2: dependent on ne control sleeve

(see curve)

Pilot ratio ϕ: 1:1, 2:1, 3:1, 5:1 (without pressure function)

Leakage: < 5 drops/min at max. pressure (leakage-free)

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 T1 + T2

Viscosity range: min. 2.8 mm²/s to max. 380 mm²/s

Filtration: Class 21/19/16 according to ISO 4406 or

cleaner

MTTF

: 150 years

Installation: Optional

Materials: Valve body: free-cutting steel

Piston: hardened and ground steel

Seals: NBR (Standard)

FPM (optional,

temperature range

-20 °C to +120 °C)

PTFE

Back-up rings: PTSM

Cavity: 12121 and 12122

Weight: 0.5 kg

ISO

* see "Conditions and instructions for valves" in brochure 53.000

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PERFORMANCE

Pressure dropPressure dropPressure drop Flow rate

Flow rate

Pilot pressure

measured at ν = 33 mm²/s, T

Öl

= 46 °C, ϕ = 3:1

Pressure relief curve:

Pressure at port 1 against ow rate from port 1 to 2, p

= 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)

0 5 10 15 20 25 30 35 gpm

0 20 40 60 80 100 120 140 l/min

100

150

200

250

300

350

400

bar

1000

2000

3000

4000

5000

psi

0 100 200 300 400 500 600 700 800 900 1000 1100 psi

0 10 20 30 40 50 60 70 80 bar

l/min

gpm

0 5 10 15 20 25 30 35 gpm

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 l/min

bar

100

150

200

250

300

psi

0 5 10 15 20 25 30 35

gpm

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

l/min

100

bar

250

500

750

1000

1250

psi

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.

M sleeve

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

0 = Version φ = 0 –

control independent of load pressure

(same ratio)

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

X = 120 l/min

Pressure range

60 = 20 to 60 bar (for version φ=0 only)

100 = 60 to 100 bar (for version φ=0 only)

240 = 60 to 240 bar

420 = 240 to 420 bar

Type of adjustment

V = adjustable by tool

F = xed setting

Pressure setting

Pressure in bar - Setting on request

CALCULATION OF CONTROL PRESSURE:

standard: p

ctrl

- p

+Kƒ×p

vented: p

ctrl

- p

ϕ ϕ

= Setting pressure

= Control pressure

= Load pressure

= Tank pressure

φ = Pilot ratio

K = Correction factor:

Kƒ (φ = 1) = 2

Kƒ (φ = 2) = 1.5

Kƒ (φ = 3) = 1.3

Kƒ (φ = 5) = 1.2

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HOUSINGS

R housing

R housing with drain

Cross port housing

Sandwich plate housing A-B

Standard models

Code Part No.

RSM12121-01-C-N-3-M240V 3499471

RSM12121-01-C-N-3-M420V 3499473

RSM12121E-01-C-N-3-M240V 3499472

RSM10121-01-C-N-0-H110V 3744913

RSM10121-01-C-N-0-M060V 3673315

RSM10121-01-C-N-0-M110V 3673328

RSM10121-01-C-N-0-S-060V 3885535

RSM10121E-01-C-N-0-H060V 3746788

RSM10121E-01-C-N-0-M060V 3673320

RSM10121E-01-C-N-0-M110V 3673387

RSM12121-01-C-N-0-M060V 3673455

RSM12121-01-C-N-0-M100V 3673473

RSM12121E-01-C-N-0-M060V 3673467

RSM12121E-01-C-N-0-M100V 3673601

RSM16121-01-C-N-0-M070V 3919385

RSM16121E-01-C-N-0-M070V 3919388

Other models on request

Standard inline bodies

1) Inline connection housing

Code Part No. Material Ports Pressure

FH-R12121-01-S B4/2 3130704 Steel, zinc-plated G3/4, G1/4 420 bar

With unload port:

FH-R12122-01-S B6/2 3736252 Steel, zinc-plated G3/4, G1/4 420 bar

2) Cross port housing (2 valves with two-way pilot control)

Designation Part No. Material Ports Pressure

FH-S12121-01-S B6 3736207 Steel, zinc-plated G3/4 420 bar

3) Sandwich plate housing acc. to ISO4401-05

Code Part No. Material Ports Pressure

FHWV-ZA/B12121-01-S C5 3795963 Steel, zinc-plated ISO 4401-05 420 bar

FHWV-ZB/A12121-01-S C5 3795965 Steel, zinc-plated ISO 4401-05 420 bar

FHWV-ZAB12121-01-S C5 3795967 Steel, zinc-plated ISO 4401-05 420 bar

FHWV-ZA/BT12122-01-S C5 3795970 Steel, zinc-plated ISO 4401-05 420 bar

FHWV-ZB/AT12122-01-S C5 3795972 Steel, zinc-plated ISO 4401-05 420 bar

FHWV-ZAB/T12122-01-S C5 3795974 Steel, zinc-plated ISO 4401-05 420 bar

Seal kits

Code Material Part No.

SEAL KIT 12121-NBR NBR 3269389

SEAL KIT 12121-FPM FPM 3269390

Additional housing on request

C1 C2

V1 V2

P T A B

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DIMENSIONS

RSM12121-01-V RSM12121-01-F

CAVITY

12121

Version E

12122

Form tools

Tool Part No.

Countersink MK4 177317

KK countersink 162128

Reamer MK2 175021

4 hex

SW4

SW13

SW30

Tightening torque

Ma = 100

+10

millimetre

subject to technical modications

millimetre

subject to technical modications

min. tting depth

min.

tting depth

FUNCTION PRINCIPLE

With the counterbalance valve RSM 12121, 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: +49 (0)68 97 /509-01

Fax: +49 (0)68 97 /509-598

Email: utec@hydac.com

Note

The information in this brochure relates to the

operating conditions and applications described.

For applications and / or operating conditions

not described, please contact the relevant

technical department.

Subject to technical modications.