EN 5.950.5.0/08.20
1
3-way pressure reducing/relieving valve
DRM10121-12
poppet type, direct-acting
Metric Cartridge – 450 bar
up to 25 l/min
up to 450 bar
PRODUCT ADVANTAGES
z Optimum control behaviour
z Low hysteresis
z High repeatability
z Very low leakage in seat-tight control position
z Compact design
z Adjusting range up to 320 bar
z Low oset for the pressure relief function
z Also available as a low-temperature version
z Exposed surfaces zinc-nickel plated for increased corrosion protection (1,000 h
salt spray test)
FUNCTION DESCRIPTION
The pressure reducing/relieving valve is a direct-acting 3-way poppet valve that reduces
an inlet pressure at port 1 (P) to a lower outlet pressure for the consumer at port 2 (A).
The level of the reduced pressure can be set at the valve.
When the pressure at the consumer reaches this pressure setting, the valve closes
leak-free at the control point which prevents leakage at the consumer.
If the consumer pressure increases above the set outlet pressure, the valve opens to
tank port 3 (T) and thus limits the pressure at the consumer.
Note:
The tank pressure adds to the set pressure.
The valve is primary pressure-dependent.
FUNCTION
EN 5.950.5.0/08.20
2
Millimetre (inch)
Subject to technical modications
DIMENSIONS
SPECIFICATIONS*
Operating pressure max. 450 bar (max. supply pressure at port 1)
Tank pressure max. 30 bar
Flow rate Pressure reducing function 1 → 2 max. 25 l/min
Pressure relief function 2 → 3 max. 5 l/min
Higher ow rates on request
Pressure setting range 10 to 70 bar
20 to 110 bar
20 to 250 bar
20 to 320 bar
Pressure oset See typical performance (dependent on control pressure)
Primary pressure dependence As primary pressure increases, the control pressure drops 8% ± 3% of the primary pressure change
Internal leakage Leakage-free,
Change in consumer pressure max. ± 2 bar in 10 seconds at consumer volumes of approx. 100 cm³
Media operating temperature range NBR: min. -30 °C to max. +100 °C
FKM: min. -20 °C to max. +120 °C
TT NBR: min. -40 °C to max. +80 °C (low temperature)
Ambient temperature range NBR: min. -30 °C to max. +100 °C
FKM: min. -20 °C to max. +100 °C
TT NBR: min. -40 °C to max. +80 °C (low temperature)
Operating uid Hydraulic oil to DIN 51524 Part 1, 2 and 3
Viscosity range min. 10 mm²/s to max. 420 mm²/s
Filtration (to ISO 4406) < 210 bar: min. 20/18/15
> 210 bar: min. 18/16/13
MTTF
d
150–1200 years, measurement according to DIN EN ISO 13849-1
Installation No orientation restrictions
Materials
Valve body Hardened steel
Piston Hardened and ground steel
Seals NBR (standard)
FKM
TT-NBR (-40 °C to +80 °C)
Back-up rings PTFE
Cavity 10121 metric
Weight 0.48 kg
* see “Conditions and Instructions for Valves” in brochure 53.000
Torque *
Torque
The valve must be adjusted by screwing in the
adjusting mechanism. To reduce the pressure setting,
the valve must be in a relieved state.
Adjustment C Adjustment CC
Adjustment H
Torque *
Torque *
Torque
*Torque:
Steel manifold (tensile strength > 360 N/mm²): 70 Nm
Aluminium manifold (tensile strength > 330 N/mm²): 50
Nm
(With torque tool in acc. with DIN EN ISO 6789, tool type
II class A or B)
For more information see “Conditions and Instructions for
Valves” in brochure 53.000
EN 5.950.5.0/08.20
3
CAVITY
10121
Millimetre (inch)
Subject to technical modications
Fit depth
Fit depth
MODEL CODE
DRM10121 - 12 - C - N - 250 - C - 250 - TT
Basic model
3-way pressure reducing/relieving valve, metric
Type
12 = spring chamber relief to tank (port 3)
Body and ports
C = cartridge only
Sealing material
N = NBR (standard)
V = FKM
Pressure ranges
070 = 10 to 70 bar
110 = 20 to 110 bar
250 = 20 to 250 bar
320 = 20 to 320 bar
Adjustment type
C = adjustable with tool, sealable (delivered without seal cap)
CC = preset, with mounted seal cap
H = with handwheel and locking via knurled nut
Pressure setting
No details = no pressure setting
250 = preset customer-specic pressure setting (specied in bar)
Low temperature
Not specied = not suitable for low temperatures
TT = suitable for low temperatures, with TT-NBR seal
VE = Visual examination
* Permitted drilling zone (for manifold design)
** Sharp edges should be avoided by
rounding to a radius of 0.1 mm to 0.2 mm
*** Largest pre-drilling diameter
(nominal tool diameter)
EN 5.950.5.0/08.20
4
TYPICAL PERFORMANCE
DRM10121-1.-C-.-320
Measured at ν = 33 mm²/s, T
oil
= 46 °C, p
1
= 400 bar
DRM10121-1.-C-.-250
Measured at ν = 33 mm²/s, T
oil
= 46 °C, p
1
= 350 bar
Relieving pressure
Reduced pressure
Relieving pressure
Reduced pressure
Flow Flow
DRM10121-1.-C-.-110
Measured at ν = 33 mm²/s, T
oil
= 46 °C, p
1
= 200 bar
DRM10121-1.-C-.-070
Measured at ν = 33 mm²/s, T
oil
= 46 °C, p
1
= 160 bar
Relieving pressure
Reduced pressure
Relieving pressure
Reduced pressure
Flow Flow
MATERIAL OVERVIEW
Standard models
Model code Part no.
DRM10121-12-C-N-070C 4255715
DRM10121-12-C-N-110C 4255564
DRM10121-12-C-N-250C 4179291
DRM10121-12-C-N-320C 4313908
Other versions on request
Spare parts seal kits
Code Material Part no.
DRM10121-NBR-TT TT-NBR (low temperature) 3676021
Other seal kits on request
Accessories, standard in-line bodies
Code Material Ports Pressure Part no.
H-R10121-SB4/2 Steel, zinc-plated G1/4", G1/2" 420 bar 395236
Other housings on request
Accessories, form tools for cavity
Tool Part no.
Countersink 163910
Reamer 163911
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 modications.
HYDAC Fluidtechnik GmbH
Justus-von-Liebig-Str.
66280 Sulzbach/Saar, Germany
Tel: 0 68 97 /509-01
Fax: 0 68 97 /509-598
E-mail: valves@hydac.com
