2-Way Flow-Control Cartridge, Size 1
Q
max
= 5l/min,p
max
= 250bar
With fixed orifice,load compensated
Series MRPA-2-1…
1/3
Reference: 400-P-408101-EN-01
Issue: 05.2020
S Load-independent flow rate
S Compact design for cavity type GB – G¼“
to Bucher standards
S Various fixed orifices
(optimum integration in system)
S Exceptionally constant flow rate over the entire pres
sure range
S Very good reproducibility
S Can be used for LS-unloading
S Minimal wear and long service life
1 Description
Series MRPA… 2-way flow-control valves are size 1, high
performance, load-compensated screw-in cartridges with a
G ¼” mounting thread. By means of a fixed orifice, the flow
rate to an actuator is kept constant regardless of load
changes. The load compensation is done by the pressure-
compensator piston, which maintains the pressure drop
across the fixed orifice at a constant level. The flow-control
cartridges can be supplied with various fixed orifices for
optimum integration in the system. These 2-way flow-con
trol cartridges are used for meter-in or meter-out flow-con
trol circuits where flow rates must be kept constant regard
less of pressure changes.
2 Symbol
Simplified Detailed
2
1 1
2
3 Technical data
General characteristics Description, value, unit
Designation 2-way flow-control cartridge
Design with fixed orifice, load compensated
Mounting method screw-in cartridge G¼“
Tightening torque 15 Nm ± 10%
Size nominal size 1 mm, cavity type GB to Bucher standards
Weight 0.018 kg
Mounting attitude unrestricted
Ambient temperature range -25°C … +80°C
MTTF
D
values 150 years, see data sheet 400-P-010101-en
Hydraulic characteristics Description, value, unit
Maximum operating pressure 250bar
Maximum flow rate 5l/min
400-P-408101-EN-01/05.2020
Series MRPA-2-1…
2/3
Description, value, unitHydraulic characteristics
Hysteresis Nominal ± 10%
Nominal flow rate Q
N
is constant (fixed orifice): 5.0l/min ± 10%,
4.0l/min ± 10%,
2.5l/min ± 10%,
1.0l/min ± 10%
other flow rates - please consult BUCHER
Flow direction 2 → 1, see symbol / Note: 1 → 2 is not permitted!
Hydraulic fluid HL and HLP mineral oil to DIN 51 524;
for other fluids, please contact BUCHER
Hydraulic fluid temperature range -25°C … +80°C
Viscosity range 10…650mm
2
/s (cSt), recommended 15...250mm
2
/s (cSt)
Minimum fluid cleanliness
Cleanliness class to ISO 4406:1999
class 20/18/15
4 Performance graphs
measured with oil viscosity 33mm
2
/s (cSt)
P0296.ai
0
5
4
3
2
1
Q [l/min]
25020015010050
0 p [bar]
Q
N
5 l/min
Q
N
4 l/min
Q
N
2.5 l/min
Q
N
1 l/min
Q
N
0.3 l/min
Q = f (Δp) Flow-rate adjustment characteristic
5 Dimensions & sectional view
32
30 2
G1/4”
8
2
Ø 13.75
M
A
= 15 [Nm] ± 10 %
Ø 10.5
1
1)
IMPORTANT!
1)
The cutting edge guarantees leak-free sealing
(metal-to-metal) from port 2 to 1.
400-P-408101-EN-01/05.2020
Series MRPA-2-1…
3/3
6 Installation information
IMPORTANT!
When fitting the cartridges, use the specified
tightening torque. No adjustments are necessary,
since the cartridges are fitted with the required
fixed orifice in the factory.
ATTENTION!
Only qualified personnel with mechanical skills
may carry out any maintenance work. Generally,
the only work that should ever be undertaken is to
check, and possibly replace, the seals. When
changing seals, oil or grease the new seals tho
roughly before fitting them.
7 Ordering code
M = flow valve
R = flow-control valve
P = screw-in cartridge G¼“
A ... Q = standard model - see relevant data sheets
Z ... R = special features - please consult BUCHER
2 = 2-way model
1 = nominal size 1
nominal flow rate Q
N
is constant:
50 = 5,0l/min
40 = 4,0l/min
25 = 2,5l/min
10 = 1,0l/min
other flow rates - please consult BUCHER
2)
1 ... 9 = design stage (omit when ordering new units)
-
_
-
Ex.
A 50
-
2
-
PRM 1
IMPORTANT!
2)
With a nominal flow less than 1 l/min, the
variation and the hysteresis together can be
significantly above 10 %.
8 Related data sheets
Reference (Old no.) Description
400-P-040011 (i-32) The form-tool hire programme
400-P-040311 Cavity type GB to Bucher standards
400-P-010101 MTTF
D
values for hydraulic valves
E 2020 by Bucher Hydraulics AG Frutigen, CH-3714 Frutigen
www.bucherhydraulics.co
m
info.ch@bucherhydraulics.com
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 430.300.330.305.300