F-50
03 Series Modular Valves
■ Model Number Designation
Model Numbers
Graphic Symbols Graphic Symbols
MRP-03
MRA-03
MRB-03
Series Number
MRP: Reducing Valve for P-Line
MRA: Reducing Valve for A-Line
MRB: Reducing Valve for B-Line
MRP
A: ★-3.5
B: 1-7
C: 3.5-14
H: 7-31.5
Pres. Adj. Range
MPa
−B
03
Valve
Size
−03
70
Design
Number
−70
Pressure Drop
T-Line
A&B-Lines
0.5
0.4
0.3
0.2
0.1
0 20 40 60 80 100
120
Flow Rate L/min
MPa
P
Pressure Drop
Drain Flow Rate
900
800
700
600
500
400
300
200
100
0 5 10 15 20 25 30
35
Differential pressure MPa
(Primary pressure-Secondary pressure)
cm
3
/min
Drain Flow Rate
Pres. Drop at Spool Fully Open (P-Line)
1.5
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0 20 40 60 80 100 120
Flow Rate L/min
MPa
P
Pressure Drop
34
30
20
10
5
0
0 20 40 60 80
20 40 60 80 100
120
MPa
Secondary Pressure
Flow Rate L/min
Flow Rate L/min
MR＊-03-H
MR＊-03-H
MR＊-03-H
MR＊-03-C
MR＊-03-B
MR＊-03-B
MR＊-03-B
MR＊-03-A
MR＊-03-A
Secondary Pressure
MPa
Reducing Modular Valves
■ Instructions
The minimum adjustment pressure equals the value obtained from the minimum
adjustment pressure characteristics plus the tank line back pressure of this page.
This back pressure should include the value of the T-line pressure drop
characteristics of the valves stacked to the base plate side of the modular valve.
To make pressure adjustment, loosen the lock nut and turn the pressure
adjustment screw clockwise or anti clockwise. For an increase of pressure, turn
the screw clockwise. Be sure to re-tighten the lock nut firmly after making
adjustment to the pressure.
■ Specifications
Model Numbers
Max. Operating Pressure
MPa
Max.Flow
L/min
MR＊-03-A-70
★
35
80
MR＊-03-B/C/H-70 120
★If the pressure is set below 1.2 MPa, the maximum flow is limited.
See the "Min. Adjustment Pressure vs. Max. Flow" of this page.
★See the "Min. Adjustment Pressure vs. Max. Flow" of this page.
Min. Adjustment Pressure vs. Max. FlowNominal Override Characteristics
Primary Pressure 35 MPa
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0 20 40 60
80
Flow Rate L/min
MPa
Min. Adjustment Pressure
■ Typical Performance Characteristics
Hydraulic Fluid: Viscosity 35 mm²/s, Specific Gravity 0.850
F-51
MODULAR VALVES
F
03 Series Modular Valves
03 Series Modular Valves
■ List of Seals
MRP-03
MRB-03
MRA-03
MRP-03
MRA-03
MRB-03
MRP-03
For other dimensions, refer to “MRP-03” in the drawing abobe.
●MRA-03:The pressure adjustment part is assembled on the right side.
●MRB-03:The pressure adjustment part is assembled on the left side.
Note: If mounting surface dimension equipped with the valves based on ISO 4401-05-05-0-05,
pilot port of stacking valves will interfere with bolt hole of MRA-03, so check gasket
surface of the stacking valves.
Name of Parts
O-Ring
O-Ring
O-Ring
O-Ring
O-Ring
Part Numbers
AS568-014（NBR-90）
OR NBR-70-1 P6-N
OR NBR-90 P16-N
OR NBR-90 P18-N
OR NBR-90 P26-N
Qty.
5
1
1
1
1
Item
1
2
3
4
5
106
Rc1/4 Thd.
55
27.5
16.7
3.2
50.8
37.3
27
70
14
1246
54
Pressure Gauge Connection
Pressure Port “P”
6.6 Dia. Through 4 Places
Cylinder Port “B”
Pressure Adj. Screw
14 Hex. Soc.
Mounting Surface
(O-Rings Furnished)
Mounting
Surface
Fully Extended 232.5
Fully Extended 131.3
Tank Port “TB”
Tank Port “TA”
Cylinder Port “A”
Lock Nut
14 Hex. Soc.
20
2
32.5
6.4
21.4
INC.
45 32 1
Approx. Mass………3.8 kg
P
A
B
47.2 54
Mounting Surface
(O-Rings Furnished)
Mounting
Surface
(Note)
Rc1/4 Thd.
Pressure Gauge Connection
Pressure Adj. Screw
14 Hex. Soc.
Fully Extended 232.5
12
20
94
T
A
TB
INC.
Approx. Mass………3.8 kg
