PRESSURE CONTROLS

Pressure Reducing and Relieving Valves
Pressure reducing and relieving valves are composite pressure control valves havingpressure reducing and counterbalancing functions developed for hydraulic balancing
circuits.

Relieving
FlowApprox.
Drain Flow
MassMax.
Operating
Pres.
MPa

Pres. Adj.
Range
MPa

Max. Flow

RBG−03−＊−10

140.6 - 13.550

50

0.6 - 1

4.2

RBG−06−＊−1025

0.8 - 24.5

125

125

1.5 - 211

Model Numbers

L/min

L/min

L/minkg■ Model Number DesignationRB

G−03−R−10Series Number

Type ofMounting

Valve Size

Drain TypeDesign NumberRB：
Pressure
Reducing andRelieving ValvesＧ：
Sub-plate
Mounting

None:
Internal Drain
Ｒ：ExternalDrain

0306

Graphic Symbols
Internal Drain

10

External Drain

Pressure Reducing and Relieving ValvesC■ Specifications■ Instructions● To use remote control relief valve in the venting circuit, see pageC-3. If the internal volume of the vent line is too large, chattering islikely to occur. Thus, as far as possible reduce the inside diameterand the length of the pipe.
● To adjust the pressure, loosen the lock nut and turn the pressureadjustment handle slowly clockwise for higher pressures and anticlockwise for lower pressures. After adjustments, do not forget totighten the lock nut.
● C onnect the tank pipe not to any other line but directly to thereservoir.

■ Sub-plates
Valve ModelNumbers
RBG−03
RBG−06

Vent Connection■ Accessories
Sub-plateModel Numbers

RBGM−03−10

RBGM−03X−10
RBGM−06−10
RBGM−06X−10

Thread Size
Rc
3／8
1／2
3／
41

Approx.
Mass kg
1.64.8● Mounting Bolts
Valve Model Numbers

Socket Head Cap Screw

RBG−03

M10×65L ……… 4 pcs.

RBG−06

M10×70L ……… 4 pcs.

● Sub-plates are available. Specify the sub-plate model number fromthe table above. When sub-plates are not used, the mounting surface
should have a good machined finish. (1.6 )Pressure Reducing and Relieving ValvesC-43

RBG−03
62
10

11.1

★ Pressure is limited by collars fitted. If a working
pressure cannot be attained, remove somecollars. One collar is equivalent to 10 MPa.

11 Dia. Through17.5 Dia. Spotface
4 Places
Two Collars★

66.7

89

Tank Port

42.9

Drain Port
Rc 1/4 Thd.
(Only for External Drain Type)

Lock Nut14 Hex.

15

Secondary Pressure Port73

Primary Pressure Port
Vent Port
Pressure Adj. Handle
Fully Extended 156

305052
Mounting Surface(O-Rings Furnished)

RBG−06

Tank Port115★ Pressure is limited by collars
fitted. If a working pressurecannot be attained, remove somecollars. One collar is equivalent to
10 MPa.

60.3

79.4

12.3

Fully Extended 74.4

Primary Pressure Port

Secondary Pressure Port

Drain Port
Pressure Adj. Handle
Two Collars★

Lock Nut
14 Hex.

Vent Port
Rc 3/8 Thd.

Mounting Surface(O-Rings Furnished)

C-44

Pressure Reducing and Relieving Valves

5756

139

116

44 Dia.

INC.

11 Dia. Through17.5 Dia. Spotface
4 Places

104217.5

97.5

75

95

44 Dia.

INC.

PRESSURE CONTROLS
Sub-plateRBGM−06＊

8

11 Dia. Through17.5 Dia. Spotface
4 Places

30.1

11.1

35.7

6.2 Dia. Through

61

140

116

79.4

39.7
20

15
21

6.2 Dia. Through

19

42.9

16

19.5

73

8.8 Dia. Through14 Dia. Spotface
4 Places

Rc 1/4 Thd.

E

Rc 1/4 Thd.

63.1

D

Connect Thd.
(See table below)
3 Places

A8B

C

Connect Thd.
(See table below)
3 Places

457.1

21.4

32

14 Dia. Through3 Places
M10 Thd. 20 Deep
4 Places

8.6

2290

23 Dia. Through3 Places

60.3

49.2

M10 Thd. 18 Deep
4 Places

7033.3

12633

7.9

58.7

66.7

150

121082

1.7

10Sub-plate
Model Numbers

Thread SizeRc
3／81／2

RBGM−03−10
RBGM−03X−10■ Nominal Override Characteristics

Sub-plateModel Numbers

ＡＢ

Ｃ

Ｄ

Ｅ

3／
4

20.7

65.7

95

37.1

89.1

20.4

69.7

98.4

32.5

93.8

RBGM−06−10
RBGM−06X−101

Hydraulic Fluid: Viscosity 35 mm²/s
Specific Gravity 0.850

Relieving
ReducingRBG-06

RBG-03
11.1
10.7
10.3

2120
197.6
7.2
6.8

Secondary Pressure

Secondary Pressure

Thread Size
RcC
Pressure Reducing and Relieving Valves

10212

RBGM−03＊

4.1
3.7
MPa 3.2
0.9
0.6
0.3

MPa
0102030
Flow Rate L/min

40

50

1716
15
1312
1198
75
4
3025

50
75
100
Flow Rate L/min

Pressure Reducing and Relieving Valves

125C-45

■ Min. Adj. Pressure & Vent Pressure

MPa

0.6

1.1

j.
Min. Ad

Pressure

Vent Pre

ssure

0.4

Min

0.9
0.8
0.5

MPa

0.4
Vent Pressure

0.3

0.20.2010203040
Flow Rate L/min

0.150

025 50 75 100 125
Flow Rate L/min■ Pressure DropP

RBG-03

0.4
0.3
0.2
0.1

0.4
0.3
0.2

MPa

010

RBG-06

0.5

Pressure Drop

Pressure DropP

Hydraulic Fluid: Viscosity 35 mm²/s
Specific Gravity 0.850

MPaureress

P
dj.

.A

1.0

RBG-03Pressure

Pressure

0.9
0.8

RBG-06

1.2

Hydraulic Fluid: Viscosity 35 mm²/s
Specific Gravity 0.850

203040Flow Rate L/min

0.1050● For any other viscosity, multiply the factors in the table right.

255075100Flow Rate L/min

Viscosity mm2/s 15● For any other specific gravity (G'), the pressure drop ( P') may
be obtained from the formula below.
⊿P'= ⊿P (G'/0.850)

Factor2030

401255060708090

1000.81 0.87 0.96 1.03 1.09 1.14 1.19 1.23 1.27 1.30

■ List of Seals
RBG−03
7 21 14 13 8 18 11 9 10 22 1219 23 6415

3521Item

Name of Parts

Part Numbers

Qty.

15O-Ring

OR NBR-90 P24-N

116O-Ring

OR NBR-90 P18-N

317O-Ring

OR NBR-90 P9-N

118O-Ring

OR NBR-70-1 P9-N

1Item

Name of Parts

Part Numbers

Qty.

17 16RBG−06★

10 11 16 19 17

18 5 14 4C-46

1

2 13 3 15 12 6

9 11 8811O-Ring

OR NBR-90 P9-N

212O-Ring

OR NBR-90 P24-N

113O-Ring

OR NBR-90 P28-N

314O-Ring

OR NBR-90 P30-N

1★ For details of pilot relief valves item ⑲, see page C-4,DG-01.

Pressure Reducing and Relieving Valves