Pilot Operated Relief Valves
■
Pilot Operated Relief Valves
These valves protect the hydraulic system from excessive
pressure, and can be used to maintain constant pressure in
a hydraulic system.
Remote control and unloading are permitted by vent circuits.
■ Specifications
■ Model Number Designation
* Refer to the Minimum adjustment Pressure characteristics on Page 273.
Use high venting pressure type to reduce the response time from unload to onload.
Vent Connection
Graphic Symbol
Model Number
Max. Operating
Pressure
Kgf/cm
2
Pres. Adj.
Range
Kgf/cm
2
Max. Flow
L/min.
Mass Kg.
Threaded
Connection
Sub-plate
Mounting
BT type BG type
-
BG-03- -32
250
* ~ 250
100 - 4.7
BT-06- -3280 BG-06- -32
200 5 5.6
-
BG-10- -32
400 - 8.7
F- B T -03 P -V -32
Special Seal Series Number
Type of
Mounting
Valve
Size
Plunger
Type
High Venting
Pres. Feature
Design
Number
Design
Standards
F:
Special Seals
for Phosphate
Ester type
Fluids.
(omit if not
required)
B:
Pilot Operated
Relief Valves
T:
Threaded
Connections
06
P:
Pull Type
V:
For High
Venting
Pressure
Feature
(Omit if not
required)
32 80
G:
Sub-plate
Mounting
03 32
06 32
10 32
PRESSURE CONTROLS
EIC-C-1002-0
Pilot Operated Relief Valves
269
C
Pilot Operated Relief Valves
■ Instructions
If a remote control relief valve is used in the vent circuit, see page 253 in EIC-C-1001-0. In addition, if the
internal volume of the vent line is too large, chattering is likely to occur. Thus, as far as possible reduce
the inside Dia. and the length of the pipe.
To adjust the pressure, loosen the lock nut and turn the handle slowly clockwise for higher pressure or
anti-clockwise for lower pressures. After adjustments, do not forget to tighten the lock nut.
Pressure is limited by collars fitted. If a working pressure cannot be attained, remove some collars.
One collar is equivalent to 100 Kgf/cm
2
.
Piping of the Tank line should not be connected to any tank line of the other valves, but connected
directly to the reservoir.
With a small flow, the setting pressure may be unstable. Use models numbered 03 and 06 with a
flow rate 8 L/min. and model 10 with 15 L/min.
There are two threaded connection pressure ports. They can be connected each other in-line one
as inlet and the other as an outlet or the valve can be used by plugging one of the pressure ports.
■ Attachment
Mounting Bolts
■ Sub-Plate
Sub-plates are available. Specify sub-plate model from the table above. When sub-plates are not used, the mounting
surface should have a good machined finish.
Valve
Model Number
Socket Head Cap Screw
Qty
Nos.
Bolt Kit
Ordering Code
BG-03 M12 x 70Lg., M12 x 95Lg. 2 each BK BG-03-10
BG-06 M16 x 60Lg., M16 x 80Lg. 2 each BK BG-06-10
BG-10 M20 x 70Lg., M20 x 90Lg. 2 each BK BG-10-10
Valve
Model Number
Sub-plate
Model Number
Piping
Size
Mass
Kg.
BG-03
BGM-03-3080 3/8 BSP.F 2.4
BGM-03X-3080 1/2 BSP.F 3.1
BG-06
BGM-06-3080 3/4 BSP.F 4.7
BGM-06X-3080 1 BSP.F 5.7
BG-10
BGM-10-3080 1-1/4 BSP.F 8.4
BGM-10X-3080 1-1/2 BSP.F 10.3
PRESSURE CONTROLS
270
Model Number “Q” Thd. “S” Thd. “T” Thd.
BT-06P- -3280
3/4 BSP.F 3/8 BSP.F 1/4 BSP. Tr
Mounti ng Sur fa ce
BG - 03 : I SO 626 4 AR- 06- 2-A
BG -0 6 : I SO 62 64 AS- 0 8- 2 -A
BG - 10 : ISO 626 4 A T -1 0-2 -A
Model
Number
G H J K L N
BT-06 68.5 62 36 52 90 45
Model
Number
A B C D E F
BT-06 75 40 105 52 78 150.5
Pilot Operated Relief Valves
B
C
G
6
D
E
F
Locating Pin
6 Dia.
45 Dia.
Pressure Adjustment Handle
(Selectable in Other 2 Position)
"A" SQ.
Mounting Surface
(O-Ring Furnished)
Lock Nut 14 Hex.
Two Collars
H
J
K
N
P
L
In case of BG-03,
no spotface are
made at those two
holes.
"Q" Dia. x Thru.
"S" Dia. Spotface
4 Places
Pressure Port
Tank Port
Pressure Gauge
Connection
1
4
BSP.T Thd.
Vent Port
Fully Extended
DIMENSIONS IN
MILLIMETRES
03
10
BT-06P- -3280
BG-06 P- 32
Model
Number
H J K L
BG-03 14.1 41 82 117
BG-06 17 52 104 141
BG-10 20.7 62 124 175
Model
Number
N P Q S
BG-03 77 22 13.5
21
BG-06 83.5
4.5 17.5
26
BG-10 110 6 21.5
32
PRESSURE CONTROLS
Pilot Operated Relief Valves
271
C
Model
Number
A B C D E F G
BG-03 75 40 105 57 78 78 137
BG-06 75 40 105 40 60 78 161
BG-10 85 45 101 47 67 87.5 195
"A" SQ.
T
P
K
E
J
G
F
H
5
B
C
45 Dia.
Vent Port
"S" Thd.
Pressure Adjustment Handle
(Selectable in other 4 positions)
Two Collars
Lock Nut 14 Hex.
D
L
N
Pressure Gauge
Connection
"T" Thd.
Pressure Port
"Q" Thd.
2 Places
Fully Extended
Inc
There are two threaded connection pressure ports.
They can be connected each other in-line: one as
inlet and the other as an outlet or the valve can
be used by plugging one of the pressure port.
Pilot Operated Relief Valves
DIMENSIONS IN
MILLIMETRES
Model Numbers A B C D E F G H J K L N P Q
BGM-03
86 60 13 53.8 3.1 26.9 149 13 123
86
32
26
97 53.8
BGM-03X 95 21
BGM-06
108 78 15 70 4 35 180 15 150
106.5
51
27.2
121 66.7
BGM-06X 119 18
BGM-10
126 94 16 82.6 5.7 41.3 227 16 195
138.2
62
30.2
154 88.9
BGM-10X 158 17
Model Numbers S T U V X Y Z a b d
BGM-03
19 47.4 0 22 22
32
20 14.5 11 17.5
BGM-03X 40
BGM-06
37 55.5 23.8 33.4 11
40
25 23 13.5 21
BGM-06X 50
BGM-10
42 76.2 31.8 44.5 12.7
50
32 28 17.5 26
BGM-10X 63
03, 03X
10, 10X
Sub-Plate: BGM - 06, 06X-3080
PRESSURE CONTROLS
272
Model Numbers “e” Thd. “f” Thd.
BGM-03
M12 Thd. x 20 Deep
3/8 BSP.F
BGM-03X 1/2 BSP.F
BGM-06
M16 Thd. x 25 Deep
3/4 BSP.F
BGM-06X 1 BSP.F
BGM-10
M20 Thd. x 28 Deep
1 - 1/4 BSP.F
BGM-10X 1 - 1/2 BSP.F
Z
Y
N
L
K
J
G
F
D E
C
B
A
X
V
T
U
S
Q
P
7 Dia. x 10 Deep
"f" Thd.
2 Places
"a" Dia.
2 Places
6.2 Dia.
1
4
BSP.F Thd.
"e" Thd.
4 Places
"b" Dia. x Thru.
"d" Dia. Spotface
4 Places
H
Pilot Operated Relief Valves
■ Nominal Override Characteristics
■ Min. Adj Pressure & Vent Pressure Vs Flow
250
240
230
160
150
140
16
13
10
0 25 50
75
100
L/min.
Flow Rate
Kgf/cm²
250
240
230
160
150
140
19
16
13
0 50 100 150 200
L/min.
Flow Rate
Kgf/cm²
250
240
230
160
150
140
20
16
12
0 100 200 300 400
L/min.
Flow Rate
Kgf/cm²
Pressure Pressure
Pressure
PRESSURE CONTROLS
Pilot Operated Relief Valves
273
BG-03
BG-10
BG-06
BG-03 BT-06, BG-06
BG-10
C
Hydraulic Fluid Viscosity : 35 mm²/s (164 SSU)
Specific Gravity : 0.850
Hydraulic Fluid Viscosity : 35 mm²/s (164 SSU)
Specific Gravity : 0.850
7
6
4
2
0
0 25 50
75
100
L/min.
0 50 100 150 200
14
12
8
4
0
16
12
8
4
0
0 100 200 300 400
High Venting
Pressure Type
Low Venting
Pressure Type
Low Venting
Pressure Type
High Venting
Pressure Type
High Venting
Pressure Type
Low Venting
Pressure Type
Vent Pressure
Min. Adjustment Pressure
L/min.
L/min.
Flow Rate
Pressure
Kgf/cm²
Flow Rate
Pressure
Kgf/cm²
Flow Rate
Kgf/cm²
2
6
10
14
2
6
10
Pressure
Vent Pressure
Min. Adjustment Pressure
Vent Pressure
Min. Adjustment Pressure
1
3
5
Pilot Operated Relief Valves
■ Spare Parts List
List of Seals
Note: When ordering the seals, please specify the seal kit number from the table below.
Model Numbers Seal Kit Numbers
BG-03 KS-BG-03-32
BG-06 KS-BG-06-32
BG-10 KS-BG-10-32
BT-06 KS-BT-06-32
Sl.
No.
Name of
Parts
Part
Number
Quantity
BG-03 BG-06 BG-10 BT-06
1 O-Ring SO-NA-P9 1 1 1 1
2 O-Ring SO-NB-P9 1 - 1 -
3 O-Ring SO-NB-P11 - 1 - -
4 O-Ring SO-NB-P18 2 - - -
5 O-Ring SO-NB-P28 - 2 - -
6 O-Ring SO-NB-P32 1 1 2 1
7 O-Ring SO-NB-P42 - - 1 -
PRESSURE CONTROLS
274
List of Seal Kit
Solenoid Controlled Relief Valves
■
Solenoid Controlled Relief valves
These valves are a combination of relief valve and solenoid valve. Piping between the two is eliminated as the
solenoid valves is directly mounted on the relief valve and connected with the relief valve vent. Pump pressure may
be unloaded remotely by an electrical signal to the solenoid, or by connecting pilot relief valves to the solenoid valve
ports.
■ Specifications
■ Model Number Designation
* For minimum adjustment pressure and other characteristics, see page 273.
*1 Models with vent restrictor are applicable only for the vent type 2B3A and 2B3B For details see page 277.
*2 Use high venting pressure types to reduce response time from unloading to onloading.
*3 For the details of the vent types, see the following page.
*4 The coil codes are the same as for solenoid directional valves DSG-01. See solenoid Rating on EIC-E-1001-0,
Page No. 348.
Model Number
Max. Operating
Pressure
Kgf/cm
2
Pres. Adj.
Range
Kgf/cm
2
Max. Flow
L/min.
Mass (Kg)
Threaded
Connection
Sub-Plate
Mounting
Double
Solenoid
Single
Solenoid
With Vent
Restrictor
BST-06- - - - -4680
-
250
(Note)
*~250
200 7.4 6.8 7.8
-
BSG-03- - - - -46
100 7.1 6.5 7.5
-
BSG-06- - - - -46
200 8.0 7.4 8.4
-
BSG-10- - - - -46
400 11.3 10.7 11.7
PRESSURE CONTROLS
Solenoid Controlled
Relief valves
275
Note: For Relief Valves, standard pilot operated relief valves are used.
F- A- BS T -03 -V -2B3A -A120 -N -46 80
Special
Seals
With Vent
Restrictor
Series
Number
Type of
Mounting
Valve
Size
High Venting
Pres. Feature
Vent
Type
Coil Type
Type of
electrical
Connection
Design
Number
Design
Standard
F:
Special
Seals for
Phosphate
Ester Type
Fluids
(Omit if not
required)
A:
*1
With
Vent
Restrictor
(Option)
BS:
Solenoid
Controlled
Relief
Valves
T:
Threaded
Connection
06
V:
For High
*2
Venting
Pressure
Feature
(Omit if not
required)
2B3A
*3
2B3B
2B2B
2B2
3C2
3C3
AC:
A120
*4
A240
DC:
D12,D24
N:
With Plug-in
connector
(DIN)
N1:
With Plug-in
connector
with indicator
light (option)
46 80
G:
Sub-Plate
Mounting
03
06
10
C
■ Vent type
■ Spare Parts List
List of Seals
Sl.
No.
Name of
Parts
Part
Number
Quantity
BSG-03 BSG-06 BSG-10 BST-06 A-BSG-03 A-BSG-06 A-BSG-10 A-BST-06
1 O-Ring SO-NA-P9 1 1 1 1 1 1 1 1
2 O-Ring SO-NB-P9 1 - 1 - 1 - 1 -
3 O-Ring SO-NB-P18 2 - - - 2 - - -
4 O-Ring SO-NB-P32 1 1 2 1 1 1 2 1
5 O-Ring SO-NB-P11 - 1 - - - 1 - -
6 O-Ring SO-NB-P28 - 2 - - - 2 - -
7 O-Ring SO-NB-P42 - - 2 - - - 2 -
8
Bonded
Seal
SG-FB-1/8 2 2 2 2 2 2 2 2
9 O-Ring SO-NB-P8 - - - - 2 2 2 2
10 O-Ring SO-NB-P14 - - - - 2 2 2 2
Note: When ordering the seals, Please specify the seal kit number from the table below.
b
"B"
b
"A"
b
"B"
b
"A" "B"
a
b
"A" "B"
Solenoid Controlled Relief Valves
b
"A" "B"
a
PRESSURE CONTROLS
276
List of Seal Kits
Vent Type
Graphic Symbols
Solenoid Operated
Directional Valve
Model Number
Operation
SOL “a” SOL “b” Vent Connecting
2B3A DSG-01-2B3A --
OFF Connected to “A” port
ON Connected to tank (no-load)
2B3B DSG-01-2B3B --
OFF Connected to tank (no-load)
ON Connected to “B” port
2B2B DSG-01-2B2B --
OFF
Closed State (relief valve
Setting pressure)
ON Connected to “B” port
2B2 DSG-01-2B2 --
OFF Connected to “A” port
ON Connected to “B” port
3C2 DSG-01-3C2
OFF OFF
Closed State (relief valve
Setting pressure)
ON OFF Connected to “A” port
OFF ON Connected to “B” port
3C3 DSG-01-3C3
OFF OFF Connected to tank (no-load)
ON OFF Connected to “A” port
OFF ON Connected to “B” port
Model Numbers Seal kit numbers
A-BSG-03 KS-A-BSG-03-4680
A-BSG-06 KS-A-BSG-06-4680
A-BSG-10 KS-A-BSG-10-4680
A-BST-06 KS-A-BST-06-4680
Model Numbers Seal kit numbers
BSG-03 KS-BSG-03-4680
BSG-06 KS-BSG-06-4680
BSG-10 KS-BSG-10-4680
BST-06 KS-BST-06-4680
■ Attachment
■ Sub-Plate
■ Instructions
Mounting Bolts
Valve
Model Number
Sub-Plate
Model Number
Piping
Size
Mass
Kg.
BSG-03
BGM-03-3080 3/8 BSP.F 2.4
BGM-03X-3080 1/2 BSP.F 3.1
BSG-06
BGM-06-3080 3/4 BSP.F 4.7
BGM-06X-3080 1 BSP.F 5.7
BSG-10
BGM-10-3080 1-1/4 BSP.F 8.4
BGM-10X-3080 1-1/2 BSP.F 10.3
Sub-plates are available. Specify sub-plate model from the table above. When sub-plates are not
used, the mounting surface should have a good machined finish.
The sub-plates are those for pilot operated relief valves . For dimensions, refer page 272.
■ Option
With vent restrictor
The type with a vent restrictor valve, in vent types 2B3A and 2B3B added between relief valve and a
solenoid operated directional valve. It prevents shock to the main circuit by gradually lowering the venting
pressure in the shift from set pressure to unloading.
Unloading pressures are the same as without a vent restrictor.
b b
A-BS - -2B3A A-BS - -2B3B
The remote control relief valve is used in the vent circuit, see page 253 in EIC-C-1001. In addition, if
the internal volume of the vent line is too large, chattering is likely to occur. Thus, as far as
possible reduce the inside diameter and the length of the pipe.
To adjust the pressure, loosen the lock nut and turn the handle slowly clockwise for higher pressure
or anti-clockwise for lower pressures. One revolution of the handle makes about a
50 Kgf/cm
2
pressure change. After adjustments, do not forget to tighten the lock nut.
Pressure is limited by collars fitted. If a working pressure cannot be attained, remove some collars.
one collar is equivalent to 100 Kgf/cm
2
.
Piping of the tank line should not be connected to any tank line of the other valves, but connected
directly to the reservoir.
With a small flow, the setting pressure may be unstable. Use models numbered 03 and 06 with a
flow rate above 8 L/min. and model 10 with 15 L/min.
There are two threaded connection pressure ports in BST type. They can be connected each other
in-line; one as inlet and the other as an outlet or the valve can be used by plugging one of the
pressure ports.
Valve
Model Number
Socket Head Cap Screw Qty.
Bolt Kit
Ordering Code
BSG-03 M12 x 70Lg., M12 x 95Lg. 2 each BKBG - 03 - 30
BSG-06 M16 x 60Lg., M16 x 80Lg. 2 each BKBG - 06 30
BSG-10 M20 x 70Lg., M20 x 90Lg. 2 each BKBG - 10 - 30
Solenoid Controlled Relief Valves
PRESSURE CONTROLS
Solenoid Controlled
Relief valves
277
C
■ Models with Plug-in Connector
03
10
Model
Number
U
BSG-03, -N- 85
BSG-06, -N- 102.5
BSG-10, -N- 110
DIMENSIONS IN
MILLIMETRES
Model Number i h j
BSG- - - -A-N-4680
(with AC solenoid)
53 65 39
BSG- - - -D -N-
(with DC solenoid)
64 76 39
■ Option-Models With Vent Restrictor
Plug-in Connector Type
Sol b
d
Q
ff
ee
105
Item
Model
Number
d Q
Plug-in Connector Type
AC
Solenoid
DC
Solenoid
ee ff ee ff
A-BSG-03 115 77 245 180 256 191
A-BSG-06 132.5 83.5 281 185 292 196.5
A-BSG-10 140 110 315 193 326 204
03
10
2B3A
2B3B
BSG-06- - - -N-4680
A-BSG-06- - -4680
Solenoid Controlled Relief Valves
PRESSURE CONTROLS
278
210
48.5 48.5
j
U
i
h
4680 Design
Only
Pressure Gauge
Connection
1
4
BSP.Tr Thd.
Tank Port
Remote Control Port
"A"
1
8
BSP.F Thd.
Remote
Control Port
"B"
1
8
BSP.F Thd.
Vent Port
Pressure Port
Sol a Sol b
Cable Departure
Cable Applicable :
Outside Dia. ..... 8-10mm
Conductor Area .....
Not Exceeding 1.5mm
²
Model Number e f h
BST- - -
(with AC solenoid)
53 65 39
BST- - -D- -N-
(with DC solenoid)
64 76 39
Model Number T
BST-06- - - -N-
107
Item
Model
Number
d P
Plug-in Connector Type
AC Solenoid DC Solenoid
yy zz yy zz
A-BST-06 137 68.5 270.5 190 281.5 201
■ Models with Plug-in Connector
DIMENSIONS IN
MILLIMETRES
d
zz
yy
105
P
210
48.5 48.5
h
e
fT
Cable Departure
Cable Applicable :
Outside Dia. ..... 8-10mm
Conductor Area .....
Not Exceeding 1.5mm
²
Tank Port
3
4
BSP.F Thd.
Pressure Gauge Connection
1
4
BSP.Tr Thd.
Remote Control Port "A"
1
8
BSP.F Thd.
4680 Design Only
Vent Port
3
8
BSP.Tr Thd.
(Rear side)
Remote
Control Port "B"
1
8
BSP.F Thd.
Pressure Port
3
4
BSP.F Thd.
2 Places
■ Option-Models With Vent Restrictor
Plug-in Connector Type
2B3A
2B3B
BST-06- - - -N-4680
A-BST-06- - - -4680
PRESSURE CONTROLS
Solenoid Controlled
Relief valves
279
Solenoid Controlled Relief Valves
C
Pilot Operated Relief Valve
■
Pilot Operated Relief Valve
■ Specifications
These valves protect the hydraulic system from excessive pressure and can be used to maintain constant
Pressure in a hydraulic system. Vent circuit permits remote control and unloading.
Model Numbers
Max. Operating
Pressure
Kgf/cm
2
Pres. Adj. Range
Kgf/cm
2
Max. Flow
L/min.
Mass (Approx)
Kg.
YBG-03-P- -10
250
* ~ 250
60 2.7
* Design number subject to change from 10 to 19, but installation dimensions remain as shown.
■ Model Number Designation
PRESSURE CONTROLS
* Refer to ̒̒̒̒ ̒̒̒̒ Minimum Adjustment Pressure ̓ ̓ charecteristics on page 5.
Y
B
G
-
03
-
P
-
V
-
10
Series Number
Type of
Mounting
Valve
Size
Plunger
Type
High Venting Pressure
Feature
Design *
Number
Y:YIL
B:Pilot Operated
Relief Valve
G:Sub-Plate
Mounting
03
P: Pull
Type
V
:
For High Venting
Pressure Feature
(Omit if not required)
10
Vent Connection
280
Graphic Symbols
■
Attachment
Model Number
Socket Head Cap
Screw
Qty. Bolt Kit Ordering Code
YBG-03-P- -10
M12 x 55Lg. 4 BK-YBG-03-10
Mounting Bolts
Valve Model
Numbers
Sub-plate Model
Number
Thread Size
Mass (Approx)
Kg.
YBG-03-P- -10
BGM-03-3080 3/8 BSP.F
2.4
BGM-03X-3080 1/2 BSP.F
■
Sub-plate
Sub-plates are available. Specify sub-plate model from the table above. when sub-plates are not used, the mounting
surface should have a good machined finish.
Pilot Operated Relief Valve
281
PRESSURE CONTROLS
■ Instructions
If the internal volume of the vent line is too large, chattering is likely to occur. Thus, as far as possible reduce the
inside dia.and lenth of the pipe
To adjust the pressure, loosen the lock nut and turn the handle slowely clockwise for higher pressure or
anti-clockwise for lower pressure. One revolution of the handle makes about a 50Kg/cm² pressure change. After
adjustment, do not forget to tighten the lock nut.
Piping of the tank line should not be connect to tank line of the other valves, but connect directly to tank.
With a small flow, the setting pressure may be unstable.
There are two threaded connection pressure ports. They can be connected to each other in-line one inlet and the other
as an outlet or the valve can be used by plugging one of the pressure ports.
YBG-03-P- 10
7.5
33
54
35.5
184.5
54
44
81
13 Dia. x Thru.
20 Dia. Spotface x 12.5 Deep
4 Places
47.5
12.5
59.5
82
44.5 Dia.
2320
45.5
66.5
79.5
Pressure Adj. Knob
Jum Nut
Lock Nut
M16 x 1.5
6
Locating Pin
6 Dia.
Surface Mounting
(O-Ring Furnished)
Pilot Operated Relief Valves
* For subplate details, see page 272.
C
Pilot Operated Relief Valve
PRESSURE CONTROLS
L/min.
Kgf/cm²
60
50403020100
20
40
60
80
100
120
140
160
Flow
Pressure
■ Min. Adj. Pressure & Vent
Pressure vs Flow
V
e
n
t
P
r
e
s
s
u
r
e
M
i
n
.
a
d
j
u
s
t
m
e
n
t
.
P
r
e
s
s
u
r
e
Kgf/cm²
L/min.
6050403020100
1
2
3
4
Flow
Pressure
5
■ Nominal Override Characteristics
■ Spare Parts List
List of Seals
Sl.
No.
Name of Parts Parts Number Qty.
1 O-Ring SO-NA-P4 1
2 O-Ring SO-NA-P9 2
3 O-Ring SO-NA-P14 2
4 O-Ring SO-NA-P22A 1
5 O-Ring SO-NB-P25 1
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Note : When ordering the seals, please specify the seal kit number KS-YBG-03-10.
