209
PRESSURE CONTROLS
Pilot Operated
Relief Valves
C
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 using vent circuits.
Model Numbers
Threaded
Connection
Sub-plate
Mounting
Max. Operating
Pressure
MPa (PSI)
Approx. Mass
kg (lbs.)
BT type BG type
5.0
(11.0)
Pres. Adj.
Range
MPa (PSI)
Max. Flow
L/min
(U.S.GPM)
BT-03-
*
-32
*
BG-03-
*
-32
*
4.7
(10.4)
5.0
(11.0)
5.6
(12.3)
8.5
(18.7)
8.7
(19.2)
100
(26.4)
200
(52.8)
400
(106)
BT-06-
*
-32
*
BG-06-
*
-32
*
BT-10-
*
-32
*
BG-10-
*
-32
*
25 (3630)
Note)
-25
( -3630)
Series Number
F:
Special Seals
for Phosphate
Ester Type
Fluids
(Omit if not
required)
Special Seals
F-
32
32
32
32
32
32
B
B:
Pilot Operated
Relief Valves
T:
Threaded
Connection
G:
Sub-plate
Mounting
T
Type of
Mounting
Valve
Size
High Venting
Pres. Feature
Design Standards
-V
*
-03
None:
Japanese Std. "JIS"
80:
European Design Std.
90:
N. American Design Std.
None:
Japanese Std. "JIS" and
European Design Std.
90:
N. American Design Std.
-32
Design
Number
03
06
10
03
06
10
V:
For High
Venting
Pressure
Feature
(Omit if not
required)
Specifications
Note: Refer to the Minimum adjustment Pressure characteristics on page 214.
Use high venting pressure type to reduce the response time from unload to onload.
Graphic Symbols
Vent Connection
Model Number Designation
Pilot Operated Relief Valves
210
Valve
Model Numbers
Japanese Std. "JIS" and European Design Std. N. American Design Std.
Socket Head Cap Screw
BG-03
BG-06
BG-10
M12 70 Lg. (2 pcs.), M12 95 Lg. (2 pcs.)
M16 60 Lg. (2 pcs.), M16 80 Lg. (2 pcs.)
M20 70 Lg. (2 pcs.), M20 90 Lg. (2 pcs.)
1/2-13UNC 2-3/4 Lg. (2 pcs.), 1/2-13UNC 3-3/4 Lg. (2 pcs.)
5/8-11UNC 2-1/4 Lg. (2 pcs.), 5/8-11UNC 3-1/4 Lg. (2 pcs.)
3/4-10UNC 2-3/4 Lg. (2 pcs.), 3/4-10UNC 3-1/2 Lg. (2 pcs.)
Valve
Model
Numbers
Japanese Standard "JIS" European Design Standard N. American Design Standard
Approx.
Mass
kg (lbs.)
Sub-plate
Model Numbers
Thread
Size
Sub-plate
Model Numbers
Thread
Size
Sub-plate
Model Numbers
Thread
Size
BG-03
BG-06
BG-10
BGM-03-20
BGM-03X-20
BGM-06-20
BGM-06X-20
BGM-10-20
BGM-10X-20
Rc 3/8
Rc 1/2
Rc 3/4
Rc 1
Rc 1-1/4
Rc 1-1/2
BGM-03-3080
BGM-03X-3080
BGM-06-3080
BGM-06X-3080
BGM-10-3080
BGM-10X-3080
3/8 BSP.F
1/2 BSP.F
3/4 BSP.F
1 BSP.F
1-1/4 BSP.F
1-1/2 BSP.F
BGM-03-2090
BGM-03X-2090
BGM-06-2090
BGM-06X-2090
BGM-10-2090
BGM-10X-2090
3/8 NPT
1/2 NPT
3/4 NPT
1 NPT
1-1/4 NPT
1-1/2 NPT
2.4
3.1
4.7
5.7
8.4
10.3
(5.3)
(6.8)
(10.4)
(12.6)
(18.5)
(22.7)
Attachment
Mounting Bolts
Instructions
Sub-plate
Sub-plates are available. Specify the sub-plate model number from the table above. When sub-plates are not used, the mounting surface should have a
good machined finish.
If a remote control relief valve is used in the vent circuit, see
page 203. 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 diametre and the length of the
pipe.
To adjust the pressure, loosen the lock nut and turn the handle slowly clockwise for higher pressures or anti-clock-
wise for lower pressures. After adjustments, do not forget to tighten the lock nut.
Piping of the tank line should not be connected to any tank line of the other valves, but connected directly to the
reservoir.
Pressure is limited by collars fitted. If a working pressure cannot be attained, remove some collars. One collar is
equivalent to 10 MPa (1450 PSI).
With a small flow, the setting pressure may be unstable. Use models numbered 03 and 06 with a flow rate above
8 L/min (2.1 U.S. GPM) and model 10 with 15 L/min (4.0 U.S. GPM).
211
PRESSURE CONTROLS
Pilot Operated
Relief Valves
C
Pilot Operated Relief Valves
DIMENSIONS IN
MILLIMETRES (INCHES)
Model Numbers
Dimensions mm (Inches)
A
BT-03-
*
-32/3280/3290
BT-06-
*
-32/3280/3290
BT-10-
*
-32/3280/3290
75
(2.95)
B C D E F H J K L N Q
40
(1.57)
105
(4.13)
52
(2.05)
78
(3.07)
150.5
(5.93)
68.5
(2.70)
62
(2.44)
36
(1.42)
52
(2.05)
90
(3.54)
45
(1.77)
85
(3.35)
50
(1.97)
101
(3.98)
80
(3.15)
96
(3.78)
183
(7.20)
89
(3.50)
74
(2.91)
80
(3.15)
120
(4.72)
49
(1.93)
60
(2.36)
Model Numbers
BT-03-
*
-32
BT-03-
*
-3280
BT-03-
*
-3290
BT-06-
*
-32
BT-06-
*
-3280
BT-06-
*
-3290
BT-10-
*
-32
BT-10-
*
-3280
BT-10-
*
-3290
Thread Size
"S"
Thd.
"T"
Thd.
"U"
Thd.
Rc 3/8
3/8 BSP.F
3/8 NPT
Rc 3/4
3/4 BSP.F
3/4 NPT
Rc 1-1/4
1-1/4 BSP.F
1-1/4 NPT
Rc 3/8
3/8 BSP.F
3/8 NPT
Rc 3/8
3/8 BSP.F
3/8 NPT
Rc 3/8
3/8 BSP.F
3/8 NPT
Rc 1/4
1/4 BSP.Tr
1/4 NPT
Rc 1/4
1/4 BSP.Tr
1/4 NPT
Rc 1/4
1/4 BSP.Tr
1/4 NPT
Lock Nut
14(.55)
Hex.
"A"
SQ.
Two Collars
Four positions of pressure adjustment handle
are available by rotating cover assembly as shown.
Fully Extended
C
B
INC.
Pressure Adjustment
Handle
D
44(1.73)
Dia.
5(.20)
3280 Design Only
F
J
H
K
L
E
Q
N
T
P
Pressure Gauge Connection
"U"
Thd.
Pressure Port
"S"
Thd. 2 Places
Tank Port
"S"
Thd.
Vent Port
"T"
Thd.
BT-03-
*
-32/3280/3290
BT-06-
*
-32/3280/3290
BT-10-
*
-32/3280/3290
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.
Pilot Operated Relief Valves
212
DIMENSIONS IN
MILLIMETRES (INCHES)
Model Numbers
BG-03-
*
-32/3290
BG-06-
*
-32/3290
BG-10-
*
-32/3290
75
(2.95)
75
(2.95)
85
(3.35)
45
(1.77)
40
(1.57)
40
(1.57)
101
(3.98)
105
(4.13)
105
(4.13)
47
(1.85)
57
(2.24)
40
(1.57)
67
(2.64)
78
(3.07)
60
(2.36)
87.5
(3.44)
78
(3.07)
78
(3.07)
195
(7.68)
137
(5.39)
161
(6.34)
20.7
(.81)
14.1
(.56)
17
(.67)
62
(2.44)
41
(1.61)
52
(2.05)
124
(4.88)
82
(3.23)
104
(4.09)
175
(6.89)
117
(4.61)
141
(5.55)
110
(4.33)
77
(3.03)
83.5
(3.29)
6
(.24)
22
(.87)
4.5
(.18)
21.5
(.85)
13.5
(.53)
17.5
(.69)
32
(1.26)
21
(.83)
26
(1.02)
45
(1.77)
55
(2.17)
38
(1.50)
65
(2.56)
77
(3.03)
58
(2.28)
Dimensions mm (Inches)
A B C D E F H J K L N P Q S T U V
Model Numbers
BG-03-
*
-32
BG-03-
*
-3290
BG-06-
*
-32
BG-06-
*
-3290
BG-10-
*
-32
BG-10-
*
-3290
1/4 = 1/4 BSP.Tr
1/4 NPT
1/4 = 1/4 BSP.Tr
1/4 NPT
1/4 = 1/4 BSP.Tr
1/4 NPT
Rc
Rc
Rc
Thread Size
"X"
Thd
Mounting Surface
ISO 6264-AR-06-2-A
ISO 6264-AS-08-2-A
ISO 6264-AT-10-2-A
"S"
Dia. Through
"T"
Dia. Spotface
4 Places
Tank Port
Pressure Port
Pressure Gauge Connection
"X"
Thd.
Vent Port
INC.
Pressure Adjustment Handle
Locating Pin
6(.24)
Dia.
Mounting Surface
(O-Rings Furnished)
Lock Nut
14(.55)
Hex.
Two Collars
Three positions of pressure adjustment handle
are available by rotating cover assembly as shown.
"A"
SQ.
B
Fully Extended C
44(1.73)
Dia.
6
(.24)
U
D
V
E
F
L
K
J
Q
P
N
H
BG-03-
*
-32/3290
BG-06-
*
-32/3290
BG-10-
*
-32/3290
213
PRESSURE CONTROLS
Pilot Operated
Relief Valves
C
Pilot Operated Relief Valves
DIMENSIONS IN
MILLIMETRES (INCHES)
86
(3.39)
Model Numbers
BGM-03
BGM-03X
BGM-06
BGM-06X
BGM-10
BGM-10X
Model Numbers
BGM-03
BGM-03X
BGM-06
BGM-06X
BGM-10
BGM-10X
Dimensions mm (Inches)
A B C D E F H J K L N P Q S
Dimensions mm (Inches)
T U V X Y Z a b d e f
95
(3.74)
106.5
(4.19)
119
(4.69)
138.2
(5.44)
158
(6.22)
26
(1.02)
21
(.83)
27.2
(1.07)
18
(.71)
30.2
(1.19)
17
(.67)
86
(3.39)
108
(4.25)
126
(4.96)
60
(2.36)
78
(3.07)
94
(3.70)
13
(.51)
15
(.59)
16
(.63)
53.8
(2.12)
70
(2.76)
82.6
(3.25)
3.1
(.12)
4
(.16)
5.7
(.22)
26.9
(1.06)
35
(1.38)
41.3
(1.63)
149
(5.87)
180
(7.09)
227
(8.94)
13
(.51)
15
(.59)
16
(.63)
123
(4.84)
150
(5.91)
195
(7.68)
32
(1.26)
51
(2.01)
62
(2.44)
97
(3.82)
121
(4.76)
154
(6.06)
53.8
(2.12)
66.7
(2.63)
88.9
(3.50)
19
(.75)
37
(1.46)
42
(1.65)
47.4
(1.87)
55.5
(2.19)
76.2
(3.00)
0
(0)
23.8
(.94)
31.8
(1.25)
22
(.87)
33.4
(1.31)
44.5
(1.75)
22
(.87)
11
(.43)
12.7
(.50)
32
(1.26)
40
(1.57)
40
(1.57)
50
(1.97)
50
(1.97)
63
(2.48)
14.5
(.57)
23
(.91)
28
(1.10)
11
(.43)
13.5
(.53)
17.5
(.69)
17.5
(.69)
21
(.83)
26
(1.02)
19
(.75)
24
(.94)
31
(1.22)
20
(.79)
25
(.98)
32
(1.26)
Model
Numbers
BGM-03
BGM-03X
BGM-06
BGM-06X
BGM-10
BGM-10X
Japanese Standard "JIS"
Design "20"
European Design Standard
Design "3080"
N. American Design Standard
Design "2090"
"h" "n"
Thd.
"t"
Thd.
"h" "n"
Thd.
"t"
Thd.
"h" "n"
Thd.
"t"
Thd.
Rc 3/8
Rc 1/2
Rc 3/4
Rc 1
Rc1-1/4
Rc 1-1/2
3/8 BSP.F
1/2 BSP.F
3/4 BSP. F
1 BSP.F
1-1/4 BSP.F
1-1/2 BSP.F
3/8 NPT
1/2 NPT
3/4 NPT
1 NPT
1-1/4 NPT
1-1/2 NPT
Rc 1/4 1/4 BSP.F 1/4 NPT
M12 Thd.
20(.79) Deep
M16 Thd.
25(.98) Deep
M20 Thd.
28(1.10) Deep
M12 Thd.
20(.79) Deep
M16 Thd.
25(.98) Deep
M20 Thd.
28(1.10) Deep
1/2-13UNC Thd.
22(.87) Deep
5/8-11UNC Thd.
27(1.06) Deep
3/4-10UNC Thd.
28(1.10) Deep
Z
a
f
A
B
D
F
C
E
Y
V
T
X
U
S
Q
P
N
L
K
H
J
"d"
Dia. Through
"e"
Dia. Spotface
4 Places
"h"
4 Places
7(.28)
Dia.
10(.39)
Deep
"n"
Thd. 2 Places
(From Rear)
"b"
Dia.
2 Places
6.2(.24)
Dia.
"t"
Thd.
BGM-03,03X-20 / 3080 / 2090
BGM-06,06X-20 / 3080 / 2090
BGM-10,10X-20 / 3080 / 2090
Pilot Operated Relief Valves
214
3600
3300
2300
2000
225
150
PSI
25
24
23
16
15
14
1.6
1.3
1.0
MPa
0 25 50 75 100 L/min
0 5 10 15 20 25 U.S. GPM
Flow Rate
3600
3300
2300
2000
275
200
PSI
25
24
23
16
15
14
1.9
1.6
1.3
MPa
0 50 100 150 200 L/min
0 10 20 30 40 50 U.S. GPM
Flow Rate
3600
3300
2300
2000
300
200
PSI
25
24
23
16
15
14
2.0
1.6
1.2
MPa
0 25 50 75 100 U.S. GPM
Flow Rate
0 100 200 300 400 L/min
Pressure Pressure
Pressure
100
80
60
40
20
0
PSI MPa
0.7
0.6
0.4
0.2
0
0 25 50 75 100 L/min
0 5 10 20 25 U.S. GPM15
Flow Rate
0 50 100 150 200 L/min
0 10 20 40 50 U.S. GPM30
Flow Rate
MPa
1.4
1.2
0.8
0.4
0
200
150
100
50
0
PSI
225
200
150
100
50
0
PSI MPa
1.6
1.2
0.8
0.4
0
0 100 200 300 400 L/min
0 25 75 100 U.S. GPM50
Flow Rate
Pressure
Pressure
Pressure
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
Vent Pressure
Min. Adjustment Pressure
Vent Pressure
Min. Adjustment Pressure
Nominal Override Characteristics
Min. Adj. Pressure & Vent Pressure vs. Flow
BT-03, BG-03 BT-06, BG-06
BT-10, BG-10
Hydraulic fluid:
Viscosity :
2
35 mm /s (164 SSU)
Specific Gravity :
0.850
Hydraulic fluid:
Viscosity :
2
35 mm /s (164 SSU)
Specific Gravity :
0.850
BT-03, BG-03 BT-06, BG-06
BT-10, BG-10
215
PRESSURE CONTROLS
Pilot Operated
Relief Valves
C
Pilot Operated Relief Valves
Spare Parts List
Name of Parts
Part Numbers
Qty.
1
1
1
O-Ring
O-Ring
Bonded Seal
16
17
24
SO-NA-P9
SO-NB-P32
SG-FB-3/8
Item
BT-03 BT-06 BT-10
SO-NA-P9
SO-NB-P42
SG-FB-3/8
Name of Parts
Part Numbers
Qty.
1
1
2
1
O-Ring
O-Ring
O-Ring
O-Ring
17
18
19
20
SO-NA-P9
SO-NB-P9
SO-NB-P18
SO-NB-P32
Item
BG-03 BG-06 BG-10
SO-NA-P9
SO-NB-P11
SO-NB-P28
SO-NB-P32
SO-NA-P9
SO-NB-P9
SO-NB-P32
SO-NB-P42
Valve Model Numbers Seal Kit Numbers
BG-03
BG-06
BG-10
KS-BG-03-32
KS-BG-06-32
KS-BG-10-32
Valve Model Numbers Seal Kit Numbers
BT-03
BT-06
BT-10
KS-BT-03-32
KS-BT-10-32
21
20
15
19
1
4
3
5
14
18
22
6
7
8
9
10
11
13
12
21 16
6
7
8
2
9
10
11
13
12
25
23
15
22
1
14
5
3
24
4
A
23
List of Seal Kits
List of Seals
List of Seals
List of Seal Kits
Note: When ordering the seals, please specify the seal kit number from the
table below.
Note: No bonded seals are included in the seal kits.
Note:
BT-03-
*
-32/3280/3290
BT-06-
*
-32/3280/3290
BT-10-
*
-32/3280/3290
Section "A"
for Design 3280
BG-03-
*
-32/3290
BG-06-
*
-32/3290
BG-10-
*
-32/3290
When ordering the seals, please specify the seal kit number from the
table below.
2 16
17
24
17
20
18
19
