SEQUENCE VALVE / UNLOAD VALVE（HQ，HU）■FeaturesThis type of valve is used to control the operating sequence of the hydraulic circuit (sequenceoperation) or to relieve the pump pressure from the loaded state to the unloaded state(unloading operation).
● Sequence valves are classified into three types, namely the internal pilot type, the externalpilot type and the internal/external pilot type, according to the source of the pilot pressure.

B
PRESSURE CONTROL VALVES■Description of the model designation

HQ3ｰDG2Eｰ06（A）
Model No.
Nominal size
Pilot type
No code: Internal pilot E: External pilot
B: Internal/external pilot
Pressure adjustment range
1: 0.3 to 0.85 MPa
2: 0.5 to 1.75 MPa
3: 0.85 to 3.5 MPa
4: 1.75 to 7 MPa
5: 3.5 to 14 MPa (also available)
6: 10.5 to 21 MPa (also available)
Piping method
G: Gasket type

T: Rc thread type

Construction D: Direct typeMax. operating pressure 2: 14 MPa
3: 21 MPa
HQ: Sequence valve
Hu: Unloading valve

Internal pilot type sequence valve
INNominal size

OUT DR

Rated flow rate(L/min)

02503

3506120Max. operating pressure(MPa)

Thread joint type

Model
Gasket joint type

14—

HQ2ｰDG*ｰ02A

HQ3ｰDT*ｰ03

HQ3ｰDG*ｰ03

HQ3ｰDT*ｰ06

HQ3ｰDG*ｰ06

21

External pilot type sequence valve
INNominal size
PLT02
OUT DR

Rated flow rate
(L/min)

503

3506

120

Max. operating pressure(MPa)

Thread joint type

ModelGasket joint type

14—

HQ2ｰDG*Eｰ02A

HQ3ｰDT*Eｰ03

HQ3ｰDG*Eｰ03

HQ3ｰDT*Eｰ06

HQ3ｰDG*Eｰ06

21Internal, external pilot type sequence valve
INPLT
OUT DR

Nominal size

Rated flow rate(L/min)

03

3506

120Max. operating pressure(MPa)

Model

21

Thread joint type

Gasket joint type

HQ3ｰDT*Bｰ03

HQ3ｰDG*Bｰ03

HQ3ｰDT*Bｰ06

HQ3ｰDG*Bｰ06

Please note that this type has not the pressure adjustment range of 1: 03 – 0.8 MPa.

Pilot pressure ratio of internal, external pilot type sequence valve

Nominal size

03
06

Pilot pressure ratio (Note)
Pressure adjustment range code
2 to 45 to 6

1/10
1/10

1/18
1/16.5

NOTE: The pilot pressure ratio is the ratio of externalpilot pressure relative to the internal pilotpressure.

B−17

Unload valve
IN

PLT

OUT

Nominal size

Rated flow rate(L/min)

03

3506

120

Max. operating pressure(MPa)

Model

21

Thread joint type

Gasket joint type

HU3ｰDT*Eｰ03

HU3ｰDG*Eｰ03

HU3ｰDT*Eｰ06

HU3ｰDG*Eｰ06■Outside dimensions
HQ3ｰDT**ｰ**HU3ｰDT*Eｰ**

PRESSURE CONTROL VALVES

Pressure adjustment screw
Lock nut
2−Rc1/4
Size 03：Rc1/8

RE
F

H
G

Maximum C

3−RcQ

DB

A

Pressure gauge
outlet Rc1/4

B

JKLN

Unit: mm
ModelA

H*3ｰDT**ｰ03
H*3ｰDT**ｰ06B−18

NOTE: The unload valve has the internal drain.

BCDEFGHJKL

NQR

Mass (kg)6296

18556095

1745.5

5662

30

48

78

3/8

54570

110

221

68.5

115.5

21.5

57.5

66.5

70

3554

89

3/4

586

■Outside dimensions
HQ3ｰDG**ｰ**S H Q * * ｰ * * T 1（ A ）HU3ｰDG*Eｰ**Pressure adjustment screw

4ーφv
φw counterbore depth 1

2ーφ7, depth 8ℓabcde

GLIN
Rc1/4
2ーφaavーMy

2ーφbbtuFKB

2ーQ（O-ring）

DEA

2ーRc1/4

NOTE: For HQ2ｰDG*（E）ｰ02A, refer to page Bｰ22.

2ーRcZ

NOTE: For SHQ**ｰ**T3, refer to page L-5.
Unit: mmModelABCDEFGHJKLNPQMass (kg)H*3ｰDG**ｰ03

88151

185

6767

43434101566JIS B 2401ｰ1AG21

JIS B2401ｰ1AP113.8

H*3ｰDG**ｰ06

10218422175

8050604101666JIS B 2401ｰ1AG30

JIS B2401ｰ1AP165.8cdefgh

Modelabijkℓqrsaabb

SHQ03ｰ03T1 19 51 67 106.4

130

7 11 21.5− 21.5 36

43 0mn5 38 43p

1165 11 25tu

11 17.5 4 10 3/8 5vwxyz

14.5

SHQ03ｰ04T1 19 51 67 106.4130

7 11 21.5− 21.5 36

43 4.5 7 45 52

1174 11 30

11 17.5 4 10 1/2 5

14.5

SHQ06ｰ06T1 24 68 80 124

146

11 16 21− 3949

60 06 54 60

1896 11 35

11 17.5 4 10 3/4 619

SHQ06ｰ08T1 24 68 80 124

146

11 16 21− 3949

60 67 65 72

18 108 11 43

11 17.5 4 101915B−19PRESSURE CONTROL VALVESBC Max.

2ーφNsqHーMJjkfipg

2ーP（O-ring）

hnmr

Lock nut