DH6/10

Type indication (relief valve – direct operated type for vent control)
Relief valve – direct operated
type for vent control
Nominal dimension
6, 10
Connection method
G = G thread connection type
GO = G thread connection type (based on JISB2351 0 type)
R = R thread connection type
P = Gasket connection type
C = Cartridge type
Series number: 10
Type of hydraulic oil
No symbol = Mineral based hydraulic oil
V
W
= Phosphate ester based hydraulic oil
= Fatty ester based hydraulic oil
Water-glycol based hydraulic oil
(Note) In the case of the cartridge type, “No symbol” and
“W” are identical, and therefore, there is no “W”.
P port restriction contraction diameter
10
12
15
18
=
=
=
=
1.0mm
1.2mm
1.5mm
1.8mm
Relief valve – Direct operated type
Shape of pressure adjusting part
1 = Handle adjustment
2 = Thread adjustment (with cap)
3 = Handle with key adjustment
Specifications
Nominal dimension 6
Maximum working
pressure
MPa (kgf/cm 2 )
Port P
Port T
39.2 (400)
30.9 (315)
Maximum flow rate L/min
Thread connection type
3 (Note)
1.5
Mass kg Gasket connection type
Cartridge type
1.5
0.4
(Note) Be very careful that the minimum adjustment
pressure and pressure override values differ
depending on the flow rate used and
restriction and contraction diameters of the
main relief valve and relief valve for vent
control.
Highest adjustment pressure
100 = 9.8MPa (100kgf/cm 2 )
315 = 30.9MPa (315kgf/cm 2 )
Precautions in use
● Make the vent conduit as short as
possible and the inside diameter of
piping as small as possible. If the
inside volume of the vent conduit is
large, control may become unstable.
● Do not connect the tank piping to
other tank piping but connect it
directly to the tank.
●For the pressure increase value per turn of the adjust thread, refer to the section of the type number index “RD6 to 30”.
Type indication (relief valve for panel mounted vent control )
Relief valve for panel
mounted vent control
Nominal dimension
6
Connection method
R = R thread connection type
Series number: 10
Shape of pressure adjusting part
3 = Handle with key adjustment
Type of hydraulic oil
No symbol = Mineral based hydraulic oil
Fatty ester based hydraulic oil
Water-glycol based hydraulic oi
V = Phosphate ester based hydraulic oil
P port restriction contraction diameter
10
12
15
18
=
=
=
=
1.0mm
1.2mm
1.5mm
1.8mm
Highest adjustment pressure
315 = 30.9MPa (315kgf/cm 2 )
(Pressure adjustment range = 2 to 30.9 MPa)
Specifications
Nominal dimension 6
Maximum working pressure MPa (kgf/cm 2 )
30.9 (315)
Maximum flow rate L/min
3 (Note)
Operating force
Maximum approx. 2 Nm (20 kgfcm) (however, in the case of back pressure being 0)
Mass kg
1.5
(Note) Be very careful that the minimum adjustment pressure and pressure override values differ depending
on the flow rate used and restriction and contraction diameters of the main relief valve and relief valve
for vent control.
Precautions in use
● Make the vent conduit as short as
possible and the inside diameter of
piping as small as possible. If the
inside volume of the vent conduit is
large, control may become unstable.
● Do not connect the tank piping to
other tank piping but connect it
directly to the tank.
2-4