DH6/10

Relief valve – Direct operated type
RD
Thread adjusting type
T
P
Relief valve – Direct operated type
Overview
This direct operated type relief valve,
which is a seat type relief valve, prevents
momentary pressure increase of the
hydraulic circuit and at the same time is
used for load holding.
Type indication
Features
1. This valve is very responsive and is optimum
especially for a relief valve.
2. As a cartridge type is available, it can be
incorporated in a manifold in a compact way.
3. As this valve is of seat type, it has less
internal leakage compared to the balance
type relief valve.
4. As this valve is provided with the
chattering preventive mechanism, its
operation is stable.
Relief valve – Direct operated type
Nominal dimension
6, 8, 10, 15
20, 25, 30
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
Nominal
dimension
6
8
10
15
20
25
30
Series number: 10
RD
G GO R P C
Shape of pressure adjusting part
1 = Handle adjustment
2 = Thread adjustment (with cap)
3 = Handle with key adjustment
(nominal dimension 6, 8, 10 only)
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”.
Highest adjustment pressure
25 = 2.5 MPa 25 kgf/cm 2
50 = 4.9 MPa 50 kgf/cm 2
100 = 9.8 MPa 100 kgf/cm 2
200 = 19.6 MPa 200 kgf/cm 2
315 = 30.9 MPa 315 kgf/cm 2
400 = 39.2 MPa 400 kgf/cm 2
630 = 61.7 MPa 630 kgf/cm 2
Nominal
dimension
6
8
10
15
20
25
30
Highest adjustment pressure
25 50 100 200 315 400 630
(Note) As the minimum set pressure differs
depending on the flow rate, refer to
“Pressure override characteristics”.
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