DH6/10

Relief valve – Balanced piston type pilot operated (1)
With shock damping valve
(Y)
X
P
T
Relief valve – Balanced piston type pilot operated (1)
Overview
This balanced piston type pilot operated
relief valve, which is a seat type relief
valve, regulates the highest pressure of
the hydraulic circuit and at the same time
prevents overload of the hydraulic
equipment and drive machines and sets
pressure for control of the hydraulic
equipment. The relief valve with unloading
function is used for loading and unloading
the circuit pressure with electrical signals.
Type indication
RB
Features
1. As this valve has a larger seat diameter
than that of a general balance type relief
valve, it has good responsiveness and
flow resistance when unloaded is small.
2. Pressure override is small.
3. Operation is correct and both
responsiveness and stability are good.
4. The relief valve with unloading function
can perform shockless, smooth
unloading if it is used together with the
shock damping valve (refer to the
section of the type number index
“ZNS5”).
Relief valve - balanced piston type pilot operated
Nominal dimension
Nominal dimension
10
20
30
RB*P
Connection method
P = Gasket connection type
C = Cartridge type
Series number : 10
RB*C
Shape of pressure adjusting part
1 = Handle adjustment
2 = Thread adjustment (with cap)
3 = Handle with key adjustment
Type of hydraulic oil
No symbol = Mineral based hydraulic oil
V = Phosphate ester based hydraulic oil
W = Fatty ester based hydraulic oil
Water-glycol based hydraulic oil
Drain system
No symbol = Internal drain
Y = External drain
Vent port
No symbol= Without vent port
X = With vent port
(gasket connection type is X only)
(cartridge type is no symbol only)
Highest adjustment pressure
100 = 9.8MPa (100kgf/cm 2 )
315 = 30.9MPa (315kgf/cm 2 )
Hydraulic symbols
RB RBE
P (X) P
RBE
(with shock damping valve)
P
● If you wish to
purchase a relief
valve with a check
valve, refer to the
section of the type
number index “ZA10,
20, 30”.
Hydraulic symbols
P
A
T
Pressure increase value per turn
(clockwise) of adjust thread MPa (kgf/cm 2 )
Nominal
Highest dimension
adjustment pressure
100
10, 20, 30
1.75(17.8)
T
(Y)
T
(Y)
T
(Y)
315
14.1(143.9)
(Note) As the above value is a calculated value, there
are slight variations in the product.
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