Relief Valves
Description
Symbol
Cross Section
Cavity Details
98
METRIC Cartridge - 350 bar
Direct acting - Poppet type
Technical Features
All external surfaces are zinc plated and cor-
rosion-proof. All valve parts are made of high
strength steel. Poppet is hardened and ground to
guarantee minimal wear and extended service life.
Positive stop prevents springs from going solid.
Optional spring ranges to 350 bar (5000 psi).
Metric cavity.
A screw-in, cartridge style, direct acting, poppet
type, normally closed hydraulic relief valve. It's
typically used to protect hydraulic components
from pressure transients. When the pressure at the
Inlet (1) reaches the valve setting, the valve starts
to open to tank (2) and thanks to the effect of the
deflector integrated into the poppet it provides a
limited pressure rise. The cartridge offers exellent
response to load changes in hydraulic circuits
requiring low internal leakage as well as limited
hyseresis. Innovative design on internal dampening
part guarantees great stability.
VH160
RVB2.M18 Valve Series
Technical Data
99
Specication may change without notice.
Ordering Code
Maximum operating pressure 350 bar
Maximum flow 60 l/min
Setting Pressure See table below
Maximum internal leakage 5 cm
3
/min to 80% of nominal set point
External component treatment
Zn/Fe - standard (96h)
Zn/Ni (720h)
O-ring Temperature Range -30° C to 110° C (standard sealing NBR - BUNA-N)
Oil Temperature Range -30° C to 110° C
Pressure settings established @5 l/min
Reseat pressure nominal 90% of cracking pressure
Fluids Mineral - based or synthetics with lubricating properties
Viscosities 7,4 to 420 cSt
Filtration 20/18/15 (maximum ltration admitted)
Orientation No restrictions
Installation torque 50-55 Nm (Hex. 22)
Tightening torque nut 5-10 Nm (Hex. 10)
Technical specications for characterization See page 480
Declared reset value is obtained with valve set max P -10%
Oil testing condition ISO VG 46 cSt
Seal kit code SK.102
Weight 0,089 kg
Relief Valves
100
RVB2.M18 Valve Series
Spring = N (51 - 90bar)
Spring = B (91 - 130bar)
Flow (l/min)
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Pressure (bar)
p/Q performance
p/Q performance
p/Q performance
1
Spring = Y (20 - 50bar)
2
3
Note: The performance chart illustrates flow handling capacity for each
spring bias options. P/Q curves are recorded at TOil = 40°C and 46 cSt
Springs’ Graphs
101
Specication may change without notice.
5
6
p/Q performance
Flow (l/min)
Pressure (bar)
4
Spring = V (206 - 275bar)
Spring = W (276 - 350bar)
Spring = G (131 - 205bar)
p/Q performance
p/Q performance
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
