Relief Valves
Symbol
Cross Section
Cavity Details
150
VH065
Technical Features
All external surfaces are zinc plated and corrosion-proof.
All valve parts are made of high strength steel. Poppet is
hardened and ground to guarantee minimal wear and to ex-
tend service life. Adjustment screw cannot be backed out of
the valve. Positive stop prevents springs from going solid.
Optional spring ranges to 350 bar (5000 psi). Single piece
high durometer extrusion resistant polyurethane seal. Me-
tric 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 star-
ts to open to tank (2) throttling flow to minimize
the pressure rise. The innovative geometry of the
deflector provides in fact a very low rise rate, and
the poppet design guarantees great stability. The
cartridge offers quick response to load changes in
hydraulic circuits requiring low internal leakage as
well as limited hysteresis.
METRIC Cartridge - 350 bar
Direct acting - Poppet type
RVS4.M30 Valve Series
Description
151
Technical Data
Ordering Code
Performance Details
Maximum operating pressure 350 bar
Maximum flow 100 l/min
Setting Pressure 50 - 350 bar
Maximum internal leakage 1 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 80° C (special sealing polyurethane)
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
Orientation No restrictions
Installation torque 55-65 Nm (Hex. 32)
Tightening torque nut 25-30 Nm (Hex. 27)
See page 480
Oil testing condition ISO VG 46 cSt
Seal kit code SK.051
Weight 0,307 kg
Flow (l/min)
Pressure (bar)
Note: The performan-
ce chart illustrates flow
handling capacity at various
settings.
p/Q curves are recorded at
TOil = 40°C and 46 cSt.
