Relief Valves
Symbol
Cross Section
142
METRIC Cartridge - 350 bar
Direct acting - Poppet type
RVC3.M20 Valve Series
Technical Features
Description
All external surfaces are zinc plated and corrosion-proof. All val-
ve parts are made of high strength steel. Poppet is hardened
and ground to guarantee minimal wear and to extend 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 resi-
stant polyurethane seal. 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 transien-
ts. When the pressure at the Inlet (1) reaches the valve
setting, the valve starts 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 hystere-
used in crossover relief applications.
VH069
Cavity Details
Technical Data
143
Maximum operating pressure 350 bar
Maximum flow 40 l/min
Setting Pressure See table below
Maximum internal leakage 0,25 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 27-30 Nm (Hex. 24)
Tightening torque nut 25-30 Nm (Hex. 19)
See page 480
Oil testing condition ISO VG 46 cSt
Seal kit code SK.075
Plastic tamper proof cap CTP:001 (for more details see page 428-429)
Weight 0,170 kg
The nose of the valve protrudes
by 6,2 mm into ID 11,5 mm
of the cavity.
Ordering Code
Design Note
Relief Valves
Springs’ Graphs
1
2
p/Q performance
p/Q performance
144
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Spring = Y (15 - 60bar)
Spring = N (25 - 135bar)
RVC3.M20 Valve Series
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
p/Q performance
p/Q performance
3
4
145
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Spring = G (120 - 350bar)
Spring = B (50 - 220bar)
