Relief Valves
Symbol
Cross Section
126
Hybrid SAE Cartridge - 350 bar
Direct acting - Poppet type
RVC0.S09 Valve Series
SAE09
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). Industry commonly used hybrid cavity
“SAE09”.
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)
throttling flow to minimize the pressure rise. The in-
novative 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 inter-
nal leakage as well as limited hysteresis. NOTE: the
crossover relief applications.
Cavity Details
Technical Data
127
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 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
Orientation No restrictions
Installation torque 40-45 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.002
Plastic tamper proof cap CTP.001 (for more details see page 428-429)
Weight 0,150 kg
The nose of the valve protrudes
by 3 mm into ID 10 mm of the
cavity.
Ordering Code
Design Note
Relief Valves
Springs’ Graphs
1
2
p/Q performance
p/Q performance
128
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Spring = N (25 - 135bar)
Spring = Y (15 - 60bar)
RVC0.S09 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
129
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Spring = G (120 - 350bar)
Spring = B (50 - 220bar)
