Relief Valves
Symbol
Cross Section
114
Cavity Details
VH039
METRIC Cartridge - 350 bar
Direct acting - Poppet type
RVY0.M18 Valve Series
Technical Features
Description
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 extend service
life. Adjustment screw cannot be backed out of the valve. Po-
sitive 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)
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
RVY0 in the standard conguration can be used in
crossover relief applications .
Technical Data
115
Specications may change without notice.
Ordering Code
Maximum operating pressure 350 bar
Maximum flow 80 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 20/18/15 ISO 4406 (maximum ltration admitted)
Orientation No restrictions
Installation torque 40-45 Nm (Hex. 19)
Tightening torque nut 25-30Nm (Hex. 19)
Technical specications for characterization See page 480
Oil testing condition ISO VG 46 cSt
Seal kit code SK.086
Plastic tamper proof cap CTP.001 (for more details see page 428-429)
Wire seals tamper proof Suitable design upon request
Weight 0,070 kg
Design Note
The nose of the valve protrudes
by 1,7 mm into ID 15 mm of the
cavity.
Relief Valves
Springs’ Graphs
1
2
p/Q performance
p/Q performance
116
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Spring = N (81 - 150 bar)
Spring = Y (20 - 80bar)
RVY0.M18 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
117
Flow (l/min)
Flow (l/min)
Pressure (bar)
Pressure (bar)
Specications may change without notice.
Spring = G (251 - 350bar)
Spring = B (151 - 250bar)
