Pilot Check Valves
Description
Symbol
Cross Section
Cavity Details
78
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 to extend service
life. Pilot piston is hardened and ground, sealed
to prevent leakage. Single-piece, high durometer,
extrusion resistant seals. Optional bias springs for
back-pressure application flexibility. Metric cavity.
Cartridge style, normally closed, single pilot
check valve. Cartridge is closed until sufcient
pressure is applied on port 1 to reach the bias
spring setting, lift the poppet and allow free
flow to 2. The valve is normally closed from
2 to 1. When sufcent pressure is applied on
port 3, the pilot piston lifts the poppet from its
seat and allows flow from 2 to 1.
Very limited leakage in the check condition.
VH122
METRIC Cartridge - 420 bar
Direct acting check valve
Pilot piston to open
SPC4.M33 Valve Series
Technical Data
Performance Details
Flow (l/min)
Pressure (bar)
79
Specications may change without notice.
Ordering Code
Note: The performance
chart
illustrates flow handling
capacity. p/Q curves are
recorded at TOil = 40°C
and 46 cSt
Maximum operating pressure 420 bar
Maximum flow 100 l/min
Maximum Internal Leakage
0,10 cm
3
/ min @ 10 bar
0,10 cm
3
/ min @ 420 bar
External component treatment
Zn/Fe - standard (96h)
Zn/Ni (720h)
Pilot ratio 2,8:1
O-ring Temperature Range -30° C to 110° C (standard sealing NBR - BUNA-N)
Oil Temperature Range -30° C to 110° C
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 150-160 Nm
Technical Specications for characterization see page 480
Oil testing condition ISO VG 46 cSt
Seal kit code SK.067
Weight 0,338 kg
