NZRDP
DESCRIPTION OF FUNCTION, SECTION
12
There is free flow from A1 to A2, while flow is blocked
in the other direction. When oil flows from B1 to B2,
build-up of pressure causes dual piston (2) to move. As
piston (2) is moved to left, pilot poppet (3) is pushed
from its seat. Oil can now flow from A2 to A1. In order
to ensure that the poppet valve seats properly, the
service ports of the directional valve should be connect-
ed to the return line in the neutral position.
Check valves type N-ZRDP06 are self-piloting check
valves in sandwich plate design. They ensure closure of
the service line with near-zero leakage, and therefore
block the effects of external forces on the actuator and
various leakages across the directional valve.
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
They comprise a
• housing (1)
• dual piston (2)
• pilot poppet (3) and a
• spring (4).
NZRDP
13
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
ORDERING INFORMATION
SYMBOLS AND PART NUMBERS
NG Q
max.
[l/min] DESIGNATION PART NUMBER
6 60 N-ZRDP06A4CC5S XEB16883-000N01
66
0 N-ZRDP06A4AB5S XEB17299-000N01
6 60 N-ZRDP06A4BA5S XEB17300-000N01
Subject to technical changes
NZRDP
TECHNICAL DATA
PERFORMANCE CURVES
14
General Data Value Unit Specifications
Designation - - Pilot operated check valve
Type designation - - see Ordering Information
Mode of construction - - Modular valve
Mounting pattern - - Size 03 (NG06) as per ISO 4401
Mounting dimensions - mm see Unit dimensions
Mounting position - - any
Flow max. Q
max.
l/min 60 (see performance curves)
Ambient temperature range
min. °C -25
max. °C +60
Working pressure
Inlet
min. bar 0
max. bar 315
Outlet
min. bar 0
max. bar 315
Fluid temperature range
min. °C -25
max. °C +80
Viscositiy range
min. mm
2
• s
-1
[cSt] 2,8
max. mm
2
• s
-1
[cSt] 380
Operational viscositiy ν mm
2
• s
-1
[cSt] 35
Weight m kg 1,2
Area ratio - - 1 : 6
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
NZRDP
INSTALLATION DRAWING N-ZRDP06A4__5S
15
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
N-ZRDP06A4AB5S
N-ZRDP06A4BA5S
N-ZRDP06A4CC5S
4 x O-Ring NBR 9,25x1,78 (Part number: X783-00288);
Seal kit, complete: XEB17587-000N00 (CC-Version)
XEB17589-000N00 (AB + BA-Version)