NZRDP
DESCRIPTION OF FUNCTION, SECTION
36
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
connected to the return line in the neutral position.
Check valves type N-ZRDP10 are self-piloting check
valves in sandwich plate design. They ensure closure of
the service line with near-zero leakage, and therefor
e
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
37
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
ORDERING INFORMATION
SYMBOLS AND PART NUMBERS
NG Q
max.
[l/min] DESIGNATION PART NUMBER
10 120 N-ZRDP10A4CC5T
XEB16888-000N01
10 120 N-ZRDP10A4AB5T XEB16887-000N01
10 120 N-ZRDP10A4BA5T XEB16886-000N01
Subject to technical changes
NZRDP
TECHNICAL DATA
PERFORMANCE CURVES
38
General Data Value Unit Specifications
Designation - - Pilot operated check valve
Type designation - - see Ordering Information
Mode of construction
- - Modular valve
Mounting pattern - - Size 05 (NG10) as per ISO 4401
Mounting dimensions - mm see Unit dimensions
Mounting position - - any
Flow max. Q
max.
l/min 120 (siehe 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 3,1
Area ratio - - 1 : 6
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
NZRDP
INSTALLATION DRAWING N-ZRDP10A4__5T
39
MODULAR VALVES
PILOT OPERATED
CHECK VALVES
5 x O-Ring NBR 12,42x1,78 (Part number: X783-00288);
Seal kit, complete: XEB17587-000N00 (CC version)
XEB17589-000N00 (AB + BA version)