Denison Sandwich.indd, dd
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio, USA
Sandwich Valves
Catalog HY14-2500/US
B49
B
B
Technical Information Series ZNS
Ordering Information
General Description
Series ZNS counterbalance valve controls the actuator
movement at overrunning loads.
The return flow from the actuator is piloted and con-
trolled by the inlet flow to the actuator, ensuring a
cavitation-free lowering of the load.
The counterbalance valve operates as a pressure relief
valve. The setting pressure is lowered by the pressure
in the inlet line. To ensure safe load holding the setting
pressure should be approximately 30% higher than the
max. load pressure.
Features
•
Controlled movement loads.
•
Load holding via leak-free poppet valve.
•
Secondary relief protection for the actuator.
•
Sizes:
ZNS*01 – NFPA D03 / NG6 / CETOP 3
ZNS*02 – NFPA D05 / NG10 / CETOP 5
ZNS-AB01
ZNS-B01
ZNS-B01
ZNS01 ZNS02
Counterbalance
Valve
Port
Option
ZNS
Size Pressure
Range
Hexagon Screw
with Lock Nut
S0
Design
Series
D
Seal
Weight: 1 cartridge 2 cartridges
ZNS*01 1.3 kg (2.9 lbs.) 3.0 kg (6.6 lbs.)
ZNS*02 1.6 kg (3.5 lbs.) 3.9 kg (8.6 lbs.)
Code Description
01 NFPA D03 / NG6
02 NFPA D05 / NG10
Code Description
A in A
B in B
AB in A and B
Code Description
1 Nitrile
5 Fluorocarbon
Code Description
2 70 to 175 Bar (1015 to 2538 PSI)
5
1)
140 to 350 Bar (2030 to 5075 PSI)
1)
ZNS02 to 315 Bar (4568 PSI)
Denison Sandwich.indd, dd
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio, USA
Sandwich Valves
Catalog HY14-2500/US
B50
B
B
Series ZNSSpecifications
Specifications
General
Size NG6 NG10
Mounting Interface
DIN 24340 A6
ISO 4401
NFPA D03
DIN 24340 A10
ISO 4401
NFPA D05
Mounting Position
Unrestricted
Ambient Temperature Range
-20°C to +50°C (-4°F to +122°F)
Hydraulic
Maximum Operating Pressure
350 Bar (5075 PSI) 315 Bar (4568 PSI)
Pressure Range
175 Bar (2538 PSI), 350 Bar (5075 PSI)
Pilot Ratio
4.5 : 1
Leakage
On request
Nominal Flow
60 LPM (15.9 GPM) 120 LPM (31.7 GPM)
Opening Pressure
0.3 LPM (0.1 GPM) 0.3 LPM (0.1 GPM)
Fluid
Hydraulic oil as per DIN 51524 ... 51525
Fluid Temperature
-20°C to +80°C (-4°F to +176°F)
Viscosity Permitted
Recommended
10 to 650 cSt / mm
2
/s (46 to 3013 SSU)
30 cSt / mm
2
/s (139 SSU)
Filtration
ISO Class 4406 (1999) 18/16/13 (acc. NAS 1638: 7)
Denison Sandwich.indd, dd
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio, USA
Sandwich Valves
Catalog HY14-2500/US
B51
B
B
Performance Curves Series ZNS
ZNS01
ZNS02
All characteristic curves measured with HLP46 at 50°C (122°F).
Denison Sandwich.indd, dd
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio, USA
Sandwich Valves
Catalog HY14-2500/US
B52
B
B
Dimensions Series ZNS
ZNS01 – Inch equivalents for millimeter dimensions are shown in (**)
ZNS02 – Inch equivalents for millimeter dimensions are shown in (**)
Seal Kit
Seal Order Code
1 098-91153-0
5 098-91154-0
Complete Cartridge
Seal Order Code
1 517-01017-2
5 517-00448-8
Seal Kit
Seal Order Code
1 098-91155-0
5 098-91183-0
Complete Cartridge
Seal Order Code
1 517-00449-8
5 517-00450-8
