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Parker Series ZNS Counterbalance Valve
The proven counterbalance valve series ZNS in size NG06 (CETOP 03) and NG10 (CETOP 05) enables a reliable operation by controlling the actuator movement at overrunning loads.
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Parker counterbalance valves series ZNS in sandwich design control the actuator movement at overrunning loads via a leak-free poppet valve. Thereby they enable a reliable operation and a linear lowering speed of the cylinder.
The return flow from the actuator is piloted and controlled by the inlet flow to the actuator, ensuring a cavitation-free lowering of the load. The counter balance valve operates as a pressure relief valve. The setting pressure is lowered by the pressure in the inlet line.
Markets:
• Industrial
• Machine tools
Benefits:
• Compact, proven design that represents our long-term experience in hydraulics
• Controlled movement loads – prevents cavitation
• Load holding via leak-free poppet valve – ensures reliable operation
• Short delivery time – no warehousing necessary
• Available in two sizes:
– ZNS*01 – NG06 (CETOP 03)
– ZNS*02 – NG10 (CETOP 05)
• Secondary relief protection for the actuator
Applications:
• Suitable for general hydraulic applications
• Machine tools
Technical Specifications
| Adjustment Mechanism | Hexagon screw with lock nut |
| Mounting Type | Sandwich plate |
| Operation Type | Pilot |
| Product Series | Counterbalance valve |
| Maximum Operating Pressure | 315, 350 bar |
| Flow Rate | 60, 120 L/min |
| Maximum Flow Rate | N/A |
| Maximum Operating Temperature | 60 L/min |
| Minimum Operating Temperature | -20 L/min |
| Seal Material | NBR, FPM |
| Configuration | N/A |
| For Fluid Type | Hydraulic oil according to DIN 51524, Water glycol |
| Function | Load holding |
| Body Material | Steel |
| Pressure Control Range | N/A |
| Maximum Pressure Setting | 70 – 175, 140 – 350 bar |
| Actuation Type | Oil Pilot |
Parker Series ZNS Counterbalance Valve Service Manual
Parker Series ZNS Counterbalance Valve Service Manual
