Vickers | KDG3V32C34AS60
KDG3V32C34AS60
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The KDG3V32C34AS60 proportional valve belongs to the KDG Non-feedback Proportional Valves series and is built by Vickers. It modulates hydraulic flow in automation circuits without internal feedback to simplify control architectures. The valve is hydraulic pilot operated, so a pilot pressure shifts the spool instead of an electric actuator, which allows use in zones where electrical hardware is restricted. A closed center spool blocks all flow paths in the neutral position, keeping actuators isolated until a pilot signal is present. The spool is spring centered with a double operator arrangement that returns it to neutral when pilot pressure is removed, ensuring fail-safe centering. Meter-in only metering means the unit controls the inlet flow while letting return oil pass freely, a configuration suited to pressure-compensated systems. At 10 bar differential it passes 34 L/min (9 US gpm), allowing mid-range cylinder speeds in compact machines. Hysteresis is limited to 4 percent to minimize flow deviation between increasing and decreasing commands, while repeatability of 1 percent helps maintain consistent actuator performance during repetitive cycles.
The valve endures continuous service pressures of 350 bar (5075 psi), identical to its rated fatigue limit, so it can handle high-pressure circuits without life reduction. Tank lines may reach 210 bar (3045 psi), enabling use with back-pressure accumulators. The body weighs 1.2 kg (2.5 lb), permitting manual installation on small manifolds. It mounts to an ISO 4401-03 (NFPA D03) interface; mounting bolts must be tightened to 6 Nm (53 lb-in) to seal the ports. A surface flatness of 0.013 mm and a finish of 1.1 µm are required on the manifold face to avoid leakage paths. The pilot port is threaded 7/16-20 UNF-2B for connection to standard SAE hoses. These mechanical details, together with an identical maximum and fatigue pressure rating, confirm suitability for long duty cycles in industrial hydraulic automation.
Technical Specifications
Actuation Type
Hydraulic Pilot Operated
Approximate Weight
1.2 kg (2.5 lb)
Hysteresis
4%
Max Operating Pressure
350 bar (5075 psi)
Max Tank Line Pressure
210 bar (3045 psi)
Metering Configuration
Meter-In Only
Mounting Bolt Torque
6 Nm (53 lb-in)
Mounting Interface
ISO 4401-03 (NFPA D03)
Mounting Surface Finish
1.1 µm
Mounting Surface Flatness
0.013 mm
Pilot Port Thread
7/16-20 UNF-2B
Rated Fatigue Pressure
350 bar (5075 psi)
Rated Flow @ 10 Bar
34 L/min (9 USgpm)
Repeatability
1%
Spool Type
Closed Center
Spool/spring Arrangement
Spring Centered, Double Operator
1620 Old Apex Road
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