SC 18 Series Proportional Valves, Sectional Design
These sectional proportional valves regulate the flow rate to the actuator by means of an internal closed-loop control system. Load-independent flow control is guaranteed by individual pressure compensators upstream of each proportional direction valve (load-sensing principle). These features are accomplished via a compact sectional design, actuator modules with individual pressure compensators and optional pressure relief valve (primary or secondary), and load-independent flow control, even with parallel operation of several actuators.
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Specifications
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MECHANICAL
Design Proportional valves, sectional design, spool type - Port Type Threaded ports to DIN 3852 and DIN ISO 6162 SAE Flange Mounting Attitude Unrestricted Ensure good air-bleeding Actuator Size A / B with Threaded Ports: G 1" UNF Available A / B with SAE Flanged Ports: 3/4" 6,000 PSI - Pump Size P with Threaded Ports: G 1-1/4" UNF Available P with SAE Flanged Ports: 1" 6,000 PSI - Tank Size T with Threaded Ports: G 1-1/2" UNF Available T with SAE Flanged Ports: 1-1/4" 3,000 PSI - Load Sensing Size XL with Threaded Ports: G 1/4" UNF Available XL with SAE Flanged Ports: G 1/4" - Pump for Pilot Stage Size X with Threaded Ports: G 1/4" UNF Available X with SAE Flanged Ports: G 1/4" - Tank for Pilot Stage Size Y with Threaded Ports: G 1/4" UNF Available Y with SAE Flanged Ports: G 1/4" - Test Point for Pump Pressure Size MP with Threaded Ports: G 1/4" UNF Available MP with SAE Flanged Ports: G 1/4" - Test Point for Tank Pressure Size MT with Threaded Ports: G 3/4" UNF Available MT with SAE Flanged Ports: G 3/4" - ENVIRONMENTAL
Ambient Temperature Range -30°C + 60°C - HYDRAULIC
Hydraulic Fluid HL and HLP mineral oil to DIN 51524 For other fluids, please consult Bucher. Hydraulic Fluid Temperature Range -20°C to +80°C +20°C to +60°C recommended Viscosity Range 10 to 500 mm²/s (cSt) 15 to 250 mm²/s (cSt) recommended Minimum Fluid Cleanliness Class 20/18/15 Cleanliness Class to ISO 4406 : 1999 Maximum Inlet Flow Rate 400 l/min - Maximum Actuator Flow Rate 260 l/min - Maximum Pump Pressure 370 bar - Maximum Load Pressure 420 bar - Maximum Tank Pressure 50 bar Port T Maximum Tank Pressure for Electrohydraulic Pilot Stage 5 bar Port Y or T Pilot-Pressure Range 6 to 20 bar - Pressure Rating of Pilot Circuit maximum 50 bar - ELECTRICAL
Control Current at Opening Point 24 V: 350 mA - 12 V: 700 mA - Control Current at Maximum Stroke 24 V: 700 mA - 12 V: 1,400 mA - Hysteresis with 100 Hz PWM Signal ± 3% From control current at maximum stroke Protection Class to EN 60 529 IP 65 - Insulation Class to VDE 0580 H - Supply Voltage 24 / 12 V DC - Coil Resistances at 20°C 24 V: 21.2 ±5% Ω - 12 V: 5.3 ±5% Ω - Coil Resistances at 60°C 24 V: 24.5 ±5% Ω - 12 V: 6.1 ±5% Ω - Power Consumption at Maximum Spool Stroke 10.4 VA Coil resistance at 60°C Maximum Current for 100% Relative Duty Cycle 24 V: 750 mA - 12 V: 1,500 mA - -
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