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VDC-12A(B)-1A5-1A*20/35 Nachi Double vane Pump
VDC Series:VDC-1A/B; VDC-2A/B; VDC-3A/B
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Description
Nachi Double Vane Pump VDC-12A-1A5-1A*20/35 & VDC-12B-1A5-1A*20/35 Specifications
Nachi VDC-12A-1A5-1A*20/35 and VDC-12B-1A5-1A*20/35 are high-performance double vane pumps (twin vane pumps) designed for industrial hydraulic systems, integrating two vane pump units into one compact structure. Featured with stable operation, wide pressure adjustment range, low noise and space-saving design, these pumps are ideal for hydraulic systems requiring dual-path and stable hydraulic power output with flexible pressure demand. This document provides detailed technical parameters, model interpretation, key features and application scope, helping users quickly understand, select and apply the product. Suitable for machinery, automation, engineering equipment, plastic machinery and other fields requiring reliable dual-path hydraulic power with flexible high pressure and stable flow demand.
Model Interpretation
The model codes of Nachi VDC series double vane pumps have clear and standardized meanings, which can help users quickly identify product specifications and avoid selection errors:
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VDC: Series name, representing Nachi high-pressure variable displacement vane pump, widely used in industrial high-pressure hydraulic systems.
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12: Double pump identifier, indicating that the product is a twin (double) vane pump, integrating two independent vane pump units with optimized structure, which has higher flow stability and pressure-bearing capacity compared with the VDC-11 series double vane pump.
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A/B: Mounting method (A: Foot type mounting, sub plate type, sub plate not included; B: Flange mounting optional, suitable for different installation space and application scenarios).
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1: Pump size, indicating the basic structural size of each single vane pump unit in the double pump (matched with the VDC-1 series single pump size, optimized for flexible pressure adaptation and stable operation).
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A: Ring size, corresponding to the matching size of the pump ring, ensuring stable operation and pressure resistance of the pump under wide pressure and medium-flow working conditions.
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5: Pressure adjustment range, corresponding to the wide high-pressure regulation specification for the VDC-12 series double vane pump, suitable for medium and high-pressure hydraulic system requirements with flexible pressure adjustment demand.
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1A: Flow characteristics, meaning constant discharge type for dual pump units, ensuring stable and consistent flow output of each independent pump unit, perfectly matching the working demand of dual-path hydraulic systems that require independent operation and stable power supply.
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*20/35: Design and matching code, 20 represents the basic design number of the pump, 35 represents the matching specification of the pressure control component, ensuring the pump’s pressure stability and control precision under wide pressure and medium-flow conditions.
Detailed Technical Parameters
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Parameter Item
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Nachi VDC-12A-1A5-1A*20/35
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Nachi VDC-12B-1A5-1A*20/35
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Displacement per unit (in³/rev)
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1.8 (each pump unit)
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1.8 (each pump unit)
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Total Displacement (in³/rev)
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3.6 (two pump units combined)
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3.6 (two pump units combined)
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No-Load Discharge Rate (gpm) @ 1500 min⁻¹ (per unit)
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12.0
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12.0
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Total No-Load Discharge Rate (gpm) @ 1500 min⁻¹
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24.0
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24.0
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No-Load Discharge Rate (gpm) @ 1800 min⁻¹ (per unit)
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14.4
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14.4
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Total No-Load Discharge Rate (gpm) @ 1800 min⁻¹
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28.8
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28.8
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Pressure Adjustment Range (psi)
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290 – 2100
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290 – 2100
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Pressure Adjustment Range (kgf/cm²)
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20.4 – 148.6
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20.4 – 148.6
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Allowable Peak Pressure (psi)
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3000
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3000
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Allowable Peak Pressure (kgf/cm²)
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214.3
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214.3
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Shaft Speed Range (min⁻¹)
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800 – 1800
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800 – 1800
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Weight (lbs)
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105
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108
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Weight (kg)
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47.6
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49.0
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Mounting Method
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Foot type mounting (Sub plate type, sub plate not included)
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Flange mounting optional
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Flow Characteristics
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Constant discharge type (each unit independent output)
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Constant discharge type (each unit independent output)
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Design Number
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20
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20
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Rotation Direction
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Right from shaft end (both units synchronous rotation)
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Right from shaft end (both units synchronous rotation)
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Material
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High-strength reinforced cast iron (enhanced for double pump pressure-bearing, wear resistance and wide pressure adaptability)
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High-strength reinforced cast iron (enhanced for double pump pressure-bearing, wear resistance and wide pressure adaptability)
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Pressure Control Precision
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±0.3MPa (excellent level), pressure fluctuation ≤0.1MPa
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±0.3MPa (excellent level), pressure fluctuation ≤0.1MPa
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Operation Noise (dB @ 1m)
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≤55dB, low noise design
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≤55dB, low noise design
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Key Features
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Dual-Path Independent Hydraulic Output: Integrates two independent vane pump units with optimized structure, providing stable dual-path hydraulic power output that can be used independently or in combination. The constant discharge type (1A) ensures stable flow output of each unit, perfectly adapting to the working demand of dual-path hydraulic systems that require independent operation, and saving installation space compared with two single pumps.
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Wide Pressure Range & High Stability: With allowable peak pressure up to 3000 psi (214.3 kgf/cm²) and wide pressure adjustment range of 290-2100 psi, equipped with high-precision pressure control components (matching code 35), pressure control precision reaches ±0.3MPa, pressure fluctuation ≤0.1MPa. Optimized small pump size and structure enhance pressure adaptability, suitable for medium and high-pressure systems with flexible pressure demand.
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Stable & Quiet Operation: Adopts 3-point ring support system and optimized structural design, combined with precision machining and noise reduction technology, operation noise is ≤55dB (1m distance), minimizing vibration and noise, suitable for precision machinery and indoor working scenarios.
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High Efficiency & Durability: Innovative mechanical design reduces power loss and improves overall system efficiency; high-strength reinforced cast iron material (enhanced for wide pressure and medium-flow working conditions) enhances pressure-bearing capacity and wear resistance, ensuring long service life even under long-term continuous operation of double pump units.
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Easy Installation & Maintenance: Compact integrated structure, foot/flange optional mounting methods, adapting to different installation spaces; pressure and flow adjustment mechanisms of the two pump units are concentrated on the same side, simplifying maintenance and handling, reducing equipment downtime.
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Strong Adaptability: Wide shaft speed range (800-1800 min⁻¹), suitable for different power matching requirements; constant discharge type design ensures stable and consistent flow output of each pump unit, adapting to various industrial hydraulic system scenarios that require dual-path independent power supply with flexible pressure demand.
Application Scope
Nachi VDC-12A-1A5-1A*20/35 and VDC-12B-1A5-1A*20/35 double vane pumps are widely used in various industrial fields requiring dual-path high-pressure, wide pressure range and stable flow hydraulic power, including large-scale injection molding machines, heavy-duty hydraulic presses, engineering construction machinery, high-precision automated production lines, plastic machinery, metallurgical equipment, and complex hydraulic systems that need independent dual-path power supply with flexible pressure adjustment. With compact structure, stable dual-path independent output, wide pressure range, high pressure resistance and low noise, they are an ideal choice for medium and high-pressure dual-path hydraulic systems with strict requirements on space, efficiency and stability.
Note
1. The parameters are standard values; actual performance may vary slightly according to the working environment, hydraulic oil quality and operating conditions.
2. It is recommended to use hydraulic oil that meets Nachi’s high-pressure specifications, and control the oil temperature within the range of -10℃ to +70℃ to ensure the service life and performance of the pump, avoiding damage caused by inappropriate oil quality, viscosity or impurity content.
3. The two pump units adopt synchronous rotation design; do not adjust the rotation direction arbitrarily to avoid mechanical failure. For more detailed installation, debugging and maintenance guidelines, please refer to the official Nachi VDC series double vane pump product manual.
4. The pump is equipped with pressure control components matching code 35, which can be adjusted according to the actual system pressure requirements within the range of 290-2100 psi, and it is not recommended to exceed the allowable peak pressure for long-term operation.
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