NACHI steel rolling mill quantitative piston Pump
NACHI Fixed Displacement Piston Pumps for Steel Rolling Mills
1. Product Overview
NACHI fixed displacement piston pumps are specifically engineered to meet the rigorous demands of steel rolling mill applications, delivering reliable hydraulic power with exceptional precision and efficiency. Designed with advanced piston mechanism technology, these pumps ensure consistent flow control and stable pressure output, which are critical for the smooth operation of rolling mill systems. Whether for hot rolling, cold rolling, or other rolling processes, NACHI fixed displacement piston pumps provide the robust performance required to handle heavy loads, high-pressure conditions, and continuous operation typical in the steel manufacturing industry <superscript>1.
Crafted from high-quality materials and manufactured through precision processing techniques, these pumps offer long-lasting durability and minimal maintenance requirements, reducing downtime and operational costs for steel mills. Their compact and lightweight design allows for flexible installation even in limited space environments, making them suitable for integration into various rolling mill hydraulic systems <superscript>5.
2. Core Features
2.1 Energy Efficiency
Equipped with NACHI’s proprietary semi-circular swash plate that bears pressure on its surface, the pumps ensure stable discharge volume at all times. This design eliminates excess discharge, enables effective power utilization according to load cycles, reduces power loss, and achieves energy savings. It contributes significantly to lowering hydraulic system costs for steel rolling mills <superscript>4.
2.2 Low Noise Operation
Proprietary low-noise mechanisms are integrated into key components such as shoes, swash plates, and valve plates. The semi-circular barrel swash plate stabilizes operational characteristics, further reducing noise levels. This quiet operation is particularly beneficial for improving the working environment in steel mills and complying with industrial noise regulations <superscript>1.
2.3 High Durability & Reliability
Strict material selection and advanced heat treatment processes, combined with NACHI’s precision machining technology, ensure the pumps’ high structural integrity. They can withstand the harsh operating conditions of steel rolling mills, including high pressure, heavy vibration, and continuous operation, delivering long service life and reliable performance <superscript>3.
2.4 Flexible Pressure Adjustment
The pumps offer multiple pressure adjustment ranges (2 to 21 MPa) to accommodate different operational requirements of steel rolling mills. Various control options are available, including manual, remote, 2-pressure, 2-flow rate, and solenoid control, providing flexibility for system configuration <superscript>1.
2.5 Easy Installation & Maintenance
Designed with simple installation procedures, the pumps can be connected using flexible couplings. Accessible components facilitate routine maintenance and inspections. The compact design (e.g., Design No. 30 for PVS-0B series) reduces size and weight, simplifying handling during installation and maintenance <superscript>1.
3. Technical Specifications
| Model No. | Volume (cm³/rev) | Discharge Volume at No-Load (ℓ/min) | Pressure Adjustment Range (MPa) | Permitted Peak Pressure (MPa) | Speed Range (min⁻¹) | Weight (kg) |
|---|---|---|---|---|---|---|
| PVS-0B-8 | 8.0 | 8.1 (1000min⁻¹), 9.6 (1200min⁻¹), 12.0 (1500min⁻¹), 14.4 (1800min⁻¹) | 2-3.5, 2-7, 3-14, 3-21 | 25 | 500-2000 | 7.7 |
| PVS-1B-16 | 16.5 | 16.5 (1000min⁻¹), 19.8 (1200min⁻¹), 24.7 (1500min⁻¹), 29.7 (1800min⁻¹) | 2-3.5, 2-7, 3-14, 3-21 | 25 | 500-2000 | 10.5 |
| PVS-1B-22 | 22.0 | 22.0 (1000min⁻¹), 26.4 (1200min⁻¹), 33.0 (1500min⁻¹), 39.6 (1800min⁻¹) | 2-3.5, 2-7, 3-14, 3-21 | 25 | 500-2000 | 10.5 |
| PVS-2B-35 | 35.0 | 35.0 (1000min⁻¹), 42.0 (1200min⁻¹), 52.5 (1500min⁻¹), 63.0 (1800min⁻¹) | 2-3.5, 2-7, 3-14, 3-21 | 25 | 500-2000 | 21.0 |
| PVS-2B-45 | 45.0 | 45.0 (1000min⁻¹), 54.0 (1200min⁻¹), 67.5 (1500min⁻¹), 81.0 (1800min⁻¹) | 2-3.5, 2-7, 3-14, 3-21 | 25 | 500-2000 | 21.0 |
4. Installation & Maintenance Guidelines
4.1 Installation Requirements
- The eccentricity between the drive shaft and the pump should be less than 0.05mm, and the angle error should be within 1°. Flexible couplings are recommended for connection <superscript>3.
- Ensure the pump shaft remains horizontal during installation. Avoid overloading the pump shaft with centripetal force when using belts, gears, or chains for transmission <superscript>3.
- The suction pressure should be set between -0.03 and +0.03 MPa (-0.3 to +0.3 kgf/cm²). For external drain type pumps, the drain pipe can be directly installed inside the oil tank below the oil level, with back pressure not exceeding 0.03 MPa (0.3 kgf/cm²) <superscript>3.
- The suction port should be connected above the horizontal position to maintain a certain oil volume inside the pump. Install an exhaust valve if air discharge is difficult during startup <superscript>3.
4.2 Maintenance Recommendations
- Use mineral-based hydraulic oil as the working fluid. For high-pressure operation or flame-retardant hydraulic oil, a filter with 25μm or finer filtration accuracy is required to prevent oil contamination, which can significantly affect the pump’s service life <superscript>3.
- Avoid knocking the pump shaft during coupling installation and removal; use special tools when disassembling <superscript>3.
- Regularly inspect key components such as seals, swash plates, and valve plates for wear or damage. Replace worn parts promptly to ensure optimal performance <superscript>1.
5. Application Advantages in Steel Rolling Mills
Steel rolling mills require hydraulic systems that can withstand high pressure, heavy loads, and continuous operation. NACHI fixed displacement piston pumps are ideally suited for these conditions due to their high peak pressure resistance (up to 25 MPa) and stable flow output <superscript>1. The precise flow control ensures accurate adjustment of rolling forces and speeds, improving the quality of rolled steel products.
The energy-saving design reduces power consumption, lowering the overall operational costs of the rolling mill. Additionally, the low-noise operation contributes to a better working environment, while the high durability and easy maintenance minimize downtime, ensuring continuous production. These pumps can be integrated into various rolling mill systems, including roughing mills, finishing mills, and coiling machines, providing reliable hydraulic power support for the entire steel rolling process <superscript>6.
